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Dr. Charles Mok explains sleep apnea as breathing pauses of 10 seconds or longer with a 3-4% drop in oxygen saturation. He covers how severity is scored by event frequency and describes polysomnography, the traditional in-lab test that measures oxygen, brain activity, chest movement, and position, while noting the challenge of sleeping normally in an unfamiliar environment.
Questions this video answers
At least 10 seconds.
A drop in oxygen saturation of at least 3% or 4% (depends on which criteria are used).










