A diver presents with dyspnea after rapid ascent; which diving-related condition is most likely?

A diver presents with dyspnea after rapid ascent; which diving-related condition is most likely?

• A. Air embolism
• B. Hypothermia
• C. Heat exhaustion
• D. Dehydration

Answer: (A)

Rapid ascent can cause the lungs to overexpand, and if a diver holds a breath during ascent, alveolar walls can rupture. This allows air to enter the pulmonary veins and arterial circulation, creating an air (gas) embolism. Those bubbles traveling through the blood can block vessels in the lungs and elsewhere, leading to sudden dyspnea, chest pain, coughing, and sometimes neurologic symptoms. This is the most likely explanation for breathing difficulty right after a fast ascent. Treatment hinges on briskly giving 100% oxygen and arranging immediate hyperbaric recompression therapy, which helps reduce bubble size and improve oxygen delivery. Decompression sickness, while also a diving risk, tends to present with joint pain, skin symptoms, and varied neurologic signs and may not be as immediately linked to rapid ascent with dyspnea alone. Hypothermia, heat exhaustion, and dehydration are not the first concerns in this acute post-ascentsymptom scenario.

Rapid ascent can cause the lungs to overexpand, and if a diver holds a breath during ascent, alveolar walls can rupture. This allows air to enter the pulmonary veins and arterial circulation, creating an air (gas) embolism. Those bubbles traveling through the blood can block vessels in the lungs and elsewhere, leading to sudden dyspnea, chest pain, coughing, and sometimes neurologic symptoms. This is the most likely explanation for breathing difficulty right after a fast ascent.

Treatment hinges on briskly giving 100% oxygen and arranging immediate hyperbaric recompression therapy, which helps reduce bubble size and improve oxygen delivery. Decompression sickness, while also a diving risk, tends to present with joint pain, skin symptoms, and varied neurologic signs and may not be as immediately linked to rapid ascent with dyspnea alone. Hypothermia, heat exhaustion, and dehydration are not the first concerns in this acute post-ascentsymptom scenario.