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F Gudiol

Publications and source records attributed to F Gudiol.

At least 19 recordsLinked to original sources
PubMed2006

Efficacy of high doses of levofloxacin in experimental foreign-body infection by methicillin-susceptible Staphylococcus aureus.

Antimicrobial efficacy in orthopedic device infections is diminished because of bacterial biofilms which express tolerance to antibiotics. Recently, the use of high doses of levofloxacin with rifampin has been recommended for staphylococcal infections. In the present study, we evaluated the efficacy of levofloxacin at doses of 50 mg/kg/day and 100 mg/kg/day (mimicking the usual and high human doses of 500 mg/day and 750 to 1,000 mg/day, respectively) and compared it to that of to linezolid, cloxacillin, vancomycin, and rifampin in a rat tissue cage model of experimental foreign-body infection by Staphylococcus aureus. The antimicrobial efficacy in vitro (by MIC, minimum bactericidal concentration, and kill curves) for logarithmic- and stationary-phase bacteria was compared with the in vivo efficacy. In vitro bactericidal activity at clinically relevant concentrations was reached by all drugs except rifampin and linezolid in the log-phase studies but only by levofloxacin in the stationary-phase studies. The bacterial count decreases from in vivo tissue cage fluids (means) for levofloxacin at 50 and 100 mg/kg/day, rifampin, cloxacillin, vancomycin, linezolid, and controls, respectively, were: -1.24, -2.26, -2.1, -1.56, -1.47, -1.15, and 0.33 (all groups versus controls, P < 0.05). Levofloxacin at 100 mg/kg/day (area under the concentration-time curve/MIC ratio, 234) was the most active therapy (P = 0.03 versus linezolid). Overall, in vivo efficacy was better predicted by stationary-phase studies, in which it reached a high correlation coefficient even if the rifampin group was excluded (r = 0.96; P < 0.05). Our results, including in vitro studies with nongrowing bacteria, pharmacodynamic parameters, and antimicrobial efficacy in experimental infection, provide good evidence to support the use of levofloxacin at high doses (750 to 1,000 mg/day), as recently recommended for treating patients with orthopedic prosthesis infections.

Acetamides↗
PubMed2006

Clinical features and outcome of spontaneous bacterial peritonitis in HIV-infected cirrhotic patients: a case-control study.

The aim of this study was to evaluate the clinical characteristics and outcome of spontaneous bacterial peritonitis, a serious complication in patients with cirrhosis and ascites, in an HIV-infected cirrhotic population. Thirty-five HIV-infected cirrhotic patients who developed spontaneous bacterial peritonitis during a 12-year period were compared with 70 non-HIV-infected cirrhotic subjects. Patients were matched according to the date of the first episode of spontaneous bacterial peritonitis. A bacteriological diagnosis was made in 37 of 47 (79%) and in 50 of 97 (52%) episodes in the HIV group and in the non-HIV group, respectively (p=0.003), and Streptococcus pneumoniae was isolated more frequently in the HIV group (22 vs. 8%, p=0.02). Median survival after the initial diagnosis of spontaneous bacterial peritonitis was 2.9 and 14.0 months in the HIV group and non-HIV group, respectively. Age (hazard ratio [HR] 1.04; 95%CI 1.01-1.07), male sex (HR 2.55; 95%CI 1.34-4.83), Child-Pugh score at first spontaneous bacterial peritonitis episode (HR 1.29; 95%CI 1.10-1.54), renal impairment at first spontaneous bacterial peritonitis episode (HR 2.61; 95%CI 1.49-4.62), and HIV infection (HR 9.81; 95%CI 4.03-23.84) were independently associated with higher long-term mortality after the first diagnosis of spontaneous bacterial peritonitis. In conclusion, HIV-infected cirrhotic patients with spontaneous bacterial peritonitis have a higher rate of bacteriological diagnosis and a more frequent pneumococcal etiology than non-HIV-infected subjects. Life expectancy in these patients, once spontaneous bacterial peritonitis has developed, is poor. These data are particularly relevant for determining the optimal time for liver transplantation in this population.

Adult↗
PubMed2006

Effect of prior pneumococcal vaccination on clinical outcome of hospitalized adults with community-acquired pneumococcal pneumonia.

