Cardiovascular System

A 62-year-old man is brought to the emergency department via ambulance due to the sudden onset of severe, excruciating chest pain that radiates to his interscapular region. Shortly after the pain began, he developed severe shortness of breath. His medical history is significant for poorly controlled hypertension, tobacco use, and chronic obstructive pulmonary disease. On arrival, his blood pressure is 185/105 mmHg in the right arm and 178/100 mmHg in the left arm. His pulse is 118/min, and his respiratory rate is 28/min with an oxygen saturation of 88% on room air. Physical examination reveals a diaphoretic man in severe respiratory distress. Lung auscultation demonstrates diffuse bilateral expiratory wheezing with crackles at the lung bases. Cardiovascular examination reveals a new decrescendo diastolic murmur loudest at the right upper sternal border. An electrocardiogram shows sinus tachycardia with left ventricular hypertrophy. Which of the following is the most appropriate initial pharmacological step in the management of this patient?

A rapid response team is called to the bedside of a $72$-year-old woman who was admitted two days ago for community-acquired pneumonia and a suspected exacerbation of chronic obstructive pulmonary disease (COPD). Her medical history includes tobacco use disorder, type 2 diabetes mellitus, and a prior anterior myocardial infarction. Initial management included intravenous ceftriaxone, azithromycin, inhaled bronchodilators, and systemic glucocorticoids. Sputum cultures obtained on admission are now growing *Streptococcus pneumoniae* that is susceptible to penicillin.

Over the past $4$ hours, the patient has developed sudden, severe respiratory distress. Her temperature is $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), blood pressure is $182/104$ mm Hg, pulse is $115$/min, and respirations are $28$/min. Pulse oximetry shows $86\%$ on room air. Physical examination reveals jugular venous distention to $11$ cm H $_2$ O. Chest auscultation reveals prolonged expiration with diffuse bilateral wheezing. Cardiac auscultation shows a regular tachycardia without murmurs. Point-of-care ultrasound of the lungs demonstrates diffuse bilateral B-lines.

Laboratory studies show:
Serum sodium: $138$ mEq/L
Serum potassium: $4.2$ mEq/L
Serum chloride: $104$ mEq/L
Serum bicarbonate: $16$ mEq/L
Serum creatinine: $1.6$ mg/dL

Thyroid-stimulating hormone (TSH): $1.2$ mIU/L (N: $0.4 - 4.0$ mIU/L)
Free T4: $0.7$ ng/dL (N: $0.9 - 1.7$ ng/dL)

Arterial blood gas (room air):
pH: $7.30$
PaCO $_2$: $32$ mm Hg
PaO $_2$: $58$ mm Hg

Which of the following is the most appropriate next step in management?

A 28-year-old woman presents to the emergency department complaining of a sudden onset of rapid heart palpitations and mild chest fullness that began 30 minutes ago while she was watching television. She denies any chest pain, lightheadedness, or loss of consciousness. Her vital signs are temperature 37.0°C (98.6°F), blood pressure 118/76 mmHg, heart rate 175/min, and respiratory rate 16/min. Physical examination reveals a rapid, regular pulse and clear lungs. A 12-lead electrocardiogram (ECG) demonstrates a regular, narrow-complex tachycardia at a rate of 175/min with no discernible P waves.

Arrange the following therapeutic interventions in the most appropriate chronological sequence for the acute and definitive management of this condition, assuming each preceding step is ineffective.

Match each detailed clinical description of a cardiac murmur and its response to dynamic physiological maneuvers with the correct underlying structural pathology.

Match each classic peripheral arterial pulse abnormality with its most commonly associated cardiovascular pathology.

During a routine morning clinic shift, a physician evaluates a 68-year-old male patient who reports worsening breathing difficulties over the past three days. The patient, who has a 40-pack-year smoking history and known systemic hypertension, states that he must sleep propped up on three pillows and recently woke up abruptly feeling starved for air. Vital signs include a blood pressure of 162/94 mm Hg, heart rate of 95/min, and respiratory rate of 22/min. Physical examination reveals elevated jugular venous pressure, a distinct third heart sound (S3), and bibasilar crackles on inspiration. Bilateral 2+ pitting edema is noted in the lower extremities. Which of the following is the most appropriate initial pharmacological intervention for this patient's current condition?

A 62-year-old man presents to the emergency department reporting continuous, crushing left-sided chest pain that began two hours ago. He is diagnosed with an acute ST-segment elevation myocardial infarction (STEMI) and is monitored closely. Arrange the following classic electrocardiographic (ECG) changes in the typical chronological order that they appear during the natural evolution of an untreated transmural myocardial infarction.

