NU566 Midterm Review

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Purdue University Globle 

NU566 NP I – Introduction to Primary Care for the Nurse Practitioner

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Date

Neurological Disorders Review for Clinical Practice

Early recognition of neurological disorders improves patient outcomes and reduces the risk of long-term complications. Conditions such as stroke, dementia, delirium, multiple sclerosis, Parkinson’s disease, seizures, and central nervous system infections often present with characteristic symptoms that help guide diagnosis and treatment. Understanding these hallmark features enables healthcare providers to differentiate between similar disorders, initiate timely interventions, and provide evidence-based patient care.

Understanding Cognitive Disorders in Older Adults

Older adults frequently experience neurological changes that require careful evaluation. Although some symptoms may appear similar, distinguishing between normal aging, dementia, delirium, and medication-related cognitive impairment is essential for accurate diagnosis and treatment.

Polypharmacy and Confusion in Older Adults

Polypharmacy, commonly defined as the use of five or more medications, is one of the leading reversible causes of confusion in older adults. Age-related changes in drug metabolism increase the risk of adverse drug reactions, drug interactions, and cognitive impairment. Healthcare providers should routinely review medication lists to identify unnecessary or potentially inappropriate medications.

Older adults experiencing new confusion should always undergo a comprehensive medication review before assuming the symptoms are related to dementia.

Dementia and Its Hallmark Features

Dementia is a progressive neurocognitive disorder characterized by a gradual decline in memory, language, reasoning, and executive functioning. One of the earliest language-related symptoms is difficulty finding the correct words during conversation, known as anomia.

Common clinical features include:

• Progressive memory loss

• Difficulty finding words

• Impaired judgment

• Difficulty learning new information

• Cognitive decline that interferes with daily activities

Unlike delirium, dementia develops gradually over months or years and is generally irreversible.

Alzheimer’s Disease

Alzheimer’s disease is the most common cause of dementia. Early stages primarily affect the ability to retain new information because the hippocampus is among the first brain regions affected.

Patients commonly experience:

• Short-term memory impairment

• Difficulty learning new information

• Progressive cognitive decline

• Changes in personality and behavior

• Reduced ability to perform activities of daily living

Cholinesterase inhibitors remain standard pharmacologic therapy for mild to moderate Alzheimer’s disease because they temporarily improve cognitive function by increasing acetylcholine levels within the brain.

Individuals with Down syndrome have a significantly increased risk of developing Alzheimer’s disease at a younger age due to the extra copy of chromosome 21, which contains the amyloid precursor protein (APP) gene.

Mini-Mental State Examination (MMSE)

The Mini-Mental State Examination (MMSE) is a widely used 30-point screening tool that evaluates cognitive impairment.

The assessment measures:

• Orientation

• Registration

• Attention

• Recall

• Language

• Visuospatial ability

Although useful for screening and monitoring progression, the MMSE alone does not diagnose dementia.

Delirium: A Medical Emergency

Delirium is an acute disturbance in attention and awareness that develops over hours to days. Unlike dementia, delirium typically fluctuates throughout the day and is often reversible when the underlying cause is treated.

Key characteristics include:

• Sudden onset

• Inattention

• Altered sleep-wake cycle

• Fluctuating mental status

• Disorganized thinking

Chronic kidney disease, infections, metabolic abnormalities, medications, dehydration, and hospitalization are common causes of delirium in older adults.

Prompt identification is critical because untreated delirium is associated with increased mortality.

Stroke Recognition and Emergency Management

Stroke is a neurological emergency caused by interrupted cerebral blood flow. Rapid recognition and treatment significantly improve neurological recovery.

Immediate Response to Stroke Symptoms

Patients experiencing symptoms such as facial drooping, arm weakness, speech difficulty, or sudden vision loss should immediately call 911 or emergency medical services. Delaying treatment by contacting a healthcare provider instead of emergency services can result in permanent neurological damage.

Head CT Before Thrombolytic Therapy

A non-contrast CT scan of the head must be performed before administering intravenous thrombolytic therapy (tPA). The scan differentiates ischemic stroke from hemorrhagic stroke because thrombolytic therapy is contraindicated in intracranial bleeding.

Thrombolytic Therapy Time Window

Intravenous thrombolytic therapy provides the greatest benefit when administered within 3 hours of symptom onset for eligible patients, although selected patients may qualify for extended treatment windows based on current clinical guidelines.

Rapid assessment remains essential because “time is brain.”

Carotid Artery Disease

A carotid bruit may indicate carotid artery stenosis caused by atherosclerosis. Patients with symptomatic carotid stenosis greater than 50% may benefit from carotid endarterectomy to reduce future stroke risk.

Head Trauma and Intracranial Hemorrhage

Traumatic brain injuries require rapid identification because different hemorrhage types have distinct clinical implications.

Subdural Hematoma

Subdural hematomas usually occur after head trauma due to tearing of bridging veins.

Common characteristics include:

• Slower symptom onset

• More common in older adults

• Often associated with falls

• Progressive neurological deterioration

Epidural Hematoma

Epidural hematomas typically result from rupture of the middle meningeal artery following temporal bone trauma.

Classic findings include:

• Brief loss of consciousness

• Lucid interval

• Rapid neurological decline

• Medical emergency requiring immediate intervention

Headache Disorders

Headaches are among the most common neurological complaints encountered in clinical practice. Most primary headaches are benign, but recognizing characteristic patterns improves diagnostic accuracy.

