Survival prediction in patients with chronic obstructive pulmonary disease following a pulmonary rehabilitation programme in Hong Kong.
Cherry Wl Lau, Thomas Mok, William Wn Ko and 8 others
PMID 32009862WHAT IT FOUND
Completing pulmonary rehabilitation predicted longer survival in patients under 72.
For those 72 and older, a low baseline functional task score predicted shorter survival. These findings help therapists flag patients needing more support to finish programmes or targeted functional training.
Key findings
01For patients aged under 72, completing the pulmonary rehabilitation programme was a significant predictor of survival, with completers having a median survival of 7 years compared to 4.1 years for non-completers.
02For patients aged 72 and over, a baseline Monitored Functional Task Evaluation score of 17 or higher predicted longer median survival (4.9 years) compared to those scoring below 17 (2.2 years).
03For patients aged under 72, better baseline activities of daily living performance was also a significant predictor of survival, with those in a lower disability class surviving a median of 5.7 years versus 4.1 years for those with higher disability.
STILL TO COME
How it was doneWhat they foundWhat it means for OTs
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What it does not show
The study was retrospective and observational, so it can only show associations, not prove that the rehabilitation programme caused the survival benefit. There was no control group of COPD patients who did not attend the programme, so it is impossible to know how these patients would have survived without the intervention. The follow-up period was limited to a maximum of 3.5 years after the programme, which may not capture long-term survival trends. Important clinical variables such as smoking status and the BODE index were not available in the electronic records and could not be analysed as potential confounders. The cohort was predominantly male (91.6%) and from a specific local context, which may limit generalisability to other populations.
Declared interests
The authors declared no conflicts of interest. The study was approved by the Kowloon Central/Kowloon East Cluster Hospital Authority Ethical Committee.
The easy way to misread this
Do not assume that pulmonary rehabilitation directly extends life for every patient. This was an observational study without a control group, so it shows that patients who completed the programme or had better function lived longer, but it does not prove the programme itself caused the survival difference.