title: [Increased QRS voltage during dehydrating].
abstract: OBJECTIVE
  To assess QRS voltage changes with lower total amount of biological fluids under ultrafiltration during hemodialysis.
  
  
  METHODS
  The study included 14 patients with chronic renal failure. An average of 2.5 +/- 0.24 liters of fluid were removed during a session. 12-lead standard ECG was continuously recorded by means of a computer-aided cardiac recorder throughout the session of hemodialysis. Changes in the amplitude of QRS waves were analyzed in each lead.
  
  
  RESULTS
  Elevated QRS voltage was most pronounced in the anterior chest leads (v1-v4). Moreover, the potentials corresponding to the propagation of a predominant excitation front over the cardiac surface facing both the anterior chest wall--QRS+ (R wave) and the posterior chest wall--ORS-(S or Q waves) increased in most cases. Voltage changes in these leads were observed in 90% of patients, the amplitude of the waves being increased by more than 0.5 mV.
  
  
  CONCLUSIONS
  During dehydration, lower chest tissue electroconductivity may cause a considerable increase in QRS voltage. This should be kept in mind while analyzing ECG data during both a session of hemodialysis and antihypertensive therapy resulting in some fluid loss, as well as in the treatment of cardiac and renal failure, leading to diminished concomitant edemas.
authors.forename: M M
authors.initials: MM
authors.lastname: Saltykova
authors.forename: O Iu
authors.initials: OIu
authors.lastname: At'kov
authors.forename: E K
authors.initials: EK
authors.lastname: Karlin
authors.forename: A Iu
authors.initials: AIu
authors.lastname: Zaruba
authors.forename: A A
authors.initials: AA
authors.lastname: Dmitriev
authors.forename: V V
authors.initials: VV
authors.lastname: Kukharchuk
mesh_terms: D015314:Dialysis Solutions / Q000737:chemistry*; D004562:Electrocardiography; D005260:Female; D006321:Heart / Q000503:physiopathology*; D006329:Heart Conduction System / Q000502:physiology; D006801:Humans; D007676:Kidney Failure, Chronic / Q000097:blood / Q000503:physiopathology / Q000628:therapy; D008297:Male; D008875:Middle Aged; D011188:Potassium / Q000097:blood; D006435:Renal Dialysis / Q000379:methods
chemical_list: D015314:Dialysis Solutions; D011188:Potassium