Hemochromatosis induced cardioniyopathy, investigation of choice is-
**Core Concept**
Hemochromatosis-induced cardiomyopathy occurs due to iron overload leading to myocardial fibrosis and dysfunction. This condition is often associated with increased levels of serum iron and transferrin saturation.
**Why the Correct Answer is Right**
The investigation of choice for diagnosing hemochromatosis-induced cardiomyopathy is a non-invasive test that measures the level of serum iron and transferrin saturation. This is because elevated levels of serum iron and transferrin saturation are hallmarks of hemochromatosis. The correct answer is a blood test that measures serum ferritin, which is a protein that stores iron in the body.
**Why Each Wrong Option is Incorrect**
* **Option A:** Echocardiogram is a useful diagnostic tool for assessing cardiac function but does not directly diagnose hemochromatosis-induced cardiomyopathy.
* **Option B:** Cardiac MRI may be used to assess myocardial iron levels, but it is not the first-line investigation for diagnosing hemochromatosis-induced cardiomyopathy.
* **Option D:** Blood tests for troponin and creatine kinase (CK) may be elevated in patients with cardiomyopathy, but they are not specific for diagnosing hemochromatosis-induced cardiomyopathy.
**Clinical Pearl / High-Yield Fact**
A key clinical feature of hemochromatosis-induced cardiomyopathy is the presence of a "heart failure" phenotype despite preserved ejection fraction on echocardiogram. This is due to diastolic dysfunction caused by myocardial fibrosis.
**Correct Answer:** C. Serum ferritin.