title: Occipital C1-C2 neuromodulation decreases body mass and fat stores and modifies activity of the autonomic nervous system in morbidly obese patients--a pilot study.
abstract: BACKGROUND
  Autonomic and vagal neuromodulation has been suggested for the treatment of morbid obesity. Occipital nerves remain in close anatomical relation to vagal nerve roots at the entrance to medulla oblongata. The aim of the study was to evaluate the effect of C1-C2 occipital neuromodulation on autonomic activity, body mass, and composition.
  
  
  METHODS
  Five obese patients were included in the study (three women and two men, BMI 43-49, average age 43.3, range 24-55). Two electrodes were placed bilaterally in the C1-C2 region subcutaneously under local anesthesia. Stimulation was started 24 h after implantation and continued for 8 weeks. Patients activated stimulators for 12 h every day and turned the stimulators off at night. No other treatment including diet or change in lifestyle was introduced during the study. The following parameters were evaluated: body mass (0, 4th, and 8th week), body composition (bioimpedance study), food intake, quality of life, and heart rate variability (HRV) (0 and 8th week).
  
  
  RESULTS
  No adverse events were observed in this group. One patient reported amelioration of constipation and one reported two incidents of salivation. The average body mass decrease was 5.6 kg in 4 weeks and 8.7 kg in 8 weeks. Body composition study showed a 2-month decrease in body fat of 7.9 kg on average. HRV revealed increased parasympathetic tone (LF/HF 4.4 ± 4.3 SD vs. 1.6 ± 1.7 SD).
  
  
  CONCLUSIONS
  C1-C2 occipital stimulation seems being capable of decreasing body mass and affecting a positive shift in body composition and significantly increases the activity of the autonomic nervous system.
authors: Department of General, Oncology and Gastrointestinal Surgery, St. Anna Memorial Hospital, ul. Barska 16/20, 02-315, Warsaw, Poland. sobockij@gmail.com
authors: Jacek
authors: J
authors: Sobocki
authors: Roman M
authors: RM
authors: Herman
authors: Mariusz
authors: M
authors: Fraczek
mesh_terms: D000328:Adult; D001341:Autonomic Nervous System / Q000503:physiopathology*; D001823:Body Composition; D050218:Body Fat Distribution; D015992:Body Mass Index; D002408:Catheters, Indwelling; D002574:Cervical Vertebrae; D004435:Eating; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D009767:Obesity, Morbid / Q000503:physiopathology / Q000628:therapy*; D009778:Occipital Lobe / Q000503:physiopathology*; D010865:Pilot Projects; D011788:Quality of Life; D013116:Spinal Cord / Q000503:physiopathology*; D062187:Spinal Cord Stimulation / Q000295:instrumentation; D013997:Time Factors; D004561:Transcutaneous Electric Nerve Stimulation / Q000295:instrumentation*; D016896:Treatment Outcome; D055536:Vagus Nerve Stimulation / Q000295:instrumentation; D015431:Weight Loss