Cardiovascular System

A 45-year-old woman from a developing country presents to the clinic with progressive dyspnea on exertion, orthopnea, and occasional palpitations. Physical examination reveals a loud S1, an opening snap, and a low-pitched mid-diastolic rumble at the cardiac apex. Echocardiography confirms severe mitral stenosis. Arrange the following pathophysiological events in the correct chronological order of this patient's disease progression, from the initial insult to the current hemodynamic state.

Match each precise electrocardiographic (ECG) morphological description with its most strongly associated underlying cardiovascular pathology or clinical condition.

A $71$-year-old male is evaluated on the surgical ward due to the sudden onset of difficulty breathing. He underwent an uncomplicated right total hip arthroplasty four days ago. His medical history includes essential hypertension, hypercholesterolemia, diet-controlled type 2 diabetes mellitus, and a $35$-pack-year history of smoking. During his hospitalization, he has been receiving continuous intravenous normal saline at $100\text{ mL/hr}$.

This morning, the patient developed worsening dyspnea, particularly when lying flat, along with a persistent dry cough. His temperature is $37.5^\circ\text{C}$ ($99.5^\circ\text{F}$), blood pressure is $162/94\text{ mmHg}$, pulse is $112/\text{min}$, and respiratory rate is $26/\text{min}$. Pulse oximetry indicates an oxygen saturation of $88\%$ on room air.

Physical examination reveals elevated jugular venous pressure. Cardiac auscultation shows a regular tachycardia with a distinct $S_3$ gallop. Pulmonary examination is notable for dullness to percussion at the lung bases, diffuse bilateral crackles, and scattered expiratory wheezing. The surgical incision is healing appropriately. Examination of the lower extremities reveals bilateral, symmetric pitting edema up to the mid-calves.

Which of the following is the most appropriate initial step in the management of this patient?

A $74$-year-old man is brought to the emergency department due to acute worsening of shortness of breath and severe agitation. He has a history of ischemic cardiomyopathy with a left ventricular ejection fraction of $35\%$, severe chronic obstructive pulmonary disease (COPD), and hypothyroidism. Over the last $2$ days, he has had an increased cough productive of white sputum and progressive orthopnea. His current medications include lisinopril, carvedilol, tiotropium, levothyroxine, and as-needed albuterol.

Vital signs:
Temperature: $37.2^\circ\text{C}$ ($99.0^\circ\text{F}$)
Blood pressure: $178/102\text{ mmHg}$
Heart rate: $118/\text{min}$
Respiratory rate: $28/\text{min}$
SpO $_2$: $84\%$ on room air

Physical examination reveals an agitated man in severe respiratory distress, using accessory muscles of respiration. Jugular venous distension is prominent at $12\text{ cm H}_2\text{O}$. Auscultation of the lungs reveals prolonged expiration with loud, diffuse bilateral wheezing, but no crackles are distinctly appreciated. Cardiac auscultation reveals a regular tachycardia; a third heart sound ($S_3$) is present. Trace bilateral lower extremity edema is noted.

Arterial blood gas on room air:
pH: $7.28$
PaCO $_2$: $60\text{ mmHg}$
PaO $_2$: $52\text{ mmHg}$
HCO $_3^-$: $27\text{ mEq/L}$

Thyroid-stimulating hormone (TSH) is $4.5\text{ \mu U/mL}$ (normal: $0.5$-$5.0\text{ \mu U/mL}$), and free T4 is $1.1\text{ ng/dL}$ (normal: $0.9$-$1.7\text{ ng/dL}$). A chest radiograph shows cardiomegaly and prominent interstitial markings without focal consolidation.

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

Match each clinical presentation with its most characteristic echocardiographic finding.

A 62-year-old man is admitted to the cardiac intensive care unit following a large anterior ST-segment elevation myocardial infarction. On hospital day 2, he suddenly becomes unresponsive. The patient is apneic, and no central pulse is palpable. The continuous telemetry monitor demonstrates coarse ventricular fibrillation. A resuscitation team is immediately activated. Arrange the following steps in the most appropriate chronological sequence for the management of this patient's cardiac arrest according to standard advanced cardiovascular life support (ACLS) guidelines.

A 65-year-old man presents to the emergency department with a 24-hour history of progressively worsening shortness of breath and a cough productive of clear sputum. His past medical history is significant for an ischemic cardiomyopathy with a left ventricular ejection fraction of $35\%$, as well as severe chronic obstructive pulmonary disease. His temperature is $37.2^\circ\text{C}$ ($99.0^\circ\text{F}$), blood pressure is $142/88\text{ mmHg}$, pulse is $115\text{/min}$, and respirations are $26\text{/min}$. Pulse oximetry is $89\%$ on room air. Physical examination reveals a patient in moderate respiratory distress using accessory muscles of respiration. Assessment of the jugular venous pressure shows flat neck veins when the patient is seated at a 45-degree angle. Pulmonary auscultation reveals diffuse bilateral expiratory wheezes and a markedly prolonged expiratory phase, with no crackles. Cardiac auscultation reveals a regular tachycardia with a normal $S_1$ and $S_2$; there is no $S_3$ gallop or murmur. The lower extremities show no pitting edema. A portable chest radiograph demonstrates hyperinflated lung fields and flattened hemidiaphragms, with no evidence of pulmonary vascular congestion, focal infiltrates, or pleural effusions. Which of the following is the most appropriate initial management for this patient's acute presentation?

