Lung Volume Recruitment Slows Pulmonary Functional Decline and Prolongs Survival in ALS.
Taiyo Kawaguchi, Keisuke Yorimoto, Michiyuki Kawakami and 6 others
PMID 41247844WHAT IT FOUND
In people with ALS, lung volume recruitment was associated with a slower decline in lung capacity and longer survival, particularly when continued for six months or more.
However, this was a retrospective study without a control group, so the intervention did not cause these outcomes.
Key findings
01The rate of decline in forced vital capacity was approximately 2% per month before lung volume recruitment began, and less than 1% per month after it began.
02Patients who continued lung volume recruitment for six months or longer had a mean estimated survival of 2407.7 days, compared to 1364.8 days for those who continued for less than six months.
03In multivariate analysis, continuing lung volume recruitment for six months or longer was the only factor significantly associated with survival, with a hazard ratio of 0.42.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
This was a retrospective observational study without a control group or randomisation, so it cannot establish that lung volume recruitment caused the observed outcomes. Adherence to the home-based lung volume recruitment protocol was not quantitatively monitored, so it is unclear how consistently patients performed the technique. The study was conducted at a single institution, and the survival analysis grouped patients by follow-up duration rather than treatment adherence, which may introduce bias. Potential confounders such as disease severity, motivation, other interventions, nutrition, and socioeconomic factors were not fully controlled for and may have influenced outcomes. The number of patients in the respiratory analysis was small (n=48), and the survival analysis relied on stratification by follow-up length, which is not the same as stratification by treatment duration.
Declared interests
The authors declare no conflicts of interest.
The easy way to misread this
Do not conclude that lung volume recruitment causes longer survival in ALS. This was a retrospective study without a control group, and patients who continued follow-up for six months or more may have differed in disease severity, motivation, or access to care from those who did not. The association between longer follow-up and survival does not prove the intervention extended life.
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