title: Monitoring of body water composition by the simultaneous use of bioelectrical impedance analysis and Crit-Line(®) during hemodialysis.
abstract: BACKGROUND
  Bioelectrical impedance analysis (BIA) is a non-invasive method to estimate total body water (TBW) and extracellular water (ECW) volume. Crit-Line(®) (CL), on the other hand, assesses intravascular water (IVW) volume. We evaluate continuous changes in body water composition during hemodialysis (HD) with concurrent use of BIA and CL.
  
  
  METHODS
  BIA at the start and the end of the HD session was measured using a BIA device. To investigate the shifting pattern of body water composition, patients were subjected to simultaneous monitoring of BIA with CL.
  
  
  RESULTS
  Both TBW resistance (Rt) and ECW resistance (Re) increased in response to changes in the ultrafiltration (UF) ratio. There was a positive correlation between ΔRe/Rt and the UF ratio, and the ratio of Re/Rt at the end of HD was significantly higher than that at the start of HD. Simultaneous monitoring of BIA with CL showed a parallel shift of the change in the Re (ΔRe) and the change in hematocrit (ΔHt). In one patient with increasing inflammatory response, change in ΔHt was dissociated from change in ΔRe. One hyponatremic patient showed a different pattern of changing ΔRe between the first half and the latter half of the HD session.
  
  
  CONCLUSIONS
  Our study suggests that the concurrent use of BIA and CL may be a useful technique to simulate water shift patterns across the different compartments in HD.
authors: Division of Kidney and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, 3-25-8 Nishi-Shinbashi, Minato-ku, Tokyo, 105-8461, Japan, n-sugano@jikei.ac.jp.
authors: Naoki
authors: N
authors: Sugano
authors: Keitaro
authors: K
authors: Yokoyama
authors: Naohiko
authors: N
authors: Kato
authors: Yoichiro
authors: Y
authors: Hara
authors: Satoshi
authors: S
authors: Endo
authors: Jun
authors: J
authors: Mitome
authors: Taisei
authors: T
authors: Kin
authors: Goro
authors: G
authors: Tokudome
authors: Satoru
authors: S
authors: Kuriyama
authors: Tatsuo
authors: T
authors: Hosoya
authors: Takashi
authors: T
authors: Yokoo
mesh_terms: D000368:Aged; D001794:Blood Pressure / Q000502:physiology; D001823:Body Composition / Q000502:physiology; D001834:Body Water / Q000737:chemistry*; D017097:Electric Impedance; D005260:Female; D006400:Hematocrit / Q000379:methods*; D006801:Humans; D007010:Hyponatremia / Q000175:diagnosis / Q000453:epidemiology / Q000503:physiopathology; D007022:Hypotension / Q000175:diagnosis / Q000453:epidemiology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000295:instrumentation / Q000379:methods*; D006435:Renal Dialysis; D051436:Renal Insufficiency, Chronic / Q000378:metabolism / Q000503:physiopathology / Q000628:therapy*; D012307:Risk Factors; D013997:Time Factors