Cavallo’s sign is seen in –
**Core Concept**
Cavallo's sign is a clinical finding associated with tricuspid regurgitation, a valvular heart disease characterized by the retrograde flow of blood from the right ventricle to the right atrium due to a faulty tricuspid valve. This condition leads to an increased volume load on the right atrium and subsequent enlargement.
**Why the Correct Answer is Right**
The presence of Cavallo's sign is indicative of tricuspid regurgitation. Cavallo's sign is observed as a prominent 'a' wave in the jugular venous pulse (JVP) waveform, which is a result of the increased pressure and volume in the right atrium during ventricular systole. This increased pressure causes the tricuspid valve to prolapse, leading to regurgitation of blood back into the right atrium. The 'a' wave in the JVP is a consequence of this regurgitant flow.
**Why Each Wrong Option is Incorrect**
**Option B:** Mitral Stenosis is characterized by a narrow mitral valve orifice, leading to an obstruction of blood flow from the left atrium to the left ventricle. This condition does not directly affect the right heart, and therefore, Cavallo's sign is not associated with mitral stenosis.
**Option C:** Aortic Stenosis is characterized by a narrow aortic valve orifice, leading to an obstruction of blood flow from the left ventricle to the aorta. This condition primarily affects the left heart and does not directly influence the right heart, making Cavallo's sign an inappropriate diagnostic finding.
**Option D:** Aortic Regurgitation is characterized by the retrograde flow of blood from the aorta into the left ventricle due to a faulty aortic valve. This condition primarily affects the left heart and does not directly influence the right heart, making Cavallo's sign an inappropriate diagnostic finding.
**Clinical Pearl / High-Yield Fact**
Cavallo's sign is a valuable clinical finding for diagnosing tricuspid regurgitation. It is essential to recognize this sign in the context of a patient's overall clinical presentation, including symptoms such as dyspnea, fatigue, and peripheral edema.
**✓ Correct Answer: A. Tricuspid Regurgitation**