Rapporti fra ECG ed ematocrito: variazioni post-trasfusionali dei voltaggi di QRS e T

The influence upon the ECG of blood resistivity variations provoked by hematocrit changes has been studied in 40 patients affected by Cooley’s anemia undergoing transfusion with packed red celles. In each case two electrocardiograms (immediately before and after the transfusion) were perfomed. The voltages of the Q, R, S, and T waves and the € R, obtained by the sum of the R waves observed in all the leads, were measured in each recording. The R waves voltages fell remarkably in all the leads after the transfusion, as well as the Q waves voltages in II and III and the R, while the S wave increased in $V_6$ and the T wave did not show any post-transfuslonal change. A meaningful correlation between the variations of R and Ht was also observed particularly In the patients with Ht