“44. PRELIMINARY ASSESSMENT OF THE EFFECTIVENESS OF COMBINED FASCIA ILIACA BLOCK AND LOW-DOSE SPINAL ANESTHESIA IN HIP REPLACEMENT SURGERY FOR FRAIL ELDERLY PATIENTS”, YHCĐ, vol. 66, no. CĐ13- HNKH Gây mê Hồi sức, Sept. 2025, doi: 10.52163/yhc.v66iCD13.3210.