<s>
A	O
junctional	B-Algorithm
escape	I-Algorithm
beat	I-Algorithm
is	O
a	O
delayed	O
heartbeat	O
originating	O
not	O
from	O
the	O
atrium	O
but	O
from	O
an	O
ectopic	B-Algorithm
focus	O
somewhere	O
in	O
the	O
atrioventricular	O
junction	O
.	O
</s>
<s>
It	O
can	O
also	O
occur	O
following	O
a	O
premature	B-Error_Name
ventricular	I-Error_Name
contraction	I-Error_Name
or	O
blocked	O
premature	B-Algorithm
atrial	I-Algorithm
contraction	I-Algorithm
.	O
</s>
<s>
Junctional	B-Algorithm
rhythms	I-Algorithm
(	O
if	O
a	O
bradycardia	B-Algorithm
)	O
can	O
cause	O
decreased	O
cardiac	O
output	O
.	O
</s>
<s>
Therefore	O
,	O
the	O
person	O
may	O
exhibit	O
signs	O
and	O
symptoms	O
similar	O
to	O
other	O
bradycardia	B-Algorithm
such	O
as	O
lightheadedness	O
,	O
dizziness	O
,	O
low	O
blood	O
pressure	O
,	O
and	O
fainting	O
.	O
</s>
<s>
A	O
junctional	B-Algorithm
escape	I-Algorithm
complex	O
is	O
a	O
normal	O
response	O
that	O
may	O
result	O
from	O
excessive	O
vagal	O
tone	O
on	O
the	O
SA	O
node	O
(	O
e.g.	O
</s>
<s>
Rhythm	O
:	O
Irregular	O
in	O
single	O
junctional	B-Algorithm
escape	I-Algorithm
complex	O
;	O
regular	O
in	O
junctional	B-Algorithm
escape	I-Algorithm
rhythm	O
.	O
</s>
<s>
P	O
waves	O
:	O
Depends	O
on	O
the	O
site	O
of	O
the	O
ectopic	B-Algorithm
focus	O
.	O
</s>
