Question 1

A 61-year-old man presents with progressive dyspnea and fatigue. Echocardiogram shows severe aortic stenosis with valve area $0.5\mathrm{cm}^2$. He develops syncope during exercise testing. What is the most appropriate management?

Accepted Answer

Urgent aortic valve replacement. ***Urgent aortic valve replacement***
- The patient has **severe aortic stenosis** (valve area $0.5\mathrm{cm}^2$) and is highly symptomatic, indicated by **syncope during exercise**, which significantly increases the risk of sudden cardiac death.
- **Aortic valve replacement (AVR)** or TAVR is the definitive and urgent treatment required for symptomatic severe AS to alleviate symptoms and improve survival.
*Medical management*
- Medical therapy does not treat the underlying **fixed mechanical obstruction** of the aortic valve, making it ineffective for severe symptomatic AS.
- Relying solely on medical management in this scenario leads to a very poor prognosis due to the high risk of **sudden cardiac death**.
*Balloon aortic valvuloplasty*
- BAV is primarily a temporary measure, often used as a **bridge to AVR/TAVR** or in hemodynamically unstable patients, due to its high rate of restenosis.
- Given the patient is likely a surgical candidate, BAV is not considered the **definitive long-term solution** for severe AS.
*Heart transplantation*
- Heart transplantation is reserved for **end-stage heart failure** that is refractory to other medical and surgical options.
- The primary pathology (severe AS) is surgically addressable via AVR, making transplantation an **inappropriate** initial therapy.
*ICD insertion*
- Syncope in severe AS is typically due to **flow limitation** and **exertional hypotension** caused by the fixed obstruction, rather than primary ventricular tachyarrhythmias.
- Treating the underlying mechanical pathology with AVR resolves the cause of the syncope and the high risk of sudden death; therefore, an **ICD is not indicated**. [Practice more Medicine (Core Systems) questions on OnCourse]

Question 2

A 57-year-old diabetic man presents with a non-healing foot ulcer for 3 months. Ankle-brachial pressure index is 0.3. What does this indicate?

Accepted Answer

Severe arterial disease. ***Severe arterial disease***
  - An **Ankle-Brachial Pressure Index (ABPI)** of **0.3** indicates severely reduced blood flow to the lower extremities.
  - This severe reduction in arterial supply is consistent with the patient's **non-healing foot ulcer** and diabetes, a major risk factor for peripheral arterial disease.
*Normal arterial supply*
  - **Normal ABPI** values typically range from **0.90 to 1.30**, which is significantly higher than the given 0.3.
  - An ABPI of 0.3 suggests profound compromise, far from normal blood flow required for tissue healing.
*Mild arterial disease*
  - **Mild arterial disease** is generally indicated by an **ABPI between 0.70 and 0.90**.
  - An ABPI of 0.3 is well below this range, signifying much more severe impairment of arterial flow.
*Moderate arterial disease*
  - **Moderate arterial disease** corresponds to an **ABPI between 0.40 and 0.69**.
  - The patient's ABPI of 0.3 is lower than this range, indicating a more critical level of arterial obstruction.
*Venous disease*
  - The **ABPI** is a diagnostic tool primarily used to assess **arterial insufficiency**, not venous disease.
  - While venous disease can cause ulcers, an ABPI of 0.3 specifically points to significant **peripheral arterial disease** as the underlying cause. [Practice more Medicine (Core Systems) questions on OnCourse]

Question 3

A 55-year-old woman presents with progressive dyspnea and fatigue. Echocardiogram shows severe aortic regurgitation with LV end-systolic dimension 58mm and EF 48%. She is asymptomatic at rest. What is the most appropriate management?

Accepted Answer

Aortic valve replacement. ***Aortic valve replacement***  - The patient presents with **severe aortic regurgitation** and objective evidence of **left ventricular (LV) dysfunction** (EF 48% < 50%) and **LV dilatation** (end-systolic dimension 58mm > 50-55mm). These findings are Class I indications for **aortic valve replacement**, even in an asymptomatic patient.  - Surgical intervention is crucial to prevent irreversible myocardial damage and improve long-term outcomes in chronic **severe aortic regurgitation** once these thresholds for LV impairment are met. *Medical management*  - Medical management is typically reserved for patients with **mild to moderate aortic regurgitation** or those with severe AR but **preserved LV function** and no significant LV dilatation who are asymptomatic.  - It does not address the underlying mechanical defect of the **aortic valve** and will not reverse the progressive LV remodeling and dysfunction. *ACE inhibitors and monitoring*  - While ACE inhibitors can be considered for management of hypertension or symptomatic heart failure in some AR patients, they are not the definitive treatment for **severe aortic regurgitation** with established LV dysfunction.  - **Monitoring alone** is inappropriate given the significant LV remodeling and dysfunction, which necessitate surgical intervention to prevent further irreversible damage. *Exercise stress testing*  - Exercise stress testing is primarily used to unmask symptoms in **asymptomatic patients** with severe valve disease (e.g., aortic stenosis or regurgitation) and **preserved LV function** to assess their functional capacity and guide surgical timing.  - In this case, the patient already has clear echocardiographic evidence of **LV dysfunction** (EF 48%) and significant **LV dilatation** (ESD 58mm), which are direct indications for surgery, rendering stress testing unnecessary for decision-making. *Cardiac catheterization*  - **Cardiac catheterization** is primarily a diagnostic procedure performed to assess for **coronary artery disease** (CAD) in patients undergoing cardiac surgery, especially in older individuals or those with CAD risk factors.  - It is not the definitive management for **aortic regurgitation** itself but may be a pre-operative step. The primary treatment remains valve replacement. [Practice more Medicine (Core Systems) questions on OnCourse]

