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Resistance and reactance in patients undergoing coronary artery bypass
A Bottoni1, D Marco, G Pereira da Costa Oliveira
1UNIFESP-EPM, Médico do GANEP (Grupo de Apoio de Nutrição Enteral e Parenteral), Hospital Beneficência Portuguesa, São Paulo, SP, Brazil.
Nutricion Hospitalaria
|July 24, 2003
Summary
Heart surgery impacts resistance and reactance, with longer extracorporeal circulation times and more grafts leading to significant decreases. These findings are crucial for understanding post-operative recovery in cardiac patients.
Area of Science:
- Cardiology
- Thoracic Surgery
- Biomedical Engineering
Background:
- Coronary artery bypass grafting (CABG) is a common cardiac surgery.
- Extracorporeal circulation (ECC) is a critical component of CABG.
- Understanding physiological changes post-CABG is essential for patient management.
Purpose of the Study:
- To investigate the impact of surgical variables on bioelectrical impedance parameters.
- To evaluate the relationship between perfusion duration, number of grafts, and post-operative resistance and reactance.
- To assess changes in resistance and reactance following cardiac surgery.
Main Methods:
- Seventy-seven patients undergoing CABG were studied.
- Bioelectrical impedance analysis was used for measurements.
- Extracorporeal circulation time was categorized into four levels.
Main Results:
- A significant decrease in reactance was observed post-surgery, particularly with longer ECC times (p = 0.01).
- Both resistance and reactance showed significant differences based on gender (p < 0.001).
- The number of grafts significantly influenced resistance and reactance (p = 0.001).
Conclusions:
- Post-operative decreases in resistance and reactance are linked to the surgical procedure itself.
- Extracorporeal circulation duration and the number of grafts are significant factors affecting these physiological changes.
- These findings highlight the importance of monitoring bioelectrical impedance parameters in cardiac surgery recovery.