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Effects of adenosine triphosphate (ATP) on somatosensory evoked potentials in humans anesthetized with isoflurane and nitrous oxide
Author(s) -
ANDOH T.,
OHTSUKA T.,
OKAZAKI K.,
OKUTSU Y.,
OKUMURA F.
Publication year - 1993
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1993.tb03770.x
Subject(s) - nitrous oxide , medicine , isoflurane , adenosine triphosphate , anesthesia , halothane , adenosine , somatosensory evoked potential
In order to examine the usefulness of adenosine triphosphate (ATP) as an adjuvant to anesthesia for surgery requiring intraoperative somatosensory evoked potential (SSEP) monitoring, we have studied the effects of ATP on SSEPs in patients anesthetized with isoflurane and nitrous oxide (N 2 O). A control recording of SSEP was performed while anesthesia was maintained with 0.5% end‐tidal concentration of isoflurane in 60% N 2 O. The recordings were repeated after an ATP infusion had been added to this basal anesthesia at the rates of 100 μgkg bw ‐1 min ‐1 and 200 μg kg bw ‐1 min ‐1 . SSEP was also studied when end‐tidal isoflurane concentration was increased to 1.5% after cessation of ATP infusion. An infusion of ATP combined with 0.5% isoflurane and 60% N 2 O effectively inhibited an increase in blood pressure during surgery. The amplitude of the cortical component of SSEP was lowered by 1.5% isoflurane, which also increased both cortical and spinal latencies as well as central conduction time (CCT). In contrast ATP infusions at both rates induced no significant changes in latencies, amplitude and CCT. The results indicate that ATP infusion combined with 0.5% isoflurane in 60% N 2 O can be a useful anesthetic technique for intraoperative SSEP monitoring because adequate anesthetic depth can be maintained by a low concentration of anesthetics without further suppression of SSEPs.