Carcinoid Syndrome Cardiac Valve Involvement
Carcinoid syndrome is characterized by the release of vasoactive substances, such as serotonin, from neuroendocrine tumors. These substances circulate in the bloodstream and can affect various organs, including the heart.
Understanding Cardiac Impact
The cardiac manifestations of carcinoid syndrome predominantly involve the right-sided heart valves. This is because the vasoactive substances released into the portal circulation are typically metabolized by the lungs before reaching the systemic circulation.
- Substances reaching the right heart can lead to plaque-like fibrous thickening and retraction of the valve leaflets.
- This process primarily affects valves exposed to the higher concentration of these substances.
Most Affected Valve
The Tricuspid valve is the most commonly affected valve in carcinoid syndrome. Its location between the right atrium and the right ventricle means it is directly exposed to the circulating vasoactive substances from the tumor.
While the Pulmonary valve can also be affected due to its position downstream in the right ventricular outflow tract, the Tricuspid valve involvement is more frequent and often more severe.
Left-sided valves (Aortic and Mitral) are much less commonly affected, as the lungs effectively filter out a significant portion of the harmful substances before they reach the left side of the heart.
Therefore, the Tricuspid valve is identified as the most common valve involved in Carcinoid syndrome.
Important Questions from General Clinical Conditions
- The height of the Jugular Venous Pulse is determined by :
- The SA node is situated at the junction of:
- Reverse splitting of second heart sound is most commonly seen in :
- A 70-year-old man with dyspnoea on exertion has been found to have a single second heart sound and a loud diamond-shaped, rough quality systolic murmur best heard at the right $2^{nd}$ intercostal space, radiating to the right carotid artery. Which one of the following is the likely diagnosis ?
Consider the following statements with regard to pulmonary embolism :
1. Unexplained breathlessness is the most common symptom.
2. When congestive heart failure or pneumonia fail to improve despite standard medical treatment, occult pulmonary embolism should be considered.
3. Patients with high clinical likelihood of venous thromboembolism should first undergo D-dimer testing alone without obligatory imaging tests.
Which of the statements given above are correct?
