<s>
A	O
right	B-Algorithm
bundle	I-Algorithm
branch	I-Algorithm
block	I-Algorithm
(	O
RBBB	B-Algorithm
)	O
is	O
a	O
heart	B-Algorithm
block	I-Algorithm
in	O
the	O
right	O
bundle	O
branch	O
of	O
the	O
electrical	B-Algorithm
conduction	I-Algorithm
system	I-Algorithm
.	O
</s>
<s>
During	O
a	O
right	B-Algorithm
bundle	I-Algorithm
branch	I-Algorithm
block	I-Algorithm
,	O
the	O
right	O
ventricle	O
is	O
not	O
directly	O
activated	O
by	O
impulses	O
travelling	O
through	O
the	O
right	O
bundle	O
branch	O
.	O
</s>
<s>
As	O
conduction	B-Algorithm
through	O
the	O
myocardium	O
is	O
slower	O
than	O
conduction	B-Algorithm
through	O
the	O
Bundle	O
of	O
His-Purkinje	O
fibres	O
,	O
the	O
QRS	B-Algorithm
complex	I-Algorithm
is	O
seen	O
to	O
be	O
widened	O
.	O
</s>
<s>
The	O
QRS	B-Algorithm
complex	I-Algorithm
often	O
shows	O
an	O
extra	O
deflection	O
that	O
reflects	O
the	O
rapid	O
depolarisation	O
of	O
the	O
left	O
ventricle	O
followed	O
by	O
the	O
slower	O
depolarisation	O
of	O
the	O
right	O
ventricle	O
.	O
</s>
<s>
Incomplete	O
right	B-Algorithm
bundle	I-Algorithm
branch	I-Algorithm
block	I-Algorithm
(	O
IRBBB	B-Algorithm
)	O
is	O
an	O
conduction	B-Algorithm
abnormality	O
in	O
the	O
right	B-Algorithm
bundle	I-Algorithm
branch	I-Algorithm
block	I-Algorithm
.	O
</s>
<s>
While	O
a	O
complete	O
RBBB	B-Algorithm
has	O
a	O
QRS	B-Algorithm
duration	O
of	O
120	O
ms	O
or	O
more	O
,	O
an	O
incomplete	O
block	O
has	O
a	O
wave	O
duration	O
between	O
110	O
and	O
120	O
ms.	O
</s>
<s>
QRS	B-Algorithm
wave	I-Algorithm
duration	O
between	O
110	O
and	O
120	O
ms.	O
</s>
<s>
S	O
wave	O
of	O
longer	O
duration	O
than	O
R	B-Algorithm
wave	I-Algorithm
or	O
greater	O
than	O
40	O
ms	O
in	O
leads	O
I	O
and	O
V6	O
.	O
</s>
<s>
Normal	O
R	B-Algorithm
wave	I-Algorithm
peak	O
time	O
in	O
both	O
V5	O
and	O
V6	O
,	O
but	O
greater	O
than	O
50	O
ms	O
in	O
V1	O
.	O
</s>
<s>
Common	O
causes	O
include	O
:	O
normal	O
variation	O
,	O
changes	O
in	O
bundle	O
branch	O
structure	O
-	O
such	O
as	O
mechanical	O
stretching	O
,	O
chest	O
trauma	O
,	O
right	O
ventricular	O
hypertrophy	O
or	O
strain	B-Algorithm
,	O
congenital	O
heart	O
disease	O
such	O
as	O
atrial	O
septal	O
defect	O
,	O
and	O
ischemic	O
heart	O
disease	O
.	O
</s>
<s>
In	O
addition	O
,	O
a	O
right	B-Algorithm
bundle	I-Algorithm
branch	I-Algorithm
block	I-Algorithm
may	O
also	O
result	O
from	O
Brugada	O
syndrome	O
,	O
pulmonary	O
embolism	O
,	O
rheumatic	O
heart	O
disease	O
,	O
myocarditis	O
,	O
cardiomyopathy	O
,	O
or	O
hypertension	O
.	O
</s>
<s>
Causes	O
for	O
incomplete	O
right	B-Algorithm
bundle	I-Algorithm
branch	I-Algorithm
block	I-Algorithm
are	O
exercise-induced	O
right	O
ventricular	O
remodeling	O
,	O
increased	O
RV	O
free	O
wall	O
thickness	O
,	O
especially	O
in	O
athletes	O
due	O
to	O
prolonged	O
endurance	O
exercise	O
.	O
</s>
<s>
The	O
criteria	O
to	O
diagnose	O
a	O
right	B-Algorithm
bundle	I-Algorithm
branch	I-Algorithm
block	I-Algorithm
on	O
the	O
electrocardiogram	B-Application
:	O
</s>
<s>
The	O
heart	B-Algorithm
rhythm	I-Algorithm
must	O
originate	O
above	O
the	O
ventricles	O
(	O
i.e.	O
,	O
sinoatrial	O
node	O
,	O
atria	O
or	O
atrioventricular	O
node	O
)	O
to	O
activate	O
the	O
conduction	B-Algorithm
system	I-Algorithm
at	O
the	O
correct	O
point	O
.	O
</s>
<s>
The	O
QRS	B-Algorithm
duration	O
must	O
be	O
more	O
than	O
100	O
ms	O
(	O
incomplete	O
block	O
)	O
or	O
more	O
than	O
120	O
ms	O
(	O
complete	O
block	O
)	O
.	O
</s>
<s>
There	O
should	O
be	O
a	O
terminal	O
R	B-Algorithm
wave	I-Algorithm
in	O
lead	O
V1	O
(	O
often	O
called	O
"	O
R	O
prime	O
,	O
"	O
and	O
denoted	O
by	O
R	O
,	O
rR	O
 '	O
,	O
rsR	O
 '	O
,	O
rSR	O
 '	O
,	O
or	O
qR	O
)	O
.	O
</s>
<s>
The	O
T	O
wave	O
should	O
be	O
deflected	O
opposite	O
the	O
terminal	O
deflection	O
of	O
the	O
QRS	B-Algorithm
complex	I-Algorithm
.	O
</s>
<s>
This	O
is	O
known	O
as	O
appropriate	O
T	O
wave	O
discordance	O
with	O
bundle	B-Algorithm
branch	I-Algorithm
block	I-Algorithm
.	O
</s>
<s>
If	O
coronary	O
arteries	O
are	O
blocked	O
,	O
an	O
invasive	O
coronary	O
angioplasty	O
may	O
relieve	O
the	O
impending	O
RBBB	B-Algorithm
.	O
</s>
<s>
Prevalence	O
of	O
RBBB	B-Algorithm
increases	O
with	O
age	O
due	O
to	O
changes	O
in	O
the	O
heart	O
's	O
conduction	B-Algorithm
system	I-Algorithm
.	O
</s>
<s>
It	O
's	O
estimated	O
up	O
to	O
11.3	O
%	O
of	O
the	O
population	O
by	O
the	O
age	O
of	O
80	O
have	O
RBBB	B-Algorithm
.	O
</s>
