title: Analysis of mean transcutaneous capnography in consecutive patients undergoing polysomnography.
abstract: Transcutaneous capnography is a noninvasive method useful for analysis of the behavioral tendency of transcutaneous CO₂pressure (PtcCO₂) in patients undergoing polysomnography, to evaluate respiratory sleep disorders.
  
  
  OBJECTIVE
  Determine normative PtcCO₂values in normal patients undergoing polysomnography.
  
  
  METHODS
  One hundred seventy-nine patients who underwent polysomnography with simultaneous PtcCO₂measurement were assessed by means of a transcutaneous capnograph (TCM4 series from Radiomiter).
  
  
  RESULTS
  The group classified as normal (N=53) presented a apnea/hypopnea index (AHI) <5 events/per hour of sleep and their age groups varied between 7 and 76 years of age.
  
  
  CONCLUSIONS
  Global mean values of PtcCO₂in the normal group had a Gaussian distribution that varied between 33.1 and 50.0 mmHg (SD 4,363). Such findings allowed the establishment of normative PtcCO₂values for normal individuals.
authors.affiliation: Hospital Sarah, Brasília, DF, Brazil.
authors.forename: Giulio Cesare
authors.initials: GC
authors.lastname: Pinnola
authors.affiliation: Hospital Sarah, Brasília, DF, Brazil.
authors.forename: Patrícia Souza
authors.initials: PS
authors.lastname: Bastos
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D001785:Blood Gas Monitoring, Transcutaneous / Q000379:methods*; D019296:Capnography / Q000379:methods*; D002245:Carbon Dioxide / Q000097:blood; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography / Q000379:methods*; D012016:Reference Values; D018709:Statistics, Nonparametric; D013997:Time Factors; D055815:Young Adult
chemical_list: D002245:Carbon Dioxide