Migraine Headaches

Migraines commonly present with:

• Unilateral throbbing pain

• Nausea

• Vomiting

• Photophobia

• Phonophobia

Known migraine triggers include:

• Red wine

• Stress

• Sleep deprivation

• Hormonal changes

• Certain foods

Light sensitivity (photophobia) is one of the hallmark symptoms.

Cluster Headaches

Cluster headaches typically affect middle-aged men and often awaken patients from sleep.

Characteristics include:

• Severe unilateral orbital pain

• Tearing

• Nasal congestion

• Restlessness

• Recurrent attacks

High-flow oxygen therapy is considered one of the most effective acute treatments.

Seizure Disorders

Accurate seizure classification guides diagnosis and treatment.

Absence Seizures

Absence seizures present as:

• Brief blank stare

• Sudden interruption of activity

• No postictal confusion

• Last only a few seconds

They are most common in children but may occur at any age.

Driving After a Seizure

Patients diagnosed with seizures should follow state-specific driving restrictions. Driving privileges generally require a seizure-free period determined by local regulations and physician evaluation.

Multiple Sclerosis

Multiple sclerosis (MS) is a chronic autoimmune disease characterized by inflammation and demyelination within the central nervous system.

Clinical Presentation

MS most commonly affects women between 20 and 40 years of age.

Symptoms vary depending on lesion location and may include:

• Vision changes

• Muscle weakness

• Sensory disturbances

• Fatigue

• Balance problems

Diagnosis

There is no single definitive diagnostic test for multiple sclerosis. Diagnosis relies on a combination of:

• Clinical findings

• MRI evidence of demyelinating lesions

• Cerebrospinal fluid analysis

• Evoked potential studies

Relapsing-Remitting Multiple Sclerosis

Relapsing-remitting MS is the most common disease subtype and is characterized by episodes of neurological dysfunction followed by periods of partial or complete recovery.

Acute Treatment

Acute MS exacerbations are commonly treated with high-dose intravenous methylprednisolone (Solu-Medrol), which reduces inflammation and shortens relapse duration.

Disease-modifying monoclonal antibody therapies may be prescribed for long-term disease control in selected patients.

Parkinson Disease

Parkinson disease is a progressive neurodegenerative disorder resulting from dopamine deficiency within the basal ganglia.

Cardinal Features

Classic motor symptoms include:

• Resting tremor

• Bradykinesia

• Rigidity

• Postural instability

Patients frequently develop:

• Cogwheel rigidity

• Freezing episodes

• Shuffling gait

• Balance impairment

Postural instability is particularly associated with Parkinson-plus syndromes.

Huntington Disease

Huntington disease is an inherited neurodegenerative disorder characterized by progressive cognitive decline and involuntary choreiform (“dance-like”) movements.

Additional symptoms include:

• Psychiatric changes

• Behavioral disturbances

• Progressive dementia

Myasthenia Gravis

Myasthenia gravis is an autoimmune neuromuscular disorder that causes fluctuating skeletal muscle weakness.

Patients commonly present with:

• Ptosis

• Diplopia

• Difficulty swallowing

• Fatigable muscle weakness

Symptoms typically worsen with activity and improve with rest.

Central Nervous System Infections

Prompt recognition of neurological infections reduces morbidity and mortality.

Aseptic Meningitis

Aseptic meningitis is usually viral in origin and often resolves without permanent complications.

Common symptoms include:

• Headache

• Neck stiffness

• Fever

• Photophobia

Supportive care is the primary treatment.

Bacterial Meningitis

Streptococcus pneumoniae remains one of the most common causes of bacterial meningitis in adults. Empiric therapy frequently includes third-generation cephalosporins while awaiting culture results.

Viral Encephalitis

Herpes simplex virus is the leading cause of sporadic viral encephalitis. Early treatment with intravenous acyclovir significantly improves survival and neurological outcomes.

Bell’s Palsy

Bell’s palsy is an acute facial nerve (cranial nerve VII) paralysis that causes unilateral facial weakness.

Most patients experience substantial recovery within 3 to 6 months, especially when corticosteroid therapy is initiated early.

Guillain-Barré Syndrome

Guillain-Barré syndrome is an acute autoimmune polyneuropathy characterized by ascending muscle weakness that may progress to respiratory failure.

Older adults often present with:

• Progressive symmetric weakness

• Reduced reflexes

• Tingling sensations

• Difficulty walking

Close respiratory monitoring is essential because rapid deterioration may occur.

Cranial Nerve Assessment

Cranial Nerve V (Trigeminal Nerve)

The trigeminal nerve is primarily responsible for:

• Mastication (chewing)

• Facial sensation

• Corneal reflex (sensory component)

Assessment of chewing strength helps evaluate trigeminal nerve function.

Functional Assessment in Neurology

Healthcare providers should evaluate a patient’s ability to perform functional activities, including discussing current events or recent news. This assessment provides valuable information regarding cognition, memory, judgment, and executive functioning while supporting early identification of neurological impairment.

Pulmonary Disorders Review for Clinical Practice

Pulmonary disorders are among the leading causes of morbidity and mortality worldwide. Accurate assessment of respiratory symptoms, timely diagnosis, and evidence-based management are essential for preventing complications and improving patient outcomes. Conditions such as chronic obstructive pulmonary disease (COPD), asthma, pneumonia, tuberculosis (TB), obstructive sleep apnea (OSA), lung cancer, and respiratory infections have distinct clinical presentations and treatment approaches that healthcare providers should recognize.

Evaluating Common Respiratory Symptoms

Respiratory complaints require a comprehensive history and physical examination because similar symptoms may have multiple underlying causes.

