Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

My Cardiac Physiology > Quiz 4 > Flashcards

Quiz 4 Flashcards

1
Q
  1. How is the velocity of blood flow related to the cross-sectional area of a blood vessel or group of blood vessels?
A

Velocity is inversely related to cross-sectional area

V=Q(flow)/A(cross-sectional area)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q
  1. Name a return-to-flow technique of blood pressure measurement.
A
  • Palpation
  • Pulse ox (plethysmographic waveform)
  • arterial catheter
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q
  1. In a healthy individual with disease-free arteries, does systolic blood pressure increase or decrease in the leg relative to the proximal aorta?
A

Increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q
  1. What are the 3 waves seen in a normal CVP tracing?
A
  • a - right atrial contraction (correlates with p wave)
  • c - tricuspid valve/ventricular contraction (end of QRS)
  • v - blood filling R atrium (end of T wave)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q
  1. What are the different waveforms that would be encountered when inserting a Swan-Ganz catheter from its insertion in the right jugular vein to its final position in a pulmonary artery?
A
  • RV pressure
  • PA Pressure
  • Wedge pressure
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q
  1. What information can be gathered from a Swan-Ganz catheter? DIRECTLY
A
  • CVP
  • RA/RV pressures
  • PA pressures
  • PAOP/Wedge
  • CO
  • SvO2
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
  1. What are the 2 steps of “zeroing” a transducer?
A

-Zero
-Appropriate height relative to patient position
(5 cm below the left sternal border at the fourth intercostal space)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q
  1. What is the Fick Principle method of measuring cardiac output?
A

o2 per minute absorbed by lungs/arteriovenous o2 difference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q
  1. What is cerebral perfusion pressure?
A

The difference between arterial and venous pressures

MAP – CVP or ICP (whichever is higher)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q
  1. What is Poiseuille’s Law? and what components (3)
A

Determines resistance to flow

(Radius, Length, Viscosity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q
  1. According to Poiseuille’s Law what factor has the greatest impact on the rate of blood flow through a vessel?
A

Radius

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q
  1. What is resistance?
A

Resistance is the impediment to blood flow in a vessel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q
  1. Can resistance be measured directly?
A

no

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q
  1. What is the formula for calculating Systemic Vascular Resistance?
A

(MAP - CVP)/CO x 80

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q
  1. What is the formula for calculating Pulmonary Vascular Resistance?
A

(MPAP - PCWP)/CO x 80

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q
  1. How would you calculate resistance when blood vessels are arranged in series?
A

add up the resistances to get total

R1 + R2 = Rtotal

17
Q
  1. How would you calculate resistance when blood vessels are arranged in parallel?
A

1/R1 + 1/R2 = 1/Rtotal

note: the total resistance is less than any single blood vessel also means better flow total than single vessel

18
Q
  1. If you added another blood vessel in a parallel arrangement, would total vascular resistance increase or decrease? Why?
A

Decrease

19
Q
  1. What is laminar flow?
A

Smooth flow

20
Q
  1. What is turbulent flow?
A

the blood flows crosswise in the vessel and along the vessel, usually forming whorls in the blood, callededdy currents

21
Q
  1. What formula could you use to predict laminar versus turbulent flow?
A

Reynold number

Density, Diameter, Viscosity, Velocity

22
Q
  1. What is the relationship of hematocrit to blood viscosity?
A

More hematocrit, more viscosity

23
Q
  1. As blood pressure increases within a vessel why does blood flow increase much greater than one would expect? what law? Ohms
A

because (P.arterial - P.venous)/Radius = flow

Ohms law

24
Q
  1. What is the most important monitor in the operating room?
A

The anesthetist

25
Q
  1. What is damping in an arterial line tracing?
A

How quickly vibrations come to rest

26
Q
  1. What is ringing in an arterial line tracing? What range?
A

When the fast flush abruptly ends, the transducer system oscillates at its natural frequency. This can be measured and assessed for adequacy.

> 24 hz

27
Q
  1. According to Ohm’s Law what 2 factors determine blood flow through a blood vessel?
A

Pressure or voltage drop, resistance

28
Q
  1. Define blood pressure.
A

Blood pressure is the force exerted by the blood against any unit area of the vessel wall

29
Q
  1. What is the conversion factor from mm-Hg (mercury) to cm-H2O?
A

1 mmHg = 1.36 cm H2O

30
Q

excessive damping leads to

A

underestimated systolic and overestimated diastolic

31
Q

Underdamping leads to

A

overestimated systolic and underestimated diastolic

My Cardiac Physiology (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions