Tsai et al developed a classification tree for patients with asthma in the Emergency Department. This can help to identify a patient who may need to be admitted. The authors are from Massachusetts General Hospital and the University of Pittsburgh.
CHOP is an acronym for the 4 parameters involved.
Patient selection: acute asthma in the Emergency Department
Outcome: admission
Parameters:
(1) change in peak expiratory flow (C), improved or not improved
(2) ever hospitalized for asthma (H)
(3) oxygen saturation on room air (O)
(4) initial peak expiratory flow (P), mild, moderate, severe or very severe
Sex
PEF in L/min
Initial PEF
male
>= 400
mild
250 to 399
moderate
150 to 249
severe
< 150
very severe
female
>= 300
mild
200 to 299
moderate
120 to 199
severe
< 120
very severe
Hospital
O2 Sat
Initial PEF
Change
Admit
never
> 95%
mild, moderate, severe
NA
9%
never
> 95%
very severe
NA
27%
never
<= 95%
NA
improved
12%
never
< 95%
NA
not improved
26%
>= 1
NA
mild
NA
11%
>= 1
NA
moderate
NA
26%
>= 1
NA
severe, very severe
NA
48%
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