Chronic Cough

A chronic cough is defined as a cough lasting more than eight weeks. The most common causes include upper airway cough syndrome (postnasal drip), asthma, gastroesophageal reflux disease (GERD), chronic bronchitis, and medication side effects.

Healthcare providers should investigate the duration, associated symptoms, smoking history, medication use, and environmental exposures to determine the underlying cause.

Chronic Cough Associated with ACE Inhibitors

Angiotensin-converting enzyme (ACE) inhibitors, particularly captopril, may cause a persistent dry cough due to increased bradykinin levels. The cough typically resolves after discontinuing the medication and switching to an alternative antihypertensive, such as an angiotensin receptor blocker (ARB).

Anxiety-Related Dyspnea

Not all shortness of breath results from pulmonary disease. Anxiety and panic disorders may cause dyspnea despite normal cardiopulmonary findings. A careful clinical assessment helps distinguish psychogenic causes from life-threatening respiratory conditions.

Gastroesophageal Reflux Disease and Chronic Cough

GERD is a common non-respiratory cause of chronic cough. Acid reflux may irritate the upper airway, leading to coughing even in the absence of classic heartburn symptoms.

Upper Respiratory Disorders

Upper respiratory conditions are commonly encountered in primary care and usually respond well to conservative treatment.

Allergic Rhinitis

Allergic rhinitis develops following exposure to allergens such as pollen, dust mites, mold, or pet dander.

Common symptoms include:

• Sneezing

• Nasal congestion

• Runny nose

• Itchy eyes

• Postnasal drip

Short-term use of decongestants may relieve congestion, while intranasal corticosteroids and antihistamines remain first-line therapies for long-term symptom control.

Viral Respiratory Infections

Several viral infections present with similar respiratory symptoms, making laboratory confirmation valuable in selected cases.

Direct Fluorescent Antibody Testing

Direct fluorescent antibody (DFA) testing can rapidly identify certain respiratory viruses by detecting viral antigens in respiratory specimens. Although molecular PCR testing is now more commonly used, DFA remains useful in some clinical settings.

Influenza

Early antiviral treatment reduces symptom duration and complications in patients with influenza.

Oseltamivir (Tamiflu) is approved for treatment in infants as young as two weeks of age, making it an important option for young pediatric patients who develop influenza.

Community-Acquired and Hospital-Acquired Pneumonia

Pneumonia remains a major cause of hospitalization and death, particularly among older adults and immunocompromised individuals.

Community-Acquired Pneumonia

Community-acquired pneumonia (CAP) most commonly results from Streptococcus pneumoniae infection.

Patients typically present with:

• Fever

• Productive cough

• Chest pain

• Dyspnea

• Crackles on lung auscultation

Empiric antibiotic selection depends on patient age, comorbidities, and disease severity.

Hospital-Acquired (Nosocomial) Pneumonia

Hospital-acquired pneumonia develops 48 hours or more after hospitalization and is frequently caused by gram-negative bacteria or methicillin-resistant Staphylococcus aureus (MRSA).

Because resistant organisms are common, broad-spectrum antimicrobial therapy is often initiated while awaiting culture results.

CURB-65 Severity Score

The CURB-65 prediction tool assists clinicians in estimating mortality risk among patients with community-acquired pneumonia.

The score evaluates:

• Confusion

• Blood urea nitrogen level

• Respiratory rate

• Blood pressure

• Age 65 years or older

Higher scores indicate increased mortality risk and often warrant hospital admission.

Tuberculosis

Tuberculosis remains an important infectious disease worldwide, particularly among immunocompromised populations.

Interpreting the Tuberculin Skin Test

A tuberculin skin test is interpreted by measuring induration, not redness or erythema.

An induration of 5 mm is considered positive in high-risk individuals, including:

• People with HIV

• Recent contacts of active TB cases

• Organ transplant recipients

• Severely immunocompromised patients

Factors That Reduce TB Test Accuracy

Certain conditions may produce false-negative TB skin tests, including:

• Long-term corticosteroid therapy

• Severe burns

• Immunosuppression

• Advanced HIV infection

Tuberculosis Medications

Isoniazid (INH) remains a cornerstone of tuberculosis treatment.

Important patient education includes:

• Take medications on an empty stomach unless otherwise directed.

• Complete the full treatment course.

• Report symptoms of hepatitis immediately.

• Avoid alcohol during therapy.

Pyridoxine Supplementation

INH may cause peripheral neuropathy by interfering with vitamin B6 metabolism. Pyridoxine (vitamin B6) supplementation helps prevent this complication, particularly in high-risk patients.

Asthma

Asthma is a chronic inflammatory airway disease characterized by reversible airflow obstruction and bronchial hyperresponsiveness.

Clinical Features

Patients commonly experience:

• Wheezing

• Chest tightness

• Cough

• Episodic shortness of breath

Unlike COPD, airway obstruction in asthma is generally reversible with appropriate treatment.

Moderate Persistent Asthma

Moderate persistent asthma is characterized by:

• Daily symptoms

• Nighttime symptoms more than once weekly

• FEV₁ between 60% and 80% of predicted

• Increased use of rescue inhalers

These patients typically require both controller and rescue medications.

Long-Acting Beta₂-Agonists

Long-acting beta₂-agonists (LABAs) should never be used as monotherapy in asthma because they increase the risk of severe exacerbations. Instead, they should always be combined with inhaled corticosteroids.

Short-Acting Beta₂-Agonists

Albuterol (Ventolin) provides rapid bronchodilation for acute symptom relief. Although highly effective, it may produce side effects such as tachycardia, tremor, and palpitations, particularly in older adults.

