Oreto, G. and Arrigo, F. and Mangano, A. and Consolo, S. and Luzza, F. and Canfora, G. and Coglitore, S. (1980) Rapporti fra ECG ed ematocrito: variazioni post-trasfusionali dei voltaggi di QRS e T. Accademia Peloritana dei Pericolanti Classe scienze medico - biologiche, 68. pp. 385-396.
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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<30. These electrocardiographic changes have ben interpreted as due to hematocrit variations, according to Brody’s theory. It is well known that the cardiac forces transmission is affected by highly conductive intracavitary blood, which Increases the transmlssion of the radial forces and decreases that of the tangential ones (Brody effect). The blood resistivity increase induced by the post-transfusional Ht change diminishes then the left ventricular forces (R waves), radially di rected, and increases the right ventricular ones (S waves in lead $V_6$), tangentially directed.
|Subjects:||M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Fisiche, Matematiche e Naturali > 1980
M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Medico-Biologiche > 1980
M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Giuridiche, Economiche e Politiche > 1980
M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Lettere, Filosofia e belle Arti > 1980
|Depositing User:||Dr M P|
|Date Deposited:||28 Dec 2012 11:48|
|Last Modified:||28 Dec 2012 11:48|
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