Which of the following chemicals or isotopes is used in cardiac ventriculography?
**Question:** Which of the following chemicals or isotopes is used in cardiac ventriculography?
A. Technetium-99m
B. Iodine-123
C. Rubidium-82
D. Methylene blue
**Core Concept:**
Cardiac ventriculography is a radiographic technique used to visualize the ventricles of the heart by injecting a contrast medium and observing the distribution and passage of the contrast agent through the ventricles.
**Why the Correct Answer is Right:**
Correct Answer: **D. Methylene blue**
Methylene blue is a direct intravenous dye that is used for cardiac ventriculography due to its properties that allow it to selectively stain the left ventricle, providing clear visualization of its anatomy and function. It is a safe and effective contrast agent in this context.
**Why Each Wrong Option is Incorrect:**
A. Technetium-99m (Option A): Technetium-99m is a radionuclide used in myocardial perfusion imaging and not specifically for ventriculography. Ventriculography requires a contrast agent that stains the heart chambers.
B. Iodine-123 (Option B): Iodine-123 is used in single-photon emission computed tomography (SPECT) imaging, but not specifically for ventriculography. It is not suitable for staining the heart chambers.
C. Rubidium-82 (Option C): Rubidium-82 is used in single-photon emission computed tomography (SPECT) imaging, particularly for myocardial perfusion studies, not for ventriculography. Ventriculography requires a specific contrast agent for staining heart chambers.
**Clinical Pearl:**
Cardiac ventriculography provides crucial information regarding ventricular function, size, and shape, which is essential for diagnosing various cardiac diseases and conditions, such as heart failure, myocardial infarction, and valvular abnormalities. This information aids in formulating an accurate diagnosis and treatment plan for the patient.