ABSTRACT
Abstract Introduction Upper airway resistance may accompany eustachian dysfunction and alter middle ear pressure in patients with obstructive sleep apnea syndrome. Objective To investigate effects of obstructive sleep apnea syndrome and continuous positive airway pressure treatment on eustachian tube functions. Methods Forty-two mild obstructive sleep apnea syndrome patients, 45 moderate obstructive sleep apnea syndrome patients, 47 severe obstructive sleep apnea syndrome patients with continuous positive airway pressure therapy, 32 severe obstructive sleep apnea syndrome patients without continuous positive airway pressure therapy, and 88 individuals without sleep apnea (controls) were included. Tympanometric parameters of groups were compared. Results Right middle ear pressures in mild and moderate obstructive sleep apnea syndrome groups did not differ significantly from that of control group (p = 0.93 and p = 0.55), as was also true of the left middle ear pressures (p = 0.94 and p = 0.86). Right middle ear pressure was significantly higher in severe obstructive sleep apnea syndrome groups than in the control group, as was the left middle ear pressure (p < 0.001). Middle ear pressure (negative) was significantly lower in severe obstructive sleep apnea syndrome patients with continuous positive airway pressure therapy compared to those without (p < 0.001). Right ear type B and C tympanogram frequencies were significantly higher in patients with severe obstructive sleep apnea syndrome without continuous positive airway pressure therapy (12.4%) than in the controls (0%) (p = 0.02). Left ear type B or C tympanogram frequencies were significantly higher in patients with severe obstructive sleep apnea syndrome without continuous positive airway pressure therapy (21.9%) than in the controls (0%) (p = 0.002). Conclusion Mild and moderate obstructive sleep apnea syndrome did not affect middle ear pressure but severe obstructive sleep apnea syndrome may increase the (negative) middle ear pressure. In severe obstructive sleep apnea syndrome patients, long-term continuous positive airway pressure therapy may normalize middle ear pressure.
Resumo Introdução A resistência das vias aéreas superiores pode se acompanhar de disfunção da trompa de Eustáquio e alterar a pressão na orelha média em pacientes com síndrome da apneia obstrutiva do sono Objetivo Investigar os efeitos do tratamento da síndrome da apneia obstrutiva do sono com pressão positiva contínua nas vias aéreas nas funções da trompa de Eustáquio. Método Foram incluídos 42 pacientes com síndrome da apneia obstrutiva do sono leve, 45 pacientes com síndrome da apneia obstrutiva do sono moderada, 47 pacientes com síndrome da apneia obstrutiva do sono grave submetidos à terapia de pressão positiva contínua nas vias aéreas, 32 pacientes com síndrome da apneia obstrutiva do sono grave sem terapia de pressão positiva contínua nas vias aéreas e 88 indivíduos sem apneia do sono (controle). Os parâmetros timpanométricos dos grupos foram comparados. Resultados As pressões na orelha média direita nos grupos com síndrome da apneia obstrutiva do sono leve e moderada não diferiram significantemente das do grupo controle (p = 0,93 e p = 0,55), assim como nas pressões da orelha média esquerda (p = 0,94 e p = 0,86). A pressão na orelha média direita foi significantemente maior nos grupos com síndrome da apneia obstrutiva do sono grave do que no grupo controle, assim como a pressão na orelha média esquerda (p < 0,001). A pressão negativa na orelha média foi significantemente menor nos pacientes com síndrome da apneia obstrutiva do sono grave submetidos à terapia com pressão positiva contínua nas vias aéreas em comparação com aqueles que não receberam tratamento (p < 0,001). As frequências dos timpanogramas do tipo B e C da orelha direita foram significantemente maiores em pacientes com síndrome da apneia obstrutiva do sonograve que não receberam terapia com pressão positiva contínua nas vias aéreas (12,4%) do que nos controles (0%) (p = 0,02). As frequências dos timpanogramas do tipo B ou C na orelha esquerda foram significantemente maiores em pacientes com síndrome da apneia obstrutiva do sonograve que não receberam terapia com pressão positiva contínua nas vias aéreas (21,9%) do que nos controles (0%) (p = 0,002). Conclusão Síndrome da apneia obstrutiva do sono leve e moderada não afetou a pressão da orelha média, mas a síndrome da apneia obstrutiva do sono grave pode aumentar a pressão negativa da orelha média. Em pacientes com síndrome da apneia obstrutiva do sono grave, a terapia em longo prazo com pressão positiva contínua nas vias aéreas pode normalizar a pressão da orelha média.
