الفهرس 
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Abstract
This study was perfonned to assess haemodynalnic and blood gasometric changes which could occure with general versus subarachnoid anaesthesia in 36 elderly patients sublnitted for lower limb orthopaedic surgery.
Patients were premedicated with SIng midazolam intramuscularly 30 min. before anaesthesia. A central venous line was inserted for CVP monitoring. Radial artery was cannulated for blood gas sampling. Patients were randomly allocated into two groups 18 patients each.
General anaesthesia group: Group ”G”:
Anaesthesia was induced by fentanyl 0.7 ug/kg and thiopentone sodium 3-4 mg /kg followed by tracheal intubation which was facilitated by a bolus dose ofvecuronium 0.1 mg /kg Maintenance of anaesthesia was achieved by halothane 0.2-0.4% in N20 : 02 (60%:40%), controlled ventilation under the effect of vecuronium infusion 1 ug/kg /min., fentanyl in a dose of 0.5 ug/kg was given after one hour to keep adequate analgesia. Reversal of the residual effect of muscle relaxation was achieved by prostigmine 0.04 mg/kg and atropine 0.02 mg/kg .
Subarachnoid anaesthesia group: Group ”S”:
Fluid preload using 500ml. of lactated Ringer solution was given before starting the regional block. Subarachnoid blockade was done by 2ml. of heavy bupivacaine 0.5% in the 3-4 lumbar interspace. Patients were given 40% oxygen via Venturi mask.