Question 4

A 53-year-old woman presents with progressive dyspnea and fatigue. Echocardiogram shows severe mitral regurgitation with flail posterior leaflet. LV function is normal but LV end-systolic dimension is 45mm. What is the most appropriate management?

Accepted Answer

Mitral valve repair. ***Mitral valve repair***- Repair is the preferred management for **severe primary mitral regurgitation (MR)**, especially when the mechanism is degenerative (like a **flail leaflet**), as it provides better long-term survival and preserves native annular-ventricular continuity.- Surgery is mandated because the patient is **symptomatic** (dyspnea and fatigue) and meets criteria for severe MR (along with an **LVESD of 45 mm**, which is an independent indication for surgery even in asymptomatic patients with preserved LVEF).*Medical management*- Medical management (e.g., ACE inhibitors/beta-blockers) is appropriate only for **asymptomatic patients** who do not meet surgical LV dimensional or functional thresholds.- It is **insufficient** to halt the progression or reduce mortality in symptomatic severe primary MR, which requires definitive surgical correction.*Mitral valve replacement*- Replacement is reserved for valves deemed **unrepairable** due to extensive destruction, calcification, or complex pathology.- Repair is favored because it avoids the risks associated with prosthetic valves, such as lifelong **anticoagulation** (for mechanical valves) and prosthetic valve dysfunction.*Heart transplantation*- This procedure is reserved for **end-stage heart failure** (NYHA Class III/IV symptoms) that is refractory to all other medical and surgical therapies.- The patient has **normal LV function** (preserved LVEF), making transplantation completely unnecessary and inappropriate.*Balloon valvuloplasty*- This intervention is the primary treatment for severe, pliable **mitral stenosis**, most commonly due to rheumatic disease.- It is **contraindicated** in severe MR, particularly MR secondary to leaflet prolapse or flail, as it would worsen the severity of the regurgitation. [Practice more Medicine (Core Systems) questions on OnCourse]

Question 5

A 46-year-old man presents with progressive dyspnea and fatigue. Echocardiogram shows severe mitral stenosis with valve area 0.7 cm². He is in atrial fibrillation with rapid ventricular response. What is the most appropriate initial management?

Accepted Answer

Rate control with digoxin. ***Rate control with digoxin***- Rapid ventricular rate in **atrial fibrillation** significantly reduces **diastolic filling time**, which is crucial for adequate **left ventricular filling** in severe **mitral stenosis (MS)**.- Rate control (e.g., with rate-limiting calcium channel blockers, beta-blockers, or **digoxin** in the setting of MS, especially if associated with heart failure) is the immediate priority to alleviate acute symptoms of heart failure.*Immediate cardioversion*- Cardioversion is generally postponed until the patient is properly **anticoagulated** (due to high risk of systemic **thromboembolism**) unless the patient is **hemodynamically unstable** (e.g., shock/hypotension).- In severe MS, AF often recurs due to chronic **left atrial enlargement** and high pressure, making rate control the preferred strategy over rhythm control initially.*Balloon mitral valvuloplasty*- This is the preferred definitive treatment for symptomatic severe MS but is an invasive procedure and is not appropriate as the *initial* acute management for **AF with RVR**.- A stable patient requires rate control and anticoagulation first before determining the timing of the **structural intervention** (BMV).*Mitral valve replacement*- **Mitral valve replacement (MVR)** is a major surgical procedure reserved for patients with MS who fail percutaneous **balloon mitral valvuloplasty (BMV)** or have unfavorable valve morphology.- This is not indicated as the *initial* non-invasive step to manage acute **rate complications** in a symptomatic patient.*Anticoagulation alone*- Anticoagulation is essential management for MS complicated by AF (high **thromboembolism** risk) but does not address the acute physiological cause of **dyspnea and fatigue** (the rapid heart rate).- Ignoring the **rapid ventricular response** would leave the patient vulnerable to acute circulatory deterioration and continued pulmonary congestion. [Practice more Medicine (Core Systems) questions on OnCourse]

Medicine (Core Systems) Questions

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