HESI: Current Medical Diagnosis & Treatment Practice Exam 2026 Comprehensive Review of 400 Real Multichoice Questions with Solutions and Clinical Rationale from Past Exams| Guaranteed Pass| Brand New!!

Prepare with confidence for your HESI (Health Education Systems Incorporated) examination using this all-inclusive practice guide featuring 400 meticulously curated multiple-choice questions with detailed rationales and clinical explanations. This comprehensive review resource mirrors the actual HESI exam format and covers all essential medical specialties tested on the 2026 examination. HESI: Current Medical Diagnosis & Treatment Practice Exam 2026 Comprehensive Review of 400 Real Multichoice Questions with Solutions and Clinical Rationale from Past Exams| Guaranteed Pass| Brand New!! Introduction Welcome to this comprehensive HESI practice examination designed to assess your knowledge of current medical diagnosis and treatment principles. This guide contains 400 multiple-choice questions covering essential topics in clinical medicine, including cardiology, pulmonology, gastroenterology, endocrinology, neurology, infectious diseases, and more. Each question is formatted with four answer choices (A, B, C, D), followed by the correct answer and a detailed rationale to reinforce your understanding of key concepts. This practice exam is ideal for nursing students, medical students, and healthcare professionals preparing for the HESI (Health Education Systems Incorporated) examination or other standardized medical assessments. The questions have been carefully curated and organized to mirror the actual HESI exam format, with emphasis on high-yield topics commonly tested. Use this resource to identify knowledge gaps, reinforce important clinical concepts, and build confidence for your upcoming examination. ________________________________________ Table of Contents Section 1: Cardiology and Vascular System (Questions 1-65) Section 2: Pulmonology and Respiratory System (Questions 66-105) Section 3: Gastroenterology and Hepatology (Questions 106-155) Section 4: Endocrinology and Metabolism (Questions 156-195) Section 5: Nephrology and Urology (Questions 196-225) Section 6: Neurology and Sensory Systems (Questions 226-265) Section 7: Infectious Diseases and Immunology (Questions 266-305) Section 8: Rheumatology and Autoimmune Disorders (Questions 306-335) Section 9: Hematology and Oncology (Questions 336-365) Section 10: Dermatology and Integumentary System (Questions 366-390) Section 11: Comprehensive Review (Questions 391-400) ________________________________________ MULTICHOICE SECTION 1: CARDIOLOGY AND VASCULAR SYSTEM Question 1 Which cardiac biomarker is the first to become elevated following acute myocardial infarction? A) Creatine Kinase-MB B) Myoglobin C) Troponin I D) Lactate Dehydrogenase Answer: C) Troponin I Rationale: Troponin I and Troponin T are highly specific cardiac markers that begin to rise within 3-4 hours after myocardial infarction, peaking at 24-48 hours. While myoglobin rises earlier (1-2 hours), it lacks cardiac specificity. CK-MB rises in 4-6 hours but is less specific than troponin. LDH rises much later (24-48 hours) and is no longer routinely used. ________________________________________ Question 2 A 65-year-old male presents with crushing substernal chest pain radiating to the left arm, diaphoresis, and nausea. Which ECG finding is most characteristic of acute ST-elevation myocardial infarction? A) ST-segment depression B) T-wave inversion C) ST-segment elevation D) Q-wave formation Answer: C) ST-segment elevation Rationale: ST-segment elevation in at least two contiguous leads is the hallmark of acute STEMI, indicating transmural ischemia. ST depression and T-wave inversion suggest subendocardial ischemia or NSTEMI. Q waves typically appear hours to days after infarction, indicating established myocardial necrosis. ________________________________________ Question 3 A patient with known coronary artery disease reports chest discomfort that occurs with exertion and is relieved by rest. This presentation is most consistent with: A) Unstable angina B) Stable angina C) Myocardial infarction D) Pericarditis Answer: B) Stable angina Rationale: Stable angina is characterized by predictable chest pain that occurs with physical exertion or emotional stress and is relieved by rest or sublingual nitroglycerin. Unstable angina occurs at rest or with minimal exertion. Myocardial infarction presents with prolonged pain not relieved by rest. Pericarditis pain is typically positional and pleuritic. ________________________________________ Question 4 Which valvular disorder is most likely to produce a systolic crescendo-decrescendo murmur heard best at the second right intercostal space