Immersion Pulmonary Edema

Identifying Swimming Induced Pulmonary Edema

Swimming induced pulmonary edema (SIPE) may occur in healthy subjects during or immediately after swimming and exercise. It is characterized by an acute onset cough which may be accompanied by difficulty breathing, chest tightness and frothy red sputum. If not recognized, symptoms which are typically initially mild may quickly worsen and become life threatening. Due to its multifactorial nature and a lack of specific symptoms, the condition may frequently be misdiagnosed and treatment delayed.

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In Diagnosis of Swimming Induced Pulmonary Edema — A Review Grunin and co-authors studied thirty-eight cases of SIPE published in seventeen papers to identify symptoms, signs, findings and history that help to establish diagnoses. (1)

They have found that an acute onset of cough and difficulty breathing were common to all cases. Tightness of chest was sometimes present. At onset the cough is usually nonproductive but occasionally it may produce sputum with traces of blood. Athletes or divers experiencing any of these symptoms should exit water and stop exercising immediately. Emergency oxygen typically lessens symptoms and helps recovery. Initial evaluation by auscultation usually finds crackles, rales and wheezing, signs of fluid in airways. These findings may affect only one lung. At admission most cases show hypoxemia and radiological signs of pulmonary edema. The majority of the cases (82%) resolve within 48 hours.

SIPE used to be associated with combat swimmers training with reported prevalence of 1.4% to 60%. Prevalence also seem high in triathletes (1.4%). Snorkelers and scuba divers are also at risk, especially those with cardiopulmonary disease and pulmonary hypertension. Other risk factors include cold water, exercise, elevated negative inspiratory pressure, and emotional stress. Some research indicates that women may be at a higher risk of SIPE than men. It is important to realize that both divers with some pre-existing conditions as well as healthy fit young athletes are at risk. With the increasing popularity of aquatic sports the prevalence of SIPE is expected to increase as well. Thus, participants in aquatic sports and health care providers should be familiar with manifestations and diagnosis of SIPE. This paper provides an excellent material for that purpose.

Grünig H, Nikolaidis PT, Moon RE and Knechtle B (2017) Diagnosis of Swimming Induced Pulmonary Edema—A Review. Front. Physiol. 8:652. doi: 10.3389/fphys.2017.00652

What is the Common Risk Faced by Recreation, Technical, and Breath Hold Divers?

Immersion pulmonary edema (IPE) continues to be a central focus of dive medicine researchers and clinicians. Late last week, at the 2017 EUBS Annual Meeting, four scientists presented five different studies on the subject.

It appears that IPE is significantly more common than previously reported. In a two year period (2014-16) one hyperbaric facility in Cozumel diagnosed 40 cases of IPE among recreational scuba divers­1. On the other side of the world, there were 21 cases of IPE reported among French military rebreather divers in a six year period2. (more…)