[FEVER. DIAGNOSIS AND THERAPY OF FEVER OF UNKNOWN ORIGIN].
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Fever should be treated according to the individual situation. Securing a sufficient fluid intake is the most important primary measure. The decrease of body temperature by physical means is efficient only in combination with drug therapy and presumes the control of blood circulation. Aminophenazon is the most efficient drug to lower fever. Metamizol should be prefered in children at risk for convulsive disorders. The combination of aminophenazon with phenothiazines can be recommended , prothazine is the drug of first choice in suitable cases a caudal treatment of fever with antiphlogistic drugs as diclophenacsodium (Voltaren) is indicated.
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Fever is an adaptive physiological process. In reaction to specific proteins (pyrogens) distributed by the blood the reference temperature increases, thus the organism has to produce heat. In intensive care units approximately 50 percent of fever episodes are caused by hospital acquired infections, while other episodes result from non-infectious diseases or their aetiology remain undetected. A special kind of fever is the hyperthermia following malfunctioning hypothalamic regulation after central nervous diseases or injuries. In patients with severe head injuries any increase of temperature has to be prevented as hyperthermia is associated with more adverse outcomes. If the hyperthermia can be attributed to other aetiological factors, a decrease of temperature is not desirable provided that the consequences of fever do not jeopardize the patient for further health risks. As a basis of therapy, the aetiology of fever episodes should be diagnosed taking recent scientific knowledge and guidelines into consideration. The most reliable temperature values are measured by using invasive sensors, particularly in pulmonary arterial catheters or bladder catheters. Alternatively usual thermometers can be applied, due to unreliable results excepting in the axilla.
We studied episodes of fever and neutropenia in children and adolescents without documented infections to determine the risk of recurrent fever after early discontinuation of empiric antibiotic therapy; 213 episodes occurred in 106 patients. All patients received empiric antibiotic therapy after cultures were obtained. Antibiotic therapy was discontinued if no infection was found, culture results were negative for 48 hours, and the patient was afebrile for 24 hours. In 83 episodes without documented infection, antibiotic therapy was stopped with absolute neutrophil counts < 0.5 x 10(9)/L (< 500/mm3); 50 episodes occurred in patients with solid tumors, leukemia in remission, and other hematologic conditions (group 1), and 33 in patients with active leukemia (group 2). Fever recurred before neutropenia resolved in 6% of group 1 and 45% of group 2 episodes; five patients in group 2 had documented infection. Recurrent fever risk correlated with absolute neutrophil count and monocyte count at the time antibiotic therapy was stopped, in both groups, as did increasing absolute neutrophil count and increasing leukocyte count in group 2. We conclude that discontinuing antibiotic therapy is safe in febrile episodes without documented infections before neutropenia resolves in patients with high potential for bone marrow recovery. The risk of recurrent fever and infection is significant for patients with neutropenia and poor marrow recovery potential.
Combinations of beta-lactams plus aminoglycosides have been standard therapy for suspected infections in granulocytopenic cancer patients, especially those with profound long-lasting granulocytopenia. With the advent of new broad-spectrum bactericidal antibiotics such as extended-spectrum cephalosporins or carbapenems, the need to combine beta-lactams with aminoglycosides became more controversial. The objective of this prospective randomized multicenter study was to compare the efficacy, safety, and tolerance of meropenem monotherapy with those of the combination of ceftazidime plus amikacin for the empirical treatment of fever in granulocytopenic cancer patients. Of 1,034 randomized patients, 958 were assessable in the intent-to-treat analysis for response to antibacterial therapy, including 483 in the meropenem group and 475 in the ceftazidime-plus-amikacin group. The median durations of neutropenia were 16 and 17 days, respectively. A successful outcome was reported in 270 of 483 (56%) patients treated with monotherapy compared with 245 of 475 (52%) patients treated with the combination group (P = 0.20). The success rates in the monotherapy group and the combination group were similar by type of infection (single gram-negative bacteremia, single gram-positive bacteremia, clinically documented infection, and possible infection). The occurrence of further infections assessed in patients for whom the allocated regimen was not modified did not differ between the two groups (12% in both groups). Mortality due to the presenting infection or further infection was relatively low (8 patients treated with the monotherapy compared with 13 patients treated with the combination). A total of 1,027 patients were evaluable for adverse events; the proportion of those who developed adverse effects was similar between the two groups (29% in both groups), and only 19 (4%) patients in the monotherapy group and 31 (6%) in the combination group experienced an adverse event related or probably related to the study drug. Allergic reactions were the only reason for stopping the protocol antibiotic(s) (3 and 5 patients, respectively). This study confirms that monotherapy with meropenem is as effective as the combination of ceftazidime plus amikacin for the empiric treatment of fever in persistently granulocytopenic cancer patients, and both regimens were well tolerated.
