<s>
Junctional	B-Algorithm
tachycardia	I-Algorithm
is	O
a	O
form	O
of	O
supraventricular	B-Algorithm
tachycardia	I-Algorithm
characterized	O
by	O
involvement	O
of	O
the	O
AV	O
node	O
.	O
</s>
<s>
It	O
can	O
be	O
contrasted	O
to	O
atrial	B-Algorithm
tachycardia	I-Algorithm
.	O
</s>
<s>
It	O
is	O
a	O
tachycardia	O
associated	O
with	O
the	O
generation	O
of	O
impulses	O
in	O
a	O
focus	O
in	O
the	O
region	O
of	O
the	O
atrioventricular	B-Algorithm
node	O
due	O
to	O
an	O
A-V	O
disassociation	O
.	O
</s>
<s>
In	O
general	O
,	O
the	O
AV	O
junction	O
's	O
intrinsic	O
rate	O
is	O
40-60	O
bpm	O
so	O
an	O
accelerated	B-Algorithm
junctional	I-Algorithm
rhythm	I-Algorithm
is	O
from	O
60-100bpm	O
and	O
then	O
becomes	O
junctional	B-Algorithm
tachycardia	I-Algorithm
at	O
a	O
rate	O
of	O
>100	O
bpm	O
.	O
</s>
<s>
It	O
may	O
also	O
be	O
due	O
to	O
onset	O
of	O
acute	O
coronary	O
syndrome	O
,	O
heart	O
failure	O
,	O
conduction	O
system	O
diseases	O
with	O
enhanced	O
automaticity	B-Algorithm
,	O
or	O
administration	O
of	O
theophylline	O
.	O
</s>
<s>
On	O
an	O
EKG	O
,	O
junctional	B-Algorithm
tachycardia	I-Algorithm
exhibits	O
the	O
following	O
classic	O
criteria	O
:	O
</s>
<s>
Forms	O
of	O
junctional	B-Algorithm
tachycardia	I-Algorithm
include	O
junctional	B-Algorithm
ectopic	I-Algorithm
tachycardia	I-Algorithm
(	O
JET	O
)	O
and	O
atrioventricular	B-Algorithm
nodal	I-Algorithm
re-entrant	I-Algorithm
tachycardia	I-Algorithm
(	O
AVNRT	B-Algorithm
)	O
which	O
can	O
be	O
distinguished	O
by	O
performing	O
electrophysiological	B-Algorithm
studies	I-Algorithm
.	O
</s>
