Reverse Block
Definition
A reverse block is a condition where expanding air becomes trapped in a diver’s sinuses or ears during ascent, causing pain or injury.
More on Reverse Block
Reverse block usually occurs when congested sinuses or ear passages prevent gas from escaping during ascent. As the diver rises and pressure decreases, trapped air expands, potentially causing intense pain or barotrauma. To avoid reverse block, divers should not dive when congested or using medications that can wear off underwater. Controlled, slow ascents with frequent pauses help manage pressure equalization during ascent.
Frequently Asked Questions
Sharp pain or pressure in the ears or sinuses during ascent. It can cause dizziness or even rupture the eardrum if severe.
Avoid diving when congested, use equalization techniques, ascend slowly, and never force your ears.
No. Even if you can equalize on descent, a blocked sinus may trap air and cause problems during ascent.
Stop your ascent, descend slightly to relieve pressure, and ascend more slowly while gently equalizing.
In rare cases, it can lead to sinus or ear barotrauma if not handled properly. Prompt medical evaluation is advised.