A ward nurse urgently pages the on-call physician to evaluate a 71-year-old male inpatient for acute clinical deterioration. The patient was admitted two days prior for a presumed mild lower respiratory tract infection. His medical history is significant for a prior anterior myocardial infarction, diet-controlled type 2 diabetes, and a 45-pack-year smoking history. Upon evaluation, the patient is lethargic, diaphoretic, and in profound respiratory distress. Vital signs are temperature 37.0°C (98.6°F), blood pressure 82/54 mm Hg, pulse 124/min, and respirations 28/min. Pulse oximetry displays 84% on room air. Physical examination reveals cool, clammy extremities. Chest auscultation demonstrates diffuse, high-pitched expiratory wheezing bilaterally without focal crackles. Cardiac auscultation reveals tachycardia with a distinct low-frequency sound heard immediately following $S_2$. Sustained pressure over the right upper abdominal quadrant causes the neck veins to visibly engorge and remain elevated. Arterial blood gas analysis on room air reveals a $pH$ of 7.26, $PaCO_2$ of 60 mm Hg, and $HCO_3^-$ of 26 mEq/L. Which of the following is the most appropriate next step in the management of this patient?

A 68-year-old man is brought to the emergency department via ambulance with a 30-minute history of sudden-onset, severe, "tearing" chest pain that radiates to his back between his shoulder blades. His blood pressure is 210/115 mm Hg in the right arm and 175/95 mm Hg in the left arm, and his heart rate is 112/min. He appears visibly distressed and diaphoretic. An ECG shows sinus tachycardia with voltage criteria for left ventricular hypertrophy, but no acute ischemic changes. A chest radiograph demonstrates a widened mediastinum. The clinical presentation is highly suspicious for an acute aortic dissection. Arrange the following management steps in the most appropriate sequential order for the optimal care of this patient.

Paramedics arrive at the emergency department bringing a 74-year-old woman who woke up suddenly with severe shortness of breath two hours ago. She reports progressively worsening exertional dyspnea over the preceding three days. Her medical history includes hypertension, hyperlipidemia, osteoarthritis, and a 40-pack-year smoking history. Current medications are amlodipine, atorvastatin, and ibuprofen. Vital signs are temperature 37.1°C (98.8°F), blood pressure 175/95 mmHg, pulse 110/min, and respiratory rate 26/min. Pulse oximetry shows 89% on room air. The patient is sitting upright on the edge of the stretcher, using accessory muscles of respiration. Lung auscultation reveals diffuse, prominent expiratory wheezing bilaterally. Which of the following physical examination findings is most specific for confirming a cardiogenic etiology for this patient's acute symptoms rather than a primary pulmonary exacerbation?

A patient with a significant history of systemic hypertension and extensive tobacco use is evaluated in the outpatient setting for progressive dyspnea, orthopnea, and recent episodes of waking up gasping for air. Vital signs show a blood pressure of 152/94 mm Hg, a heart rate of 98/min, and a respiratory rate of 22/min. Lung auscultation demonstrates bilateral crackles at the lung bases and scattered expiratory wheezes. The clinician suspects acute decompensated heart failure but wants to differentiate it from a chronic obstructive pulmonary disease exacerbation. Which of the following physical examination findings is most specific for identifying decompensated heart failure in this clinical scenario?

Paramedics evaluate a 61-year-old male at his residence following an emergency call for sudden-onset, excruciating retrosternal chest pain that radiates to his mid-back. He is immediately transported to the nearest tertiary care center. On arrival, the patient is visibly distressed, diaphoretic, and tachypneic. His medical history is notable for uncontrolled hypertension and a 40-pack-year smoking history. Vital signs demonstrate a temperature of 36.8°C (98.2°F), a heart rate of 122/min, a blood pressure of 78/46 mm Hg in the right arm and 82/48 mm Hg in the left arm, and an oxygen saturation of 88% on room air. Physical examination reveals elevated jugular venous pressure and diffuse bilateral crackles on lung auscultation. A bounding, early diastolic decrescendo murmur is auscultated along the right sternal border. An electrocardiogram reveals sinus tachycardia with left ventricular hypertrophy but no acute ischemic ST-segment changes. Which of the following is the most appropriate next step in the management of this patient?

An evaluation is requested for a $45$-year-old woman suffering from resistant hypertension. Her current daily medication regimen includes maximal tolerated doses of amlodipine, valsartan, and hydrochlorothiazide. In the clinic, her blood pressure is persistently elevated at $172/104\text{ mm Hg}$, with a heart rate of $78\text{ /min}$. A basic metabolic panel reveals a serum potassium concentration of $2.8\text{ mEq/L}$. The physician suspects primary hyperaldosteronism as the underlying etiology. Arrange the following clinical steps in the most appropriate chronological sequence for the definitive workup and management of this patient.

