M.D. Anderson Cancer Center, Department of Infectious Diseases, 1515 Holcombe Blvd, Unit 402, Houston, TX 77030, USA
Received 19 December 2003; returned 26 January 2004; revised 9 March 2004; accepted 11 March 2004
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Abstract |
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Methods: We studied 56 patients with vancomycin-resistant enterococcal infections who were treated with quinupristin/dalfopristin 7.5 mg/kg every 8 h for a mean duration of 12 days (range 252 days). Liver function tests, including a test for alkaline phosphatase, were performed before, during and after the end of therapy. All patients were followed for 1 month after completion of therapy.
Results: Thirty-eight (68%) of the 56 patients responded. Myalgias/arthralgias were the leading adverse events occurring in 20 (36%) of the patients. Patients with myalgias/arthralgias had significantly higher levels of alkaline phosphatase (mean 318.7 IU/L) during the mid-term therapy cycle compared with patients without any joint or muscular pain (mean 216.3 IU/L, P = 0.05). In addition, 3/18 (16.6%) patients with myalgias/arthralgias had more than five-fold the normal levels of alkaline phosphatase, which did not occur in any of the other patients who did not develop myalgias/arthralgias (P = 0.04). All myalgias/arthralgias resolved after the discontinuation of quinupristin/dalfopristin. By univariate analysis, other factors associated with myalgias/arthralgias were relapse of haematological malignancy (P = 0.01), receiving tacrolimus within 1 month prior to treatment (P = 0.04) and receiving methotrexate during antimicrobial therapy (P = 0.05).
Conclusions: Myalgias/arthralgias occur frequently in cancer patients receiving quinupristin/dalfopristin and may be associated with biliary tract dysfunction, as measured by alkaline phosphatase or other factors that could lead to intra-hepatic cholestasis, such as relapse of haematological malignancy or treatment with tacrolimus or methotrexate.
Keywords: alkaline phosphatase, vancomycin-resistant enterococci, VRE
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Introduction |
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The objective of this current study was to determine, through post-hoc analysis of a previously published study from our institution,6 whether myalgias/arthralgias occurring in cancer patients who received quinupristin/dalfopristin were associated with biliary tract dysfunction, as measured by alkaline phosphatase levels.
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Materials and methods |
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Medications that were given within 1 month prior to the initiation of quinupristin/dalfopristin with minocycline, or during the antimicrobial therapy with this combination, were determined for all patients that were included. This comprised total parenteral nutrition and other interventions, such as total body irradiation.
Liver function tests, including tests of bilirubin, alkaline phosphatase, alanine aminotransferase and albumin, were performed on all patients in the week before therapy, mid-term during therapy and within 1 week after completion of therapy.
Categorical variables were compared through the 2 test or the Fisher exact test, and continuous variables were compared using the Students t-test or the MannWhitney test, as appropriate. All comparisons were based on two-tailed tests of significance at P
0.05. Analyses were performed using a statistical computing package (SPSS version 11.0 for Windows; SPSS Inc., Chicago, IL, USA).
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Results |
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As shown in Table 1, a post-hoc analysis was performed comparing patients who developed myalgias/arthralgias with those patients who did not develop these symptoms. The two groups were comparable in terms of gender, age, underlying disease, previous transplant within 1 year, APACHE II score, intubation status (Table 1) as well as site of infection and the presence of infectious complications (such as abscesses, hypotension, pneumonias and septic shockTable 1).
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However, as shown in Table 2, patients who developed myalgias/arthralgias were different from those patients who did not develop these symptoms in that they had higher alkaline phosphatase levels mid-therapy (P = 0.05), although not at pre-treatment or post-treatment. In addition, those patients who had more than five times normal alkaline phosphatase levels were more likely to develop myalgias/arthralgias (P = 0.04). However, levels of bilirubin, transaminases, total protein and albumin were comparable between the two groups at pre-treatment, mid-treatment and post-treatment intervals. In addition, those patients who developed myalgias/arthralgias were more likely to have a relapsing haematological malignancy (P = 0.01), to have received tacrolimus during the month prior to treatment (P = 0.04) and to have received methotrexate during antimicrobial therapy with quinupristin/dalfopristin (P = 0.05). Myalgias/arthralgias led to the termination of quinupristin/dalfopristin in two patients after 5 and 9 days of therapy, respectively.
