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Reproducibility of two indices of apex cardiographic contractility

Reproducibility of two indices of apex cardiographic contractility

Revista de la Facultad de Ciencias Medicas Universidad Nacional de Cordoba 42(3): 3-11

We have evaluated the reproducibility of cuantitative apexocardiography using the R/dA-dt index and percent positivity of the apexocardiogram first derivative. Three patients were studied, ten times each, on alternate days by two independent investigators, and the analysis of data was performed by other investigators. To assess the interday variation we obtained the variability coefficient for each determination and compared it against Reale and Kolev's coefficient. Differences between operators was evaluated by the t student method. In patient "1" the R/dA-dt index variability was measured as 60.8 m/sec by operator "A", 58, 3m/sec by operator "B", 56.8 m/sec by interpreter "I" and 57,5 m/sec by interpreter "II" (p>0,5,n.s.). In patient "2" they were 57, 5; 55.3; 56,3 and 53,8 m/sec respectively (p>0.5; n.s.). For patient "3" they were 46.9; 48.5; 47,2 and 46 m/sec (p > 0,5; n.s.). The variability of percent positivity of the first derivative in patient "1" were 51,7%, 52.1%, 47% and 55%. For patient "2": 65,6% 62.1%, 57% and 59% and for patient "3": 57,3%, 53,1%, 55% and 50%, none of these differences being of significance (p > 0.5). The interday variability coefficient in R/dA-dt index ranged between 0.07 and 0.22; it was 0.08 to 0.18 for the percent positivity of first derivative. Both contractility indexes showed excellent reproducibility. When done on different days, by different operators, and when evaluated by different interpreters on multiple apexocardiographic tracings.

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Accession: 006315310

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PMID: 6545857

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