Brainscape's Knowledge GenomeTM

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


See full index

Vascular surgery > Vascular Lab > Flashcards

Vascular Lab Flashcards

1
Q

Axial resolution relationship to frequency

A

Linear; dependent on US freq transducer and depth of structure of interest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Recommended measurement of Abdom aorta

A

A-P; outer wall to outer wall

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Characteristics of arterial waveform with proximal stenosis/obstruction

A

Delayed systolic upstroke; decrease in overall amplitude

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Characteristic of arterial waveform in presence of stenosis/obstruction distally

A

Diminished diastolic flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Characteristic of arterial waveform in presence of high grade stenosis

A

Increased PSV; turbulent flow; when stenosis severe, elevation of EDV

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Duplex US findings of cystic adventitial dz

A

Extra-luminal compression of pop artery; anechoic/hypoechoic w/o color flow; possibly elevated velocity beyond stenosis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the stereotypical signal for perforator veins on duplex US?

A

To-and-fro flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Duplex findings indicating hemodynamically significant restenosis of iliac stent

A

Localized elevated velocities >200cm/sec w/ turbulent flow; peak velocity ratios > 2.0; monophonic femoral waveforms; add’l physiologic data incl. ABI decrease by at least 0.15, return of claudication

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

TcPO2 sufficient to support wound healing

A

> 40 mmHg

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Ankle, toe pressures representing critical limb ischemia

A

Ankle pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Duplex US findings w pop art entrapment

A

Loss of pedal pulse, tri-phasic waveform with active plantar flexion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Dx maneuver to help dx MAL w duplex

A

Evaluate inspiratory and expiratory PSV’s of celiac artery; PSV increases w/ expiration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Define relationship btwn Doppler freq shift and transmitted US freq

A

Linear

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Define relationship between US amplitude and transmitted frequency

A

Amplitude is strength or POWER of the sound wave and is INDEPENDENT of frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Define PRF

A

of pulses that occur in 1 sec.; NOT related to transmitted US freq, nor will it change w/ the transducer frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Contraindications to US guided thrombin injection of femoral PSA

A

LE ischemia, infection at access site, AVFistula, pregnancy

17
Q

Complications of US guided thrombin injection

A

Intra-arterial thrombosis (

18
Q

Indications for open surgical repair of femoral PSA

A

Contraindications to non op mgmt (peripheral ischemia, infection, surgical graft, lg supra-Inguinal PSA) OR presence of complications (rapid enlargement, skin necrosis, distal embolization, rupture)

19
Q

Define renal resistive index (RRI) and its utility

A

Percentage reduction ED flow; marker of downstream impedance; values

20
Q

Describe spectral waveform found in presence of proximal stenosis

A

Damped or blunted, low velocity spectra, notched waveform

21
Q

Minimum BP cuff width for LE segmental Doppler pressures

A

At least 20% greater than diameter of the limb

22
Q

Normal high thigh pressures with 4 cuff technique? 3 cuff technique?

A

1.4; 1.0

23
Q

Duplex US Dx criteria for >60 % stenosis of renal artery

A

PSV > 200cm/sec; AND renal-aortic-ratio > 3.5; supra renal aorta must not be aneurysmal, and PSV must be at least 45cm/sec

24
Q

Restenosis/occlusion rate post CEA; CAS

A

Equal; approx 6 %

25
Q

Arteries examined in the teams-temporal window

A

MCA; ACA; PCA; terminal ICA

26
Q

Depths of arteries in trans-temporal window

A

MCA 30-60mm antegrade flow
Term ICA 55-65mm bidirectional
ACA 60-80mm retrograde
PCA 60-70mm antegrade

27
Q

Velocities indicating vasospasm on transcranial Doppler

A

Mean velocity 60cm/sec
MCA >120cm/sec
ACA >130cm/sec
PCA >110cm/sec

28
Q

Define relations between frequency shift and the propagation speed of US in the tissue

A

Inverse; it is proportional to the freq of transmitted US (transmitter freq), speed of RBC’s, cosine of Doppler angle (max at 0 degr, min at 99 degr)

Vascular surgery (4 decks)

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