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Cardiopulmonary and haemodynamic changes during total hip arthroplasty
L López-Durán1, A García-López, L Durán
1Orthopaedic Surgery and Traumatology Service, University Hospital San Carlos, Madrid.
International Orthopaedics
|January 1, 1997
Summary
This study on total hip arthroplasty found rapid hemodynamic and respiratory changes during surgery, including increased blood pressure and decreased oxygen levels. These changes were linked to cement insertion but not definitively to methylmethacrylate monomer.
Area of Science:
- Anesthesiology
- Orthopedic Surgery
- Cardiopulmonary Physiology
Background:
- Total hip arthroplasty (THA) is a common orthopedic procedure.
- Understanding perioperative hemodynamic and respiratory changes is crucial for patient safety.
- The role of bone cement and methylmethacrylate monomer in these changes requires further investigation.
Purpose of the Study:
- To prospectively investigate hemodynamic and respiratory alterations during total hip arthroplasty.
- To assess the impact of bone cement insertion on intramedullary pressure and physiological parameters.
- To explore the potential contribution of methylmethacrylate monomer to observed changes.
Main Methods:
- Prospective study of 30 patients undergoing THA for osteoarthrosis.
- Comparison between cemented (n=17) and uncemented (n=13) THA.
- Monitoring of pulmonary and cardiac function, blood methylmethacrylate monomer levels, intramedullary pressure, and transesophageal echocardiography.
- Analysis of immediate changes in mean arterial pressure, mean pulmonary artery pressure, arterial oxygen tension, and mixed venous PO2.
Main Results:
- Consistent appearance of two distinct echogenic patterns during surgery.
- Significant increase in intramedullary pressure upon cement insertion.
- Rapid onset (seconds) and sustained (minutes) hemodynamic changes: elevated blood pressures, decreased arterial and venous oxygen tension.
- Increased tissue oxygen consumption observed.
- Elevated methylmethacrylate monomer levels in venous blood post-cementation, but no direct correlation established with hemodynamic shifts.
Conclusions:
- Bone cement insertion during THA induces significant and immediate hemodynamic and respiratory disturbances.
- These perioperative changes are characterized by increased pressures and reduced oxygenation.
- The study found no conclusive evidence implicating methylmethacrylate monomer as the primary cause of these acute physiological alterations.