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Titolo:
Are changes in the evoked electromyogram during anaesthesia without neuromuscular blocking agents caused by failure of supramaximal nerve stimulation?
Autore:
Polhill, SL; Clewlow, F; Smith, DC;
Indirizzi:
Southamptonts,n Hosp, Shackleton Dept Anaethesia, Southampton SO16 6YD, Han Southampton Gen Hosp Southampton Hants England SO16 6YD ton SO16 6YD, Han Southampton Gen Hosp, Dept Med Phys & Bioengn, Southampton SO16 6YD, Hants, Southampton Gen Hosp Southampton Hants England SO16 6YD SO16 6YD, Hants,
Titolo Testata:
BRITISH JOURNAL OF ANAESTHESIA
fascicolo: 6, volume: 81, anno: 1998,
pagine: 902 - 904
SICI:
0007-0912(199812)81:6<902:ACITEE>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRODE IMPEDANCE; MYASTHENIA-GRAVIS; TEMPERATURE; ANESTHESIA; RESPONSES; HALOTHANE;
Keywords:
measurement techniques, electromyography; measurement techniques, neuromuscular block; neuromuscular block, measurement of response;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Smith, DC SouthamptonO16n Hosp, Shackleton Dept Anaethesia, Tremona Rd, Southampton S Southampton Gen Hosp Tremona Rd Southampton Hants England SO16 6YD
Citazione:
S.L. Polhill et al., "Are changes in the evoked electromyogram during anaesthesia without neuromuscular blocking agents caused by failure of supramaximal nerve stimulation?", BR J ANAEST, 81(6), 1998, pp. 902-904

Abstract

The evoked electromyogram often decreases during anaesthesia in the absence of neuromuscular block. We have measured the electromyogram of the first dorsal interosseous muscle evoked by train-of-four stimulation of the ulnarnerve in 63 patients undergoing anaesthesia for minor surgery. We used Medicotest P-OO-S electrodes, a Datex Relaxograph and a current sink in the stimulating leads in parallel with the current path through the patient. The current sink was used to shunt some of the maximum available output currentfrom the Relaxograph while maintaining the supramaximal stimulus current passing through the patient. After 30 min of anaesthesia, when the muscle response to train-of-four was stable, the ulnar nerve stimulus current was increased by reducing the proportion shunted through the current sink. The electromyographic response did not change during the study in 13 patients. Inthe remaining 50 patients, the response decreased to 78.4% (SD 27.1%, range 7.5-95.0%) of baseline values over the first 20 min of anaesthesia. In 22of these patients, the electromyographic response increased from 71.4 (SD 22.6)% to 92.3 (9.5)% of baseline responses when the stimulus current was increased by 12.3 (2.4) mA, while in the remaining 28 patients the response decreased to 83.7 (10.6)% and did not increase with increasing stimulus current. These results suggest that loss of supramaximal stimulation is partlyresponsible for the observed changes in the evoked electromyogram during anaesthesia.

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Documento generato il 30/09/20 alle ore 08:19:50