A Step Forward for Better Interpreting the Apnea-Hypopnea Index

A Step Forward for Better Interpreting the Apnea-Hypopnea Index.

1839 Editorial—Farre et al. Sir William Thomson, 1st Baron Kelvin, and one of the pillars in the history of physics and engineering wrote a few sentences that became a traditional citation: “ I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowle...

Is Apnea-Hypopnea Index a proper measure for Obstructive Sleep Apnea severity?

Effect of the definition of hypopnea on apnea/hypopnea index.

The objective of this study was to determine whether different decreases in oxygen saturation (SaO2) or the presence of electroencephalographic arousals (EEGA) in the definition of hypopnea modify hypopnea index and apnea/hypopnea index and the prevalence of obstructive sleep apnea/hypopnea syndrome (OSAHS). A total of 20 polysomnographies performed in patients with OSAHS were analyzed. There a...

is apnea-hypopnea index a proper measure for obstructive sleep apnea severity?

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Apnea-hypopnea index: time to wake up

Despite the widespread use of the apnea-hypopnea index in research, its scientific and statistical properties have not been examined thoroughly. The index may be viewed either as a rate (number of events per hour of sleep) or as a ratio of two variables (number of events/number of hours of sleep). When considered as a rate, the apnea-hypopnea index may be modeled as the dependent variable, prov...