Theophylline Monitoring

Theophylline has a narrow therapeutic index.

The recommended therapeutic serum concentration is 5–15 mcg/mL. Higher levels increase the risk of serious toxicity, including seizures and cardiac arrhythmias.

Chronic Obstructive Pulmonary Disease

COPD encompasses chronic bronchitis and emphysema and is characterized by persistent airflow limitation.

Chronic Bronchitis

Patients with chronic bronchitis commonly exhibit:

• Chronic productive cough

• Increased carbon dioxide levels

• Reduced oxygen levels

• Respiratory muscle weakness

• Progressive airflow limitation

These abnormalities contribute to chronic respiratory failure if left untreated.

Emphysema

Emphysema causes destruction of alveolar walls and air trapping, leading to lung hyperinflation.

Typical findings include:

• Barrel chest

• Decreased breath sounds

• Dyspnea

• Weight loss

• Reduced exercise tolerance

GOLD Stage 1 COPD

Stage 1 COPD is defined by an FEV₁ of 80% or greater of the predicted value after bronchodilator administration.

Alpha-1 Antitrypsin Deficiency

Alpha-1 antitrypsin deficiency is an inherited disorder that predisposes individuals to early-onset emphysema, particularly in non-smokers or younger patients with COPD. Serum alpha-1 antitrypsin testing should be considered when clinical suspicion is high.

Long-Term Oxygen Therapy

Patients with severe chronic hypoxemia benefit from supplemental oxygen for at least 15 hours per day, which has been shown to improve survival and quality of life.

Lung Cancer

Lung cancer remains the leading cause of cancer-related death worldwide.

Major Risk Factors

The strongest risk factor is cigarette smoking.

Other risk factors include:

• Secondhand smoke exposure

• Radon

• Asbestos

• Occupational carcinogens

• Family history

Smoking cessation remains the single most effective strategy for reducing lung cancer risk.

Common Types of Lung Cancer

Adenocarcinoma is the most common type of lung cancer among both smokers and non-smokers and occurs in both men and women.

Squamous cell carcinoma is strongly associated with long-term tobacco use.

TNM Staging System

The TNM staging system evaluates:

• T: Tumor size and local invasion

• N: Regional lymph node involvement

• M: Presence of distant metastasis

For example, T1N0M0 indicates a small tumor without lymph node involvement or distant metastasis.

Horner Syndrome

Apical lung tumors may compress sympathetic nerves and produce Horner syndrome, characterized by:

• Ptosis

• Miosis

• Anhidrosis

Recognition of this classic triad assists in early diagnosis.

Smoking Cessation

Smoking cessation substantially lowers the risk of cardiovascular disease, COPD progression, and multiple cancers.

Counseling Patients to Quit

Healthcare providers should encourage smoking cessation during every clinical encounter.

Individuals in the preparation stage of behavior change have decided to quit and may already have purchased nicotine replacement products or selected a quit date.

Varenicline Therapy

Varenicline (Chantix) is typically started one week before the planned quit date to improve long-term cessation success.

Nicotine Gum

Patients should use the “chew and park” technique by chewing the gum until a tingling sensation develops and then placing it between the cheek and gum to allow nicotine absorption.

Benefits After Smoking Cessation

Smoking cessation provides numerous health benefits, including:

• Improved taste and smell

• Better lung function

• Reduced cardiovascular risk

• Lower cancer risk

• Improved circulation

Obstructive Sleep Apnea

Obstructive sleep apnea is characterized by repeated upper airway obstruction during sleep.

Risk Factors

Major risk factors include:

• Obesity

• Male sex

• Large neck circumference

• Older age

• Craniofacial abnormalities

A neck circumference of 17 inches or greater in men is associated with increased OSA risk.

Continuous Positive Airway Pressure

Continuous positive airway pressure (CPAP) remains the gold standard treatment for moderate to severe OSA. Therapeutic pressures commonly range from 5 to 20 cm H₂O, depending on patient needs.

Surgical Referral

Patients who fail CPAP therapy or have anatomical airway obstruction may be referred to an otolaryngologist for procedures such as laser-assisted uvulopalatoplasty.

Cardiovascular Disorders Review for Clinical Practice

Cardiovascular disease remains one of the leading causes of morbidity and mortality worldwide. Early identification of hypertension, coronary artery disease, heart failure, peripheral vascular disease, arrhythmias, and lipid disorders allows clinicians to reduce complications such as myocardial infarction, stroke, and sudden cardiac death. Comprehensive assessment, evidence-based pharmacologic therapy, and lifestyle modifications form the foundation of cardiovascular management.

Understanding Hypertension

Hypertension is often called the “silent killer” because many individuals remain asymptomatic until complications develop. Long-term uncontrolled hypertension increases the risk of stroke, heart failure, kidney disease, myocardial infarction, and vision loss.

Age and Hypertension Risk

Although hypertension becomes more common with advancing age, it should not be considered a normal consequence of aging. Lifestyle factors such as obesity, poor diet, physical inactivity, and smoking significantly contribute to its development.

Research shows that adults who are normotensive at age 55 still have approximately a 90% lifetime risk of developing hypertension.

Proper Blood Pressure Measurement

Accurate blood pressure measurement is essential for diagnosis and treatment decisions.

Best practices include:

• Allow the patient to rest quietly for at least 5 minutes before measurement.

• Keep both feet flat on the floor.

• Support the patient’s arm at heart level.

• Use an appropriately sized cuff.

• The bladder should cover approximately 80% of the arm circumference in length and 40% in width.

Improper technique may result in falsely elevated or reduced readings.

