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Anestesia Analgesia Reanimación

versión On-line ISSN 1688-1273


GONZALEZ VASQUEZ, Mariana; CALDERON, Nicolás; METZ, Guillermo  y  SZWARC, Mariano. Anestesia subaracnoidea con ropivacaína hiperbárica versus bupivacaína hiperbárica asociadas a fentanilo para operación cesárea de urgencia.: Ensayo clínico controlado con asignación aleatoria. Anest Analg Reanim [online]. 2013, vol.26, n.1, pp.4-4. ISSN 1688-1273.

SUMMARY  Introduction: we compared hyperbaric ropivacaine with hyperbaric bupivacaine in subarachnoid anesthesia, both associated to fentanyl, in patients subject to urgent cesarean section. The doses used were lower than those studied so far but more adequate than those currently recommended. Objectives: we compared the two types of local anesthesia and analyzed their effect on motor block and on hemodynamic performance during the surgery after the subarachnoid administration of the solutions under study; at the same time we described the frequency of adverse effects associated to this procedure. Method: the study performed consisted of a multicenter randomized controlled clinical trial, in term pregnant patients (37 to 41 weeks pregnant), ASA I or II, between 18 and 40 years of age, who received intrathecal hyperbaric bupivacaine 10 mg plus 20 mcg fentanyl (Group 1) or intrathecal hyperbaric ropivacaine 15 mg plus 20 mcg fentanyl (Group 2). All drugs used in this protocol are approved by the A.N.M.A.T (National Administration of Drugs, Foods and Technology). Motor block, hemodynamics and adverse effects were evaluated. Results: there were no significant differences in terms of age, size, weight gestational age and surgical time. Ropivacaine -administered in equipotent doses in relation with bupivacaine- showed a lower potential in the prolongation of motor block. The bupivacaine group evidenced a higher incidence of hypotension - with a significant p= 0,02- compared to ropivacaine. These findings are confirmed by the differences in the administration of ephedrine required for each group: more than 25% higher for the bupivacaine group. Other adverse effects were not statistically significant. Conclusion: both ropivacaine and bupivacaine provide safety and quality in patients undergoing urgent cesarean section. However, ropivacaine proves to be more efficient due to lower incidence of hemodynamic complications and a rapid recovery from motor block.


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