RCIS Practice Test 2025 – All-in-One Exam Prep

In a myocardial biopsy, the primary site for obtaining tissue samples is typically the right ventricle. This practice is mainly due to the right ventricle's accessibility via the cardiac catheterization process, which allows for safer and simpler sampling without the need to involve the left ventricle, which has a thicker wall and greater risk during the procedure. Additionally, the right ventricle generally has a similar histological structure to the left ventricle, making it sufficient for diagnostic purposes.

When considering the other locations, while the left ventricle is critical for overall heart function, it is usually not chosen for biopsy due to its anatomical challenges and risk factors associated with the procedure. The right atrium could theoretically be used, but it is less common and does not provide the same level of information about myocardial health. The coronary sinus is also not a typical site for biopsy, as it functions primarily as a venous drainage system and does not provide myocardial tissue samples necessary for diagnosis. Therefore, the right ventricle emerges as the standard choice for myocardial biopsies.