<s>
Atrial	B-Algorithm
tachycardia	I-Algorithm
is	O
a	O
type	O
of	O
heart	B-Application
rhythm	I-Application
problem	I-Application
in	O
which	O
the	O
heart	O
's	O
electrical	O
impulse	O
comes	O
from	O
an	O
ectopic	B-Algorithm
pacemaker	I-Algorithm
(	O
that	O
is	O
,	O
an	O
abnormally	O
located	O
cardiac	B-Algorithm
pacemaker	I-Algorithm
)	O
in	O
the	O
upper	O
chambers	O
(	O
atria	O
)	O
of	O
the	O
heart	O
,	O
rather	O
than	O
from	O
the	O
sinoatrial	O
node	O
,	O
the	O
normal	O
origin	O
of	O
the	B-Algorithm
heart	I-Algorithm
's	I-Algorithm
electrical	I-Algorithm
activity	I-Algorithm
.	O
</s>
<s>
As	O
with	O
any	O
other	O
form	O
of	O
tachycardia	B-Application
(	O
rapid	B-Application
heart	I-Application
beat	I-Application
)	O
,	O
the	O
underlying	O
mechanism	O
can	O
be	O
either	O
the	O
rapid	O
discharge	O
of	O
an	O
abnormal	O
focus	O
,	O
the	O
presence	O
of	O
a	O
ring	O
of	O
cardiac	O
tissue	O
that	O
gives	O
rise	O
to	O
a	O
circle	O
movement	O
(	O
reentry	O
)	O
,	O
or	O
a	O
triggered	O
rapid	O
rhythm	O
due	O
to	O
other	O
pathological	O
circumstances	O
(	O
as	O
would	O
be	O
the	O
case	O
with	O
some	O
drug	O
toxicities	O
,	O
such	O
as	O
digoxin	O
toxicity	O
)	O
.	O
</s>
<s>
Forms	O
of	O
atrial	B-Algorithm
tachycardia	I-Algorithm
(	O
ATach	O
)	O
include	O
multifocal	B-Algorithm
atrial	I-Algorithm
tachycardia	I-Algorithm
(	O
MAT	O
)	O
,	O
focal	O
atrial	B-Algorithm
tachycardia	I-Algorithm
and	O
atrial	O
flutter	O
.	O
</s>
<s>
Paroxysmal	B-Algorithm
atrial	I-Algorithm
tachycardia	I-Algorithm
(	O
PAT	O
)	O
is	O
an	O
episode	O
of	O
arrhythmia	B-Application
that	O
begins	O
and	O
ends	O
abruptly	O
.	O
</s>
<s>
Atrial	B-Algorithm
tachycardia	I-Algorithm
tends	O
to	O
occur	O
in	O
individuals	O
with	O
structural	O
heart	O
disease	O
,	O
with	O
or	O
without	O
heart	O
failure	O
,	O
and	O
ischemic	O
coronary	O
artery	O
disease	O
.	O
</s>
<s>
However	O
,	O
focal	O
atrial	B-Algorithm
tachycardia	I-Algorithm
often	O
occurs	O
in	O
healthy	O
individuals	O
without	O
structural	O
heart	O
disease	O
.	O
</s>
<s>
A	O
study	O
noted	O
10	O
to	O
15%	O
of	O
patients	O
presenting	O
for	O
supraventricular	B-Algorithm
tachycardia	I-Algorithm
(	O
SVT	O
)	O
ablation	O
had	O
atrial	B-Algorithm
tachycardia	I-Algorithm
.	O
</s>
<s>
Initial	O
management	O
of	O
focal	O
atrial	B-Algorithm
tachycardia	I-Algorithm
should	O
focus	O
on	O
addressing	O
underlying	O
causes	O
:	O
treating	O
acute	O
illness	O
,	O
cessation	O
of	O
stimulants	O
,	O
stress	O
reduction	O
,	O
appropriately	O
managing	O
digoxin	O
toxicity	O
,	O
or	O
chronic	O
disease	O
management	O
.	O
</s>
<s>
If	O
atrial	O
tachyarrhythmia	B-Application
persists	O
and	O
the	O
patient	O
is	O
symptomatic	O
,	O
the	O
patient	O
may	O
benefit	O
from	O
class	O
IA	O
,	O
IC	O
,	O
or	O
class	O
III	O
antiarrhythmics	O
.	O
</s>
<s>
Catheter	O
ablation	O
of	O
focal	O
atrial	B-Algorithm
tachycardia	I-Algorithm
may	O
be	O
appropriate	O
in	O
patients	O
failing	O
medical	O
therapy	O
.	O
</s>
<s>
A	O
European	O
study	O
of	O
young	O
males	O
applying	O
for	O
pilot	O
licenses	O
demonstrated	O
that	O
0.34	O
%	O
had	O
asymptomatic	O
atrial	B-Algorithm
tachycardia	I-Algorithm
and	O
0.46	O
%	O
had	O
symptomatic	O
atrial	B-Algorithm
tachycardia	I-Algorithm
.	O
</s>