The aim of this study was to evaluate the effect of prior pneumococcal vaccination on the clinical outcome of 554 consecutive hospitalized adults with community-acquired pneumococcal pneumonia from 1995 to 2004, 61 of whom had been vaccinated in the 5 years before admission. Outcome variables that were compared in vaccinated and unvaccinated adults included the occurrence of bacteremia, the time to resolution of pneumonia symptoms, the length of hospital stay, and mortality. Prior pneumococcal vaccination was associated with a lower risk of bacteremia (odds ratio 0.46, 95% CI 0.22-0.98). Compared with unvaccinated patients, vaccine recipients had better clinical outcomes, which included a faster resolution of pneumonia symptoms. The median length of hospital stay was shorter in vaccinated patients (8.0 vs. 9.0 days; p=0.032). Overall case-fatality rates did not differ significantly between groups (1.6% vs. 6.2%; p=0.233). In conclusion, prior pneumococcal vaccination appears to be associated with a lower risk of bacteremia, a faster time to resolution of symptoms, and a shorter hospital stay in adults with pneumococcal pneumonia. The findings presented here provide additional support to the current vaccine recommendations and should encourage healthcare providers to increase pneumococcal vaccine coverage among targeted adult populations.

Aged↗
PubMed2006

Risk-factors for acquisition of extended-spectrum beta-lactamase-producing Escherichia coli among hospitalised patients.

Between 1996 and 2002, 103 hospitalised patients yielding one or more clinical isolates of extended-spectrum beta-lactamase-producing Escherichia coli (ESBL-EC) were identified. A significant increase was observed in the incidence of ESBL-EC colonisation or infection during the study period (1.65 episodes/100 000 patient-days in 1996 to 12.6 episodes/100 000 patient-days in 2002; p 0.01). Infection developed in 70 (68%) patients (75 episodes), with surgical site (44%) and urinary tract (17%) infections being the most frequent. Pulsed-field gel electrophoresis showed extensive clonal diversity among the isolates. A case-control study and multivariate analysis identified female gender (OR 2.1; p 0.01), use of a nasogastric tube (OR 3.5; p 0.001) and previous antibiotic therapy (OR 3.9; p < 0.001) as independent variables associated with acquisition of ESBL-EC. The study demonstrated a progressive increase in the number of ESBL-EC isolates in a non-epidemic setting. Most cases of ESBL-EC colonisation or infection occurred in hospitalised patients exposed to invasive procedures and antibiotic pressure.

Adolescent↗
PubMed2004

Experimental study of teicoplanin, alone and in combination, in the therapy of cephalosporin-resistant pneumococcal meningitis.

OBJECTIVES: The aim of the study was to determine the efficacy of teicoplanin, alone and in combination with ceftriaxone, in a rabbit model of cephalosporin-resistant pneumococcal meningitis, and to assess the effect of concomitant therapy with dexamethasone. METHODS: In vitro killing curves of teicoplanin, with and without ceftriaxone, were performed. Groups of eight animals per treatment were inoculated with a cephalosporin-resistant pneumococcal strain (penicillin MIC, 4 mg/L; ceftriaxone MIC, 2 mg/L; teicoplanin MIC, 0.03 mg/L) and treated over a 26 h period. Teicoplanin was administered at a dose of 15 mg/kg, alone and in combination with ceftriaxone at 100 mg/kg with or without dexamethasone at 0.25 mg/kg. CSF samples were collected at different time-points, and bacterial titres, white blood cell counts, lactate and protein concentrations and bacteriostatic/bactericidal titres were determined. Blood and CSF teicoplanin pharmacokinetic and pharmacodynamic parameters were determined. RESULTS: Teicoplanin alone promoted a decrease in bacterial counts at 6 h of -2.66 log cfu/mL and was bactericidal at 24 h, without therapeutic failures. Similar good results were obtained when dexamethasone was used simultaneously, in spite of the penetration of teicoplanin into the CSF being significantly reduced, from 2.31% to 0.71%. Teicoplanin and ceftriaxone combinations were synergic in vitro, but not in the meningitis model. CONCLUSIONS: Teicoplanin alone was very effective in this model of cephalosporin-resistant pneumococcal meningitis. The use of concomitant dexamethasone resulted in lower CSF teicoplanin levels, but not in therapeutic failures. The combination of teicoplanin plus ceftriaxone and dexamethasone might be a good alternative for the empirical therapy of pneumococcal meningitis. Additional data should confirm our experiments, in advance of clinical trials to assess efficacy in humans.

