**Question:** Most common cause of death in Rheumatoid Ahritis?

**Core Concept:** Rheumatoid arthritis (RA) is a chronic inflammatory disorder affecting the joints, leading to pain, swelling, and deformity. It primarily affects the small joints of hands and feet, often causing disability and affecting overall quality of life.

**Why the Correct Answer is Right:** The most common cause of death in patients with rheumatoid arthritis is cardiovascular disease (CVD), particularly atherosclerosis and its complications. The inflammation associated with RA can lead to systemic inflammation, which increases the risk of developing CVD. Furthermore, RA patients often have associated risk factors for CVD, such as obesity, hypertension, and dyslipidemia.

**Why Each Wrong Option is Incorrect:**

A. Cardiomyopathy: While RA can indirectly affect the heart due to associated risk factors, it is not the direct cause of death in most cases.

B. Pulmonary fibrosis: This is a rare complication of RA but does not account for the most common cause of death.

C. Systemic sclerosis: This is a distinct autoimmune disease characterized by fibrosis and vasculopathy, not directly related to RA.

D. Cancer: While RA patients have an increased risk of certain cancers, the most common cause of death in RA patients remains cardiovascular disease.

**Why Option D is Right:**

**Clinical Pearl:** Rheumatoid arthritis patients should receive comprehensive cardiovascular risk factor management, such as lifestyle modifications, antihypertensive medications, statins, and antiplatelet agents, to reduce the risk of CVD-related mortality.

**Correct Answer:** C (Systemic sclerosis is not the most common cause of death in RA patients).