with radiation to the carotid arteries? A) Mitral stenosis B) Aortic stenosis C) Mitral regurgitation D) Aortic regurgitation Answer: B) Aortic stenosis Rationale: Aortic stenosis produces a characteristic systolic ejection murmur with a crescendo-decrescendo pattern, heard best at the right upper sternal border (second right intercostal space) and radiating to the neck/carotids. Mitral stenosis produces a diastolic rumble. Mitral regurgitation produces a holosystolic murmur at the apex with radiation to the axilla. Aortic regurgitation produces a diastolic decrescendo murmur. ________________________________________ Question 5 Which of the following is the most common cause of right-sided heart failure? A) Pulmonary hypertension B) Left-sided heart failure C) Tricuspid valve disease D) Pulmonary embolism Answer: B) Left-sided heart failure Rationale: Left-sided heart failure is the most common cause of right-sided heart failure. When the left ventricle fails, pressure backs up into the pulmonary circulation, causing pulmonary hypertension. This increased pressure in the pulmonary arteries leads to right ventricular strain and eventually right-sided heart failure. ________________________________________ Question 6 A 72-year-old male with a history of hypertension presents with dyspnea on exertion, orthopnea, and paroxysmal nocturnal dyspnea. Bilateral crackles are heard at the lung bases. The most likely diagnosis is: A) Chronic obstructive pulmonary disease B) Pulmonary embolism C) Left-sided heart failure D) Pneumonia Answer: C) Left-sided heart failure Rationale: The classic triad of dyspnea on exertion, orthopnea (dyspnea when lying flat), and paroxysmal nocturnal dyspnea (waking up gasping for air) is highly suggestive of left-sided heart failure. Bilateral basal crackles result from pulmonary congestion. These symptoms are caused by increased left ventricular end-diastolic pressure leading to pulmonary venous congestion. ________________________________________ Question 7 Which medication is the first-line treatment for acute heart failure with pulmonary edema? A) Digoxin B) Nitroglycerin C) Furosemide D) Dobutamine Answer: C) Furosemide Rationale: Loop diuretics like furosemide are first-line therapy for acute heart failure with pulmonary edema. They rapidly reduce preload by promoting diuresis and venous vasodilation, relieving pulmonary congestion. Nitroglycerin reduces preload but is typically used adjunctively. Digoxin provides inotropic support but is not first-line for acute management. Dobutamine is reserved for cardiogenic shock. ________________________________________ Question 8 A patient with atrial fibrillation has an irregularly irregular pulse. Which ECG finding confirms this rhythm? A) Absent P waves with irregular QRS complexes B) Sawtooth P waves C) Prolonged PR interval D) Wide QRS complexes Answer: A) Absent P waves with irregular QRS complexes Rationale: Atrial fibrillation is characterized by absent P waves, replaced by fine or coarse fibrillatory (f) waves, and an irregularly irregular ventricular response. Sawtooth P waves are seen in atrial flutter. Prolonged PR interval indicates first-degree AV block. Wide QRS complexes suggest ventricular conduction abnormalities or ventricular tachycardia. ________________________________________ Question 9 Which finding is most characteristic of coarctation of the aorta? A) Bounding peripheral pulses B) Upper extremity hypertension with delayed or weak femoral pulses C) Equal blood pressure in all extremities D) Continuous murmur over the back Answer: B) Upper extremity hypertension with delayed or weak femoral pulses Rationale: Coarctation of the aorta causes narrowing of the aorta, typically distal to the left subclavian artery. This results in hypertension in the upper extremities and decreased blood pressure with delayed or weak femoral pulses (radiofemoral delay). A continuous murmur may be heard but is less specific. ________________________________________ Question 10 What is the most likely cause of jugular venous distention, distant heart sounds, and hypotension? A) Cardiac tamponade B) Aortic dissection C) Pulmonary embolism D) Myocardial infarction Answer: A) Cardiac tamponade Rationale: Cardiac tamponade presents with Beck's triad: hypotension, muffled/distant heart sounds, and jugular venous distention. The condition results from fluid accumulation in the pericardial sac, compressing the heart and reducing cardiac output. While pulmonary embolism and MI may cause JVD, they do not present with all three components of Beck's triad. ________________________________________ Question 11 Which of the following is the most common cause of endocarditis in intravenous drug users? A) Streptococcus viridans B) Staphylococcus