PURPOSE: To evaluate the correlation of the adjusted neck circumference score (ANCS) with severity of obstructive sleep apnea (OSA).
METHODS: All patients referred to our sleep center were screened using the ANCS. This consists of the sum of four measures including neck circumference (cm=#points), history of hypertension (4 points), history of snoring (3 points) and history of night-time choking or gasping (3 points). The sum is compared to the polysomnogram results. Patients with OSA (Apnea Hypopnea Index (AHI)>5) were included.
RESULTS: 554 total patients with OSA (AHI>5) were included: 341 patients (62%) were male and 213 patients (38%) were female with similar distribution of OSA severity. 215 patients (39%) had mild OSA (AHI 5 to 15) with an average age or 46 years, average body mass index (BMI) of 31 Kg/sq meter and ANCS of 45. 152 patients (27%) had moderate OSA (AHI 16 to 30) with an average age of 50, average BMI 33 and ANCS of 47. 187 patients (34%) had severe OSA (AHI>30) with an average age of 51, BMI 36 and ANCS of 50. There was no significant correlation of the ANCS with the AHI (R=0.12 for moderate OSA and R=0.19 for severe OSA). There was a significant difference when comparing ANCS of mild OSA to moderate and severe OSA (p<0.0001).
CONCLUSIONS: The ANCS can be used to distinguish mild from moderate to severe OSA. However, the score does not show a significant correlation with AHI.
CLINICAL IMPLICATIONS: While the ANCS provides a general assessment of the severity of OSA, it does not discriminate the precise severity. A better clinical screening tool is needed to prioritize patients for polysomnogram.
DISCLOSURE: The following authors have nothing to disclose: Eldrige Pineda, Daniel Fitelson, Joseph Rahill, Anne O'Donnell, Tunay Kuru, Richard Waldhorn, Timothy Ruse
No Product/Research Disclosure Information