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  • Title: Epidural test dose in obstetric patients: should we still use it?
    Author: Massoth C, Wenk M.
    Journal: Curr Opin Anaesthesiol; 2019 Jun; 32(3):263-267. PubMed ID: 30985339.
    Abstract:
    PURPOSE OF REVIEW: As the application of a test dose after epidural catheter insertion in obstetrics has recurrently been associated with serious adverse events affecting both maternal and foetal outcomes, the question whether to test or not remains a controversial issue. RECENT FINDINGS: Present guidelines do not provide clear recommendations in this regard and several recent surveys indicate a heterogeneity in clinical routine. SUMMARY: Physiological alterations during pregnancy and labour restrict the use and also the validity of traditional test agents. Epinephrine is not appropriate to detect a vascular insertion in labour and the application of a local anaesthetic test dose may lead to dose-dependent fatal consequences should the catheter be intrathecal, due to an increased sensitivity in parturients. Given the current practice of opioid-amended-low-concentration epidurals, the waiving of a test dose results at worst in a failed epidural, a stark contrast to the potentially severe to fatal complications of a 'traditional' test dose. Hence, an originally preventive measure providing potentially more harm than the consequences of the situation aimed to prevent, should not be recommended. A simple fractionated administration of the initial analgesic dose seems reasonable though.
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