aureus C) Enterococcus faecalis D) Pseudomonas aeruginosa Answer: B) Staphylococcus aureus Rationale: Staphylococcus aureus is the most common cause of infective endocarditis in intravenous drug users, typically affecting the tricuspid valve. Streptococcus viridans is more common in patients with underlying valvular disease. Enterococci are associated with gastrointestinal/genitourinary sources. ________________________________________ Question 12 A 45-year-old smoker presents with intermittent leg pain that occurs with walking and is relieved by rest. His feet are cool with diminished pulses. The most likely diagnosis is: A) Deep vein thrombosis B) Peripheral arterial disease C) Varicose veins D) Lumbar spinal stenosis Answer: B) Peripheral arterial disease Rationale: Intermittent claudication—pain with walking relieved by rest—is the classic symptom of peripheral arterial disease (PAD). Diminished pulses and cool extremities support the diagnosis. DVT presents with unilateral leg swelling and pain. Varicose veins are superficial and typically asymptomatic. Spinal stenosis pain is often relieved by leaning forward. ________________________________________ Question 13 Which medication is used to reverse warfarin-induced anticoagulation in the setting of major bleeding? A) Vitamin K B) Protamine sulfate C) Fresh frozen plasma D) Andexanet alfa Answer: A) Vitamin K Rationale: Vitamin K is the specific reversal agent for warfarin, working by providing the cofactor needed for hepatic synthesis of clotting factors II, VII, IX, and X. Fresh frozen plasma also reverses warfarin but more slowly and is used in emergency situations. Protamine sulfate reverses heparin. Andexanet alfa reverses factor Xa inhibitors. ________________________________________ Question 14 A 68-year-old male presents with severe tearing chest pain radiating to the back. Blood pressure is 200/110 mmHg. Which diagnosis is most likely? A) Myocardial infarction B) Aortic dissection C) Pulmonary embolism D) Pericarditis Answer: B) Aortic dissection Rationale: Tearing chest pain radiating to the back in a hypertensive patient is classic for aortic dissection. Unlike MI, the pain is often maximal at onset and may migrate. Hypertension is the most common predisposing factor. Pericarditis pain is positional and pleuritic. PE typically presents with sudden onset dyspnea. ________________________________________ Question 15 Which cardiac rhythm is associated with an increased risk of thromboembolic stroke? A) Sinus bradycardia B) Atrial fibrillation C) Ventricular tachycardia D) First-degree AV block Answer: B) Atrial fibrillation Rationale: Atrial fibrillation significantly increases the risk of thromboembolic stroke due to stasis of blood in the non-contracting atria, leading to thrombus formation, particularly in the left atrial appendage. This risk is quantified using the CHA₂DS₂-VASc score and may require anticoagulation. ________________________________________ Question 16 Which physical finding is most suggestive of aortic regurgitation? A) Systolic ejection murmur at the right upper sternal border B) Diastolic decrescendo murmur at the left lower sternal border C) Mid-diastolic rumble at the apex D) Holosystolic murmur at the apex Answer: B) Diastolic decrescendo murmur at the left lower sternal border Rationale: Aortic regurgitation produces a high-pitched blowing diastolic decrescendo murmur, best heard at the left lower sternal border (Erb's point) with the patient leaning forward in expiration. The murmur results from backward flow of blood from the aorta into the left ventricle during diastole. ________________________________________ Question 17 Which of the following is a modifiable risk factor for coronary artery disease? A) Age B) Gender C) Family history D) Hyperlipidemia Answer: D) Hyperlipidemia Rationale: Hyperlipidemia is a modifiable risk factor for coronary artery disease, along with smoking, hypertension, diabetes, and obesity. Age, gender, and family history are non-modifiable risk factors. Managing hyperlipidemia with lifestyle modifications and medications like statins can reduce cardiovascular risk. ________________________________________ Question 18 A patient presents with an irregularly irregular pulse, fatigue, and shortness of breath. Which diagnostic test would confirm atrial fibrillation? A) Chest X-ray B) Electrocardiogram C) Cardiac stress test D) Echocardiogram Answer: B) Electrocardiogram Rationale: ECG is the gold standard for diagnosing atrial fibrillation, showing absent P waves, irregularly irregular QRS complexes, and fibrillatory waves. While echocardiography may identify structural heart disease and chest X-ray may show cardiomegaly, they are not diagnostic of the arrhythmia itself.