title: Haemodynamic effects of unilateral spinal anesthesia in high risk patients.
abstract: OBJECTIVE
  To assess whether a unilateral spinal anaesthesia using 0.5% hyperbaric Bupivacaine will restrict the sympathetic block to avoid the undesired cardio vascular effects.
  
  
  METHODS
  In this study 40 ASA III and IV patients aged between 60-90 years undergoing unilateral lower limb surgery were included. All patients received unilateral spinal anaesthesia using hyperbaric 0.5% Bupivacaine (1.1-1.8 ml according to patient's height). Patients were placed in the lateral position with operated side down and kept in this position for 10 minutes. Motor and sensory levels were assessed, and haemodynamic alterations were monitored for 30 minutes after initiation of spinal anaesthesia.
  
  
  RESULTS
  Unilateral spinal anaesthesia is very effective in restricting the sympathetic block as all high risk patients showed minimal haemodynamic changes following the technique.
  
  
  CONCLUSIONS
  Unilateral spinal anaesthesia is effective in restricting the sympathetic block in high risk patients.
authors.affiliation: Department of Anaesthesia, Aga Khan University Hospital, Karachi.
authors.forename: U
authors.initials: U
authors.lastname: Chohan
authors.forename: G
authors.initials: G
authors.lastname: Afshan
authors.forename: M Q
authors.initials: MQ
authors.lastname: Hoda
authors.forename: S
authors.initials: S
authors.lastname: Mahmud
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000775:Anesthesia, Spinal / Q000009:adverse effects / Q000379:methods*; D000779:Anesthetics, Local / Q000494:pharmacology*; D001340:Autonomic Nerve Block; D001794:Blood Pressure / Q000187:drug effects; D002045:Bupivacaine / Q000494:pharmacology*; D005260:Female; D006439:Hemodynamics / Q000187:drug effects*; D006801:Humans; D007022:Hypotension / Q000209:etiology; D008297:Male; D008875:Middle Aged; D009046:Motor Neurons / Q000187:drug effects; D009475:Neurons, Afferent / Q000187:drug effects; D012307:Risk Factors; D013997:Time Factors
chemical_list: D000779:Anesthetics, Local; D002045:Bupivacaine