02 ECG- Cardio
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Transcript of 02 ECG- Cardio
![Page 1: 02 ECG- Cardio](https://reader030.fdocumento.com/reader030/viewer/2022032506/55c9f975bb61ebcb4f8b4626/html5/thumbnails/1.jpg)
Electrocardiografía
¿Porqué estudiar ECG en fisiología?Fundamentos biofísicosRutina de interpretaciónRitmo, frecuencia,intervalos,segmentos, eje eléctrico en plano frontalEjemplos
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Registro electrocardiográfico
D2
mV
t
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__+
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+ + + + + + + + + + + +
- - - - - - - - - - - - - - - - - - - - - - - - + + + + + + + + + + + +
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- - - - + + + +
+ + + + - - - - + + + + - - - -
- - - - + + + +
A B
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- - - - + + + +
+ + + + - - - - + + + + - - - -
- - - - + + + +
A B
+-
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Derivaciones bipolares del plano frontal
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Derivaciones monopolares del plano frontal
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0º
+30º
+60º
+90º
+120º
+150º
+180º
-150º
-120º
-90º
-60º
-30º
DI+
aVL+
DIII -
aVF-
DII-
aVR+
DI-
aVR-
DII+aVF+
DIII+
aVL-
Derivaciones del plano frontal
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Derivaciones precordiales
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Inicio y propagación inical del estímulo
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0º
+30º
+60º
+90º+120º
+150º
+180º
-150º
-120º
-90º-60º
-30º
DI+
aVL+
DIII -
aVF-DII-
aVR+
DI-
aVR-
DII+aVF+
DIII+
aVL-
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Ritmo Sinusal:
Onda P positiva en DI y aVFOndas P seguidas de QRSsIntervalo PR constante, igual o mayor a 0,12 seg (tres cuadrados chicos)Frecuencia ligéramente irregular
¿Ondas P positivas en DII son suficientes para afirmar que el vector de despolarización auricular es normal?
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Adulto joven, sin antecedentes clínicos de relevancia
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Paciente de 60 años de edad, de sexo femenino, que consulta por mareos
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Intervalo PR (comienzo onda P-comienzo QRS):
0,12 a 0,2 segundos (3-4 cuadrados chicos)
¿Porqué en el segmento P-R el potencial registrado es 0?
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Paciente de 70 años, que consulta por síncope (pérdida súbita de la conciencia y del tono postural, con recuperación espontánea)
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Registro electrocardiográfico
D2
mV
t
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Activación Ventricular
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0º
+30º
+60º
+90º+120º
+150º
+180º
-150º
-120º
-90º
-60º
-30º
DI+
aVL+
DIII -
aVF-
DII-
aVR+
DI-
aVR-
DII+aVF+
DIII+
aVL-
D2
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aVR aVL
aVF
D1
D2D3
+
++
C 0º
+90º
-180º+180º
-90º
1er Cuadrante
2º Cuadrante
3er Cuadrante
4º Cuadrante
+60º
-30º
+120º
Eje Eléctrico Plano Frontal
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Registro electrocardiográfico
D2
mV
t
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Segmento S-T
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Paciente de 65 años de edad, sexo masculino, que consulta por cuadro de dolor precordial opresivo, de 1 hora de evolución, asociado a mareos y disnea (“falta de aire”)
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Intervalo QT: comienzo QRS-final onda T.
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Adulto joven con historia de síncopes recurrentes y antecedentes familiares de muerte súbita
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Repolarización Ventricular
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Onda T
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