_________ is the most common diving affliction and is caused by the direct mechanical effects of pressure.

_________ is the most common diving affliction and is caused by the direct mechanical effects of pressure.

• A. Barotrauma
• B. Hypoxia
• C. Dysbarism
• D. Decompression sickness

Answer: (B)

Barotrauma is the most common diving injury and arises from direct mechanical injury caused by pressure differences across gas-filled spaces. As a diver descends, ambient pressure increases; if the air in the middle ear (or sinuses) cannot be equalized, the pressure differential inflates or ruptures delicate membranes, causing pain, hearing changes, and sometimes injury such as tympanic membrane rupture. Lung barotrauma can occur if gas is trapped during ascent or if there’s underlying lung disease, potentially leading to pneumothorax or other serious consequences. Hypoxia, by contrast, is a functional problem from insufficient oxygen delivery or gas mixture issues, not a direct mechanical injury from pressure. Decompression sickness and other dysbaric conditions involve gas bubbles forming or evolving with pressure changes, but the classic, most common mechanical injury from pressure itself is barotrauma.

Barotrauma is the most common diving injury and arises from direct mechanical injury caused by pressure differences across gas-filled spaces. As a diver descends, ambient pressure increases; if the air in the middle ear (or sinuses) cannot be equalized, the pressure differential inflates or ruptures delicate membranes, causing pain, hearing changes, and sometimes injury such as tympanic membrane rupture. Lung barotrauma can occur if gas is trapped during ascent or if there’s underlying lung disease, potentially leading to pneumothorax or other serious consequences. Hypoxia, by contrast, is a functional problem from insufficient oxygen delivery or gas mixture issues, not a direct mechanical injury from pressure. Decompression sickness and other dysbaric conditions involve gas bubbles forming or evolving with pressure changes, but the classic, most common mechanical injury from pressure itself is barotrauma.