P wave

 <= 110 ms

 

Visible better in II and V1

PR Interval

120 – 200 ms

 

QRS Interval

100 ms

Normal axis between 0 and 90

 

QT Interval

320 – 400 ms

(use corrected QT calculator)

Q pathological

 

- wide at least 1/3 of the QRS complex

- Lasted minimum 40 ms (1 small square)

PA Interval

25 - 65 ms

(From the beginning of the P wave to the beginning of the A wave recorded on His)

AH Interval

50 – 120 ms

Conduction time between right septal low atrium and the bundle of His, through the AV node. It is measured from the beginning of the first atrial deflection to the beginning of the deflection of His, always on the catheter placed on His

H-V Interval

35 – 55 ms

Conduction time between His and peripheral ventricular myocardium. It is measured between the beginning of the His potential (catheter on His) and the earliest ventricular activation on the ECG or EGM (Electrogram endocavity) recording.

Sinoatrial conduction time

<125 ms

 

Sinus Node Recovery Time (SNRT)

<1500 ms

The corrected SNRT is determined by subtracting the patient's intrinsic rate from the recovery time. Normal values ​​are SNRT < 525 ms or <150% of baseline cycle.

Wenckebach Point

>130 bpm

A lower Wenckebach point is indicative of a dysfunction of the AV node.

Atrial effective refractory period (ERP)

 

170-340 ms

 

AV Node effective refractory period (ERP)

230-425 ms

 

Ventricular effective refractory period (ERP)

180-290 ms

 

 

 

 

 

 

 

.