<s>
Double-balloon	B-Algorithm
enteroscopy	I-Algorithm
,	O
also	O
known	O
as	O
push-and-pull	B-Algorithm
enteroscopy	I-Algorithm
,	O
is	O
an	O
endoscopic	B-Application
technique	O
for	O
visualization	O
of	O
the	O
small	O
bowel	O
.	O
</s>
<s>
It	O
was	O
developed	O
by	O
Hironori	B-Algorithm
Yamamoto	I-Algorithm
in	O
2001	O
.	O
</s>
<s>
It	O
is	O
novel	O
in	O
the	O
field	O
of	O
diagnostic	O
gastroenterology	O
as	O
it	O
is	O
the	O
first	O
endoscopic	B-Application
technique	O
that	O
allows	O
for	O
the	O
entire	O
gastrointestinal	O
tract	O
to	O
be	O
visualized	O
in	O
real	O
time	O
.	O
</s>
<s>
The	O
enteroscope	O
and	O
overtube	O
are	O
inserted	O
through	O
the	O
mouth	O
and	O
passed	O
in	O
conventional	O
fashion	O
(	O
that	O
is	O
,	O
as	O
with	O
gastroscopy	B-Application
)	O
into	O
the	O
small	O
bowel	O
.	O
</s>
<s>
The	O
double-balloon	B-Algorithm
enteroscope	I-Algorithm
can	O
also	O
be	O
passed	O
in	O
retrograde	O
fashion	O
,	O
through	O
the	O
colon	O
and	O
into	O
the	O
ileum	O
to	O
visualize	O
the	O
end	O
of	O
the	O
small	O
bowel	O
.	O
</s>
<s>
Double-balloon	B-Algorithm
enteroscopy	I-Algorithm
has	O
found	O
a	O
niche	O
application	O
in	O
the	O
following	O
settings	O
:	O
</s>
<s>
Double-balloon	B-Algorithm
enteroscopy	I-Algorithm
offers	O
a	O
number	O
of	O
advantages	O
to	O
other	O
small	O
bowel	O
image	O
techniques	O
,	O
including	O
barium	O
imaging	O
,	O
wireless	O
capsule	O
endoscopy	B-Application
and	O
push	O
enteroscopy	B-Algorithm
:	O
</s>
<s>
The	O
key	O
disadvantage	O
of	O
double-balloon	B-Algorithm
enteroscopy	I-Algorithm
is	O
the	O
time	O
required	O
to	O
visualize	O
the	O
small	O
bowel	O
;	O
this	O
can	O
exceed	O
three	O
hours	O
,	O
and	O
may	O
require	O
that	O
patients	O
be	O
admitted	O
to	O
hospital	O
for	O
the	O
procedure	O
.	O
</s>
<s>
A	O
2015	O
study	O
in	O
the	O
World	O
Journal	O
of	O
Gastrointestinal	O
Endoscopy	B-Application
reported	O
that	O
:	O
"	O
Due	O
to	O
prolonged	O
procedure	O
and	O
air	O
insufflation	O
,	O
abdominal	O
pain	O
can	O
be	O
observed	O
in	O
up	O
to	O
20%	O
patients.	O
"	O
</s>