Animals↗
PubMed2004

Group B streptococcal disease in nonpregnant adults: incidence, clinical characteristics, and outcome.

A retrospective review of 150 cases of group B streptococcal disease in nonpregnant adults over an 8-year period was performed in a single tertiary-care teaching hospital to determine the incidence, clinical spectrum, and outcome of the disease. Incidence increased from 0.53 cases per 1,000 admissions in the 1993-1994 period to 0.96 cases per 1,000 admissions in 1999-2000 (P=0.013, chi-square test for trend). Bacteremia also increased from 0.15 to 0.42 cases per 1,000 admissions over the same period of time (P=0.005, chi-square test for trend). The mean age of the patients was 61.4 years, and 92% had at least one underlying disease. Bacteremia was detected in 60.9% of patients in whom blood cultures were performed. Fourteen (9.3%) patients died. Factors independently associated with an increased risk of dying were shock at diagnosis (OR, 23.96; 95%CI, 3.44-166.57; P=0.001) and cancer (OR, 4.96; 95%CI, 1.43-17.20; P=0.012). Group B streptococcal disease in nonpregnant adults is on the rise in the hospital investigated, particularly in persons with underlying conditions. The clinical spectrum of the disease ranges from localized to severe bacteremic infections. Shock at diagnosis and cancer are factors independently associated with a higher fatality rate.

Adult↗
PubMed2004

Staphylococcus aureus nasal carriage in patients on haemodialysis: role of cutaneous colonization.

We performed a prospective study of Staphylococcus aureus nasal carriage in patients on chronic haemodialysis to determine the role of cutaneous colonization in the aetiology of recurrent nasal colonization. From February 2000 to September 2001, 71 patients on chronic haemodialysis in the dialysis unit at a university hospital were screened monthly for S. aureus nasal carriage. Carriers received nasal mupirocin for five days and were tested for nasal and cutaneous carriage two days later and monthly thereafter. Using genotyping results, recurrence was defined as relapse if pretreatment and subsequent nasal isolates were clonally identical; if the isolates were different, it was considered recolonization. Thirty-nine patients (55%) were nasal carriers: 11 initially and 28 during follow-up. Among the mupirocin-treated patients, the eradication of S. aureus nasal carriage rate was 88.5%. Nasal recurrence was documented in 17 patients (43.5%), and S. aureus nasal strains were available for molecular typing in 14 patients with a total of 23 recurrence episodes. On the basis of pulsed-field gel electrophoresis analysis, 16 (70%) recurrence episodes were considered relapses and seven were considered (30%) recolonizations. Among the episodes of relapse, prior cutaneous colonization was detected in only three cases. In haemodialysis patients, the majority of nasal carriage recurrences after mupirocin therapy were due to relapses. Cutaneous colonization does not appear to be relevant in the development of these relapses.

Anti-Bacterial Agents↗
PubMed2004

Incidence and molecular typing of Mycobacterium kansasii in a defined geographical area in Catalonia, Spain.

A retrospective population-based study was conducted between January 1990 and December 1998 to investigate the incidence of Mycobacterium kansasji disease and the heterogeneity of the isolates in a well-defined geographical area in Catalonia, Spain. A total of 136 patients were identified. Overall incidence and incidence in AIDS patients was 1.5 (95% CI 1.2-1.8) and 1089.6 (95% CI 689-1330) cases/100,000 persons per year respectively, which is comparable to that reported from most of other geographical areas. Surprisingly, although 7 subtypes of M. kansasii have been consistently reported, in the present study 91 of the 93 isolates (97.8%) tested for genotype were subtype I, regardless of HIV status of the patients. In conclusion, the high rate of infection observed in the AIDS population contributes significantly to the burden of the M. kansasii disease in our area. M. kansasii disease in our geographical area was almost exclusively caused by subtype I regardless of HIV status.

Acquired Immunodeficiency Syndrome↗
PubMed2003

Efficacy and safety of sequential amoxicillin-clavulanate in the treatment of anaerobic lung infections.

