Abstract

selected cases; hence, comparisons based on these parameters would not be meaningful. For instance, if a surgeon placed a PNt in patients whose bleeding during the case was high, then their hemoglobin level would be lower than patients in the tubeless group. So, we cannot make a decision to perform tubeless PCNL in a patient in light of these results. We suggest that a randomized, prospective, singlecenter study should be done to determine the predictive factors for placement of a PNt. Finally, the authors need to state whether they placed a ureteral catheter (totally tubeless PCNL). If so, they need to provide the data regarding its removal.

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