Fig. 1
Calculation of the right spatial peaks QRS-T angle (RtSPQRS-T angle) and the right root mean square QRS (RtRMSQRS). 0.1 mV × 40 ms = 1 little box. SV5 = Swave maximum deviation from baseline (negative number). QRSmaxII: QRS maximum deviation from baseline (positive or negative number) RV1: Rwave maximum deviation from baseline (positive number). RtRMS-QRS= \( \sqrt{SV{5}^2+{QRSmaxII}^2+{\left(-0.5\ast RV1\right)}^2\ } \)= \( \sqrt{-0.6{mV}^2+{\left(-0.4 mV\right)}^2+{\left(-0.5\ast 0.2 mV\right)}^2} \) = 0.73 mV. RtRMST=\( \sqrt{TV{5}^2+{TII}^2+{\left(-0.5\ast TV1\right)}^2\ } \) = \( \sqrt{0.3{mV}^2+0.2{mV}^2+{\left(-0.5\ast -0.2 mV\right)}^2} \) = 0.37 mV. RPD- angle= cos−1([(SV5∗TV5) + (QRSmaxII∗TII) − 0.5(RV1∗TV1)]/RtRMSQRS∗RtRMST) =cos−1([(−0.6mV∗0.3mV) + (−0.4mV∗0.2mV) − 0.5(0.2mV∗ − 0.2mV)]/0.73 mV∗0.37 mV) = 172.4 degrees