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Pulse IV methylprednisolone therapy is the intermittent administration of supraphysiological quantities of the drug to enhance its therapeutic effects while reducing its toxic effects.1 A typical pulse regimen ranges from 500 to 1000 mg IV daily for 2–4 consecutive days.1,2 It has been suggested that methylprednisolone may cause an acute increase in serum creatinine (SCr), which can be misinterpreted as a clinical indication of worsening renal function.3 A proposed mechanism for this effect is catabolic degeneration of protein and loss of muscle tissue induced by steroid therapy.3 However, the relation between pulse therapy and acute change in SCr after drug administration is not well defined. Sakemi and others4 conducted a retrospective analysis of 56 patients with renal or collagen disease receiving 3 consecutive pulses of methylprednisolone 1000 mg IV daily. They found that the mean SCr increased significantly 1 day after the last dose and hypothesized that the observed effect depended on clinical status.4They speculated that the increase in SCr could have been due to baseline nephrosis and renal impairment, as opposed to the drug therapy. Liu and others5 conducted a prospective study involving 49 patients with collagen vascular disease who received methylprednisolone 1000 mg IV daily for 3 consecutive days. In that study, there was no clinically significant change in SCr 1 day after the last dose.5 Other literature examining the relation between consecutive pulse doses of steroid and acute change in SCr after drug administration is limited, especially for patients without baseline renal impairment. Characterizing the acute effects of pulse dosing of methylprednisolone on SCr has important benefits. It will assist clinicians in determining whether patients who experience an increase in SCr have renal impairment, as opposed to a transient increase caused by the medication, thus avoiding unnecessary diagnostic or corrective interventions. A retrospective chart review was conducted for patients receiving pulse methylprednisolone for conditions in which renal impairment did not exist or was not anticipated from progression of disease at the time of treatment. All patients at 2 hospitals in Vancouver (St Paul’s Hospital, a 500-bed tertiary care facility, and Mount Saint Joseph Hospital, a 100-bed community hospital) who received methylprednisolone 500–1000 mg IV daily for 2–4 consecutive days between July 1, 2009, and July 1, 2013, were considered for inclusion. The exclusion criteria were established renal impairment (SCr > 110 μmol/L or estimated glomerular filtration rate < 50 mL/min) before the first dose of methylprednisolone; shock requiring administration of vasoactive inotropes6; dehydration (negative fluid balance > 3 L between the preand post-methylprednisolone SCr measurements); receipt of dialysis or renal replacement therapy; or nephrotoxic medication (specifically, systemic aminoglycosides, IV acyclovir, or amphotericin B).7 Measurements of SCr concentration before and after methylprednisolone therapy were collected from the hospital patient care information system. For each patient, the pretherapy SCr value was a value recorded on the day of the first dose of methylprednisolone or, if unavailable for that day, the immediately preceding day. The post-therapy SCr value was a value recorded on the day after the last dose (e.g., day 4 if the patient had a 3-day regimen) or, if unavailable for that day, the next day. SCr concentrations for other days were not collected. The SCr measurements were summarized as means ± standard deviations (SD). A 2-tailed paired t test, for data with a normal distribution, was used to compare the means (using Microsoft Excel software; Microsoft, Redmond, Washington); p values less than 0.05 were considered statistically significant. The study was approved by the University Table 1. Characteristics of Study Participants

Does Pulse Dosing of Methylprednisolone Have an Acute Effect on Serum Creatinine Concentrations?