5 electrofisiologia 2014 i
DESCRIPTION
nociones básicas ekgTRANSCRIPT
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A n a t o
m í a f
u n c i o n a l
d e l C
o r a z ó n
S i s t e m
a a u t o
n ó m i c o
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Registro Intra-c
Registro Extra-c
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60 – 100 x’
20 – 40 x’
40 – 60 x’
2000 – 4000 mm/seg
2000 – 4000 mm/se
200 mm/seg
500 mm/segContractil
Autonom
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+ + + +
- - - -
-90 mV
+ + +
- - -
+ + ++ + +
- - -- - -
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+
+ + +-
- - -
+- Vector de despolarización
Vector de re-polarización - +
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+
+ +-
- -
+- Vector de despolarización
Vector de re-polarización - +
+
-
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+
-
+- Vector de despolarización
Vector de re-polarización - +
+
-
+
-
+
-
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+
-
+- Vector de despolarización
Vector de re-polarización - +
+
-
+
-
+
-
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(ira )uscular*C+,RAC
(ira )uscular*A1+,)CA
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ILCa
INa
IK
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ITCa → ILCa
IfNa
IK
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Registro del potencial de acción ,RAC31ARC'lula miocardica no sistema autónomo
(0
(6 (2
(7
(4
(0 despolarización
F1 muesca
F2 meseta
F1 + F2 repolarización lent
F3 repolarización ráp
F4 reposo
(6
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(0
(6 (2
(7
(4
ngreso de ,a8
• 60 ,a8/seg• Canales dependientes de :olta"eINa
(0 despolarización
F1 muesca
F2 meseta
F1 + F2 repolarización lent
F3 repolarización ráp
F4 reposo
(6
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(0
(6 (2
(7
(4
ngreso decreciente de Ca88
• ;rolonga el potencial de acción• #e 6 a 5 ms a 200 ms
3greso decreciente de < 8
• Cierre canales r&pidos < ILCaIK - rápidos
(0 despolarización
F1 muesca
F2 meseta
F1 + F2 repolarización lent
F3 repolarización ráp
F4 reposo
(6
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(0
(6 (2
(7
(4
ncremento de 3greso d• Canales lentos para el <
IK - lentos
Cesa ingreso de Ca88
(0 despolarización
F1 muesca
F2 meseta
F1 + F2 repolarización lent
F3 repolarización ráp
F4 reposo
(6 (2
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(0
(6 (2
(7
(4
#isminución de 3greso de < 8 3greso de ,a8 = Ca
(0 despolarización
F1 muesca
F2 meseta
F1 + F2 repolarización lent
F3 repolarización ráp
F4 reposo
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(6 (2
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(0
(6 (2
(7
(4
(0 despolarizaciónF1 muesca
F2 meseta
F1 + F2 repolarización len
F3 repolarización ráp
F4 reposo
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(&rmacos
(isiológico
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D!"AS ANTIAIT#ICAS
Clase #ecanismo de acción Comentario $%em
IA >. canales de sodio enlentece ?ase 0 - despolarización @u
I& >. canales de sodio acorta ?ase 7 - repolarización r&pida5 /id
IC >. canales de sodio enlentece ?ase 0 - despolarización ;ropa?
II >eta-lo%ueadores suprime ?ase 4 - reposo ;rop
III >. de canales de potasio prolonga ?ase 7 - repolarización Amiod
I' >. de canales de calcio acorta potencial de acción Vera
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(0
(6(2
(7
(4
AC
>
V
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$lectrocardio(rama
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Registro del potencial de acción 3BRAC31AR
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Registro del potencial de acción 3BRAC31AR
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Despolarizaciónauricular
Despolarización)entricular
e-polarización)entricular
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R
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(
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$)aluación del $K"
oitmoo *recuencia cardiaca
o $%e el+ctricoo#edidas
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Despolarizacionauricular
DespolarizacionNodo sinusal
EKGonda P
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DespolarizacionNodo uriculo!"en#ricular
EKGin#er$alo P%
Despolarizacion"en#ricular
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EKGcomple&o '%(
%e!polarizacion"en#ricular
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EKGin#er$alo ')
*(egmen#o () + on
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D!"AS ANTIAIT#ICAS
Clase #ecanismo de acción Comentario $%emIA >. canales de sodio enlentece ?ase 0 - despolarización @u
I& >. canales de sodio acorta ?ase 7 - repolarización r&pida5 /id
IC >. canales de sodio enlentece ?ase 0 - despolarización ;ropa?
II >eta-lo%ueadores suprime ?ase 4 - reposo ;rop
III >. de canales de potasio prolonga ?ase 7 - repolarización AmiodI' >. de canales de calcio acorta potencial de acción Vera