Carcinoid of hea presents as?
**Core Concept**
Carcinoid heart disease is a rare condition caused by the release of serotonin and other vasoactive substances from carcinoid tumors metastatic to the heart. The primary effect is fibrosis of the heart valves, particularly the tricuspid and pulmonary valves.
**Why the Correct Answer is Right**
The symptoms of carcinoid heart disease are primarily due to the fibrosis of the heart valves. The fibrosis leads to tricuspid regurgitation and pulmonary regurgitation, resulting in symptoms such as palpitations, shortness of breath, and fatigue. The mechanism of fibrosis involves the continuous release of serotonin from the carcinoid tumor, which leads to the activation of fibroblasts and the deposition of collagen in the valve tissue.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the presentation of carcinoid heart disease.
**Option B:** While carcinoid syndrome can present with flushing and diarrhea, these symptoms are not directly related to the cardiac manifestations of carcinoid heart disease.
**Option C:** Carcinoid heart disease can present with symptoms of right-sided heart failure, but it is not typically characterized by left-sided heart failure symptoms such as angina or left ventricular failure.
**Clinical Pearl / High-Yield Fact**
Carcinoid heart disease is often diagnosed incidentally on echocardiography performed for unrelated symptoms, and it is essential to consider this diagnosis in patients with unexplained heart valve disease.
**Correct Answer: C. Right-sided heart failure symptoms**