A $34$-year-old female arrives at the emergency department reporting a sudden onset of a racing heartbeat that began while she was sitting at her desk. She feels anxious but denies chest discomfort, dyspnea, or lightheadedness. Her blood pressure is $122/78$ mm Hg, heart rate is $178$/min, and oxygen saturation is $99\%$ on room air. An electrocardiogram demonstrates a regular, narrow-complex tachycardia with no discernible P waves. Assuming each successive step fails to terminate the arrhythmia, arrange the following therapeutic interventions in the correct chronological order recommended by current advanced cardiovascular life support (ACLS) guidelines for a hemodynamically stable patient.

A $29$-year-old G1P0 woman at $32$ weeks gestation is brought to the emergency department due to the acute onset of severe shortness of breath and a cough productive of pink, frothy sputum. She recently emigrated from a developing country and had limited prenatal care. She reports a history of frequent, untreated sore throats during childhood. Her temperature is $37.8^\circ\text{C}$ ($100.0^\circ\text{F}$), blood pressure is $110/68\text{ mmHg}$, pulse is $135/\text{min}$ and irregularly irregular, and respirations are $28/\text{min}$. Pulse oximetry shows $86\%$ on room air. Physical examination reveals elevated jugular venous pressure. Lung auscultation demonstrates bibasilar crackles and diffuse expiratory wheezes. Cardiac examination reveals a loud S1 and a low-pitched, rumbling, mid-diastolic murmur heard best at the apex.

Laboratory results are as follows:

Continuous fetal heart rate monitoring shows a baseline of $150/\text{min}$ with moderate variability and recurrent late decelerations. Which of the following is the most appropriate next step in management?

An evaluation is requested for a 59-year-old man who comes to the outpatient clinic complaining of a progressive decline in his exercise tolerance over the past six months. He reports having to stop and catch his breath after walking just one block. The patient also notes a persistent dry cough, which frequently wakes him up at night. His medical history includes untreated hypertension and a 35-pack-year smoking history. Vital signs show a blood pressure of 162/98 mm Hg, a heart rate of 88/min, and an oxygen saturation of 94% on room air. On physical examination, the apical impulse is laterally displaced and sustained. Cardiac auscultation reveals a low-frequency diastolic sound just after S2 and a blowing, holosystolic murmur at the cardiac apex. Lung auscultation demonstrates bilateral basilar crackles without wheezing. In-office spirometry reveals a forced expiratory volume in 1 second (FEV1) to forced vital capacity (FVC) ratio of 0.82. Which of the following is the most likely underlying mechanism for this patient's respiratory symptoms?

Match each clinical vignette describing a patient with a structural heart defect to the expected physiologic response of their cardiac physical exam findings during dynamic auscultation maneuvers.

Match each of the following acute cardiovascular clinical presentations to the most appropriate initial pharmacological intervention.

A 72-year-old woman comes to the clinic reporting progressive shortness of breath with exertion over the past 4 months. She can now walk only half a block before needing to stop to catch her breath. She has a history of hypertension, type 2 diabetes mellitus, and chronic obstructive pulmonary disease (COPD). She has a 40-pack-year smoking history but quit 5 years ago. She uses her tiotropium and albuterol inhalers daily, but they have not relieved her recent symptoms. Blood pressure is $158/92$ mm Hg, pulse is $84$/min, and respirations are $18$/min. Pulse oximetry is $94\%$ on room air. Jugular venous pressure is elevated at $9$ cm $H_2O$. Lung auscultation reveals diminished breath sounds bilaterally without wheezes or crackles. Cardiac examination shows a regular rate and rhythm, a loud pulmonic component of the second heart sound ($P_2$), and a fourth heart sound ($S_4$). There is 2+ pitting edema in the lower extremities. Transthoracic echocardiography demonstrates an estimated left ventricular ejection fraction of $65\%$, severe left atrial enlargement, marked concentric left ventricular hypertrophy, and right ventricular dilation. Estimated pulmonary artery systolic pressure is $58$ mm Hg. Which of the following is the most likely primary mechanism for this patient's elevated pulmonary artery pressure?

A 65-year-old man is brought to the emergency department at 3:00 AM due to sudden, severe difficulty breathing. He states he woke up gasping for air and had to sit upright on the edge of his bed. His medical history includes hypertension, type 2 diabetes mellitus, and a 40-pack-year smoking history. Current medications include amlodipine and metformin. His temperature is $37.0^\circ\text{C}$ ($98.6^\circ\text{F}$), blood pressure is $185/105\text{ mmHg}$, pulse is $112/\text{min}$, and respirations are $28/\text{min}$. Pulse oximetry shows an oxygen saturation of $86\%$ on room air. Physical examination reveals distended neck veins when sitting at a 45-degree angle. Cardiac auscultation reveals a regular tachycardia with a prominent third heart sound (S3). Lung auscultation reveals bilateral basilar crackles extending halfway up the posterior lung fields, without wheezing. Bilateral 1+ pitting edema is present in the lower extremities. Arterial blood gas on room air shows a pH of $7.31$, $\text{pCO}_2$ of $52\text{ mmHg}$, and $\text{pO}_2$ of $58\text{ mmHg}$. Laboratory studies show a normal leukocyte count. Thyroid function tests reveal a TSH of $1.5\text{ \mu U/mL}$ (normal: $0.5-5.0$) and a free T4 of $0.6\text{ ng/dL}$ (normal: $0.9-2.4$). A Gram stain of a sputum sample reveals normal respiratory flora with no predominant organisms. Chest radiography shows bilateral fluffy alveolar opacities, prominent hila, and cephalization of the pulmonary vessels. Which of the following is the most appropriate initial step in the management of this patient?

Match each of the following characteristic arterial pulse abnormalities observed during physical examination with its most closely associated underlying cardiovascular pathology.