The obesity epidemic is a global problem, which is set to increase over time. However, the effects of obesity on the respiratory system are often underappreciated. In this review, we will discuss the mechanical effects of obesity on lung physiology and the function of adipose tissue as an endocrine organ producing systemic inflammation and effecting central respiratory control. Obesity plays a key role in the development of obstructive sleep apnea and obesity hypoventilation syndrome. Asthma is more common and often harder to treat in the obese population, and in this study, we review the effects of obesity on airway inflammation and respiratory mechanics. We also discuss the compounding effects of obesity on chronic obstructive pulmonary disease (COPD) and the paradoxical interaction of body mass index and COPD severity. Many practical challenges exist in caring for obese patients, and we highlight the complications faced by patients undergoing surgical procedures, especially given the increased use of bariatric surgery. Ultimately, a greater understanding of the effects of obesity on the respiratory disease and the provision of adequate health care resources is vital in order to care for this increasingly important patient population.

It is possible to hyperoxygenate patients with type 2 respiratory failure in flight with the minimum level of supplementary oxygen available on many aircraft. In these cases P(a)co(2) and pH should be scrutinized during HCT before recommending in-flight oxygen. No current guidelines discuss the risk of hypercapnia from in-flight oxygen; it is therefore recommended that this be addressed in future revisions of medical air travel guidelines, should further research indicate it.

A 62-year-old man presented with worsening dyspnoea, haemoptysis and reduced exercise tolerance. He was found to be hypoxaemic with bilateral basal opacification on chest imaging, but inflammatory markers, respiratory virus PCR and sputum culture demonstrated no signs of infection. The patient reported having initially mild, yet progressive, symptoms since he started vaping 14 months previously. He was treated with oxygen therapy, supportive care and cessation of vaping. Chest imaging at discharge showed marked improvement of previous bilateral opacification and the patient returned to baseline exercise tolerance, with no oxygen requirement. Vaping is becoming more common in the UK and this case demonstrates the importance of considering electronic vaping-associated lung injury in cases of non-infective lung injury.

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