Page 432 - Cardiac Nursing

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LWBK340-c18_p400-419.qxd 6/30/09 7:57 PM Page 408 Aptara Inc.
408 P A R T III / Assessment of Heart Disease

RF catheter

RF lesion site for
slow pathway
A modification / ablation

I
500 ms
II S

V1
V V
A A A A ABLp

A A ABL d

H H H HIS p

HIS 5,6
Onset of AVNRT
HIS 3,4
a
y
Fast pathway conduction, Slow pathway conduction,
t
e
r
short A-H interval long A-H interval
HIS d
RVa
Atrial pacing stimulis
S
S1 S S1 S S2
RVa d
Stim 1
S S
3:25:24 PM 3:25:25 PM 3:25:26 PM 3:25:27 PM 3:25:28 PM
CardioLab v5.1D
GE Medical Systems Information Technologies
B
■ Figure 18-3 (A) Diagram of slow pathway catheter ablation for treatment of AVNRT. (B) Intracardiac
electrograms show atrial pacing with AV conduction jumping from fast pathway to slow pathway followed by
onset of AVNRT.