CVP Unit 3 Flashcards
The amount of blood pumped into the aorta each minute by the heart is called?
Cardiac output
CO=VR also CO=SVxHR Stands for?
CO- cardiac output= venous return VR CO- cardiac output= stroke volume SVx heart rate HR
The quantity of blood flowing from the veins in the right atrium is called
Venous return
CO= equals?
VR venous return
What are the factors that influence the VR?
Body metabolism Age Body size Gender
How does body metabolism influence VR and CO?
Local flow and autoregulation
VR is the summation of all local _____?
Blood flows
How does gender influence VR?
Men- resting heart rate is 5.6l/m Women 4.9l/m Average 5l/m
Factors affecting HR include-
Autonomic innervation Hormones Fitness level Age
Factors affecting SV include?
Heart size- hypertrophy Fitness Gender Contractility Duration of contractions Preload and afterload
The cardiac index rises rapidly at what age?
10
What does the declining of the cardiac index indicate?
That cardiac output is regulated by metabolic activity- decline is indicative of the declining activity- muscle mass and age.
The CO will match the VR through the use of which mechanisms?
Frank Starlings mechanism Bainbridge reflex SA node stretch
When increased quantities of blood flow into the heart, the increase blood stretches the walls of the heart chambers- as a result of the stretch the cardiac muscle contract with increased force- this action empties the extra blood that has entered the systemic circulation- this describes the?
Frank starlings mechanism
The stretch of the heart also causes the heart to pump faster causing increased heart rate/ contraction- this has an affect of the rhythmicity of the node to increase heart rate. This is called?
SA node stretch