CVS Definitions

Question 1

MAP

Answer 1

        3

OR

DBP + (PP/3)

OR

SV x HR x SVR

Question 2

What is coronary perfusion pressure?

Answer 2

The maximum pressure of the blood perfusing the coronary arteries (mmHg)

or The pressure difference between aortic diastolic pressure and LVEDP(mmmHg)

Question 3

CPP equation?

Answer 3

CPP = ADP - LVEDP

Question 4

Coronary Blood Flow?

Answer 4

coronary perfusion pressure / coronary vascular resistance

Question 5

What is central venous pressure?

Answer 5

Hydrostatic pressure generated by the blood in the great veins. It can be used as a surrogate of right atrial pressures (mmHg).

Question 6

?Pulmonary Capillary Wedge Pressure

Answer 6

is an indirect estimate of left atrial pressure.

Measured by passing a catheter through right side of heart into pulmonary vessels and measuring its changing pressures.

Should be ideally measured in West Zone 3.. Surrogate for LVEDP.

Question 7

Pressure right atrium

Answer 7

0-5 mmHg

Question 8

Pressure right ventricle

Answer 8

oscillates between 0-5 mmHg and 20-25 mmHg

Question 9

Pressure pulmonary artery

Answer 9

Diastolic: 10 - 15 mmHg (increases due to pulmonary valves)
Systolic: 20 - 25 mmHg

Question 10

PCWP valvue?

Answer 10

6 - 12 mmHg, found at insertion length around 45cm.

Question 11

Cardiac output =

Answer 11

SV x HR

Question 12

Define stroke volume

Answer 12

Volume of blood ejected from left ventricle with every contraction (ml). Dependent on preload, afterload, and contractility.

Question 13

Preload define

Answer 13

Initial length of the cardiac muscle fibre before contraction begins.

Question 14

Afterload define

Answer 14

Tension which needs to be generated in cardiac muscle fibres before shortening will occur.