Perfusion
refers to the flow of blood through arteries and capillaries, delivering nutrients and oxygen to cells.
Central Perfusion
Force of blood movement is generated by cardiac output
Requires adequate cardiac function, blood pressure and blood volume
Cardiac output (CO)
CO = Stroke Volume x Heart Rate
Stroke volume
volume of blood ejected from the left ventricle with each heartbeat
HR= Beats/min
After-load reflects the amount of resistance the ventricles have to contract against - also known as SVR( systemic vascular resistance)
An increase in after-load results in a decrease of stroke volume
Peripheral Tissue or Local Perfusion
Volume of blood that flows to target Tissues
pressure generated from each myocardial contraction supplies blood to peripheral vascular system
Valve in each vein keeps blood flowing in direction toward hear
Athrosclerosis
Atheromas interfere with the absorption of nutrients by the endothelial cells that compose the vessel lining and obstruct blood flow
Arteriosclerosis
is a thickening and loss of elasticity and hardening of the arterial wall
Impaired central perfusion
Occurs when cardiac output is inadequate
Perfusion Risk Factors
Modifiable:
non-modifiable:
Assessment
-baselines history
problem-focused history
Common diagnostic tests for heart
-Cardiac Stress test
(exercise or pharmacological test)
Laboratory Tests
Tests for Coagulability
Troponin
Complex of three regulatory proteins integral for muscle contraction
Troponin I-used for myocardial damage
C-reactive protein
- Treatment to lower levels include: aspirin, smoking cessation, exercise, lipid lowering agents, Omega-3,
Homocystein
SERUM LIPIDS **
Triglycerides ( <150 mg/dl )
HDL ( 40-60 mg/dl) GOOOD
LDL ( <100) BADDDD
TC (<200) total cholesterol
Risk Factors= smoking , low HDL, family history of premature CHD and age
Electrocardiogram (EKG)
PQRST wave forms to asses cardiac function
-deviations form normal sinus rhythm can indicate heart abnormalities
Holter monitoring
Echocardiogram
Ultrasound of heart structures, size, blood flow and ejection fraction
Ejection fraction
Percentage of blood volume that is ejected during systole
Normal : >55%
provides information about the left ventricle function
Trans-esophageal Echocardiography (TEE)
Exercise Stress Test
Stress Echo
Nuclear Stress Test