[Measurements of extracellular water volume by bioelectrical impedance analysis during perioperative period of esophageal resection].
Segmental bioelectrical impedance analysis (BIA) was conducted in five patients who underwent esophageal resections. Resistance values fitted at zero frequency (R0) in each body segment (arm, trunk and leg) were determined before the induction of anesthesia, at the end of surgery and on the second or third postoperative day. Extracellular water volume (ECW) in each body segment was estimated using the equation derived from the cell suspension theory. ECW in whole body was obtained from the sum of each body segment. R0 in trunk and leg significantly decreased at the end of surgery compared to the values before the induction of anesthesia (P < 0.05). The change ratio of R0 in trunk before the induction of anesthesia was significantly lower at the end of surgery than that in arm (P < 0.05), resulting from the most striking fluid accumulation in the trunk. Postoperatively, R0 in all body segments, however, appeared to decrease similarly compared to the values before the induction of anesthesia, suggesting the redistribution phenomena of extracellular water among body segments. The correlation (r = 0.90, P < 0.001) and good agreement [bias = 0.01 (L)] between net fluid balances and estimates of ECW changes in whole body suggest that BIA allows close monitoring of tissue hydration during perioperative period by providing estimates of ECW in body segments.
Tatara
T
T
Department of Anesthesiology, Kyorin University School of Medicine, Tokyo.
Tsuzaki
K
K
D000368:Aged; D001823:Body Composition; D001834:Body Water; D017097:Electric Impedance; D004938:Esophageal Neoplasms / Q000601:surgery; D016629:Esophagectomy; D005110:Extracellular Space / Q000378:metabolism; D006801:Humans