During these calculations, in all derivations, P-wave duration was measured with its starting point taken as the intersection of the isoelectric line
and the starting point of the P wave.
The ST segment in the control group were within isoelectrical line considering a deflection of <0.5 mv as isoelectric and among 50 cases of IHD patients 29 cases showed ST elevation, 13 cases presented with ST depression, and rest 8 cases ST segment were within isoelectric line
One study in 2013 however suggested, "The brain may survive in deeper states of coma than the ones found during the isoelectric line
." This study was led by Florin Amzica, a neurophysiologist at Universite de Montreal.
The beginning and ending of P-waves were determined by the point of starting P-wave deflection with the isoelectric line
, and the point of ending P-wave deflection with the isoelectric line
The beginning of the P wave was defined as the point where the initial deflection of the P wave crossed the isoelectric line
, and the end of the P wave was defined as the point where the final deflection of the P wave crossed the isoelectric line
The onset of the P-wave was defined as the junction between the isoelectric line
at the beginning of the P-wave deflection and the offset of the P-wave was defined as the junction between the end of the P-wave and the isoelectric line