In order to assess the efficacy and safety of amoxicillin-clavulanate for the treatment of anaerobic lung infection, 40 patients with lung abscess or necrotizing pneumonia were given sequential amoxicillin-clavulanate therapy. All patients received intravenous amoxicillin-clavulanate (2 g/200 mg/8 h), which was switched to oral form (1 g/125 mg/8 h) after clinical improvement. Mean duration of antibiotic therapy was 43.5 days. Microbiological documentation was obtained in 53% of cases. All but 1 of the 48 microorganisms isolated were susceptible to amoxicillin-clavulanate. The drug was well tolerated by the patients and no severe adverse effects were observed. At the end of treatment all patients were considered cured. The 35 patients assessed at long-term follow-up visit remained disease-free.

Adult↗
PubMed2003

Factors associated with complications and mortality in adult patients hospitalized for infectious cellulitis.

The aim of this study was to analyze medical outcomes, including risks for complications and mortality, in 332 adult patients hospitalized for cellulitis. The infection was documented microbiologically in 128 cases (39%). Staphylococcus aureus (46 cases) and Streptococcus pyogenes (22 cases) were the most frequent causative pathogens. Overall, 63 patients (19%) were discharged early (< or =4 days) and 166 patients (50%) were hospitalized for more than 4 days without developing any complications. One hundred three patients (31%) had one or more complications or died. Of these, 78 required surgical debridement, 10 required plastic surgery, 7 underwent amputation, and 15 had shock on presentation. When comparing the three study groups (patients discharged early, patients hospitalized for < or =4 days without complications, and patients who developed 1 or more complication or who died), patients who were discharged early (low risk) were more frequently female and were less likely to have multiple comorbid conditions, hypoalbuminemia, renal insufficiency, and/or cutaneous necrosis at presentation. Overall mortality (<30 days) was 5% (16/332 patients). Factors associated with death were male sex, presence of multiple comorbid conditions, congestive heart failure, morbid obesity, hypoalbuminemia, renal insufficiency, shock, and Pseudomonas aeruginosa cellulitis. These findings can be used to stratify patients with acute cellulitis according to risks for complications and mortality and may be helpful when deciding the most appropriate means of care, i.e. outpatient treatment or hospitalization.

Adolescent↗
PubMed2003

An outbreak of carbapenem-resistant Pseudomonas aeruginosa in a urology ward.

OBJECTIVE: To investigate an outbreak of carbapenem-resistant Pseudomonas aeruginosa (CRPA) in a urology ward. METHODS: Patients infected or colonized with CRPA were prospectively identified by daily laboratory surveillance. Routine infection-control measures were reinforced, disinfection protocols were revised, and a surveillance program was set up, analyzing cross-transmission in the nursing ward and environment cultures from urology wards and the operating theater. CRPA isolates from clinical and environment samples were studied by pulsed-field gel electrophoresis (PFGE), following XbaI and SpeI restriction. RESULTS: From February 1998 to September 2000, 59 adult urology patients were colonized or infected by CRPA. All patients had been operated on prior to identification of the CRPA isolate and 79% of these procedures were performed in the same cystoscopy room. No patients had received prior carbapenem therapy. No cross-transmission was detected, and environment cultures from the urology ward and theater were negative except for five samples collected in the cystoscopy room. PFGE identified a single clone in the isolates from different patients and the environment samples. CONCLUSIONS: The PFGE analysis indicated that the CRPA outbreak resulted from the contamination of the cystoscopy room via an unsealed drain. The outbreak ended when the drain was sealed.

Anti-Bacterial Agents↗
PubMed2003

Experimental study of clinafloxacin alone and in combination in the treatment of ciprofloxacin-susceptible and -resistant pneumococcal meningitis.

The increasing incidence of ciprofloxacin resistance in Streptococcus pneumoniae may limit the efficacy of the new quinolones in difficult-to-treat infections such as meningitis. The aim of the present study was to determine the efficacy of clinafloxacin alone and in combination with teicoplanin and rifampin in the therapy of ciprofloxacin-susceptible and ciprofloxacin-resistant pneumococcal meningitis in rabbits. When used against a penicillin-resistant ciprofloxacin-susceptible strain (Clinafloxacin MIC 0.12 microg/ml), clinafloxacin at a dose of 20 mg/kg per day b.i.d. decreased bacterial concentration by -5.10 log cfu/ml at 24 hr. Combinations did not improve activity. The same clinafloxacin schedule against a penicillin- and ciprofloxacin-resistant strain (Clinafloxacin MIC 0.5 microg/ml) was totally ineffective. Our data suggest that a moderate decrease in quinolone susceptibility, as indicated by the detection of any degree of ciprofloxacin resistance, may render these antibiotics unsuitable for the management of pneumococcal meningitis.

