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  • Title: Effects of stylet-in versus stylet-out collection of cerebrospinal fluid from the cisterna magna on contamination of samples, sample quality, and collection time.
    Author: Shamir SK, Hagen CRM, Foley PM, Gilroy CV, Yu J, Amsellem PM.
    Journal: Am J Vet Res; 2019 Aug; 80(8):787-791. PubMed ID: 31339768.
    Abstract:
    OBJECTIVE: To evaluate safety of stylet-in and stylet-out techniques for collection of CSF from the cisterna magna and to assess whether there were differences between techniques with regard to contamination of samples, sample quality, and efficiency of collection. ANIMALS: 10 adult purpose-bred research Beagles. PROCEDURES: A prospective crossover study was conducted. Preanesthetic physical and neurologic examinations and hematologic analyses were performed. Dogs were anesthetized, and collection of CSF samples from the cisterna magna by use of a stylet-in or stylet-out technique was performed. Two weeks later, samples were collected with the other sample collection technique. Samples of CSF were processed within 1 hour after collection. RESULTS: Cellular debris was detected in higher numbers in stylet-in samples, although this did not affect sample quality. The stylet-out technique was performed more rapidly. No adverse effects were detected for either technique. CONCLUSIONS AND CLINICAL RELEVANCE: Both techniques could be safely performed in healthy anesthetized dogs. The stylet-out technique was performed more rapidly and yielded a sample with less cellular debris. Both techniques can be used in clinical practice to yield CSF samples with good diagnostic quality.
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