Ch 9.4B -- Cardiac Output and Its Control -- VTPP 435

Ch 9.4B -- Cardiac Output and Its Control -- VTPP 435

Heart Failure (HF)

-inability of cardiac input to keep pace with body's demands for supplies & removal of wastes
-systolic HF and diastolic HF

2 Main Causes of Systolic HF

1) damage fo heart muscle from heart attack or bad circulation to heart
2) prolonged pumping against chronically increased afterload

Congestive HF (CHF)

-blood continues to clog up venous system
-can be forward or backward

Forward Failure

-heart fails to pump enough blood forward to tissues
-due to SV becoming smaller

Backward Failure or Congestive HF

-occurs with Forward Failure and blood can't pump out all blood returned to it

Pulmonary Edema

-excess tissue fluid in lungs
-caused by backward failure
-blood dams up lungs
-reduces O2 and CO2 exchange

Diastolic HF or Heart Failure with Preserved EF

-blood pumps all blood out, but does not fill enough before it contracts
-has forward and backawrd