162
SECTION II: Abnormal Wave Morphology
ABLATION OF ACCESSORY PATHWAYS
I
II
III
aVR aVL aVF V1
V2
V3
V4
V5
V6
I
II
III
aVR aVL aVF V1
V2 V3 V4
V5 V6
B
A
I
II
III
aVR
aVL
aVF V1
V2
V3
V4 V5
V6
A
I
II
III
aVR aVL aVF V1 V2
V3
V4 V5
V6
B
F I G U R E 7 . 1 1 .
Radiofrequency ablation of bundle of Kent.
A.
Before the procedure (
arrows,
delta waves).
B.
After the procedure (
arrows
, normal QRS complex).
F I G U R E 7 . 1 2 .
Radiofrequency ablation of bundle of Kent.
A.
Before the procedure (
arrows,
delta waves).
B.
After the procedure (
arrows
, normal QRS complex).
Ablation may be performed by surgical dissection or by percutaneous catheter tech-
niques, in conjunction with a diagnostic electrophysiology test in localizing the accessory
pathway. Figures 7.11A and 7.12A illustrate the typical ECG appearances of preexcitation
of the right ventricular free wall and the interventricular septum, respectively. Successful
ablation of the accessory pathways (see Figs. 7.11B and 7.12B) revealed the underlying
presence of normal QRS complexes.
