Preload

Question 1

Perfusion Pressure

Answer 1

Coronary BP; heart needs 15 mmHg

Question 2

Mean Arterial Pressure

Answer 2

Systolic + 2x(diastolic) over 3

Question 3

End organs are

Answer 3

brain, heart, lungs, kidney; they require a particular Mean Arterial Pressure (MAP) in order to function

Question 4

Hemodynamic Components are

Answer 4

Preload, afterload, Contractility

Question 5

Preload

Answer 5

Pressure exerted by the volume that the heart has to pump; the degree of ventricular stretch before next contraction/systole

Question 6

Preload factors to ventricular stretch

Answer 6

length of diastole, venous return, ventricular end diastole pressure

Question 7

Preload variables

Answer 7

volume (greater the volume = the greater the preload), pressure (think Pulmonary Arterial Wedge Pressure PAWP), Starling’s law (greater the stretch = the greater the contraction); cardiac function (if s/p MI compromised contraction); medications

Question 8

Preload physical assessment

Answer 8

we are assessing the pressure in blood vessel in lungs and blood returning to heart; look for JVD, intrathoracic pressure

Question 9

Preload invasive monitoring

Answer 9

Central venous pressure via central line that measures pressure in the R atrium or vena cava; Pulmonary Artery Wedge Pressure that measures pressure at pulmonary capillary