Which maneuver is NOT typically used for treating supraventricular tachycardia (SVT)?

The maneuver that is not typically used for treating supraventricular tachycardia (SVT) is massaging both carotid arteries. This technique, known as carotid sinus massage, can be effective in certain types of tachycardia, but it is specifically contraindicated in the treatment of SVT for patients with structural heart disease or carotid artery disease due to the risk of complications such as embolism or stroke.

On the other hand, blowing on the thumb, using ice to the face, and holding the breath while bearing down are commonly used vagal maneuvers that can help to slow down the heart rate by stimulating the vagus nerve. These methods can be effective for terminating an episode of SVT in otherwise healthy individuals, as they encourage a transient drop in heart rate through increased parasympathetic activity.