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Active core rewarming avoids bioelectrical impedance changes in postanesthetic patients
Alma Rebeca Gutiérrez-Cruz1, Bernardo Soto-Rivera, Bertha Alicia León-Chávez
1Laboratorio de Medicina Genómica, Hospital Regional "Primero de Octubre", Av, IPN, No, 1669, Mexico, D, F,, C,P, 07760, Mexico. jantgonzalez@issste.gob.mx.
BMC Anesthesiology
|February 18, 2011
Summary
Postoperative hypothermia significantly alters bioelectrical impedance (BI) in patients undergoing laparoscopic cholecystectomy. Active core rewarming effectively maintains normal body temperature and stable BI, preventing hypothermia-related complications.
Area of Science:
- Anesthesiology
- Physiology
- Medical Devices
Background:
- Postoperative hypothermia is a frequent complication after laparoscopic cholecystectomy.
- Hypothermia induces electrophysiological and biochemical changes affecting membrane properties and bioelectrical impedance (BI).
Purpose of the Study:
- To investigate the relationship between core body temperature and bioelectrical impedance (BI).
- To evaluate the efficacy of active core rewarming versus passive rewarming in maintaining body temperature and BI during surgery.
Main Methods:
- Sixty patients undergoing laparoscopic cholecystectomy were divided into active core rewarming and passive external rewarming groups.
- Bioelectrical impedance (BI) was measured using a 4-contact electrode system on the deltoid muscle.
- Body temperature, hemodynamics, respiratory rate, blood gases, and shivering were monitored.
Main Results:
- Bioelectrical impedance (BI) increased as body temperature decreased, with highest BI (95 ± 11 Ω) at the lowest temperatures (35.5 ± 0.5°C).
- Active core rewarming maintained body temperature above 36.5°C, resulting in stable, lower BI values (68 ± 3 Ω).
- Active rewarming reduced hemodynamic values, respiratory rate, and shivering compared to the control group, with potassium levels remaining stable.
Conclusions:
- Bioelectrical impedance (BI) is a temperature-dependent parameter, independent of shivering.
- Active core rewarming is beneficial in preventing accidental hypothermia and associated complications during laparoscopic cholecystectomy.
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