title: Interference of silicone breast implants on bioimpedance measurement of body fat.
abstract: BACKGROUND
  No study targeting the impact of silicone breast implants on body composition measured by bioimpedance analysis was identified.
  
  
  OBJECTIVE
  Aiming to clarify this question a prospective clinical study was designed.
  
  
  METHODS
  Adult candidates were submitted to conventional analysis at baseline and two months after the surgical intervention. In addition, unwrapped prostheses were positioned in the axillary cavity before operation and bioimpedance was measured, both with and without application of ultrasound gel for improved conductivity (sham implantation).
  
  
  RESULTS
  Patients (N = 20) were young and healthy (26.8 ± 3.6 years old, BMI 22.1 ± 3.7 kg/m(2)). In comparison with preoperative results, sham procedures pointed out increased body fat and body resistance (13.2 ± 5.6 vs 13.6 ± 5.4 kg, P = 0.017 and 523 ± 54 vs 569 ± 53 Ω, P = 0.003, respectively). Two-month follow-up confirmed the same pattern after surgical intervention, with minor discrepancies (13.2 ± 5.6 vs 13.8 ± 5.7 kg, P = 0.011 and 523 ± 54 vs 549 ± 62 Ω, P = 0.032, respectively). BMI remained stable and did not correlate with bioimpedance changes.
  
  
  CONCLUSIONS
  Silicone was recognized as adipose tissue. Difference in total body fat (approximately 600 g) was consistent with used amount.
authors.affiliation: Hospital das Clinicas, Sao Paulo, SP, Brazil.
authors.forename: Camila M
authors.initials: CM
authors.lastname: Yamaguchi
authors.forename: Joel
authors.initials: J
authors.lastname: Faintuch
authors.forename: Maira M
authors.initials: MM
authors.lastname: Silva
authors.forename: M
authors.initials: M
authors.lastname: Modolin
authors.forename: Silvia Y
authors.initials: SY
authors.lastname: Hayashi
authors.forename: I
authors.initials: I
authors.lastname: Cecconello
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism*; D000293:Adolescent; D000328:Adult; D016477:Artifacts; D001823:Body Composition; D015992:Body Mass Index; D019928:Breast Implantation / Q000379:methods; D018427:Breast Implants; D017097:Electric Impedance; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D011446:Prospective Studies; D055815:Young Adult