Gram-positive bacteria have become the predominant infecting organisms in granulocytopenic cancer patients. Empiric antibiotic regimens used in febrile neutropenic patients often include an extended-spectrum cephalosporin, but the response to therapy in gram-positive coccal bacteremia has been unsatisfactory. Thus, new antibiotics with better activity against gram-positive bacteria should be tested. The objective of this prospective randomized controlled study was to evaluate and compare the efficacy and tolerance of piperacillintazobactam plus amikacin with that of ceftazidime plus amikacin, the standard regimen of the International Antimicrobial Therapy Cooperative Group of the European Organization for Research and Treatment of Cancer, in the empiric treatment of febrile granulocytopenic cancer patients. A total of 858 episodes were eligible for this study, and 706 episodes were assessable for efficacy. The antibiotic treatment was successful in 210 (61%) of 342 episodes in the piperacillin-tazobactam-amikacin group compared with 196 (54%) of 364 episodes treated with ceftazidime plus amikacin (P = 0.05). The time to defervescence was significantly shorter (P = 0.01) and the time to failure was significantly longer (P = 0.02) in the piperacillin-tazobactam-amikacin group. A significant difference in response to bacteremic infections between the two patient groups was found: piperacillin-tazobactam plus amikacin was successful in 40 of 80 episodes (50%), and ceftazidime plus amikacin was successful in 35 of 101 episodes (35%) (P = 0.05). A multivariate analysis showed that the probability of failure was significantly greater with ceftazidime plus amikacin than with piperacillin-tazobactam plus amikacin (P = 0.02). This trial suggests that piperacillin-tazobactam plus amikacin is more effective than ceftazidime plus amikacin for the empiric treatment of fever and bacteremia in granulocytopenic cancer patients. Although cutaneous reaction was more frequently associated with piperacillin-tazobactam plus amikacin than with ceftazidime-amikacin, this unwanted effect was relatively mild and its incidence was comparable to that of other penicillin compounds.
BACKGROUND: Intravenously administered antimicrobial agents have been the standard choice for the empirical management of fever in patients with cancer and granulocytopenia. If orally administered empirical therapy is as effective as intravenous therapy, it would offer advantages such as improved quality of life and lower cost. METHODS: In a prospective, open-label, multicenter trial, we randomly assigned febrile patients with cancer who had granulocytopenia that was expected to resolve within 10 days to receive empirical therapy with either oral ciprofloxacin (750 mg twice daily) plus amoxicillin-clavulanate (625 mg three times daily) or standard daily doses of intravenous ceftriaxone plus amikacin. All patients were hospitalized until their fever resolved. The primary objective of the study was to determine whether there was equivalence between the regimens, defined as an absolute difference in the rates of success of 10 percent or less. RESULTS: Equivalence was demonstrated at the second interim analysis, and the trial was terminated after the enrollment of 353 patients. In the analysis of the 312 patients who were treated according to the protocol and who could be evaluated, treatment was successful in 86 percent of the patients in the oral-therapy group (95 percent confidence interval, 80 to 91 percent) and 84 percent of those in the intravenous-therapy group (95 percent confidence interval, 78 to 90 percent; P=0.02). The results were similar in the intention-to-treat analysis (80 percent and 77 percent, respectively; P=0.03), as were the duration of fever, the time to a change in the regimen, the reasons for such a change, the duration of therapy, and survival. The types of adverse events differed slightly between the groups but were similar in frequency. CONCLUSIONS: In low-risk patients with cancer who have fever and granulocytopenia, oral therapy with ciprofloxacin plus amoxicillin-clavulanate is as effective as intravenous therapy.
PURPOSE: A best-case series review is an efficient tool with which to screen complex complementary and alternative treatments for cancer as candidates for further study. STUDY DESIGN: The National Cancer Institute and other agencies have adopted the best-case series method to evaluate cancer treatments involving complementary and alternative medicine (CAM) for further study. The authors conducted a best-case series review of the Hufeland Klinik. Established in 1985 in Bad Mergentheim, Germany, this facility treats more than 500 cancer patients per year. Hufeland treatment includes dietary modification, injections, ozone therapy, active fever therapy, psychotherapy, and sometimes hormone therapy and/or low-dose chemotherapy. The goal of the treatment is to prolong survival and to maintain good quality of life. METHODS: The clinic provided summaries of 27 cases in which patients with longer than expected survival had agreed to make their medical records available for review. The review involved pathologic confirmation of disease and radiologic confirmation of complete response (CR) or partial response (PR) not attributable to conventional treatment. RESULTS: Based on the summaries and an exhaustive 2-year search for medical records, slides, and imaging data, 12 of 27 cases were selected for full review, and 5 (3 CRs and 2 PRs) were judged best cases. CONCLUSION: Most patients with common cancers receive conventional treatment before coming to Hufeland, and many are treated with chemotherapy and/or hormonal therapy while there. Hence, only a few could be considered for review. With 5 of 12 patients showing a treatment response, the authors conclude that the Hufeland treatment merits further study. They also recommend the development of criteria with which to evaluate best-case series reviews of complex CAM treatments for patients with advanced cancer.
