Sinus Tachycardia 

Sinus Tachycardia

A rapid heartbeat generated by discharge of the sinus node. The rate is generally 100 to 180 beats/ min in the adult, greater than 200 beats/ min in an infant and 140 to 200 beats/ min in a child. Mosby (2009-02-11).


Rate 101-180 BPM
Rhythm Regular
P-Waves Uniform in appearance; upright in lead 2. Proceeds each QRS. At a very fast rate it may be difficult to distinguish a P wave from a T wave
PR Interval 0.12 sec-0.20 sec (3-5 boxes) and constant from beat to beat
QRS Duration 0.11 sec (Almost 3 boxes) or less


Monitor Diagnostic 12 lead 

Oxygen 15 LPM NR Mask 

IV 18g AC

Fluid Replacement NS 

Pain Relief


Noticeable by: 

Looks much like normal sinus rhythm except that it is faster. At very fast rates it may be hard to tell the difference between a P wave and T wave. 

© Matt Dillard 2012