Chopra et al reported the Michigan Risk Score for prediction of deep vein thrombosis (DVT) associated with a peripherally-inserted central catheter (PICC). The authors are from the University of Michigan, VA Ann Arbor Health Care System, The Michigan Hospital Medicine Safety Consortium and Henry Ford Hospital.
Patient selection: peripherally-inserted central catheter (PICC line)
Outcome: catheter-associated venous thrombosis
Parameters:
(1) another central venous catheters when PICC line placed
(2) WBC count at the time of PICC line insertion
(3) history of cancer
(4) number of lumens in the PICC line
(5) history of venous thromboembolism (VTE)
Parameter
Finding
Points
another central venous catheteter present
no
0
yes
1
WBC count
<= 12,000 per µL
0
> 12,000 per µL
1
history of cancer
no
0
inactive
0
active
2
number of lumens
triple or quad
3
double
2
single
0
history of VTE
within past 30 days
3
more than 30 days ago
2
no
0
total score =
= SUM(points for all 5 parameters)
Interpretation:
• minimum score: 0
• maximum score: 10
Total Score
Class
Probability of VTE
0
I
0.9%
1 or 2
II
1.6%
3 or 4
III
2.7%
>= 5
IV
4.7%
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