2025. 44. PRELIMINARY ASSESSMENT OF THE EFFECTIVENESS OF COMBINED FASCIA ILIACA BLOCK AND LOW-DOSE SPINAL ANESTHESIA IN HIP REPLACEMENT SURGERY FOR FRAIL ELDERLY PATIENTS. Vietnam Journal of Community Medicine. 66, CĐ13- HNKH Gây mê Hồi sức (Sept. 2025). DOI:https://doi.org/10.52163/yhc.v66iCD13.3210.