M Mjid1, Y Ouahchi2, S Toujani2, H Snen2, N Ben Salah3, A Ben Hmida4, B Louzir3, N Mhiri2, J Cherif2, M Beji2. 1. Unité de recherche 12SP06, service de pneumologie, hôpital La Rabta, faculté de médecine de Tunis, université de Tunis El Manar, 1007 Tunis, Tunisie. Electronic address: mjid_meriem@hotmail.fr. 2. Unité de recherche 12SP06, service de pneumologie, hôpital La Rabta, faculté de médecine de Tunis, université de Tunis El Manar, 1007 Tunis, Tunisie. 3. Service de pneumologie, hôpital Mongi Slim, faculté de médecine de Tunis, université de Tunis El Manar, Tunis, Tunisie. 4. Service de médecine préventive, faculté de médecine de Tunis, université de Tunis El Manar, Tunis, Tunisie.
Abstract
The apnoea-hypopnoea index (AHI) is the primary measurement used to characterize the obstructive sleep apnoea-hypopnoea syndrome (OSAHS). Despite its popularity, there are limiting factors to its application such as night-to-night variability. AIM: To evaluate the variability of AHI in the OSAHS. PATIENTS AND METHODS: A prospective study was designed in our university hospital's sleep unit. Adults with clinical suspicion of OSAHS underwent 2 consecutive nights of polysomnographic recording. The population was divided in two groups according to an AHI>or<10. Patients with psychiatric disorders or professions that might result in sleep deprivation or an altered sleep/wake cycle were excluded. RESULTS: Twenty patients were enrolled. The mean age was 50.6±9.3 years. OSAHS was mild in 4 cases, moderate in 6 cases and severe in 8 cases. AHI was less than 5 in two cases. AHI values were not significantly altered throughout both recording nights (33.2 vs. 31.8 events/h). A significant positive correlation was found between AHI measured on the first and the second night. However, a significant individual variability was noted. Comparison between both patient's groups showed a correlation between AHI and the body mass index. CONCLUSION: This study demonstrates that the AHI in OSAHS patients is well correlated between two consecutive nights. However, a significant individual variability should be taken into consideration, especially when AHI is used in the classification of OSAHS or as a criterion of therapeutic success.
The apnoea-hypopnoea index (AHI) is the primary measurement used to characterize the obstructive sleep apnoea-hypopnoea syndrome (OSAHS). Despite its popularity, there are limiting factors to its application such as night-to-night variability. AIM: To evaluate the variability of AHI in the OSAHS. PATIENTS AND METHODS: A prospective study was designed in our university hospital's sleep unit. Adults with clinical suspicion of OSAHS underwent 2 consecutive nights of polysomnographic recording. The population was divided in two groups according to an AHI>or<10. Patients with psychiatric disorders or professions that might result in sleep deprivation or an altered sleep/wake cycle were excluded. RESULTS: Twenty patients were enrolled. The mean age was 50.6±9.3 years. OSAHS was mild in 4 cases, moderate in 6 cases and severe in 8 cases. AHI was less than 5 in two cases. AHI values were not significantly altered throughout both recording nights (33.2 vs. 31.8 events/h). A significant positive correlation was found between AHI measured on the first and the second night. However, a significant individual variability was noted. Comparison between both patient's groups showed a correlation between AHI and the body mass index. CONCLUSION: This study demonstrates that the AHI in OSAHS patients is well correlated between two consecutive nights. However, a significant individual variability should be taken into consideration, especially when AHI is used in the classification of OSAHS or as a criterion of therapeutic success.
Authors: Armin Steffen; Julia T Hartmann; Inke R König; Madeline J L Ravesloot; Benedikt Hofauer; Clemens Heiser Journal: Sleep Breath Date: 2018-09-05 Impact factor: 2.816
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