Bigeminal Rhythm Ix

Bigeminal rhythm VII.

Figure 1. Electrocardiogram recorded 14 hours after admission. See text for explication. An earlier electrocardiogram recorded immediately after admission had a sinus rate of 92 beats/min and Wolff-Parkinson-White type preexcitation on all beats. A 57-year-old woman with a history of high blood pressure and dyslipidemia presented to the emergency department with chest pain, palpitations, dyspne...

Bigeminal rhythm IV.

rhythm with each early complex having a wide QRS. Although the wide QRS superficially suggests that this is ventricular bigeminy, the perfect right-bundle-branchblock pattern (RS in lead I, qRS in lead V6, rsR ́ in lead V1) suggests that the early complex is an aberrantly conducted supraventricular complex. The atrial rhythm is typical counterclockwise atrial flutter with negative P waves in lea...

Active vs passive rhythms as an explanation of bigeminal rhythm with similar P waves.

We describe the criteria for differential diagnosis between 3:2 sinoatrial block from atrial bigeminy due to an ectopic focus in the sinus or parasinus zone. In the 3:2 sinoatrial block the RR interval of the basic rhythm is similar to the short R-R interval of the paired rhythm. In atrial bigeminy, the R-R interval of the basic rhythm is similar to the long R-R interval of the paired rhythm.

IX. Biomechanics

Factors Modifying Cyclopropane-Epinephrine Cardiac Arrhythmias

WE HAVE reported that the minimal cardiac arrhythmia due to epinephrine in cyclopropane-anesthetized dogs is a coupled, usually bigeminal rhythm which exhibits a remarkably constant interval between the normal and the abnormal beats. This arrhythmia is elicited only by the simultaneous presence of a sympathomimetic amine with cardiac actions and a critical systemic blood pressure, which is char...