gasto cardíaco Flashcards

1
Q

gasto cardíaco

A

volumen de sangre que expulsa el ventrículo izquierdo hacia la aorta minuto

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2
Q

fórmula

A

FC (latidos por minuto) * Volumen latido (litros por latido)

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3
Q

frecuencia cardiaca adulto

A

75 lpm

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4
Q

volumen sistólico adulto reposo

A

70ml

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5
Q

inferior a 60 lpm

A

bradicardia

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6
Q

arriba 100 lpm

A

taquicardia

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7
Q

factores que modifican el VS

A

precarga, fuerza de contracción, poscarga

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8
Q

precarga

A

fuerza de contracción miocárdica - retorno venoso - depende:
- duración de la DV
- presión venosa

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9
Q

fuerza de contracción / contractibilidad miocárdica

A

fuerza con la que el músculo cardíaco se contrae:
- factores intrínsecos
- factores extrínsecos - SNV

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10
Q

SNS

A

inerva fibras miocárdicas auriculares y ventriculares

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11
Q

SNP

A

inerva el miocardio auricular y en menor grado el ventricular
disminución 20 - 30%

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12
Q

Poscarga

A

aumento reduce el VS, y permanece más sangre en los ventrículos al final de la diástole

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13
Q

factores que modifican la frecuencia cardíaca

A
  • SNA
  • regulación química
  • edad, género y temperatura corporal
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14
Q

SNA

A

impulsos del centro cardiovascular
- fibras simpáticas aumentan FC
- fibras parasimpáticas disminuyen FC

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15
Q

regulación química

A
  • hormonas suprarrenales: norepinefrina y epinefrina
  • cambios iónicos: Na, Ca, K
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