<s>
Re-entry	B-Algorithm
ventricular	I-Algorithm
arrhythmia	I-Algorithm
is	O
a	O
type	O
of	O
paroxysmal	O
tachycardia	O
occurring	O
in	O
the	O
ventricle	O
where	O
the	O
cause	O
of	O
the	O
arrhythmia	B-Application
is	O
due	O
to	O
the	O
electric	O
signal	O
not	O
completing	O
the	O
normal	O
circuit	O
,	O
but	O
rather	O
an	O
alternative	O
circuit	O
looping	O
back	O
upon	O
itself	O
.	O
</s>
<s>
WPW	O
syndrome	O
is	O
an	O
atrioventricular	B-Algorithm
re-entrant	O
tachycardia	O
(	O
AVRT	B-Algorithm
)	O
,	O
secondary	O
to	O
an	O
accessory	O
pathway	O
that	O
connects	O
the	O
epicardial	O
surfaces	O
of	O
the	O
atrium	O
and	O
ventricle	O
along	O
the	O
AV	O
groove	O
.	O
</s>
<s>
The	O
majority	O
of	O
time	O
symptomatic	O
WPW	O
fits	O
the	O
definition	O
of	O
AVRT	B-Algorithm
(	O
Supraventricular	B-Algorithm
tachycardia	I-Algorithm
)	O
however	O
AVNRT	B-Algorithm
(	O
dual	O
AV	O
nodal	O
physiology	O
)	O
exist	O
in	O
~	O
10%	O
of	O
patients	O
with	O
WPW	O
syndrome	O
creating	O
the	O
possibility	O
of	O
spontaneous	O
atrial	O
fibrillation	O
degenerating	O
into	O
ventricular	O
fibrillation	O
(	O
VF	O
)	O
.	O
</s>
<s>
The	O
fact	O
that	O
WPW	O
patients	O
are	O
young	O
and	O
do	O
not	O
have	O
structural	O
heart	O
disease	O
,	O
lead	O
to	O
using	O
catheter	O
ablation	O
of	O
the	O
APs	O
with	O
the	O
elimination	O
of	O
the	O
atrial	O
fibrillation	O
as	O
well	O
as	O
the	O
episodes	O
of	O
re-entrant	O
ventricular	B-Application
tachycardia	I-Application
.	O
</s>
<s>
Ventricular	O
fibrillation	O
(	O
VF	O
)	O
following	O
ventricular	B-Application
tachycardia	I-Application
(	O
VT	O
)	O
may	O
be	O
described	O
as	O
a	O
functionally	O
defined	O
re-entry	O
problem	O
caused	O
by	O
multiple	O
mini	O
re-entrant	O
circuits	O
spontaneously	O
created	O
within	O
the	O
ventricular	O
myocardium	O
.	O
</s>
