title: Decrease of electrical cardiac systole.
abstract: 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 Fridericia's 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-Levine's Syndrome. In a more detailed exam we observed that as the interval in this syndrome is normal, it is short in patient's (Short QTc-f interval). Two possibilities: an unknown variant of L-G-L's 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. Bazett's Formula: 0.312 s. PQ Interval: 0.10-0.11 s.
  
  
  CONCLUSIONS
  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.
authors: Francisco R
authors: FR
authors: Breijo-Marquez
mesh_terms: D000328:Adult; D016757:Death, Sudden, Cardiac / Q000209:etiology; D004562:Electrocardiography / Q000379:methods; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D013599:Systole / Q000502:physiology*