What is the first-line medication class for treating sinus tachycardia?

The first-line medication class for treating sinus tachycardia is beta blockers. These medications work by blocking the effects of adrenaline on the beta-adrenergic receptors in the heart, which leads to a decrease in heart rate and contractility. This reduction in heart rate is particularly beneficial in conditions where the heart is beating too quickly, as it can help restore a more normal rhythm and improve hemodynamic stability.

Beta blockers are often preferred for managing sinus tachycardia because they not only slow the heart rate but also have a calming effect on the heart's electrical conduction system. This makes them effective in treating various conditions that can lead to elevated heart rates, such as anxiety, hyperthyroidism, and certain cardiac conditions.

While other classes of medications, such as calcium channel blockers, can also be used in certain situations, beta blockers are typically the first choice in cases of sinus tachycardia due to their specific ability to effectively target the underlying sympathetic stimulation that often causes this condition.