Canadian journal of anaesthesia = Journal canadien d'anesthésie
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Perioperative myocardial ischaemia is common in patients who have or are at risk of coronary artery disease, occurring frequently in the pre-, intra- and postoperative periods. The majority of perioperative ischaemic episodes are silent, being unaccompanied by any symptoms of angina. ⋯ Maintenance of haemodynamic stability is important to reduce the incidence of myocardial ischemia, but ischaemia may occur in the absence of adverse haemodynamic changes. Although our efforts have largely been devoted to the prevention and treatment of intraoperative ischaemia, it is hoped that similar efforts outside the operating room in the postoperative period will further improve patient care and outcome.
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Comparative Study
Tongue oximetry in children with extensive thermal injury: comparison with peripheral oximetry.
We undertook a prospective study of standard peripheral pulse oximetry versus a modified pulse oximeter probe applied to the tongue in order to determine the efficacy of this alternative monitoring site in children with thermal injuries. Ten patients with a mean age (+/- SD) of 7.5 +/- 4.5 yr were studied on 15 occasions. The mean weight (+/- SD) was 31.4 +/- 13.7 kg and percent surface area burn (+/- SD) was 56 +/- 21%. ⋯ The tongue oximeter provided 563 min more monitoring time than the peripheral sites. The tongue oximeter also functioned in children with peripheral vasoconstriction when the peripheral sensor failed and was less susceptible to electrocautery interference. The tongue oximeter is a reasonable adjunct but not a substitute for peripheral oximetry since its application is limited to paralyzed, intubated patients.
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Unanticipated difficulties continue to occur in airway management. While newer systems of evaluation show some promise, the problem of poor predictive value limits their usefulness. ⋯ The anaesthetist should have a clear "fall back" plan of which of these techniques to use in emergency or urgent situations. Published algorithms may aid in the selection of appropriate techniques, but the anaesthetist must also develop dexterity with the particular technique chosen.
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Most children with congenital heart disease can be man-aged safely if the pathophysiology of their lesion and the anaesthetic implications are understood. However, recent reviews of anaesthetic morbidity reveal a high incidence of anaesthetic-related adverse events in children with congenital heart disease.