Heart Rate, Stroke Volume, Cardiac Output, MAP

• Heart rate = HR
• Stroke volume = EDV-ESV
• Mean atrial pressure = average of end systolic and end diastolic pressure = diastolic pressure + (pulse pressure)/3
• Pulse pressure = Systolic pressure - Diastolic pressure
• Cardiac output = Blood flow
• F a 1/R
• F a 1/L
• R a L
• L = Length of the blood vessel
• R = Resistance
• Blood pressure = Cardiac output x Total peripheral resistance
• MAP = CO x TPR

 

 

 

*Chronotropic = Heart rate (SA node)

*Inotropic = Contractility

*Dromotropic = Conduction velocity (AV node)

*Bathmotropic = Excitability

*Lusitrophic = Relaxation

 

 

 

Preload : initial stretching of the cardiac myocytes (muscle cells) prior to contraction. (related to ventricular filling)

Afterload : force or load against which the heart has to contract to eject the blood