Page 7 - ECG dr shamol_Slide

Voltage

Standard voltage of ECG recoding is 1mv

1mv = 10 mm / 10 small square / 2larg square

Before interpreting the ECG first look for the
•voltage is 2 large square or not

•If voltage is 1 large square/ 5 small square then the ECG

is half voltage ECG

•Then voltage of P_QRST will Actually be double of what

are u seeing