Which condition is a nonselective beta-antagonist most suitable for in preoperative settings?

In preoperative settings, a nonselective beta-antagonist is most suitable for the preparation of patients with pheochromocytoma. Pheochromocytoma is a type of tumor that secretes catecholamines (like adrenaline), leading to symptoms such as hypertension, tachycardia, and palpitations. The use of a nonselective beta-antagonist helps manage the excessive adrenergic effects caused by these catecholamines, controlling symptoms and reducing the risk of perioperative complications related to cardiovascular instability.

While beta-antagonists may also be used in hyperthyroidism to manage symptoms like tachycardia, they do not directly address the underlying hormonal imbalance and are not typically used as a standalone treatment in a preoperative context. In chronic heart failure, selective beta-1 antagonists are generally preferred due to their heart-specific effects without the bronchoconstriction associated with nonselective agents, which can worsen the condition. In acute asthma attacks, nonselective beta-antagonists should be avoided entirely since they can induce bronchoconstriction and exacerbate respiratory symptoms. Hence, the use of a nonselective beta-antagonist for patients with pheochromocytoma in a preoperative setting addresses