Initial Management

Lifestyle modification is recommended for all patients with elevated blood pressure.

Recommended interventions include:

• Weight reduction

• Regular aerobic exercise

• Limiting dietary sodium

• Smoking cessation

• Moderating alcohol intake

• Following the DASH eating plan

Even modest weight loss can significantly reduce blood pressure.

First-Line Medications

For many patients with uncomplicated hypertension, thiazide diuretics such as hydrochlorothiazide (HCTZ) or chlorthalidone are recommended as first-line therapy.

Chlorthalidone has demonstrated excellent stroke prevention benefits in long-term studies.

Patients who recently experienced a myocardial infarction often benefit from an ACE inhibitor such as lisinopril, which improves survival and reduces adverse cardiac remodeling.

Follow-Up After Treatment Initiation

Patients started on antihypertensive therapy should generally be reassessed within one month. If blood pressure remains above target, clinicians should optimize the current regimen or add a second medication.

Lipid Disorders

Hyperlipidemia significantly contributes to atherosclerosis and cardiovascular disease.

Understanding HDL and LDL Cholesterol

High-density lipoprotein (HDL) helps remove cholesterol from arteries and transport it to the liver for elimination.

An HDL level greater than 60 mg/dL is considered cardioprotective.

Low-density lipoprotein (LDL) contributes to plaque formation and increases cardiovascular risk.

Lowering LDL cholesterol substantially reduces the risk of heart attack and stroke.

Statin Therapy

High-intensity statin therapy, such as atorvastatin 80 mg daily, can reduce LDL cholesterol by approximately 50% or more.

Patients with a history of myocardial infarction or established cardiovascular disease should generally receive high-intensity statin therapy unless contraindicated.

Coronary Artery Disease and Angina

Coronary artery disease results from progressive narrowing of the coronary arteries due to atherosclerosis.

Angina

Stable angina typically presents as:

• Diffuse chest discomfort

• Pressure or heaviness

• Pain precipitated by exertion

• Relief with rest or nitroglycerin

The discomfort may radiate to the jaw, shoulder, neck, or left arm.

Prinzmetal (Variant) Angina

Prinzmetal angina results from coronary artery vasospasm rather than fixed atherosclerotic obstruction.

Episodes frequently occur:

• At rest

• During the night

• In younger patients

• With transient ST-segment elevation

Calcium channel blockers and nitrates remain the primary treatments.

Nitroglycerin Therapy

Nitroglycerin provides rapid relief of ischemic chest pain through coronary vasodilation.

Emergency Referral

Patients whose chest pain persists after three doses of nitroglycerin administered five minutes apart should immediately call emergency medical services or proceed to the emergency department.

Persistent chest pain may indicate an acute myocardial infarction.

Storage

Once opened, nitroglycerin tablets generally remain effective for approximately six months if stored properly in their original dark glass container away from heat and moisture.

Acute Myocardial Infarction

Rapid restoration of coronary blood flow significantly improves survival.

Thrombolytic Therapy

When primary percutaneous coronary intervention is unavailable, thrombolytic therapy should ideally begin within 30 minutes of hospital arrival for eligible patients.

Treatment is most effective when initiated within 3 hours of symptom onset, although selected patients may still benefit within 12 hours.

Heart Failure

Heart failure occurs when the heart cannot pump sufficient blood to meet the body’s metabolic demands.

Common Symptoms

Patients frequently experience:

• Dyspnea

• Fatigue

• Exercise intolerance

• Peripheral edema

• Orthopnea

• Weight gain

Shortness of breath remains one of the earliest and most common symptoms.

Bilateral Lower Extremity Edema

Persistent bilateral leg swelling should prompt evaluation for heart failure, especially when accompanied by dyspnea, fatigue, or elevated jugular venous pressure.

B-Type Natriuretic Peptide (BNP)

BNP levels rise rapidly in response to ventricular stretch and volume overload.

Elevated BNP supports the diagnosis of heart failure, although results should always be interpreted within the overall clinical context.

Stage D Heart Failure

Stage D heart failure represents advanced disease with severe symptoms despite maximal medical therapy.

Many patients require:

• Specialized heart failure management

• Mechanical circulatory support

• Heart transplantation evaluation

• Palliative or hospice care

Peripheral Vascular Disease

Peripheral vascular disease (PVD) results from reduced arterial blood flow to the extremities.

Clinical Findings

Common signs include:

• Cool extremities

• Pale skin

• Thickened toenails

• Reduced pulses

• Intermittent claudication

• Delayed wound healing

Ankle-Brachial Index

The ankle-brachial index (ABI) compares ankle and brachial systolic blood pressures.

An ABI of 0.90 or less suggests peripheral arterial disease, whereas values above 0.90 are generally considered normal.

Venous Thromboembolism

Major surgery significantly increases the risk of deep vein thrombosis (DVT).

Preventive strategies include:

• Early ambulation

• Compression devices

• Pharmacologic anticoagulation when appropriate

Pulmonary Embolism

Pulmonary embolism should be suspected in patients with sudden dyspnea, chest pain, tachycardia, or unexplained hypoxemia.

A ventilation-perfusion (V/Q) scan remains useful when computed tomography pulmonary angiography cannot be performed.

Cardiac Arrhythmias

Accurate rhythm interpretation guides appropriate treatment and reduces complications.

Atrial Fibrillation

Atrial fibrillation is the most common sustained cardiac arrhythmia.

Patients frequently have associated conditions such as:

• Coronary artery disease

• Heart failure

• Hypertension

• Valvular heart disease

The major complication is thromboembolic stroke.

