The treatment is to eliminate the underlying etiology as this rhythm disturbance always occurs secondary to a precipitating factor. Efforts to control the tachycardia without determining the etiology could potentially harm the patient. Beta-blockers may be effective in slowing the sinus node. However, if the tachycardia is due to a low cardiac output, using a b-blocker may further decrease myocardial function. In contrast, a b-blocker may be very helpful in a patient who is thyrotoxic or hypertensive. Relieving the patient's pain or anxiety may also help to resolve the sinus tachycardia once it is established that there are no correctable causes. In patients who have suffered myocardial infarction, persistent sinus tachycardia may necessitate pulmonary artery catheter placement to aid evaluation of myocardial function and volume status.
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