Decrease of electrical cardiac systole

Summary A 37 year-old male, with nocturnal tachycardias and three accesses of true syncopes related to strain has familiar antecedents of two sudden deaths; his father, 55 years, for sudden cardiac death and one brother died, 22 months infant, of sudden death. In a detailed exam, we observed that the patient has a short PQ interval and a short QT (Bazett and Fridericiaʹs Formulas) with a risk of sudden cardiac death, according to the scale of Schwartz, 4.5/4 points. In the first impression, the interpretation of the EKG outline induces to think of Lown–Ganong–Levineʹs Syndrome. In a more detailed exam we observed that as the interval in this syndrome is normal, it is short in patientʹs (Short QTc-f interval). Two possibilities: an unknown variant of L–G–Lʹs Syndrome and a new syndrome. Methods Exhaustive measurements of the electrocardiographic intervals, segments and waves. Technique of measurement: MioLaserTool ® Pixruler®. Results Short PQ and QT intervals. The RR interval: 0.860 s. The QT interval: 0.29 s. Bazettʹs Formula: 0.312 s. PQ Interval: 0.10–0.11 s. Discussion An electrocardiographic pattern unknown, shortening (Decrease) of electrical cardiac systole or stimulation accelerated auricle-ventricular with precocious ventricular repolarization. Conclusions To make aware to the physicians the necessity to construct an exhaustive measurement of these parameters, in the cases those indicate pathology in the cardiac sphere.