CHA₂DS₂-VASc Score

The CHA₂DS₂-VASc score estimates stroke risk in patients with atrial fibrillation.

The letter A represents Age, one of the strongest predictors of stroke risk.

Wolff-Parkinson-White Syndrome

Wolff-Parkinson-White syndrome is characterized by an accessory conduction pathway that produces:

• Short PR interval

• Delta wave

• Episodes of supraventricular tachycardia

Paroxysmal Supraventricular Tachycardia

Paroxysmal supraventricular tachycardia (PSVT) presents with sudden episodes of rapid heart rate originating above the ventricles.

Clinicians should be familiar with ECG interpretation, including accurate measurement of the PR interval.

Premature Ventricular Contractions

Premature ventricular contractions (PVCs) are common and often benign.

Treatment is generally reserved for patients who have:

• Frequent symptomatic PVCs

• Underlying structural heart disease

• Hemodynamic instability

• High PVC burden leading to cardiomyopathy

Mobitz Heart Block

Second-degree atrioventricular block includes:

• Mobitz Type I (Wenckebach)

• Mobitz Type II

Recognition of ECG patterns is essential because Mobitz Type II frequently requires permanent pacemaker placement.

Heart Sounds and Cardiac Examination

Physical examination remains an essential component of cardiovascular assessment.

S4 Heart Sound

An S4 heart sound commonly occurs with left ventricular hypertrophy and decreased ventricular compliance.

Jugular Venous Distention

Distended neck veins indicate elevated central venous pressure and may suggest:

• Heart failure

• Pulmonary hypertension

• Fluid overload

• Right-sided cardiac dysfunction

Valvular Heart Disease

Mitral Stenosis

Mitral stenosis most commonly develops following rheumatic fever and leads to obstruction of blood flow between the left atrium and left ventricle.

Symptoms include:

• Dyspnea

• Fatigue

• Palpitations

• Atrial fibrillation

Aortic Sclerosis

Aortic sclerosis produces a systolic ejection murmur without significant obstruction of blood flow. Regular monitoring is recommended because some patients eventually develop clinically significant aortic stenosis.

Prosthetic Heart Valves

Patients with certain prosthetic heart valves require antibiotic prophylaxis before specific dental procedures to reduce the risk of infective endocarditis.

Anticoagulation

Dabigatran

Dabigatran is a direct thrombin inhibitor used for stroke prevention in atrial fibrillation and treatment of venous thromboembolism.

Although reversal agents are now available, clinicians should still carefully assess bleeding risk before initiating therapy.

Direct Oral Anticoagulants

Direct oral anticoagulants (DOACs), including rivaroxaban and similar agents, provide effective anticoagulation without the routine INR monitoring required for warfarin.

Lifestyle Modifications for Cardiovascular Health

Long-term cardiovascular risk can be significantly reduced through healthy lifestyle choices.

Recommended interventions include:

• Maintaining a healthy body weight

• Exercising regularly

• Consuming a heart-healthy diet

• Controlling diabetes

• Stopping tobacco use

• Limiting alcohol consumption

• Managing stress effectively

These interventions complement pharmacologic therapy and substantially reduce cardiovascular morbidity and mortality.

Endocrine Disorders Review for Clinical Practice

Endocrine disorders affect multiple organ systems by disrupting hormone production, metabolism, and homeostasis. Early recognition of conditions such as diabetes mellitus, thyroid disorders, adrenal diseases, obesity, and gout allows healthcare providers to prevent complications through timely diagnosis, patient education, lifestyle modifications, and evidence-based pharmacologic management.

Diabetes Mellitus

Diabetes mellitus is a chronic metabolic disorder characterized by persistent hyperglycemia resulting from inadequate insulin secretion, insulin resistance, or both. Long-term glucose control is essential for preventing microvascular and macrovascular complications.

Diagnosing and Monitoring Diabetes

Hemoglobin A1C (HbA1c) reflects average blood glucose over the previous two to three months and is commonly used to monitor long-term glycemic control.

For many nonpregnant adults:

• An HbA1c goal of less than 7% is recommended.

• If HbA1c remains above 7%, treatment should include lifestyle modification and pharmacologic therapy, commonly beginning with metformin, unless contraindicated.

An oral glucose tolerance test (OGTT) remains an important diagnostic tool for diabetes when results are uncertain.

Exercise Recommendations

Patients with blood glucose levels around 315 mg/dL should avoid vigorous exercise until glucose levels improve, especially if ketones are present, because physical activity may worsen hyperglycemia and increase the risk of diabetic ketoacidosis.

Managing Hypoglycemia

Hypoglycemia is generally defined as a blood glucose level below 70 mg/dL, although severe hypoglycemia may occur at much lower levels, such as 43 mg/dL.

If a patient has taken insulin but has not eaten, immediate treatment should include:

• Consuming a fast-acting carbohydrate, such as fruit juice or glucose tablets.

• Following this with a snack containing protein and complex carbohydrates to maintain blood glucose levels.

Patients with recurrent hypoglycemia may benefit from eating small, frequent meals throughout the day.

Preventing Diabetic Complications

Maintaining blood glucose within the target range significantly reduces the risk of:

• Diabetic retinopathy

• Nephropathy

• Neuropathy

• Cardiovascular disease

Poor glycemic control damages blood vessels by impairing oxygen delivery to tissues, resulting in progressive organ dysfunction.

Foot Care

Every clinical visit should include a comprehensive foot examination.

Healthcare providers should assess:

• Skin integrity

• Sensation

• Pulses

• Foot deformities

• Ulceration

• Infection

Patients with suspected Charcot foot require prompt foot radiography and referral to a specialist because delayed diagnosis can lead to permanent deformity.

