First pass study is primarily a good indicator of the function of which ventricle?

The first-pass study, particularly in the context of evaluating cardiac function, primarily assesses the right ventricle. This type of study involves the rapid introduction of a radiopharmaceutical into the venous system and the subsequent imaging of its transit through the heart chambers, particularly focusing on the right atrium and right ventricle.

After the radiopharmaceutical is injected, it travels to the heart, entering through the right atrium and passing into the right ventricle before being pumped into the pulmonary circulation. The first-pass technique effectively captures the dynamics of blood flow through the right side of the heart during its initial transit, making it an excellent method for assessing right ventricular function and pulmonary hemodynamics.

Meanwhile, the function of the left ventricle is typically evaluated through different methods, as it is more associated with systemic circulation and is not directly involved in the first-pass imaging of the injected radiopharmaceutical. Thus, the right ventricle is the primary focus of first-pass studies, explaining why this answer is especially relevant in a cardiology or radiopharmacy context.