Question

which of the following types of dive emergencies would most likely present with joint pain as the principal complaint?

arterial embolism.
nitrogen narcosis.
pneumomediastinum.
decompression illness.

Explanation:

Analyze the question and options

The question asks which dive emergency is most likely to present with joint pain as the principal complaint. Let's evaluate each option:

• Arterial gas embolism (AGE): Typically presents with rapid onset of severe neurological deficits (e.g., stroke-like symptoms, altered mental status) immediately upon surfacing.
• Nitrogen narcosis: Characterized by altered mental status, euphoria, or impaired judgment while at depth, which resolves upon ascent.
• Pneumomediastinum: A form of pulmonary barotrauma where air enters the mediastinum, typically presenting with retrosternal chest pain, dyspnea, or subcutaneous emphysema.
• Decompression illness (DCI): Specifically Decompression Sickness (DCS) Type I (often called "the bends"), is caused by nitrogen bubbles forming in blood and tissues (especially joints and tendons) during ascent. The classic, most common symptom of Type I DCS is deep, throbbing joint pain.

Identify the correct emergency

Joint pain is the hallmark clinical presentation of Type I decompression sickness, which falls under the umbrella of decompression illness.

Answer:

• Arterial embolism.
• Nitrogen narcosis.
• Pneumomediastinum.
• Decompression illness. (Correct answer)