CARDIAC CYCLE

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CARDIAC CYCLE

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CARDIAC CYCLE
Divisions of Ventricular Systole
ATRIAL SYSTOLE
Atrium Function as Pumps
ISOVOLUMETRIC (Isometric) CONTRACTION
RAPID EJECTION

본문내용

* CARDIAC CYCLE
Definition of Cardiac cycle
: period from beginning of one heartbeat to beginning of next

Classification of Cardiac Cycle
   i. Systole(수축기)-- a period of ventricular contraction
   ii. Diastole(이완기) -- a period of relaxation and filling
2/3 of entire cardiac cycle

*Divisions of Ventricular Systole
1. Period of Isovolumic(Isometric) Contraction.
   a. Immediately after beginning of ventricular contraction,
abrupt rises of ventricular pressure, but no emptying.
     b. AV valve closing

2. Period of Ejection(0.02-0.3sec).
     a.  rapid ejection (first 1/3)- 70% emptying
     b.  slow ejection (last 2/3) - 30% emptying.
      

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