Background: The aim of this study was to determine whether tissue coring occurs with 22-G hollow needle and 22-G caudal block needle during caudal injection in children, as well as evaluating the nature of the coring material if it did occur.
Methods: Seventy children were randomly allocated to two groups and caudal block was performed with either 22-G hollow (group I) or 22-G caudal block (group II) needle under general anesthesia. The needles and guides were washed with 0.5 ml of 70% ethanol in a sterile tube and were evaluated by a pathologist blinded to the type of needle used, for the type and number of cells.
Results: Nucleated cells, which have no mitotic activity, were present in 8.5% in each study group and bloody material was present in 8.5 and 2.8%, in group I and II, respectively. Non-nucleated epidermal cells were detected in 94.2 and 97.1% of the patients in group I and II, respectively. However, cells with mitotic activity from the stratum basale were not detected in any slides.
Conclusions: The incidence of transporting nucleated epidermal cells with no mitotic activity from stratum spinosum during puncture for caudal block is low and no differences exist between different types of needle used. However, it may also suggest that transporting nucleated cells with mitotic activity from the stratum basale may be possible during caudal puncture.
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