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  #1  
Old 01-30-2015
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Default CHF - Preload, Afterload, and Contraction

Hey ... can someone please verify this is correct. I heard there are these types of question on the CK ... Thanks

Preload - Up

Afterload - Down

Contraction - Down
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Old 01-30-2015
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Quote:
Originally Posted by thomasfx10 View Post
Hey ... can someone please verify this is correct. I heard there are these types of question on the CK ... Thanks

Preload - Up

Afterload - Down

Contraction - Down
I would agree.
Preload increased cause the force of contraction is not proportional to end dyastolic sarcomere lenght (heart is not pumping what is coming from venous return)
afterload down - no contraction force
contraction down

if any corrections please comment
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thomasfx10 (01-30-2015)
  #3  
Old 02-02-2015
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Default

CHF
preload increases,
afterload increases,
contractility decreases,

increase in venous return from systemic vasoconstiction(reflex to decreased cardiac output) and volume retention increase preload,
vasoconstriction increases systemic vascular resistance which increases afterload.
but LV function is impaired so heart is not able to pump well which decreases contractility

based on this mechanism treatment is given
diuretics decreases preload
ACEI decreases preload and afterload
inotropes increase contractility.

Quote:
Originally Posted by drpisho View Post
I would agree.
Preload increased cause the force of contraction is not proportional to end dyastolic sarcomere lenght (heart is not pumping what is coming from venous return)
afterload down - no contraction force
contraction down

if any corrections please comment
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The above post was thanked by:
thomasfx10 (02-02-2015)



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