Aortic Regurgitation (B)
The most likely diagnosis is aortic regurgitation (B). This patient presents with the classic constellation of findings that are pathognomonic for significant aortic regurgitation: collapsing (water-hammer) pulse, wide pulse pressure, early diastolic murmur at the left sternal border, and pistol-shot sounds over the femoral arteries 1.
Clinical Reasoning
The clinical presentation provides multiple specific physical examination findings that directly point to aortic regurgitation:
- Collapsing pulse: This is a hallmark sign of significant AR, reflecting the rapid runoff of blood from the aorta back into the left ventricle during diastole
- Wide pulse pressure: Results from elevated systolic pressure (increased stroke volume) and low diastolic pressure (regurgitant flow back into LV)
- Early diastolic murmur at left sternal border: This is the classic auscultatory finding of AR, heard best along the left sternal border with the patient leaning forward
- Pistol-shot femoral sounds: These peripheral vascular signs (also called Traube's sign) are specific for significant AR
The symptoms of dyspnea on exertion, orthopnea, and paroxysmal nocturnal dyspnea indicate that the AR has progressed to cause heart failure, representing at least Stage C chronic AR 2.
Why Other Options Are Incorrect
Coarctation of aorta (A) would present with upper extremity hypertension, differential blood pressures between arms and legs, and a systolic murmur over the back—none of which are described here.
Cardiac tamponade (C) presents with Beck's triad (hypotension, muffled heart sounds, jugular venous distension), pulsus paradoxus, and would not produce a diastolic murmur or the peripheral vascular signs described.
Ventricular septal defect (D) produces a holosystolic murmur at the left sternal border, not an early diastolic murmur, and would not cause the characteristic peripheral pulse findings of AR.
Clinical Implications
This 33-year-old patient with symptomatic severe AR requires urgent evaluation with transthoracic echocardiography to assess 1, 3:
- Severity of AR (vena contracta, regurgitant volume, regurgitant fraction)
- LV size and systolic function
- Etiology of AR (valve morphology, aortic root dimensions)
Given the presence of heart failure symptoms (orthopnea, PND), this patient likely requires surgical intervention 2. The 2020 ACC/AHA guidelines indicate that symptomatic patients with severe AR should undergo aortic valve replacement, as medical therapy alone cannot adequately manage symptomatic severe AR and outcomes worsen significantly without surgical correction.
The early diastolic murmur combined with the peripheral vascular signs (collapsing pulse, wide pulse pressure, pistol-shot sounds) creates a clinical picture with extremely high pre-test probability for severe AR 3. These physical examination findings should prompt immediate echocardiographic evaluation and cardiology consultation.