A 62-year-old male is admitted with fever, cough and chest pain and found to have pneumonia. On days 2, he complains of palpitations associated with anxiety. The nurse reports the patient’s blood pressure is 140/80 mm Hg and a heart rate of 160 beats/minute. ECG demonstrated atrioventricular nodal reentry tachycardia. You decided to use some maneuvers before treating him with medications. Of the following, which maneuver is beneficial for atrioventricular nodal reentry tachycardia (AVNRT) reversal to normal sinus rhythm?