Animals↗
PubMed2002

Epidemiology and prognosis of bacteremia: a 10-y study in a community hospital.

In order to determine the epidemiology and factors influencing the outcome of adult bacteremia in a community hospital, episodes of significant bacteremia were recorded prospectively over a 10-y period (1989-98). The following variables were included: age, sex, etiology, acquisition and source of the bacteremia, risk factors, clinical manifestations, empirical antibiotic treatment and outcome. A total of 798 episodes of bacteremia were recorded (436 in males) and 185 (24%) were hospital-acquired. The most frequent source was the urinary tract, followed by the respiratory tract and primary bacteremia. The crude mortality was 14.4% (n = 111) and related mortality was 8.5% (n = 66). The most frequent etiology was Escherichia coli, followed by Streptococcus pneumoniae and Staphylococcus aureus. Multivariate analysis revealed age > 70 y, nosocomial acquisition, respiratory source, primary bacteremia, septic shock, McCabe groups I and II, leukopenia, inappropriate antibiotic treatment and etiology due to S. aureus as factors associated with crude mortality. Pseudomonas aeruginosa, Proteus spp. and Bacteroides spp. were associated with related mortality. In conclusion, it is possible to modify or eliminate factors influencing the outcome of adult bacteremia. The prevention of nosocomial infection, the use of support therapies in critical patients and appropriate antibiotic treatment are measures that can improve the prognosis of patients with bacteremia.

Adult↗
PubMed2002

Experimental study of the efficacy of vancomycin, rifampicin and dexamethasone in the therapy of pneumococcal meningitis.

The object of the study was to assess the efficacy of rifampicin and the combination of rifampicin plus vancomycin in a rabbit model of experimental penicillin-resistant pneumococcal meningitis. We also studied the effect of concomitant dexamethasone on the CSF antibiotic levels and inflammatory parameters. The rabbit model of pneumococcal meningitis was used. Groups of eight rabbits were inoculated with 106 cfu/mL of a cephalosporin-resistant pneumococcal strain (MIC of cefotaxime/ceftriaxone 2 mg/L). Eighteen hours later they were treated with rifampicin 15 mg/kg/day, vancomycin 30 mg/kg/day or both plus minus dexamethasone (0.25 mg/kg/day) for 48 h. Serial CSF samples were withdrawn to carry out bacterial counts, antibiotic concentration and inflammatory parameters. Rifampicin and vancomycin promoted a reduction of >3 log cfu/mL at 6 and 24 h, and cfu were below the level of detection at 48 h. Combination therapy with vancomycin plus rifampicin was not synergic but it had similar efficacy to either antibiotic alone and it was able to reduce bacterial concentration below the level of detection at 48 h. Concomitant use of dexamethasone decreased vancomycin levels when it was used alone (P< 0.05), but not when it was used in combination with rifampicin. Rifampicin alone at 15 mg/kg/day produced a rapid bactericidal effect in this model of penicillin-resistant pneumococcal meningitis. The combination of vancomycin and rifampicin, although not synergic, proved to be equally effective. Using this combination in the clinical setting may allow rifampicin administration without emergence of resistance, and possibly concomitant dexamethasone administration without significant interference with CSF vancomycin levels.

Animals↗
PubMed2002

Efficacy of colistin versus beta-lactams, aminoglycosides, and rifampin as monotherapy in a mouse model of pneumonia caused by multiresistant Acinetobacter baumannii.

