New York State Basic Emergency Medical Technician (EMT-B) Practice Exam 2026 - Free EMT-B Practice Questions and Study Guide

Nitroglycerin is a medication primarily used to relieve chest pain (angina) associated with heart conditions. One of the theories regarding its mechanism of action is that it dilates the coronary arteries. This dilation improves blood flow to the heart muscle, which is often deprived of oxygen due to narrow or blocked arteries. By increasing the oxygen supply available to the heart, nitroglycerin effectively alleviates the pain associated with angina.

The action of dilating coronary arteries not only enhances blood flow but can also reduce the heart's workload by lowering the resistance against which the heart has to pump. This dual effect—improving oxygen supply and reducing demand—works synergistically to relieve the discomfort associated with chest pain.