Background: Obstructive sleep apnoea (OSA) is considered positional (POSA) when sleep disordered breathing (SDB) events occur predominantly in supine position. Scarce data from Indian sub-continent regarding POSA are available.
Methods: Records of patients who underwent two nights of nocturnal polysomnography (PSG) from January 2018 to June 2019 in the Department of Pulmonary Medicine, Government Medical College and Hospital, Chandigarh were evaluated. Patients were diagnosed as POSA if apnoea-hypopnoea index (AHI) was ≥5/h and supine AHI was at least two times higher than non-supine AHI (NSAHI).
Results: Of the 130 patients studied, 100 were diagnosed as OSA; of these 68 PSG studies were analysed. Fourteen of the 68 (20.6%) had POSA. Both groups were similar in age, gender, body mass index (BMI) and quality of sleep. Mean AHI (P=0.001), NSAHI (P<0.001), right AHI (P=0.002), oxygen desaturation index (ODI) (P=0.007), number of subjects with oxygen saturation measured by pulse oximetry (SpO2) <90% (P=0.032) and <80% (P=0.031) and percentage of total sleep time (TST) with SpO2 <90% (P=0.031) was significantly lesser in POSA than non-POSA patients. Mean minimum SpO2 was significantly higher in POSA than non-POSA (P=0.025). Post continuous positive airway pressure (CPAP) trial, though average CPAP pressures differed significantly (P=0.001), resultant AHI and other PSG parameters in the two groups were not statistically different, suggesting adequate response to treatment.
Conclusions: Identification of POSA is a key step for further studies aimed at deciphering wide array of issues which can be associated with this entity.
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