The treatment of life-threatening infections due to carbapenem-resistant Acinetobacter baumannii has become a serious challenge for physicians worldwide. Often, only colistin shows in general good in vitro activity against these carbapenem-resistant strains, but its antibacterial efficacy in comparison with the antibiotics most used in clinical practice is not well known. We studied the efficacy of colistin versus those of imipenem, sulbactam, tobramycin, and rifampin in an experimental pneumonia model with immunocompetent mice. We used three strains of A. baumannii corresponding to the main clones (A, D, and E) involved in the outbreaks of our hospital, with different grades of resistance to imipenem (imipenem MICs of 1, 8, and 512 microg/ml, respectively) and to the other antibiotics. The MIC of colistin was 0.5 microg/ml for the three strains. Reduction of log(10) CFU/g in lung bacterial counts, clearance of bacteremia, and survival versus results with controls were used as parameters of efficacy. Imipenem and sulbactam (Deltalung counts: -5.38 and -4.64 log(10) CFU/ml) showed the highest level of bactericidal efficacy in infections by susceptible and even intermediate strains. Tobramycin and rifampin (-4.16 and -5.15 log(10) CFU/ml) provided good results against intermediate or moderately resistant strains, in agreement with killing curves and pharmacodynamics. On the contrary, colistin showed the weakest antibacterial effect among the antibiotics tested, both in killing curves and in the in vivo model (-2.39 log(10) CFU/ml; P < 0.05). We conclude that colistin did not appear as a good option for treatment of patients with pneumonia due to carbapenem-resistant A. baumannii strains. Other alternatives, including combinations with rifampin, may offer better therapeutic profiles and thus should be studied.

Acinetobacter↗
PubMed2002

Effects of antibiotics on protected specimen brush sampling in ventilator-associated pneumonia.

The effects of antibiotic treatment on the results of protected specimen brushing (PSB) in ventilator-associated pneumonia were prospectively assessed by performing this procedure before antibiotic treatment, and 12, 24, 48 and 72 h after initiation of antibiotic treatment, in 35 ventilated patients who developed pneumonia during mechanical ventilation. The number of micro-organisms isolated, their concentration (colony-forming units (cfu) mL(-1)), and the number of cases with a positive PSB (> or =10(3) cfu x mL(-1)) were evaluated. Within 12 h of the initiation of effective antibiotic treatment a rapid, significant decrease in the numbers of organisms isolated, their individual concentrations and the percentage of positive PSB results were observed. Certain bacterial species (Streptococcus pneumoniae, Haemophilus influenzee) appeared to be more vulnerable to antibiotics than others (Staphylococcus aureus, Pseudomonas aeruginosa, Acinetobacter baumanni). This data confirms that prior antibiotic treatment, even after only a few hours of activity, significantly decreases the sensitivity of protected brush specimen; this effect appears to be particularly marked among the species involved in early ventilator associated pneumonia.

Adolescent↗
PubMed2001

Pneumococcal peritonitis in adult patients: report of 64 cases with special reference to emergence of antibiotic resistance.

BACKGROUND: Few data are available regarding pneumococcal peritonitis. We studied the clinical characteristics of intra-abdominal infections caused by Streptococcus pneumoniae and its prognosis in relation to antibiotic resistance. METHODS: We reviewed all cases of culture-proved pneumococcal peritonitis. Patients with liver cirrhosis and primary pneumococcal peritonitis were compared with patients with Escherichia coli peritonitis. RESULTS: Between January 1, 1979, and December 31, 1998, we identified 45 cases of primary pneumococcal peritonitis in patients with cirrhosis and 19 cases of secondary (or tertiary) pneumococcal peritonitis. Patients with cirrhosis and primary pneumococcal peritonitis vs those with primary E coli peritonitis had more frequent community-acquired infection, 73% vs 47%; pneumonia, 36% vs 2%; and bacteremia, 76% vs 33%; and higher attributable mortality (early mortality), 27% vs 9% (P<.05 for all). Secondary (or tertiary) pneumococcal peritonitis was associated with upper or lower gastrointestinal tract diseases; in most cases, the infection appeared after surgery. A hematogenous spread of S pneumoniae from a respiratory tract infection might be the most important origin of peritonitis; also, S pneumoniae might directly reach the gastrointestinal tract favored by endoscopic procedures or hypochlorhydria. There was an increased prevalence of penicillin and cephalosporin resistance up to 30.7% and 17.0%, respectively, although it was not associated with increased mortality rates. CONCLUSIONS: Primary pneumococcal peritonitis in patients with cirrhosis more often spread hematogenously from the respiratory tract and was associated with early mortality. In secondary (and tertiary) pneumococcal peritonitis, a transient gastrointestinal tract colonization and inoculation during surgery might be the most important mechanisms. Current levels of resistance were not associated with increased mortality rates.

Adult↗