I need to calculate P-R, QRS, and Q-T intervals from an ECG, but I have 4 different lines. Which do I use?

Question

I have ECG(mV), mmHg, mV, and Vol. pulse (mV.s). Which do I use?

Answer 1

use the ecg mv and u can usually use any lead but using the one with the most positive R wave is easier

Answer 2

A Wiggers diagram is a standard diagram used in cardiac physiology.

The X axis is used to plot time, while the Y axis contains all of the following on a single grid:

Blood pressure
Aortic pressure
Ventricular pressure
Atrial pressure
Ventricular volume
Electrocardiogram
Arterial flow
Heart sounds
By illustrating the coordinated variation of these values, it becomes easier to illustrate the relationship between these values in the cardiac cycle.

Please read the ECG and leave other curves if you want to measure QRS complex etc

Answer 3

One large square has five small squares. The large in one second and the small 0.2 sec. Measure from start of P to start of QRS for P-R and from start of Q to end of QRS for QRS and from end of QRS to start of T for Q-T.