<s>
An	O
automatic	B-Algorithm
tachycardia	I-Algorithm
is	O
a	O
cardiac	B-Application
arrhythmia	I-Application
which	O
involves	O
an	O
area	O
of	O
the	O
heart	O
generating	O
an	O
abnormally	O
fast	O
rhythm	O
,	O
sometimes	O
also	O
called	O
enhanced	O
automaticity	O
.	O
</s>
<s>
These	O
tachycardias	O
,	O
or	O
fast	O
heart	B-Algorithm
rhythms	I-Algorithm
,	O
differ	O
from	O
reentrant	O
tachycardias	O
(	O
AVRT	B-Algorithm
and	O
AVNRT	B-Algorithm
)	O
in	O
which	O
there	O
is	O
an	O
abnormal	O
electrical	O
pathway	O
which	O
gives	O
rise	O
to	O
the	O
pathology	O
.	O
</s>
<s>
Most	O
automatic	B-Algorithm
tachycardias	I-Algorithm
are	O
supraventricular	B-Algorithm
tachycardias	I-Algorithm
(	O
SVT	O
)	O
.	O
</s>
<s>
It	O
is	O
important	O
to	O
recognise	O
an	O
automatic	B-Algorithm
tachycardia	I-Algorithm
because	O
the	O
treatment	O
will	O
be	O
different	O
to	O
that	O
for	O
a	O
reentrant	O
tachycardia	O
.	O
</s>
<s>
This	O
means	O
that	O
whereas	O
a	O
reentrant	O
tachycardia	O
will	O
both	O
begin	O
and	O
end	O
abruptly	O
as	O
cardiac	O
conduction	B-Algorithm
utilises	O
then	O
ceases	O
to	O
utilise	O
the	O
accessory	O
pathway	O
,	O
an	O
automatic	B-Algorithm
tachycardia	I-Algorithm
will	O
rise	O
and	O
fall	O
gradually	O
in	O
rate	O
as	O
the	O
automatic	O
focus	O
increases	O
and	O
decreases	O
its	O
automatic	O
rate	O
of	O
electrical	O
discharge	O
.	O
</s>
<s>
Sinus	B-Algorithm
tachycardia	I-Algorithm
may	O
be	O
considered	O
an	O
automatic	B-Algorithm
tachycardia	I-Algorithm
,	O
since	O
the	O
sinoatrial	O
node	O
(	O
SAN	O
)	O
is	O
discharging	O
at	O
an	O
abnormally	O
fast	O
rate	O
.	O
</s>
<s>
Atrial	B-Algorithm
ectopic	I-Algorithm
tachycardia	I-Algorithm
,	O
in	O
which	O
the	O
focus	O
or	O
foci	O
are	O
in	O
the	O
atria	O
of	O
the	O
heart	O
,	O
is	O
an	O
automatic	B-Algorithm
tachycardia	I-Algorithm
.	O
</s>
<s>
Atrial	B-Application
fibrillation	I-Application
may	O
be	O
considered	O
an	O
automatic	B-Algorithm
tachycardia	I-Algorithm
.	O
</s>
<s>
Idioventricular	O
tachycardia	O
is	O
notable	O
because	O
it	O
is	O
the	O
only	O
automatic	B-Algorithm
tachycardia	I-Algorithm
which	O
is	O
not	O
an	O
SVT	O
.	O
</s>
<s>
Treatment	O
depends	O
on	O
the	O
origin	O
of	O
the	O
automatic	B-Algorithm
tachycardia	I-Algorithm
,	O
however	O
the	O
mainstay	O
of	O
treatment	O
is	O
either	O
antidysrhythmic	B-Algorithm
medication	O
or	O
cardiac	B-Device
pacing	I-Device
.	O
</s>
<s>
Specifically	O
overdrive	O
pacing	O
may	O
be	O
used	O
for	O
all	O
forms	O
of	O
automatic	B-Algorithm
tachycardia	I-Algorithm
;	O
a	O
pacemaker	B-Device
assumes	O
control	O
of	O
the	O
heart	B-Algorithm
rhythm	I-Algorithm
in	O
overdrive	O
pacing	O
.	O
</s>
<s>
In	O
some	O
cases	O
ablation	B-Algorithm
of	O
the	O
ectopic	B-Algorithm
focus	I-Algorithm
may	O
be	O
necessary	O
.	O
</s>
