title: Subcutaneous fat tissue thickness of the anterior neck and umbilicus in patients with obstructive sleep apnea.
abstract: OBJECTIVE
  To investigate the differences in thickness of subcutaneous fat tissue of the anterior neck and umbilicus of patients with and without obstructive sleep apnea (OSA), the relationship between thickness of subcutaneous fat tissue of the anterior neck and umbilicus and polysomnographic findings, and the influence of body mass index (BMI), anthropometric findings, and gender.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  Tertiary care university hospital.
  
  
  METHODS
  Seventy-three patients with OSA and 24 non-OSA patients were evaluated with polysomnography for 1 night. Anthropometric parameters and BMI were also investigated. Subcutaneous fat tissue thickness of anterior neck and umbilicus was assessed using ultrasound. The thickness of subcutaneous fat tissue adjacent to the submandibular gland, isthmus, hyoid, suprasternal notch, and umbilicus was measured with ultrasound. Data analysis was performed using SPSS.
  
  
  RESULTS
  Apnea-hypopnea index (AHI) was significantly and positively correlated with age (P = .016, r (2) = 0.244), BMI (P < .001, r (2) = 0.416), and anthropometric findings (waist circumference P < .001, r (2) = 0.337; hip circumference P = .008, r (2) = 0.269; neck circumference P = .002, r (2) = 0.309). Minimum oxygen saturation was significantly, negatively correlated with age (P = .002, r (2) = -0.310), BMI (P < .001, r (2) = -0.404), and anthropometric findings (waist circumference P = .005, r (2) = -0.281, hip circumference P < .001, r (2) = -0.353, neck circumference P = .010, r (2) = -0.261). There were no significant differences between the OSA and non-OSA groups with respect to age (P = .178), gender (P = .189), or ultrasonographic findings for subcutaneous fat tissue thickness adjacent to the submandibular gland (P = .480), thyroid isthmus (P = .311), suprasternal notch (P = .950), umbilicus (P = .691), or hyoid (P = .159). Neck circumference (P = .039) and BMI (P = .014) were significantly higher in the OSA group.
  
  
  CONCLUSIONS
  These indicate that anterior neck and umbilical subcutaneous fat tissue thickness may not contribute to the severity of OSA.
authors: Department of Otolaryngology, Fatih University, Ankara, Turkey. kserifeboynukalin@yahoo.com
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