Individuals with diabetic foot infections should receive early referral to podiatry for comprehensive management.

Diabetic Retinopathy

Patients without evidence of diabetic retinopathy may undergo dilated retinal examinations every two years, provided glycemic control remains stable and previous eye examinations are normal.

Recurrent Yeast Infections

Recurrent vulvovaginal candidiasis may indicate undiagnosed diabetes because elevated blood glucose promotes fungal growth. Screening for diabetes is appropriate in patients with recurrent infections.

Diabetic Emergencies

Diabetic Ketoacidosis

Diabetic ketoacidosis (DKA) is a life-threatening emergency most commonly triggered by infection or missed insulin doses.

Typical findings include:

• Kussmaul respirations

• Hyperglycemia

• Dehydration

• Abdominal pain

• Altered mental status

• Ketosis

Regular insulin is the preferred initial insulin therapy because of its rapid onset and ability to be administered intravenously.

Hyperosmolar Hyperglycemic State

Hyperosmolar hyperglycemic state (HHS) typically presents with:

• Severe hyperglycemia (often greater than 420 mg/dL)

• Profound dehydration

• Minimal or absent ketosis

• Neurological impairment

Older adults with type 2 diabetes are particularly susceptible.

Diabetes Medications

Metformin

Metformin remains the preferred first-line medication for most patients with type 2 diabetes because it improves insulin sensitivity without causing weight gain.

Advanced chronic kidney disease may contraindicate its use because of the risk of lactic acidosis.

Sulfonylureas

Glipizide (Glucotrol) should generally be avoided during pregnancy because insulin is considered the preferred therapy for managing diabetes in pregnant patients.

Corticosteroids

Prednisone commonly causes hyperglycemia by increasing insulin resistance and hepatic glucose production. Patients receiving corticosteroid therapy should have their blood glucose monitored closely.

Tricyclic Antidepressants

Tricyclic antidepressants may be prescribed for painful diabetic peripheral neuropathy when clinically appropriate.

Thyroid Disorders

The thyroid gland regulates metabolism, growth, and energy production. Disorders of thyroid function may produce systemic manifestations affecting nearly every organ system.

Hypothyroidism

Hypothyroidism develops when thyroid hormone production is insufficient.

Common symptoms include:

• Fatigue

• Cold intolerance

• Constipation

• Weight gain

• Dry skin

• Bradycardia

Patients presenting with cold intolerance and constipation should have thyroid-stimulating hormone (TSH) testing performed.

Monitoring Treatment

Levothyroxine (Synthroid) should be taken on an empty stomach before breakfast to optimize absorption.

Treatment effectiveness is monitored primarily through normalization of the TSH level.

Hyperthyroidism

Hyperthyroidism results from excessive thyroid hormone production.

Common symptoms include:

• Weight loss

• Heat intolerance

• Tremor

• Palpitations

• Anxiety

• Tachycardia

Evaluation typically includes measurement of TSH and free T4.

Graves Disease

Graves disease is the most common cause of hyperthyroidism and is an autoimmune disorder characterized by thyroid-stimulating antibodies.

Thyrotoxicosis

Thyrotoxicosis refers to the clinical syndrome caused by excessive circulating thyroid hormones regardless of the underlying cause.

Radioactive Iodine Therapy

Radioactive iodine destroys overactive thyroid tissue and is commonly used to treat hyperthyroidism in appropriate adult patients.

Thyroid Nodules and Thyroid Cancer

Most thyroid nodules are benign; however, malignancy must be excluded.

Suspicious findings include:

• Enlarging thyroid mass

• Hoarseness

• Cervical lymphadenopathy

• Hemoptysis

• Difficulty swallowing

Diagnostic Evaluation

Initial assessment often includes thyroid ultrasound.

Suspicious nodules require fine-needle aspiration (FNA) biopsy, which remains the diagnostic procedure of choice.

Patients with a large neck mass or thyroid enlargement should undergo ultrasound evaluation.

Adrenal Disorders

The adrenal glands produce hormones essential for stress response, blood pressure regulation, and metabolism.

Cushing Syndrome

Cushing syndrome results from prolonged exposure to excessive cortisol.

Typical findings include:

• Buffalo hump

• Central obesity

• Moon face

• Purple striae

• Hypertension

• Hyperglycemia

The 1-mg overnight dexamethasone suppression test is commonly used as a screening test.

Addison Disease

Addison disease results from adrenal insufficiency.

Common manifestations include:

• Fatigue

• Weight loss

• Hypotension

• Hyperpigmentation (“bronzed” appearance)

• Salt craving

Hydrocortisone remains the cornerstone of replacement therapy.

Obesity and Metabolic Syndrome

Obesity contributes substantially to diabetes, hypertension, cardiovascular disease, and obstructive sleep apnea.

Body Mass Index

A BMI of 32 kg/m² is classified as Class I obesity.

Weight-loss goals should emphasize gradual, sustainable lifestyle modifications rather than rapid weight reduction.

Metabolic Syndrome

Central obesity significantly increases cardiovascular risk.

For women, a waist circumference of 35 inches or greater is one of the diagnostic criteria for metabolic syndrome.

Gout

Gout is an inflammatory arthritis caused by monosodium urate crystal deposition.

Risk Factors

Major risk factors include:

• Hyperuricemia

• Obesity

• Alcohol use

• Chronic kidney disease

• Certain medications

Dietary Recommendations

Patients should:

• Limit high-purine foods.

• Maintain adequate hydration.

