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 |
|
.