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Understanding my sleep apnea test

Posted by sleepyhead on February 07, 2006 at 17:55:58:

The patient sleep 1.8 of 2.8 hours, for a sleep efficiency of 65%. Sleep onset was normal at 14 min.

The percentages of the various stages of sleep were as follows: Stage 1 was 17%, stage 2 was 80%, stage 3 and 4 was 3% and stage REM 0%. The patient was on his left side 93% of the time and supine 7% of the baseline. The snoring related arousal index was high at 9.9 per hour. The spontaneous EEG arousal index was 3.8 per hour. 51 obstructive apneas and 1 mixed apnea were recorded. 43 obstructive hypopneas were recorded. The apnea-hypopnea index was severely increased at 52.1 per hour. The periodic leg movement index was normal at 0.5. The minimum oxygen saturation was 75%. While awake and resting in bed, the patient’s mean oxygen saturation was 95%. While asleep the patient spent 18% of the baseline with oxygen saturation below 80% and 90% and 1% of the baseline with oxygen saturation below 80%. The mean pulse was 69 beats per minute. Occasional PVC was noticed.

The patient slept 84% of a 5.3 hour CPAP tiltration. The overall apnea-hypopnea index fell to 11.2. CPAP was imitated at 4 cm of water pressure and increased to a maximum of 12 cm. On 12 cm of CPAP the patient had 12 min. of REM sleep, 65 min. of non-REM sleep, 5 hypopneas and an apnea-hypopnea index of 3.9. On CPAP at 11 cm the patient did almost as well. On 11 cm of CPAP the patient had 11 mins REM sleep, 88 min. of non-REM sleep. 11 hypopneas and an apnea-hypopnea index of 6. Pressures below 11 cm were inadequate to control the patients apneic episodes. REM sleep was also not achieved on lesser pressures.

Interpretation: This study shows the presence of severe obstructive sleep apnea with 52.1 apneic episodes per hour and a minimum oxygen saturation of 75%. Sleep apnea was adequately controlled with CPAP at 12 cm of water pressure.

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