Analysis of mean transcutaneous capnography in consecutive patients undergoing polysomnography / Análise da capnografia transcutânea média em indivíduos consecutivamente submetidos à polissonografia

Transcutaneous capnography is a noninvasive method useful for analysis of the behavioral tendency of transcutaneous CO2 pressure (PtcCO2) in patients undergoing polysomnography, to evaluate respiratory sleep disorders. Objective Determine normative PtcCO2 values in normal patients undergoing polysomnography. Method One hundred seventy-nine patients who underwent polysomnography with simultaneous PtcCO2 measurement 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. Conclusion Global mean values of PtcCO2 in 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 PtcCO2 values for normal individuals. .

A capnografia transcutânea é um método não invasivo útil para análise da tendência comportamental da pressão de CO2 transcutânea (PtcCO2)1,2,3 em pacientes submetidos à polissonografia para análise de transtornos respiratórios do sono. Objetivo Determinar valores normativos da PtcCO2 em pacientes normais submetidos à polissonografia. Método Foram analisados 179 pacientes submetidos à polissonografia com medida concomitante da PtcCO2 através de um capnógrafo transcutâneo. Resultados O grupo classificado como normal (N=53) apresentou índice de apnéia/hipopnéia (AIH) <5 eventos/hora de sono e faixa etária variando de 7 a 76 anos. Conclusão Os valores da média global da PtcCO2 no grupo normal apresentaram distribuição gaussiana variando de 33,1 a 50,0 mmHg (DP 4.363). Tais achados permitiram a criação de valores normativos da PtcCO2 para indivíduos normais. .

Analysis of the clinicl characteristics in 148 patients with snoring and obstructive sleep apnea hypopnea syndrome / 复旦学报（医学版）

Objective To investigate the possible correlation of the clinical parameters, such as age, obesity, Epworth sleepiness score (ESS), with the severity of snoring and obstructive sleep apnea hypopnea syndrome (OSAHS). Methods One hundred and forty-eight patients with snoring during sleep admitted from May to Jul. 2008 were asked to answer the questions from a questionnaire concerning snoring, daytime sleepiness, and habits such as smoking and drinking, etc. All patients underwent at least a polysomnography (PSG) and the physical examination included height, weight, and body mass index (BMI). Age, BMI, the lowest SaO_2(%), ESS score, the biggest reduction of oxygen (%), a total suspension of time, the average correlation between respiratory disorder index (RDI) applied computing Pearson correlation test. Simple snoring and OSAHS group of mild, moderate and severe inter-group comparison analysis using generalized linear models. Results The prevalence of OSAHS was increased with age, higher in males than in females. A statistically significant correlation between ESS, BMI, the lowest SaO_2 with the RDI was detected. The difference of ESS, the lowest SaO_2 and the BMI was significant between the different serious patients (P<0.05). Conclusions OSAHS has a high morbidity rate in outpatients with snoring. Age and obesity are liability factors of OSAHS. BMI, the lowest SaO_2, ESS and RDI have well correlationship, which can be used to assess the pathogenetic condition, even make a primary diagnosis.