Please enable JavaScript.
Coggle requires JavaScript to display documents.
Cardiac output, venous return and regulation - Coggle Diagram
Cardiac output, venous return and regulation
Definition
Venous return
the flow of blood from the periphery back to the right atrium
Cardiac reserve
the difference between resting and maximal CO
increase in CO in exercise is called cardiac reserve
CO
Amount of
blood pumped out by heart
per
minute
---- HR x SV
Stroke volume
output per ventricle
per beat
Cardiac index
the amount of blood pumped by ventricle per minute per square meter surface area of the body
EDV
volume of blood remain in the ventricle at the end of diastole
ESV
the volume of blood remaining in the ventricle at the end of systole
Determinant of Cardiac Output (3 techniques)
Fick's Method
(THE BEST)
Bellisto Cardiography
Dye Method
Factor determine cardiac output
Contractility
Preload
the degree to which myocardium stretched before it contract
Frank Starling Law
Force of contraction is proportional to initial length of cardiac muscle fibre
Heart Rate
Afterload
Factors that affect Venous return
Cardiac pump
Ventricular compliance
Total blood volume
Vis a turgo
Venous Pressure
Vis a fonte
Sympathetic tone
Pressure gradienr
Position of the body
Muscular pump
Respiratory Pump
Frank Starling
Principle
Mechanism