Appropriate Duration of Intravenous Treatment of Candidemia and Timing of Step Down to Oral Therapy in Non-neutropenic Patients
Received: , 2018
Accepted: , 2018
Mediterr J Hematol Infect Dis 2018, 10(1): e2018028 DOI 10.4084/MJHID.2018.028
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this review, we have analyzed the available literature pertaining to
the total duration of intravenous (IV) therapy and the appropriate
timing of step down to oral therapy in the management of candidemia.
Overview of the guidelines and literature seem to indicate that a
minimum of 14 days of antifungal therapy is required in the treatment
of candidemia without deeply seated infection. However, this was never
based on evidence. Furthermore, step down to oral therapy seems to be
dependent on the clinical stability criteria of the patient with
candidemia after 4 to 7 days of IV therapy. Further studies are
required to evaluate the appropriate total duration of IV therapy,
appropriate timing of step down to oral therapy and to validate the
clinical criteria that would allow the switch to happen.
The most recent guidelines for the management of Candidemia without deeply seated complications (published by the Infectious Diseases Society of America (IDSA) in 2016) recommended a minimum of 14 days of antifungal therapy after documented blood culture clearance in a clinically stable state. In the case of neutropenia, the guidelines also entail recovery of the white cell count. However, these recommendations are based on limited clinical evidence grounded on the results of a number of trials in which this practice has been implied and routinely applied both in the non-neutropenic and less often the neutropenic population.[6-9]
In a milestone study by Rex et al. published in the New England Journal of Medicine in 1994 showing the equivalence of fluconazole to amphotericin B in the treatment of candidemia, the duration of therapy in both arms was mandated to be 2 weeks after the last negative blood culture. Unfortunately, this practice has been carried through routinely as norm through the literature and guidelines over the last three decades in the absence of other studies to compare the impact of total duration of therapy and appropriate time to step down to oral therapy.
Duration of Therapy
Hence, it is necessary to evaluate the available data on the total duration of therapy of uncomplicated candidemia given the importance of the subject matter.
One would argue that a long duration of therapy is useful for prevention or unintentional treatment of undiscovered foci of infection given the fact that up to 16% of candidemic patients have some exhibition of ocular involvement, with devastating consequences in inappropriately treated patients. In a study by Blennow et al., two to three weeks of antifungal treatment was found to be adequate to treat undetected ocular infections in the setting of candidemia without signs of metastatic infection at onset. In this cohort, 21 patients received <=14 days of therapy. Among them, only one patient developed proven endophthalmitis after having received only 2 days (total) of therapy. However, we cannot draw conclusions from this study on the effect of duration of therapy since the patients could be treated longer as a consequence to having a possible or probable ocular candidiasis. In addition, the authors did not distinguish the duration of IV versus oral therapy.
Step Down to Oral Therapy
|Figure 1. Proposed timing of step down to oral therapy in the medical literature|
In the actual practice, physicians are applying the step down therapy as per their clinical judgment. Setting clinical stability is not uniformly defined. Some studies relied on the hemodynamic status and microbiologic eradication, while others relied on the improvement in clinical signs and symptoms (defervescence for 24 hours) along with microbiological eradication.[14,15]
A trial conducted in several centers in Latin America, patients were eligible for step down after at least 5 days of anidulafungin if they had “stable blood pressure “ and at least two negative blood cultures. Only 14 out of 44 qualified for step down to voriconazole with a median duration of IV therapy of six days. They were all found to have lower APACHE II score and lower incidence of solid tumors compared with others making them less sick. Global response and overall mortality were significantly lower in the step down group. Even though the number of enrolled patients is small, this study showed the feasibility of the step down therapy but it did not give us an idea on the efficacy of stepping down the therapy to oral formulation in high risk patients especially that the two approved/used agents (fluconazole and voriconazole) show >90% oral bioavailability.
An open-label non-comparative trial evaluated global response rates, defined by clinical improvement and microbiological eradication, of patients with candidemia who were treated with anidulafungin followed by oral fluconazole (if baseline cultures revealed C. albicans or C. parapsilosis) or voriconazole (all other species) after a minimum of 5 days of anidulafungin provided that the patients were clinically stable. The step down criteria consisted of 24 hours off fever, hemodynamic stability and documentation of sterile blood cultures and resolved neutropenia. A total of 150 patients underwent a step down to oral therapy, 56% of them qualified for the switch to oral therapy within 6 days with a median of 5 days [range, 1-6]. On the other hand, 44% did not meet the criteria within the first 6 days of therapy and the median duration of their IV therapy was 10 days [range, 7-27]. The overall response in the group of patients who underwent early step down versus the modified intention to treat (MITT) population did not differ. Again it was noted that the patients who were switched to oral therapy before 7 days from onset had lower APACHE scores. This study shows that early step down to oral therapy within 6 days is dependent on certain clinical stability criteria (Table 1).
|Table 1. Proposed clinical criteria to determine the eligibility to step down to oral antifungal therapy.|
Another study compared voriconazole to amphotericin B therapy whereby the protocol allowed switch from IV voriconazole to oral voriconazole and from IV amphotericin to oral fluconazole. The median duration of amphotericin B was 4 days. Even though the authors did not mention the median duration of IV voriconazole therapy and the percentage of patients switched to the oral formulation, there was no significant difference in overall response between the two groups.
Another concern with the current proposed step down strategies was raised by Glockner et.al which is the vague definition of the timing of documented negative blood culture. This timing may vary depending on how often the blood cultures are taken and the fact that they are known to have slow turnaround times with median time to positivity of 2–3 days reaching 7 days in some situations.[18,19] Glockner at al., therefore, suggest to consider the timing of collection of the first negative blood culture as a starting point to initiate step down strategies.
What is notable in many of the conducted studies is that microbiologic eradication ranged between 2 and 5 days regardless of the antimicrobial agent and the route of administration.[16,17,20] This finding could be used to set an appropriate time to consider stepping down or de-escalating the treatment safely.
No studies showed superiority of any agent, however, both the ESCMID and the IDSA guidelines suggest the initiation of echinocandins with a later step down to an appropriate agent based on the susceptibility pattern and the patient’s clinical status.[5,13] The reason that these agents have become the common practice is their fungicidal activity whereby susceptibility studies have shown low MIC for Candida species including C. glabrata and C. krusei.[21,22] Furthermore, echinocandins demonstrated a survival advantage in non-neutropenic patients. In addition, they are only available in intravascular formulation which puts the patients in situations where they have to stay as inpatients to receive their treatment or face the hurdles of home IV therapies. In addition, they reportedly have minimal adverse effects with limited drug interactions.
However, recent case series have described treatment failure associated with growing resistance among strains comprising C. glabrata and C. tropicalis.[25,26]
Hence, it is important to establish the feasibility of a step down therapy from echinocandins especially to address the aforementioned increasing risk of resistance. On the other hand, stepping down from IV therapy when feasible might also positively affect the healthcare cost in this subset of patients while maintaining the successful clinical outcome as shown in previous des-escalation cost effective analysis from studies from the UK and China.[27,28]
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