Effect of respiration of mean frontal P. QRS and T axis in normal young adults.

Deep inspiration shifted the mean frontal plane axis of P, QRS and T waves to the right in all the cases. Greater degree of shift in AP and AQRS was observed in cases where the resting axis had been 0 degrees to +30 degrees and minimum shift was observed where the resting axis was between +61 degrees to +90 degrees. Axis of the T wave though shifted to the right with deep inspiration in all the cases but there had been no statistically significant difference in the degree of shift in the three groups. In none of the case, axis changed from normal to abnormal degree.