What is the first step upon assessing a diver with suspected arterial gas embolism?

In cases of suspected arterial gas embolism, the first critical step involves initiating CPR if the diver is unresponsive or not breathing adequately. This situation requires prompt action to ensure the diver receives necessary support for circulation and oxygenation, which are vital when dealing with potential respiratory or cardiac failure.

While other actions are essential in the management of arterial gas embolism, such as notifying a medical officer or administering oxygen, starting CPR is prioritized as it addresses immediate life-threatening issues. The focus during the initial response is on preserving life by maintaining circulation and supporting respiratory function.

Administering oxygen becomes crucial later in the treatment process to help reduce symptoms and facilitate recovery, but it should not replace the immediate need for CPR if the diver is non-responsive. Immediate recompression might also be warranted to mitigate further complications from the embolism, but again, this step cannot precede ensuring that the diver has adequate perfusion and respiration. Notifying a medical officer is a critical next step, but the immediate health of the diver takes precedence.