Minerva anestesiologica
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Drug development in anaesthesia poses specific challenges. Describing the development of remifentanil highlights some of these. A new drug in anaesthesia must achieve its clinical goals in all patients and significant levels of toxicity are unacceptable. ⋯ The insertion of an alkyl ester group into this 4-anilidopiperidine molecule has resulted in a compound which, whilst retaining the desired mu-opioid receptor pharmacology, is susceptible to metabolism by non-specific esterases in the blood and tissues. The rapid onset and offset of action means that the anaesthetist can deliver high doses of opioid resulting in stable anaesthesia and the lack of accumulation ensures that even after prolonged infusion remifentanil does not compromise recovery. This ability to control the anaesthetic process has relevance in both short and long procedures and the unique characteristics of remifentanil may also in the future prove to have utility in the intensive care setting.
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Minerva anestesiologica · May 2000
ReviewMeasurement of pressure-volume curves in patients on mechanical ventilation. Methods and significance.
In critically ill patients measurements of pressure volume curves has been suggested as a method for assessing the severity of lung injury and for monitoring the evolution of the lung disease; it can also guide the ventilatory adjustments to optimize the mechanical ventilation. The static pressure-volume curves are impaired in acute respiratory distress syndrome (ARDS). ⋯ The combined application of positive end expiratory pressure (PEEP) to the level of alveolar recruitment and low tidal volume (< 6 ml/kg) ameliorates the lung function and decrease mortality in ARDS patients. Routine monitoring with continuous technique is easy and develops good therapeutic practice.
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The selection of opioid drugs for anesthesia is often based on empirical judgment such as the selection of opioids with rapid elimination half-life for short surgical procedures (e.g. alfentanil), while opioids with longer elimination half-life (e.g. fentanyl, sufentanil) are used for longer procedures. A better insight in the pharmacokinetic and pharmacodynamic differences between opioids allows a more rational selection of the drug and its dosing scheme, and will contribute to rapid recovery after anesthesia. As opioids are adjuncts to other anesthetic drugs, drug interaction principles should be considered when titrating the opioid administration.
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Minerva anestesiologica · May 2000
ReviewTime to reconsider the pre-oxygenation during induction of anaesthesia.
Atelectasis is a frequent finding in paralysed and mechanically ventilated patients. Atelectasis, causing shunt, impairs oxygenation and could contribute to postoperative pulmonary complications. Pre-oxygenation used during anaesthesia induction causes atelectasis. A lowering of oxygen fraction from 100% to 80% does not shorten the safety time of apnoea period, particularly useful for a difficult intubation, but it reduces drastically the atelectasis incidence.
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Due to pharmacokinetic and pharmacodynamic reasons, the elderly are at particular risk of incurring unwanted side effects of drugs commonly used in anaesthesia. The bispectral index (BIS) is an EEG-derived value that measures the sedative component of the anaesthetic state. The BIS could be useful in guiding titration of anaesthetic drugs in the elderly. ⋯ The BIS is a useful guidance for titration of anaesthetic drugs in the elderly. The presence of senile dementia may be a confounding factor in the interpretation of the BIS values during anaesthesia.