Air Diving Supervisor Practice Exam 2025 - Free Diving Supervisor Practice Questions and Study Guide

The tonic-clonic phase of an oxygen convulsion typically lasts between 1 to 2 minutes. This phase, which is characterized by the initial muscle stiffening (tonic phase) followed by rhythmic muscle contractions (clonic phase), represents a significant period of the seizure activity. This duration often aligns with observed patterns in clinical cases, where convulsions caused by hypoxia or oxygen toxicity can involve this timeframe.

Understanding this duration is crucial for diving professionals, as it helps in recognizing and managing potential convulsions during diving operations. If an oxygen convulsion occurs, knowing the expected duration enables supervisors and team members to respond appropriately, ensuring the safety and proper care of the diver experiencing the convulsion. Monitoring the duration also assists in determining when to seek further medical attention if the seizure activity extends beyond the typical timeframe.