Phys 5 contractility and cardiac output Flashcards
What is contractility?
proportional to what?
Length-tension relationship in heart
what we increases with pressure?
What is preload?
What is afterload?
velocity of contraction is related to what?
Where would you see preload and afterload on the cardiac cycle graphs?
what is Stroke volume?
Ejection fraction? around normal value?
Cardiac output?
where on the cardiac cycle graphs would you be able to get he EDV and ESV values?
Length-tension relationship
Frank-starling relationship?
what is it?
How does EDV relate to CO?
what can change cardiac output?
What type of graph is this?
Explain what is happening from 1 to 2 to 3
Ventricular pressure-volume loops
Explain what is happening from 3 to 4 and 4 to 1
Relate what is happening from 1 to 2 compared to the cadiac cycle graphs
Relate what is happening from 2 to 3 to the cardiac cycle graphs
Relate what is happening from 3 to 4 to the cardiac cycle graphs
Relate what is happening from 4 to 1 to the cardiac cycle graphs
How will the pressure volume loop look if you increased preload?
How will the pressure volume loops look if you increased afterload?
what are some causes of increased afterload?
How will the pressure volume loops look after increased contractility?
what causes this?
Sympathetic and parasympathetic influence on CO
Sympathetic will effect what?
what receptor?
what effects?
Sympathetic and parasympathetic influence on CO
parasympathetic
what receptor?
what effects?
Effect of heart rate on contractility?
What do cardiac glycosides treat?
How do they do this?
Cardiac work
what are the different types of work?
Myocardial oxygen consumption
What type of work uses the largest % of O2 consumption?
why?
what can make it even worse?
measurement of CO
what principle?
what other techniques?
