Cyanosis attributable to right to left shunt in the carcinoid syndrome

Carcinoid heart disease

Carcinoid tumors are rare, indolent neuroendocrine tumors that are often associated with a syndrome characterized by episodic flushing, secretory diarrhea, bronchospasm, and hypotension-the carcinoid syndrome. Cardiac involvement occurs in one-half to two-thirds of patients with carcinoid syndrome and is associated with a worse clinical outcome. Carcinoid heart disease is characterized by endocardial plaque-like deposits found predominantly on right-sided heart valves, leading to the combination of valvular stenosis and regurgitation. Left-sided cardiac involvement can also occur in <10% of patients. Somatostatin analogs form the therapeutic cornerstone in the medical management of these patients. Cytotoxic chemotherapy has had only limited success in the treatment of metastatic carcinoid tumors. Hepatic resection or palliative cytoreduction may be of benefit in patients with limited hepatic disease. Hepatic artery embolization is usually applied if a patient is not eligible for surgical debulking. The development and progression of carcinoid heart disease are associated with an unfavorable outcome. In those patients having severe cardiac involvement and well-controlled systemic disease, valve replacement surgery has been found to be an effective treatment that can both relieve intractable symptoms and contribute to improved clinical outcomes.

Carcinoid heart disease with severe hypoxia due to interatrial shunt through patent foramen ovale

Carcinoid heart disease occurs in approximately half of patients who have carcinoid syndrome and is the leading cause of death among these patients. It is typically manifest as right-sided valvular lesions, usually tricuspid insufficiency and pulmonary valve stenosis. This case report describes the unusual presentation of a patient with carcinoid heart disease and a large right-to-left shunt through a patent foramen ovale.