Allen Test

Question 1

to evaluate patency of

Answer 1

palmar arch

Question 2

asses for adequate perfusion to the hand if

Answer 2

radial a harvested or used for dialysis access

Question 3

with manual compression of _____, pt clenches ipsilateral fist inducing pallow, while at the same time increasing resistance

Answer 3

radial a

Question 4

with manual compression of the radial a continuing, pt is asked to relax

Answer 4

hand

Question 5

modified version: PPG on index finger before and during manual compression of

Answer 5

radial a

Question 6

normal

Answer 6

reappearance of the normal color to indicate the ulnar a is providing flow to the palmar arch
PPG documents pulsations during compression

Question 7

Abnormal

Answer 7

color doesn;t reppear to indicat: an ulnar a occlusion or palmar arch obstruction
PPG documents loss of pulsations during compression

Question 8

excessive dorsiflexion of wrist may compress radial and ulnar a leading to

Answer 8

false positive test

Question 9

if hand is opened fingers forcibly extended, the skin over palm can be

Answer 9

stretched

could lead to pallor due to compression of small vessels

Question 10

use PPG on index finger to document a pulsations before and after

Answer 10

clenched fist or during manual compression

Question 11

although more difficult to compress, the ulnar a can be evaluated similarly to asses

Answer 11

radial a flow

Question 12

15-20 mmHg difference from one brachial pressure to the other suggest a > 50% stenosis of

Answer 12

subclavian a and vessel under cuff

Question 13

< 15-20 mmHg drop from upper arm to forearm suggest

Answer 13

brachial a obstruction distal to upper cuff
obstruction in single forearm a which has decreased presure
obstruction in both radial and ulnar a

Question 14

difference of > 20 mmHg between radial and ulnar pressure suggest obstruction in vessels with lower

Answer 14

P