Effectiveness of Treatment Apnea-Hypopnea Index: A Mathematical Estimate of the True Apnea-Hypopnea Index in the Home Setting

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?

Choice of oximeter affects apnea-hypopnea index.

STUDY OBJECTIVES Current Medicare guidelines include an apnea-hypopnea index (AHI) > or = 15 events per hour, in which all hypopneas must be associated with 4% desaturation, to qualify for reimbursement for therapy with continuous positive airway pressure (CPAP). The present data demonstrate the effect of pulse oximeter differences on AHI. DESIGN Prospective study, blinded analysis. SETTING...

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...

Prediction of the apnea-hypopnea index from overnight pulse oximetry.

STUDY OBJECTIVE s: To compare the relative usefulness of the different indexes derived from pulse oximetry in the diagnosis of obstructive sleep apnea (OSA), and to determine if a combination of these indexes improves the prediction of the apnea-hypopnea index (AHI) measured by polysomnography. DESIGN Prediction model developed from 224 patients, validated prospectively in 101 patients from t...