Hemodynamic monitors and equipment 2 Flashcards

1
Q

What is the approximate distance from the vena cava/right atrial junction to the right atrium?

A

0-10 cm

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2
Q

What is the approximate distance from the vena cava/right atrial junction to the right venticle?

A

10-15 cm

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3
Q

What is the approximate distance from the vena cava/right atrial junction to the pulmonary artery?

A

15-30 cm

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4
Q

What is the approximate distance from the vena cava/right atrial junction to the PAOP position?

A

25-35 cm

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5
Q

The CVP waveform reflects

A

the pressure inside the right atrium

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6
Q

The CVP waveform has ____________ peaks and ______ troughs

A

three peaks (A, c, v) and two troughs (x, y)

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7
Q

The A wave is equivalent to the

A

RA contraction

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8
Q

The C wave is equivalent to the

A

tricuspid valve elevation into the RA

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9
Q

The X decent is equivalent to the

A

downward movement of the contracting RV

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10
Q

The V wave is equivalent to the

A

passive filling of the RA

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11
Q

The CVP waveform is a reflection of the

A

pressure inside the right atrium

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12
Q

What is the electrical event associated with the A wave of the CVP waveform?

A

just after P wave (atrial depolarization)

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13
Q

What is the electrical event associated with the C wave of the CVP waveform?

A

Just after QRS complex (ventricular depolarization)

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14
Q

What is the electrical event associated with the X descent of the CVP waveform?

A

ST segment

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15
Q

What is the electrical event associated with the V wave of the CVP waveform?

A

Just after T wave begins (ventricular depolarization)

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16
Q

What is the electrical event associated with the Y descent of the CVP waveform?

A

after T wave ends

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17
Q

Central venous pressure is:
a. falsely increased by placing the transducer above the zero point
b. increased by PEEP
c. decreased by pericardial tamponade
d. unchanged by a ventricular septal defect

A

b. increased by PEEP

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18
Q

The CVP should be zeroed at the

A

fourth ICS at the mid anteroposterior level (phlebostatic axis)

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19
Q

The CVP measurement is best taken at

A

the end-expiration

20
Q

The normal CVP in the adult is

A

1-10 mmHg

21
Q

The CVP is not a great monitor of

A

real-time intravascular volume assessment

22
Q

Factors that increase CVP include

A

hypervolemia
tricuspid stenosis or regurgitation
pulmonary hypertension
cardiac tamponade
PEEP
VSD
constrictive pericarditis
pulmonic stenosis
RV failure

23
Q

A low CVP is almost always caused by

A

hypovolemia or if the transducer is moved above the zero point

24
Q

A CVP transducer placed above the zero point will

A

underestimate CVP

25
Q

Central venous pressure is a function of

A

intravascular volume
venous tone
right ventricular compliance

26
Q

Which conditions increase the amplitude of the a wave on the CVP waveform? (select 2)
a. tricuspid stenosis
b. atrial fibrillation
c. diastolic dysfunction
d. tricuspid regurgitation

A

a. tricuspid stenosis
c. diastolic dysfunction

27
Q

Select causes of a missing a wave include

A

atrial fibrillation & V-pacing if the underlying rhythm is asystole

28
Q

Select causes of a large a wave include

A

tricuspid stenosis, diastolic dysfunction, myocardial ischemia, chronic lung disease leading to RV hypertrophy, junctional rhythm, PVCs, & AV dissociation

29
Q

Select causes of a large v wave include

A

tricuspid regurgitation, acute increase in intravascular volume, & RV papillary muscle ischemia

30
Q

The diastolic pressure __________ as the tip of the PAC catheter moves beyond the pulmonic valve

A

rises

31
Q

______________- is formed during pulmonic valve closure during diastole with a PAC.

A

The dicrotic notch

32
Q

The pulmonary artery occlusion pressure is an estimate of

A

left ventricular end diastolic pressure

33
Q

When the PAC is in the right ventricle, the waveform changes in the following ways:

A

the systolic pressure increases
the diastolic pressure is equal to CVP

34
Q

The waveform of the pulmonary artery occlusion pressure (wedge pressure) is akin to the

A

CVP of the left heart

35
Q

The a wave of the pulmonary artery occlusion pressure is caused by

A

left atrial systole

36
Q

The c wave of the pulmonary artery occlusion pressure is caused by

A

mitral valve elevation into the LA during LV systole

37
Q

The v wave of the pulmonary artery occlusion pressure is caused by

A

passive left atrial filling

38
Q

Normal systolic right ventricular pressure is

A

15-30 mmHg

39
Q

Normal diastolic right ventricular pressure is

A

0-8 mmHg

40
Q

Normal systolic pulmonary artery pressure is

A

15-30 mmHg

41
Q

Normal diastolic pulmonary artery pressure is

A

5-15 mmHg

42
Q

Normal pulmonary artery occlusion pressure is

A

5-15 mmHg

43
Q

In which lung zone should the tip of the pulmonary artery catheter be placed?

A

zone 3

44
Q

Zone 3 is the _______ region of the lung

A

dependent

45
Q

Things that suggest that the tip of the PA catheter is NOT in zone 3 include:

A

PAOP>pulmonary artery end-diastolic pressure
non-phasic PAOP tracing
inability to aspirate blood from the distal port when the balloon is in the wedged position

46
Q

Why should the tip of the PA catheter be positioned in zone 3?

A

continuous column of blood between the tip of the PAC and the left ventricle (LVEDP reflects back through the pulmonary circulation)