A total of 747 febrile granulocytopenic patients with cancer were randomized to receive ceftazidime plus amikacin (CA) with or without vancomycin (V) as initial empirical therapy. Single gram-positive bacteremias responded in 29 (43%) of 68 patients treated with CA and in 48 (72%) of 67 treated with CAV (P = .001). For single gram-negative bacteremias and clinically documented and possible infections the response rates of CA and CAV were 80% and 63% (P = .17), 55% and 75% (P = .009), and 74% and 81% (P = .16), respectively. However, for patients with gram-positive bacteremia and for all other patients, there were no differences by treatment regimens in the proportion of febrile patients on each trial day (P = .85, P = .82, respectively) or in the duration of fever (P = .22, P = .93, respectively). Moreover, no patient with gram-positive bacteremia died during the first 3 days of true empirical therapy. Antibiotic-associated nephrotoxicity was more frequent in patients treated with vancomycin (6% vs. 2%, P = .02). These results do not support the empirical addition of vancomycin to initial antibiotic therapy in cancer patients with fever and granulocytopenia.
The treatment of fever and neutropenia following chemotherapy lends itself well to outpatient parenteral antimicrobial therapy (OPAT). Patients prefer to be at home rather than hospitalized again. There is a clear cost advantage of outpatient therapy. With a quality program and careful patient selection, OPAT can be provided effectively and safely. The chances of an infection due to resistant bacteria also appear to be reduced. There are an increasing number of studies that support the use of empiric antibiotic therapy for the first fever in neutropenic patients. The choice of antimicrobial, dose, as well as vascular access and infusion devices must be tailored to the individual patient needs and circumstances.
Clavulanic acid, a potent beta-lactamase inhibitor, was studied in fixed combination with ticarcillin and used with tobramycin as empiric therapy for fever in the immunocompromised host. Fifty febrile episodes were evaluated in patients with hematologic malignancy and/or neutropenia. Eighty-one percent of evaluable infections treated with the study regimen of ticarcillin, clavulanic acid, and tobramycin responded. Seventy-four percent of evaluable infections treated with the control regimen of piperacillin, tobramycin, and vancomycin responded (p = 0.4). Resistance to piperacillin and ticarcillin were noted in 23.8 percent of 21 isolated organisms. Resistance to ticarcillin and clavulanic acid was noted in only one (4.7 percent) of the isolated organisms (p = 0.092). Untoward reactions, including rash, nephrotoxicity, and superinfection, were unusual and occurred with equal frequency in the study and control groups. Clavulanic acid in combination with ticarcillin was effective and safe in treating fever in the immunocompromised host.
In a study of Lassa fever in Sierra Leone, West Africa, we identified two variables associated with a high risk of death, and we evaluated the efficacy of ribavirin and Lassa virus-convalescent plasma for the treatment of Lassa fever. A serum aspartate aminotransferase level greater than or equal to 150 IU per liter at the time of hospital admission was associated with a case-fatality rate of 55 percent (33 of 60). Patients with the same risk factor who were treated for 10 days with intravenous ribavirin, begun within the first 6 days after the onset of fever, had a case-fatality rate of 5 percent (1 of 20) (P = 0.0002 by Fisher's exact test). Patients whose treatment began seven or more days after the onset of fever had a case-fatality rate of 26 percent (11 of 43) (P = 0.01). Viremia with levels greater than or equal to 10(3.6) TCID50 per milliliter on admission was associated with a case-fatality rate of 76 percent (35 of 46). Patients with this risk factor who were treated with intravenous ribavirin within the first six days after onset of fever had a case-fatality rate of 9 percent (1 of 11) (P = 0.006), whereas those treated after seven days or more of illness had a fatality rate of 47 percent (9 of 19) (P = 0.035). Oral ribavirin was also effective in patients at high risk of death. Lassa-convalescent plasma did not significantly reduce mortality in any of the high-risk groups. We conclude that ribavirin is effective in the treatment of Lassa fever and that it should be used at any point in the illness, as well as for postexposure prophylaxis.
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