Effect of the definition of hypopnea on apnea/hypopnea index
Medicina (B.Aires)
; Medicina (B.Aires);63(2): 119-124, 2003. tab, graf
Article
in En
| LILACS
| ID: lil-338575
Responsible library:
BR1.1
ABSTRACT
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 are four different definitions of hypopnea > or = 30% reduction in airflow or 50% decrease in abdominal movement associated with decreases SaO2 > or = 3% (type 1); decreases SaO2 > or = 3% or EEGA (type 2); decreases SaO2 > or = 4% (type 3); decreases SaO2 > or = 4% or EEGA (type 4). The prevalence of OSAHS was calculated for an apnea/hypopnea index (AHI) > or = 10 and > or = 15. Hypopnea index (HI) and AHI types 2 and 4 were higher than type 3 (HI type 2 20 +/- 10.6, type 4 18.6 +/- 10, type 3 11.4 +/- 10, p < 0.001; AHI type 2 23.3 +/- 11.6, type 4 21.4 +/- 11.2, type 3 14.7 +/- 11.6, p < 0.001). No differences were observed between HI and AHI types 1 and 2 (HI type 1 17.4 +/- 10, type 2 20 +/- 10.6; AHI type 1 20.6 +/- 11.8, type 2 23 +/- 11.6, p > 0.05). The prevalence of OSAHS was 30-55% in type 3, 70-85% in type 4 (p < 0.05), and 70-85% in types 1 and 2 (p > 0.05). In our patient's population, the presence of EEGA in the definition of hypopnea significantly increased the HI, the AHI and the prevalence of OSAHS when associated with a > or = 4% decrease in SaO2
Full text:
1
Index:
LILACS
Main subject:
Apnea
/
Terminology
Type of study:
Diagnostic_studies
/
Prevalence_studies
/
Risk_factors_studies
Limits:
Adult
/
Humans
Country/Region as subject:
America do sul
/
Argentina
Language:
En
Journal:
Medicina (B.Aires)
Journal subject:
MEDICINA
Year:
2003
Type:
Article