Correspondence: High positive airway pressure could shorten the drainage period in haemothorax but not physiotherapy intervention.

Dos Santos et al conducted a thorough randomised controlled trial with high methodological quality, in which they attempted to evaluate whether mobilisation and respiratory techniques shorten the drainage period and length of hospital stay in patients with pleural effusion. Their second objective was to evaluate whether such a strategy combined with continuous positive airway pressure (CPAP) could further improve the benefits. [...