Cardiac function and its control Flashcards Preview

Z MD1 Cardiac physiology > Cardiac function and its control > Flashcards

Flashcards in Cardiac function and its control Deck (12)
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1
Q

4 phases of the pressure-volume curve

A

diastole isovolumetric contraction systole isovolumetric relaxation

1
Q

Preload

A

The stretch on the myocyte fibres before they commencecontraction

2
Q

normal SV

A

100ml

2
Q

normal EDP

A

15mmHg

3
Q

Exaplain the Frank Starling relationship

A

more stretch on the cardiac myocytes by increased venous return (increased EDV), results in more tension in the wall and increased SV

4
Q

What can increase afterload

A

arterial hypertension LV outflow tract obstruction (eg. aortic stenosis)

5
Q

Afterload

A

the load encountered by the ventricle as it commences contraction

7
Q

for any volume of blood, the pressure depends on

A

the compliance of the wall the active tension in the wall

8
Q

stroke volume can be increased by

A

increasing EDV (increased venous return) increasing ventricular contractility (inotropy)

9
Q

normal ESP

A

5 mmHg

11
Q

normal ESV

A

75ml

12
Q

what increases preload

A

increased venous return