Cardiac cycle and haemodynamics Flashcards Preview

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Flashcards in Cardiac cycle and haemodynamics Deck (13):
1

What is the equation for pressure

Pressure = flow X resistance

2

Describe the PQRST wave in terms of depolarisation

P - depolarisation of SA node (atrial depolarisation)
QRS - ventricular depolarisation
T - relaxation of ventricles

3

What is diastolic ventricular filling?

when the ventricles are filling

4

What is isovolumic contraction?

When ventricles have raised pressure, but no ejection cos the valves are closed.

5

Systolic ejection

blood pumped out

6

What does haemo-dynamics mean?

Blood-power

7

State the two equations for power

Force X velocity
Pressure X Flow rate

8

What is stoke volume?

Stroke volume is the amount of blood ejected by the left ventricle in one contraction.

9

State the equation for stroke volume

(End-diastolic volume) - (End - systolic volume)

10

State the equation for ejection fraction (LVEF)

LVEF is just the fraction of blood that is pumped out. So percentage.

LVEF = SV/EDV

11

State the equation for cardiac ouput

Cardiac output = heart rate X stroke volume

12

What is the primary function of the heart as a pump?

To convert chemical energy (atp) into hydraulic energy in order to maintain a physiological circulation

13

What is aortic stenosis?

narrowing of the aortic valve