Affordable Access

Intrathecal anesthesia with ketamine

Authors
Publication Date
Keywords
  • Rc Internal Medicine
Disciplines
  • Medicine

Abstract

Background and Objectives: Intrathecal anesthesia is the method of choice for transurethral prostate resection in the United Kingdom, despite its associated hypotension. Intrathecal ketamine with epinephrine has been used for lower limb surgery with minimal cardiovascular disturbance. Because cardiovascular stability might be advantageous in this group of elderly patients, we undertook this study to determine if intrathecal ketamine was a suitable intrathecal anesthetic agent for transurethral prostate surgery. Because of the high incidence of side effects and inadequate analgesia, the study was terminated after only ten patients had been recruited. Methods: Ten ASA I to III males were studied. Spinal anesthesia was performed with a 25-gauge Whitacre needle at the L2–L3 or L3–L4 space. The dose of ketamine was determined by a sequential allocation technique after initial empirical doses of 0.5 and 0.75 mg/kg. Sensory and motor block were monitored using pinprick and modified Bromage score, respectively. If spinal anesthesia was inadequate at any time, a general anesthetic was administered. Results: At doses higher than 0.7 mg/kg, intrathecal ketamine produced both motor and sensory block. The onset of motor block was within 2–3 minutes, peaked in 5–10 minutes, and lasted 30–60 minutes. Sensory block took 5–20 minutes to reach its maximal height. Maximum sensory block height varied from L1 to T7. Despite adequate block to pinprick, half the patients sensed the diathermy and were given a general anesthetic. The incidence of severe psychotomimetic side effects was 30%. Conclusions: Intrathecal ketamine at doses of 0.7–0.95 mg/kg produces sensory and motor block. The frequency of psychomimetic disturbance, inadequate analgesia, and short duration of action preclude its use as a sole anesthetic agent.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

Intrathecal anesthesia with ketamine

on Regional Anesthesia and Pain M... Jan 01, 1998

Intrathecal anesthesia with ketamine.

on Regional Anesthesia and Pain M... 1998

Ketamine anesthesia.

on South Dakota journal of medici... October 1971
More articles like this..