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Discussion |
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A subject of controversy has been whether myalgias/arthralgiasas the leading adverse events associated with quinupristin/dalfopristin treatmentare associated with hepatic dysfunction. Olsen et al.4 showed no significant relationship between increases in hepatic transaminases or total bilirubin levels and myalgias/arthralgias associated with quinupristin/dalfopristin treatment. Nevertheless, more recently, Carver et al.,5 through multivariate analysis, demonstrated that myalgias/arthralgias secondary to quinupristin/dalfopristin treatment were associated with chronic liver disease, prior liver transplantation, elevated bilirubin level at baseline and the use of hepatotoxic drugs such as ciclosporin. In a multivariate analysis of a large patient population consisting of 1099 patients who were treated with quinupristin/dalfopristin, hepatic disease (particularly gallbladder disease) was found to be an independent risk factor associated with myalgias/arthralgias.7
Data from this current study reconcile the findings from the previous literature and point to the fact that myalgias/arthralgias could be related to biliary dysfunction rather than any hepatic disease. According to our data, there was no correlation between increased bilirubin or transaminase levels and myalgias/arthralgias. However, there was a significant association between increased alkaline phosphatase levels at mid-therapy and the occurrence of myalgias/arthralgias. Alkaline phosphatase is a crude measure of biliary dysfunction. Quinupristin/dalfopristin is predominantly (>80%) excreted through the biliary tract.8 Biliary tract dysfunction, as measured by increased alkaline phosphatase levels, could have led to decreased excretion of this drug, predisposing to a higher frequency of myalgias/arthralgias, which started mostly on the third day of therapy. Hence, on the one hand, we have demonstrated, like Olsen et al.,4 that there is no relationship between increased transaminases or total bilirubin levels and myalgias/arthralgias. On the other hand, our data are consistent with the findings of Talbot & Zhu,7 whereby patients with hepatobiliary disease (particularly those patients with gallbladder disease, implying a biliary dysfunction) were more prone to develop myalgias/arthralgias.
Other variables, such as methotrexate and tacrolimus treatment or relapse of leukaemia, were also significantly associated with the occurrence of myalgias/arthralgias. All of these factors are known to be associated with hepatobiliary dysfunction. Methotrexate and tacrolimus are known to cause hepatotoxicity and cholestatic jaundice.9,10 Therefore, cancer patients who received methotrexate and tacrolimus could have developed biliary dysfunction and intra-hepatic cholestasis, and hence, they may have become predisposed to develop myalgias/arthralgias upon receiving quinupristin/dalfopristin. Similarly, patients with a relapse of leukaemia or lymphoma are at higher risk of developing hepatic infiltration with a tumour leading to intra-hepatic cholestasis, which could have predisposed them to myalgias/arthralgias.
All of the patients in this current study who survived the infection had the myalgias and arthralgias resolved upon the discontinuation of quinupristin/dalfopristin. Winston et al.3 showed that myalgias/arthralgias were dose-related and occurred only in patients who received 7.5 mg/kg every 8 h, but not in most patients who received 5 mg/kg every 8 h. However, there are several limitations in this current study that keep us from suggesting dose adjustment or definitively concluding that biliary dysfunction predisposes to myalgias/arthralgias. The first is the small number of patients. Secondly, this was not a prospective, randomized study that involved dose adjustment. Thirdly, the difference in alkaline phosphatase levels between patients who developed myalgias/arthralgias and those who did not, occurred at the point of mid-term therapy with quinupristin/dalfopristin. This could be because this antibiotic may have induced changes in alkaline phosphatase in some high-risk patients, which could have contributed to myalgias/arthralgias. Finally, as a test, alkaline phosphatase is not specific for biliary dysfunction and could originate from bone.
Myalgias/arthralgias remain a major limitation to the use of quinupristin/dalfopristin; however, this drug has been shown to be effective in the treatment of resistant Gram-positive infections. Data from our study show that myalgias/arthralgias in patients receiving quinupristin/dalfopristin are associated with increased alkaline phosphatase (which could be suggestive of biliary dysfunction) or other factors (such as tacrolimus, methotrexate or leukaemia/lymphoma relapse) that would predispose to intra-hepatic cholestasis.
In patients with biliary dysfunction receiving quinupristin/dalfopristin, the impact of dose adjustment on the prevention of myalgias/arthralgias should be studied in a prospective, randomized manner.
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Acknowledgements |
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Footnotes |
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References |
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2
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3 . Winston, D. J., Emmanouilides, C., Kroeber, A. et al. (2000). Quinupristin/dalfopristin therapy for infections due to vancomycin-resistant Enterococcus faecium. Clinical Infectious Diseases 30, 7907.[CrossRef][ISI][Medline]
4 . Olsen, K. M., Rebuck, J. A. & Rupp, M. E. (2001). Arthralgias and myalgias related to quinupristin-dalfopristin administration. Clinical Infectious Diseases 32, e83e86.[CrossRef][ISI][Medline]
5 . Carver, P. L., Whang, E., VandenBussche, H. L. et al. (2003). Risk factors for arthralgias or myalgias associated with quinupristin-dalfopristin therapy. Pharmacotherapy 23, 15964.[ISI][Medline]
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7 . Talbot, G. H. & Zhu, G. R. (1998). Characterization of arthralgias/myalgias associated with quinupristin/dalfopristin (Synercid). Clinical Infectious Diseases 27, 965.
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10 . Anonymous. (2003). Methotrexate: adverse reactions. In Physicians Desk Reference, 5th edn, p. 3418. Thomson PDR, Montvale, NJ, USA.
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