Effects of postural differences on intrapleural pressure during chest wall compression in healthy males.
Kenta Yamamoto, Kyoshi Mase, Kazuaki Kihara and 2 others
PMID 33642687WHAT IT FOUND
In seven healthy men, manual chest compression caused less negative intrapleural pressure and fewer signs of lung collapse when performed lying on the side compared to lying on the back.
Key findings
01During manual chest wall compression, end-expiratory lung volume was significantly higher and intrapleural pressure at end-expiration was significantly lower (less positive/more negative) in the bilateral decubitus positions compared to the supine position.
02All participants showed a low inflection point (suggestive of lung collapse) on pressure-volume loops during compression in the supine position, whereas no participants showed this in the right decubitus position and only two did in the left.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study included only seven healthy males, so results may not apply to females or individuals with respiratory disease. Patients with ARDS or acute lung injury have different lung compliance than healthy individuals, so the effects of CWC in those populations are unknown. The sample size is very small, limiting the generalizability of the findings.
Declared interests
No financial support was received, and the authors declared no conflicts of interest.
The easy way to misread this
Do not assume this proves CWC is safer or more effective in patients with lung disease. The study was conducted only on healthy males, and the physiological differences observed may not translate to clinical benefit in patients with conditions like ARDS or COPD.