The existence of the upper common pathways is not well‐established yet. This case describes atrioventricular nodal reentry tachycardia with persistent ventriculoatrial dissociation that proof of upper common pathway existence.

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Background: Many studies have shown that T-peak to T-end (TPTE) interval was associated with sudden cardiac events. Peripartum cardiomyopathy (PPCM) causes reversible left ventricle systolic dysfunction which may deteriorate into sudden cardiac death. This study aimed to evaluate beta-blocker as an antiarrhythmic agent to improve TPTE interval as a prognostic value of sudden cardiac death. Methods:A cohort experimental prospective study was performed. The PPCM was diagnosed from the emergency ward. A total of 54 cases were identified from 2014 to 2016. Thirty-four patients were followed up for further analysis. Electrocardiograms were conducted in all the patients, and TPTE interval was measured. After a followup of 6 months of beta-blocker treatment, the echocardiography and TPTE interval were measured again to obtain the repolarization heterogeneity. Results:The mean age of subjects was 32 ± 6.4 years. The mean left ventricular ejection fraction (LVEF) was 32.24±6.3%. The mean TPTE interval was 123.7 ± 28.2 ms. After 6 months of beta-blocker administration, the mean LVEF was 58.26±4.4% and the mean TPTE was 98.7 ± 39.5 ms. The paired t-test showed a significant difference between TPTE interval pre-and post-administration of beta-blocker (P value < 0.001). Conclusions:There is an improvement of TPTE in PPCM patients after 6 months of beta-blocker administration. Administration of betablocker in PPCM patients is expected to prevent sudden cardiac death in PPCM populations.

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