Subject(s)
Humans , Sleep Apnea Syndromes , Sleep Apnea, Obstructive/therapy , Eustachian Tube , Acoustic Impedance Tests , Continuous Positive Airway PressureABSTRACT
The Nose/Ear Distress Syndrome is defined as the combination of nasal septal deformity and eustachian dysfunction in the absence of any other pathology (McNicoll and Scanlan,1979). Until now, there have been few literatures strongly mentioned about it in the scientific role, and this relationship has not been studied in Thai people. The relationship between deviated nasal septum (DNS) and middle ear pressure (MEP) was then studied with the audiometry, tympanometry, rhinomanometry, and acoustic rhinometry. A total of 80 patients with DNS was recruited and divided into 2 groups; The allergic rhinitis group (n = 40) and the control group (n = 40). Each group could be further divided into 2 subcategories: (a) DNS to Right (nasal airflow: right side< left side) (n = 44) (b) DNS to left (nasal airflow: left side< right side) (n = 36). The mean of patient's age was 33.5 years (range: 11-56 years). The mean of minimal cross-sectional area in patients with DNS and its length from anterior nostril (after decongestion) were 0.7 cm2; 1.6 cm on the left side and 0.7 cm2;1.4 cm on the right side, respectively. The mean of MEP (n = 80) was - 17.3 daPa (S.D.=13.4) on the left side and - 18.7 daPa (S.D.=14.3) on the right side. In each subcategory of both groups, there were no significant differences in MEP between both sides (p > 0.05) although there were significant differences in airflow and resistance (p < 0.05). Furthermore, the difference of nasal airflow or nasal resistance between both sides did not significantly correlate with the difference of MEP (p > 0.05). The number of patients who had auditory symptom was 9 (22.5%) in the control group and 4 (10%) in the allergic rhinitis group. There were no significant differences in incidence of auditory symptom between both groups (p > 0.05). Between the patients who had auditory symptom (n = 13) and had no auditory symptom (n = 67), the difference of nasal airflow, nasal resistance, and MEP between both sides did not differ significantly (p > 0.05). In summary, we found no relationship between DNS and MEP in this study.
ABSTRACT
N2O can diffuse in and/or out the middle ear cavities and it may alter the middle ear pres-sure. This study was performed to investigate the effect of N2O discontinuation on the changes in middle ear pressure during general endotracheal anesthesia. We measured middle ear pres-sures and end-tidal NO concentrations at preanesthesia, immediately after N2O discontinuation and then at every five minutes for 60 minutes under either halothane or enflurane an- esthesia in two groups(group 1=50% administration of N2O in O2; group 2=60% administration of N2O in O2). The middle ear pressures after N2O discontinuation decreased slowly but they did not returned to the preanesthetic value in both groups. The end-tidal N2O concentrations decreased rapidly until five minutes and then they decresed slowly to the zero leve1 until 30 minutes after N2O discontinuation in both groups. The expected time of the middle ear pres-sure of preanesthesia value was 89.4 minutes in group 1 and 80.9 minutes in group 2 respectively. The middle ear pressure do not return to the level of preanesthesia at 60 minutes after N2O discontinuation while the end-tidal N2O concentration decrease to the zero level via 30 minutes after its discontinuation. Thus it is recommended that N2O administration should be discontinued at least 30 minutes before an application of tympanic membrane patch on the ear drum and N2O is carefully administered in patients with middle ear and/or upper airway disesses.
Subject(s)
Humans , Anesthesia , Ear , Ear, Middle , Enflurane , Halothane , Tympanic MembraneABSTRACT
N2O can diffuse in and/or out the middle ear cavities and it may alter the middle ear pres-sure. This study was performed to investigate the effect of N2O discontinuation on the changes in middle ear pressure during general endotracheal anesthesia. We measured middle ear pres-sures and end-tidal NO concentrations at preanesthesia, immediately after N2O discontinuation and then at every five minutes for 60 minutes under either halothane or enflurane an- esthesia in two groups(group 1=50% administration of N2O in O2; group 2=60% administration of N2O in O2). The middle ear pressures after N2O discontinuation decreased slowly but they did not returned to the preanesthetic value in both groups. The end-tidal N2O concentrations decreased rapidly until five minutes and then they decresed slowly to the zero leve1 until 30 minutes after N2O discontinuation in both groups. The expected time of the middle ear pres-sure of preanesthesia value was 89.4 minutes in group 1 and 80.9 minutes in group 2 respectively. The middle ear pressure do not return to the level of preanesthesia at 60 minutes after N2O discontinuation while the end-tidal N2O concentration decrease to the zero level via 30 minutes after its discontinuation. Thus it is recommended that N2O administration should be discontinued at least 30 minutes before an application of tympanic membrane patch on the ear drum and N2O is carefully administered in patients with middle ear and/or upper airway disesses.
Subject(s)
Humans , Anesthesia , Ear , Ear, Middle , Enflurane , Halothane , Tympanic MembraneABSTRACT
This study was carried out to observe and evaluate the middle ear pressure(MEP) change by nitrous oxide(N2O) and end tidal PCO2 during general anesthesia with halothane or enflurane. MEP was measured during general anesthesia by impedance audiometer(GSI 28 Auto tymp model) in 50 patients who were relatively healthy without upper respiratory tract infection and otologic problems from August 1987 at Chonbuk National University Hospital. The results were as follows: 1) During general anesthesia with 100% O2 and halothane or enflurane, MEP was decreased progressively under the preinduction level with time. 2) The decrease in MEP during general anesthesia with 100% O2 and halothane or enflurane was reversed by relative hypoventilation, but MEP showed negative values in all patients. 3) End tidal PCO2 was increased progressively by relative hypoventilation and returned gradually to pre-hypoventilation level by normoventilation. 4) MEP was increased during general anesthesia using N2O, which is propotional to the concentration of N2O by 20 minutes. Thereafter, MEP remained increased until termination of N2O administration. From the above results, it is concluded that MEP is increased during anesthesia using N2O. MEP can also be affected by end tidal PCO2 even though physiologic range. Therefore, it is prudent to avoid N2O especially when hyperventilation is not adequately permitted during general anesthesia for middle ear surgery and patient with middle ear disease.