Which condition is NOT a suitable indication for nitrates?

Nitrates are primarily used in the management of angina due to their ability to dilate blood vessels and improve blood flow to the heart. Stable angina is often triggered by physical activity or stress and responds well to nitrates because they help relieve chest pain by decreasing myocardial oxygen demand.

Variant angina, also known as Prinzmetal's angina, is caused by coronary artery spasm. Nitrates can help alleviate the symptoms by relaxing the smooth muscle in the coronary arteries and restoring blood flow.

Unstable angina, however, is characterized by sudden, more frequent, and severe chest pain, and it may occur at rest. While nitrates can be used in the management of unstable angina to alleviate symptoms, it is not considered a first-line treatment in acute settings due to the urgency of stabilizing the patient. Instead, other medications such as antiplatelet agents and anticoagulants are often prioritized to prevent myocardial infarction.

Chronic heart failure is another area where nitrates may be beneficial, as they can help reduce preload and improve symptoms in patients with congestive heart failure. However, their use needs to be carefully monitored in this population to avoid potential hypotension.

Given these considerations, the unsuitable indication for nitrates