Final answer:
Nitroglycerin is effective in relieving pain for patients with Prinzmetal's Angina because it is a vasodilator that releases nitric oxide to relax and widen the coronary arteries, improving blood flow to the heart muscle.
Step-by-step explanation:
What may relieve pain for the patient with Prinzmetal's Angina? The options provided for treatment include nitroglycerin, rest, oxygen therapy, and morphine. Nitroglycerin is a vasodilator that works by releasing nitric oxide, which relaxes the smooth muscle in the walls of the coronary arteries, leading to dilation and increased blood flow to the heart muscle. Rest can also alleviate the symptoms by reducing the heart's oxygen demand. Oxygen therapy may help if the patient is hypoxic, but it is not a primary treatment for Prinzmetal's Angina. Morphine is typically used for pain control in other types of angina and myocardial infarction, but is not the first line of treatment for Prinzmetal's Angina. Hence, nitroglycerin is widely used for immediate relief of chest pain associated with this condition.