Which is true about sinus tachycardia?
(D) All of the above > In the adult, sinus tachycardia is said to be present when the heart rate exceeds 100 beats/min. Sinus tachycardia rarely exceeds 200 beats/min and is not a primary arrhythmia; instead, it represents a physiologic response to a variety of stresses, such as fever, volume depletion, anxiety, exercise, thyrotoxicosis, hypoxemia, hypotension, or CHF. Sinus tachycardia has a gradual onset and offset. The ECG demonstrates P waves with sinus contour preceding each QRS complex. Carotid sinus pressure usually produces modest slowing with a gradual return to the previous rate upon cessation. This contrasts with the response of PSVTs, which may slow slightly and terminate abruptly. The PR interval and the presence of 1:1. AV conduction properties are AV nodal and His purkinje conduction and therefore PR interval is dramatically prolonged while sinus tachycardia remains the mechanism of Atrial activity,
Fixed PR interval
Gradual in onset
Uniform p wave
All of the above
Miscellaneous