• Achieve a healthy body weight.

Evidence suggests that cherry consumption may reduce gout flares, whereas foods high in purines, including excessive spinach intake, should be limited in susceptible individuals.

Medications

Colchicine is commonly prescribed for acute gout attacks.

Thiazide diuretics should generally be avoided in patients with gout because they increase serum uric acid levels.

Other Endocrine Conditions

Gynecomastia

Gynecomastia is benign enlargement of male breast tissue and may result from hormonal imbalance, medications, liver disease, or endocrine disorders. Persistent or unexplained cases warrant further evaluation, including testosterone measurement when appropriate.

Pheochromocytoma

Pheochromocytoma is a catecholamine-secreting adrenal tumor that classically presents with episodic:

• Severe hypertension

• Headache

• Sweating

• Palpitations

Early recognition is important because untreated disease can be life-threatening.

Chvostek Sign

Chvostek sign is elicited by tapping the facial nerve, causing facial muscle contraction. It suggests hypocalcemia, commonly associated with hypoparathyroidism or severe vitamin D deficiency.

Healthy Lifestyle Counseling

Lifestyle interventions remain essential for preventing endocrine disease progression.

Recommended strategies include:

• Maintaining a healthy weight

• Following a balanced diet

• Exercising regularly

• Using non-stick cookware when appropriate for healthy meal preparation

• Monitoring blood glucose consistently

• Attending routine preventive healthcare visits

Frequently Asked Questions

What is the main difference between dementia and delirium?

Dementia is a progressive decline in cognitive function that develops gradually over months or years, whereas delirium is an acute, fluctuating disturbance in attention and awareness that develops over hours to days and is often reversible after treating the underlying cause.

Why must a head CT be performed before administering thrombolytic therapy for stroke?

A non-contrast head CT distinguishes ischemic stroke from hemorrhagic stroke. Thrombolytic therapy is indicated only for eligible patients with ischemic stroke and is contraindicated in intracranial bleeding.

What is the first-line medication for most patients with type 2 diabetes?

Metformin is generally recommended as the first-line medication because it improves insulin sensitivity, lowers blood glucose effectively, and has a favorable safety profile when renal function is adequate.

Why is vitamin B6 given with isoniazid?

Pyridoxine (vitamin B6) is prescribed with isoniazid to reduce the risk of peripheral neuropathy, a common adverse effect of long-term therapy.

What is the therapeutic range for theophylline?

The recommended therapeutic serum concentration is 5–15 mcg/mL. Levels above this range increase the risk of seizures and cardiac arrhythmias.

What are the hallmark symptoms of Parkinson disease?

The classic motor features include resting tremor, bradykinesia, muscular rigidity, and postural instability. Many patients also develop a shuffling gait and freezing episodes.

Which patients should receive supplemental oxygen for COPD?

Patients with severe chronic hypoxemia who meet guideline criteria benefit from long-term oxygen therapy, ideally for at least 15 hours per day, which has been shown to improve survival.

What are the warning signs of thyroid cancer?

Suspicious features include a rapidly enlarging thyroid nodule, persistent hoarseness, difficulty swallowing, cervical lymph node enlargement, and unexplained hemoptysis.

What is the difference between diabetic ketoacidosis and hyperosmolar hyperglycemic state?

Diabetic ketoacidosis primarily affects patients with type 1 diabetes and is characterized by ketosis, metabolic acidosis, and Kussmaul respirations. Hyperosmolar hyperglycemic state usually occurs in type 2 diabetes and presents with profound hyperglycemia, dehydration, and minimal ketosis.

Why is smoking cessation important?

Smoking cessation reduces the risk of cardiovascular disease, COPD progression, stroke, peripheral vascular disease, and multiple cancers while improving overall life expectancy and quality of life.

References

American Diabetes Association. (2025). Standards of care in diabetes—2025. Diabetes Care, 48(Suppl. 1). https://diabetesjournals.org/care

American Heart Association. (2024). Heart disease and stroke statistics update. https://www.heart.org

American Stroke Association. (2024). Stroke symptoms and treatment. https://www.stroke.org

Global Initiative for Asthma. (2024). Global strategy for asthma management and prevention. https://ginasthma.org

Global Initiative for Chronic Obstructive Lung Disease. (2025). Global strategy for the diagnosis, management, and prevention of COPD. https://goldcopd.org

Jameson, J. L., Fauci, A. S., Kasper, D. L., Hauser, S. L., Longo, D. L., & Loscalzo, J. (Eds.). (2022). Harrison’s principles of internal medicine (21st ed.). McGraw-Hill. https://accessmedicine.mhmedical.com

NU566 Midterm Review

National Institute of Neurological Disorders and Stroke. (2024). Neurological disorders. https://www.ninds.nih.gov

National Institutes of Health. (2024). MedlinePlus. https://medlineplus.gov

U.S. Preventive Services Task Force. (2024). Recommendation statements. https://www.uspreventiveservicestaskforce.org

World Health Organization. (2024). Tuberculosis. https://www.who.int/news-room/fact-sheets/detail/tuberculosis

World Health Organization. (2024). Diabetes. https://www.who.int/news-room/fact-sheets/detail/diabetes

World Health Organization. (2024). Cardiovascular diseases (CVDs). https://www.who.int/news-room/fact-sheets/detail/cardiovascular-diseases-(cvds)

World Health Organization. (2024). Chronic respiratory diseases. https://www.who.int/health-topics/chronic-respiratory-diseases

World Health Organization. (2024). Obesity and overweight. https://www.who.int/news-room/fact-sheets/detail/obesity-and-overweight