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Pulmonary oedema relatively little known hazard associated with open water swimming: BMJ

Written By : Dr. Kamal Kant Kohli Published On 2023-01-20T10:45:23+05:30  |  Updated On 20 Jan 2023 3:32 PM IST
Pulmonary oedema relatively little known hazard associated with open water swimming: BMJ
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UK: Based on their treatment of a woman with immersion pulmonary oedema (IPE), the doctors have warned that pulmonary oedema or fluid on the lungs is a relatively little-known hazard associated with open water swimming.

Older age, swimming long distances, cold water, and female sex are among the risk factors, as are high blood pressure and pre-existing heart disease. But it frequently occurs in those who are otherwise fit and healthy, highlighted by the authors in BMJ Case Reports.

Open-water swimming has become very popular, with more than 3 million enthusiasts in England in 2021 alone. But mounting evidence points to a link between the activity and a condition called swimming-induced pulmonary oedema, or SIPE.

First reported in 1989, SIPE leaves swimmers struggling to draw breath and depletes their blood of vital oxygen. According to the authors, it affects an estimated 1-2% of open-water swimmers, but cases are likely to be underreported.

The woman in question was in her 50s and a keen competitive long-distance swimmer and triathlete.

Otherwise, fit and well, she was struggling to breathe and coughing up blood after participating in an open water swimming event at night in water temperatures of around 17°C while wearing a wetsuit. Her symptoms started after swimming 300 metres.

She had no medical history of note, but experienced breathing difficulties during an open water swim a fortnight earlier, forcing her to abandon the event and feel breathless for some days afterwards.

On arrival at hospital, her heartbeat was rapid, and a chest x-ray revealed pulmonary oedema. Further scans revealed that fluid had infiltrated the heart muscle, a sign of strain known as myocardial oedema. But she had no structural heart disease.

Her symptoms settled within 2 hours of arrival at hospital. And after careful monitoring, she was discharged the following morning.

It’s not clear exactly what causes SIPE. But it likely involves increases in arterial pressure in the lungs secondary to centralisation of blood volume in a cold environment, combined with an exaggerated constriction of these blood vessels in response to the cold and increased blood flow during physical exertion.

But recurrence is common and has been reported in 13%-22% of scuba divers and swimmers, suggesting a predisposition to the condition, say the authors.

They advise swimming at a slower pace, accompanied, in warmer water, without a tight-fitting wetsuit, and avoidance of non-steroidal anti-inflammatories, such as ibuprofen, to minimise the risk.

For those experiencing symptoms for the first time, the authors recommend stopping swimming and getting out of the water straight away, then sitting upright and calling for medical assistance if required.

This is just one case, emphasises the authors, whose aim in reporting it is to raise awareness among doctors and swimmers of a relatively little-known condition.

“The UK Diving Medical Committee has published guidance for divers. However, there are currently no formal national medical guidelines concerning the recognition and management of this complex condition,” they note.

Reference:

Oldman J, Morwood S, Willis J, et alMyocardial oedema in the setting of immersion pulmonary oedema - Cause or effect?BMJ Case Reports CP 2023;16:e251274.

BMJ Case ReportslungsFluidpulmonary oedemahigh blood pressureheart diseasevital oxygen
Source : BMJ Case Reports
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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