title: Low hypobaric bupivacaine doses for unilateral spinal anesthesia.
abstract: OBJECTIVE
  The possibility to achieve unilateral spinal anesthesia with 0.15% bupivacaine was studied with the purpose of minimizing hemodynamic changes, limiting the cephalad dispersion of the anesthetic and promoting a faster recovery.
  
  
  METHODS
  Twenty ASA I - II patients undergoing orthopedic surgeries were given spinal 0.15% hypobaric bupivacaine through a 27G Quincke needle. Dural puncture was performed with patients in the lateral position, with the limb to be operated upwards, and 3.3 ml (5 mg) hypobaric bupivacaine were injected at the rate of 1 ml.15 s(-). Sensory and motor block (pinprick and 0 to 3 scale) were compared between operated and contralateral sides.
  
  
  RESULTS
  Motor and sensory block in operated and contralateral sides were significantly different in all evaluated times. Unilateral spinal anesthesia was achieved in 75% of patients. All patients remained hemodynamically stable, and no one developed post-dural puncture headache.
  
  
  CONCLUSIONS
  Hypobaric bupivacaine (5 mg) is able to provide a predominant unilateral block with the patient being kept twenty minutes in the lateral position. Major unilateral spinal anesthesia advantage is hemodynamic stability.
authors.affiliation: Casa de Saúde Santa Maria, Clínica São Bernardo e Hospital do IASERJ, Rio de Janeiro, RJ. imbelloni@openlink.com.br
authors.forename: Luiz Eduardo
authors.initials: LE
authors.lastname: Imbelloni
authors.forename: Lúcia
authors.initials: L
authors.lastname: Beato
authors.forename: M A
authors.initials: MA
authors.lastname: Gouveia