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One goal of the study was to identify any changes in EKG parameters associated with environmental phenol ... In women, researchers identified an association with longer QRS duration, or contraction of ...

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The rhythm is regular at a rate of 75 beats/min. A P wave occurs before each QRS complex (+) with a stable PR interval (0.20 sec). The P waves are positive in leads I, II, aVF, and V4-V6.

A faster than normal rate originating here is known as junctional tachycardia. This is a type of narrow complex tachycardia, with a narrow QRS in the ECG. Ventricle pacemaker cells have a normal rate ...