Cardiology · Valvular Heart Disease
The facts most likely to be tested
Rheumatic heart disease is the most common cause of tricuspid stenosis worldwide, almost always occurring in conjunction with mitral stenosis.
The classic physical exam finding is a diastolic rumble heard best at the left lower sternal border that increases in intensity with inspiration.
Hepatic congestion, hepatomegaly, and ascites are common clinical manifestations due to chronic elevated right atrial pressure.
The jugular venous pulse tracing characteristically shows a prominent 'a' wave due to forceful atrial contraction against a stenotic valve.
Transthoracic echocardiography is the diagnostic test of choice to confirm the diagnosis and quantify the mean pressure gradient across the valve.
Patients with tricuspid stenosis typically present with peripheral edema and fatigue rather than the pulmonary symptoms seen in left-sided valvular disease.
Surgical intervention, such as valve replacement or commissurotomy, is reserved for patients who remain symptomatic despite diuretic therapy.
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A 42-year-old woman with a history of untreated childhood pharyngitis presents to the clinic with progressive abdominal swelling and lower extremity edema. Physical examination reveals a distended jugular venous pulse with a prominent 'a' wave. Auscultation demonstrates a diastolic rumble at the left lower sternal border that becomes louder during inspiration. There is palpable hepatomegaly and mild ascites. A concurrent mid-diastolic murmur is also noted at the apex.
What is the most likely diagnosis?
Tricuspid stenosis
The combination of a diastolic rumble that increases with inspiration (Carvallo's sign) and signs of right-sided heart failure (ascites, hepatomegaly) in a patient with a history of rheumatic fever is pathognomonic for tricuspid stenosis.
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High yield triage
Etiology / Epidemiology
Almost exclusively rheumatic heart disease; often associated with mitral stenosis. Rare in isolation.
Clinical Manifestations
Right-sided heart failure symptoms; opening snap and mid-diastolic rumble increasing with inspiration.
Diagnosis
Transthoracic echocardiogram is the gold standard; mean pressure gradient >5 mmHg indicates significant stenosis.
Treatment
Diuretics for symptom relief; percutaneous balloon valvuloplasty is the treatment of choice for severe cases.
Prognosis
Poor if untreated; leads to systemic venous congestion and chronic liver/renal dysfunction.
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Epidemiology & Etiology
Tricuspid stenosis is predominantly a sequela of rheumatic heart disease, typically occurring in women with concomitant mitral or aortic valve involvement. Non-rheumatic causes include carcinoid heart disease, congenital malformations, or large right atrial myxomas. It is rarely an isolated finding in clinical practice.
Pertinent Anatomy
The tricuspid valve separates the right atrium from the right ventricle. Stenosis creates a mechanical obstruction to diastolic filling, leading to elevated right atrial pressures and systemic venous backup.
Pathophysiology
Obstruction at the tricuspid valve causes a pressure gradient between the right atrium and right ventricle. This leads to right atrial enlargement and elevated central venous pressure. The resulting systemic venous congestion manifests as hepatomegaly, ascites, and peripheral edema, while cardiac output remains fixed or diminished.
Clinical Manifestations
Patients present with signs of right-sided failure, including peripheral edema, ascites, and hepatomegaly. The classic auscultatory finding is a mid-diastolic rumble heard at the left lower sternal border that intensifies with inspiration (Carvallo's sign). A prominent opening snap may be present. Jugular venous distension with a prominent 'a' wave is a key physical exam finding.
Diagnosis
Transthoracic echocardiogram is the diagnostic test of choice to visualize valve morphology and calculate the mean pressure gradient. A mean gradient >5 mmHg is generally considered hemodynamically significant. Cardiac catheterization is reserved for cases where echo findings are equivocal.
Treatment
Management focuses on symptom control with diuretics to reduce systemic venous congestion. For symptomatic patients with severe stenosis, percutaneous balloon valvuloplasty is the preferred intervention. Surgical valve replacement is indicated if valvuloplasty is unsuccessful or if there is concomitant severe tricuspid regurgitation.
Prognosis
Long-term outcomes depend on the severity of associated valvular lesions. Systemic venous congestion can lead to cardiac cirrhosis and chronic renal impairment. Patients require regular echocardiographic monitoring to assess for progression of valve area and pressure gradients.
Differential Diagnosis
Mitral stenosis: diastolic rumble does not increase with inspiration
Constrictive pericarditis: features Kussmaul's sign and pericardial knock
Right atrial myxoma: mimics stenosis but is a mobile mass
Carcinoid heart disease: usually associated with tricuspid regurgitation
Ebstein anomaly: associated with tricuspid regurgitation and displaced leaflets