Sunday, May 14, 2017

Sinus tachycardia

The rhythm is regular.  The rate is about 152 bpm.  The P waves are paired with a QRS complex and have the same morphology.  No ectopic beats are seen.  As the heart rate increases the P waves and the T waves tend to fuse together, as seen in leads I and III.

Usually the patients are stable with sinus tachycardia.  However, as the rate increases the ventricular filling times are shortened and the cardiac output will begin to decrease.  Sinus tachycardia is usually a symptom of something.  So look for an underlying cause such as pain, fever, hypovolemia, medications, or anxiety.

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