A 72-year-old man with a long-standing history of tobacco use disorder, emphysema, and ischemic cardiomyopathy presents to the emergency department complaining of acutely worsening shortness of breath for the past 24 hours. He appears visibly distressed and is leaning forward in the tripod position. Vital signs show a temperature of 37.2°C (99.0°F), blood pressure of 145/88 mm Hg, pulse of 105/min, and respiratory rate of 28/min. Pulse oximetry reveals an oxygen saturation of 88% on room air. Physical examination demonstrates diffuse expiratory wheezing bilaterally, but auscultation of the heart sounds is difficult due to the noisy lung fields. The patient has mild bilateral pitting edema at the ankles, which he states is chronic. Given the overlapping clinical features of his comorbidities, which of the following laboratory tests is most useful to rapidly determine whether his acute presentation is primarily driven by decompensated heart failure rather than a pulmonary exacerbation?

A 68-year-old man is brought to the emergency department due to acute-onset, severe shortness of breath. He reports a dry cough and diffuse wheezing that began 2 hours prior to arrival. His medical background includes severe chronic obstructive pulmonary disease (COPD), essential hypertension, and a previous anterior myocardial infarction. At home, he used his albuterol inhaler three times with no improvement. Vital signs include a temperature of $37.0^\circ\text{C}$ ($98.6^\circ\text{F}$), blood pressure of $178/104\text{ mm Hg}$, heart rate of $114/\text{min}$, and respiratory rate of $28/\text{min}$. Pulse oximetry reveals an oxygen saturation of $86\%$ on room air. Physical examination shows a diaphoretic man in a tripod position, utilizing accessory muscles of respiration. The jugular venous pressure is visually elevated to $11\text{ cm H}_2\text{O}$. Cardiac auscultation reveals a regular tachycardia with a prominent early diastolic extra heart sound. Lung auscultation demonstrates bilateral expiratory wheezing; notably, no crackles are auscultated. A chest radiograph reveals hyperinflated lung fields, an enlarged cardiac silhouette, and cephalization of the pulmonary vasculature, without any focal consolidation. The patient is immediately initiated on noninvasive positive pressure ventilation (NIPPV). Over the next 15 minutes, his work of breathing and oxygen saturation improve significantly. Which of the following mechanisms best explains the primary physiological basis for this patient's rapid clinical improvement?

An emergency response team brings a 54-year-old male to the resuscitation bay after he experienced sudden, crushing central chest pain while working in his garden. The pain radiates to his jaw and is accompanied by profuse sweating. En route to the hospital, the transport personnel administered 325 mg of chewable aspirin and one dose of sublingual nitroglycerin. Shortly after receiving the nitroglycerin, the patient developed profound lightheadedness.

Currently, his blood pressure is 78/48 mmHg, and his pulse is 52/min. His respiratory rate is 16/min, and oxygen saturation is 96% on room air.

Physical examination reveals clear lung fields bilaterally. The jugular veins are markedly distended while the patient is positioned at a 45-degree angle.

A 12-lead electrocardiogram demonstrates 3-mm ST-segment elevations in leads II, III, and aVF, as well as ST-segment depressions in leads I and aVL.

Which of the following is the most appropriate initial step to manage this patient's hemodynamic instability?

Match each central hemodynamic profile obtained via pulmonary artery (Swan-Ganz) catheterization to its most likely underlying pathophysiological etiology.

A 71-year-old man is brought to the emergency department by his wife due to progressively worsening shortness of breath and a persistent, dry cough over the past 48 hours. He states that the breathlessness is most severe when he lies down, forcing him to sleep in a recliner chair. His medical history includes hypertension, osteoarthritis, and severe chronic obstructive pulmonary disease (COPD) for which he uses a daily tiotropium inhaler. Two weeks ago, he was prescribed daily high-dose naproxen for severe bilateral knee pain. His temperature is 37.1°C (98.8°F), blood pressure is 172/96 mmHg, pulse is 112/min, and respirations are 26/min. Pulse oximetry shows 88% on room air. Physical examination reveals a patient in moderate respiratory distress using accessory muscles of respiration. Lung auscultation demonstrates diffuse, high-pitched expiratory wheezes and a prolonged expiratory phase. Cardiac auscultation reveals a regular tachycardia without murmurs; no extra heart sounds are audible. Jugular venous pressure is estimated at 12 cm H2O. Chest radiography reveals baseline hyperinflation with new, bilateral, hazy interstitial opacities and thickening of the interlobular septa. Arterial blood gas on room air shows a pH of 7.47, PaCO2 of 32 mmHg, and PaO2 of 56 mmHg. Which of the following is the most appropriate next step in the pharmacologic management of this patient?

A 58-year-old man is found unresponsive on the floor of his hospital room. He has no palpable pulse and is not breathing. The emergency response team arrives with a crash cart. Arrange the following actions in the correct sequential order for managing this patient's cardiac arrest, assuming the initial rhythm identified on the monitor is ventricular fibrillation.

During a clinical skills workshop, a group of medical students is reviewing characteristic peripheral pulse findings in various cardiovascular disorders. Match each described arterial pulse abnormality with the underlying cardiac pathology it most classically represents.