The EKG in the patient treated with lidocaine

Electrocardiographic Findings

 * 1) Like all type 1B agents, this shortens the action potential duration
 * 2) May slow the rate or cause sinus arrest in high doses, the automaticity of ectopic atrial pacemakers may be reduced.
 * 3) In usual doses, it is not associated with any noticeable changes in the P wave, the PR interval, the QRS complex, The QT interval, or the T wave.