In patients with right ventricular infarctions, what should be avoided due to its effect on preload?

In patients with right ventricular infarctions, nitroglycerin should be avoided because it can decrease preload, potentially leading to hemodynamic instability. Right ventricular infarction often results in impaired filling and decreased cardiac output due to the right ventricle's compromised ability to manage venous return.

Nitroglycerin is a potent vasodilator, which reduces venous return (preload) to the heart. In the context of a right ventricular infarction, reducing preload can further compromise the already struggling right ventricle, leading to hypotension and decreased perfusion to vital organs. Maintaining adequate preload is crucial in these patients to ensure optimal cardiac output and to prevent complications associated with low blood volume in the heart.

The other options do not have the same adverse effect on preload. For instance, anticoagulation and aspirin are primarily used for preventing thromboembolic complications and do not significantly affect preload. Morphine, while it can cause some venodilation, is generally used for pain management in myocardial infarction and is not typically associated with a significant negative impact on preload in this specific context.