Estudo das repercussões hemodinâmicas através da cardioimpedância durante o uso de metilmetacrilato em cirurgia de artroplastia de quadril sob raquianestesia

Abstract

Aging promotes the onset of chronic diseases, including osteoarthritis. Hip arthroplasty procedure has been commonly often the use of methylmethacrylate bone cement (MMA) has been used in the surgical procedure. On the other hand, significant hemodynamic changes are described in the cementation procedure. Spinal anesthesia is an anesthetic that produces less hemodynamic effects and better postoperative analgesia compared to general anesthesia for surgery arthroplasty. However, this particular surgical procedure (hip arthroplasty) such changes remain to be investigated. To evaluate the hemodynamic effects through cardioimpedance technique in elderly patients undergoing surgery for hip arthroplasty with the use of MMA for prosthetic hip and spinal. Twelve patients of both sexes, > 65 years, with orthopedic indication for hip arthroplasty were studied. The subjects received preanesthetic evaluation and underwent preoperative laboratory. From then underwent surgery for hip arthroplasty with use of spinal anesthesia and MMA cement. Patients were haemodynamically monitored by impedance cardiography, oxygen saturation and blood pressure intraoperative, when awake, during anesthesia induction, installing the MMA cement and after this procedure. After volume expansion, we observed that there was increase in CO when compared to spinal anesthesia, cementing, insertion, and reduction of the prosthesis at surgery (P <0.05). These results were somewhat attenuated in the presence of ephedrine. However, the SV underwent changes at aforementioned event on the presence or not of drugs. On the other hand, HR, CI and SVR has a few changed during the studied event. The CO, CI and the SV was correlated with body mass (r=0.81, 0.60 and 0.67 respectively), SV was negatively correlated with age (r=-0.67), the CI was negatively correlated with NYHA functional class (r=-0.61) and CO was positively correlated with the amount of ephedrine administered (r= 0.70).Conclusion: The surgical procedure for hip arthroplasty under spinal anesthesia with MMA produces haemodynamic changes and cardioimpedance was a useful tool to guide the procedures and conduct of the intraoperative considering as interesting technique for noninvasive monitoring.