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[Basic and clinical study of meropenem in pediatric field].

Meropenem (MEPM), a novel parenteral carbapenem antibiotic, was examined in a cooperative study involving 12 pediatric and 1 neonatologic facilities. The results are summarized as follows. 1. Antibacterial activity Antibacterial activity of MEPM against stock organisms including 31 strains of Streptococcus agalactiae, 14 of Listeria monocytogenes, 4 of Bordetella pertussis and 3 of Neisseria meningitidis ranged from 0.025 to 0.10 micrograms/ml in MIC90's, which were equal or lower than those of control drugs such as imipenem cefazolin, cefotiam, cefotaxime, ceftazidime and latamoxef. MICs against clinical isolates were as follows: In Gram-positive bacteria, MICs were 0.20 micrograms/ml to 6.25 micrograms/ml against 3 strains of Staphylococcus aureus, and 0.025 micrograms/ml or less against 4 of Streptococcus pneumoniae. In Gram-negative bacilli, MICs were 0.10 micrograms/ml to 0.20 micrograms/ml against 3 strains of Haemophilus influenzae and 0.78, 0.10 and 0.78 micrograms/ml, respectively, against one strain each of Enterobacter cloacae, Morganella morganii and Pseudomonas aeruginosa. MIC against 1 strain of Peptococcus saccharolyticus was < or = 0.025 micrograms/ml. 2. Pharmacokinetics Maximum plasma concentrations after intravenous infusion of MEPM over 30 minutes at doses of 10, 20 and 40 mg/kg, respectively, to 3 different groups of 3 children (total 9 cases) were observed at the completion of the treatment. Mean maximum concentrations in the 3 groups were 36.3, 69.5 and 129.8 micrograms/ml, respectively, exhibiting clear dose response. Mean plasma half lives in beta phase were 0.94, 0.86 and 0.94 hours, respectively, exhibiting no difference by doses, and this trend was observed also by HPLC. Urinary excretion rates in the first 6 hours after dose in the 10, 20 and 40 mg/kg groups were 67.3, 65.6 and 68.4%, respectively. Concentrations of MEPM in cerebrospinal fluid were determined in 2 cases of pyogenic meningitis. In 1 case, 500 mg (5.9 mg/kg) of MEPM was infused intravenously over 30 minutes and concentrations on Days 6, 8 and 15 observed at 190, 60 and 100 minutes after respective doses were 0.13, 0.10 micrograms/ml and less than the detection limit. Cerebrospinal fluid-plasma concentration ratio was determinable only on Day 8 and was 2.8%. In another case to which 250 mg (38.5 mg/kg) of MEPM was infused intravenously over 30 minutes, the concentration at Days 6, 7 and 10, 1 hour after the dose were less than the detection limit on day 6, and 2.04 and 2.62 micrograms/ml, respectively on days 7 and 10. 3. Clinical efficacy Clinical efficacies were evaluated in 49 cases and the efficacy rate was 93.9%.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗

[Effect of meropenem on fecal flora in children].

Meropenem (MEPM, SM-7338), a novel parenteral carbapenem antibiotic, was examined for its effect on intestinal flora in children. Seven children with infectious diseases (3 male and 4 female children of age's ranging from 4 months to 8 years and 9 months weighing from 7.3 to 23.0 kg) were treated with MEPM at doses ranging 10.3 to 40.5 mg/kg 3 or 4 times a day for 6 to 12 days. Before, during and after the treatment, identities and numbers of various bacteria contained in 1 g of feces were determined and fecal beta-lactamase activity and Clostridium difficile D-1 antigen were also assayed. Changes in fecal flora during MEPM treatment was somewhat different depending on cases. Regarding Enterobacteriaceae among aerobes, all of 7 cases exhibited moderate or pronounced reductions in Escherichia coli. Some of the cases exhibited the tendency to increase in Klebsiella oxytoca. Enterobacter cloacae and Citrobacter freundii. E. coli which was reduced during the treatment increased rapidly after the treatment in 5 out of 7 cases, and the initial bacterial counts were restored. Diverse strains were observed within the genus Enterococcus, while the overall bacterial counts of this genus exhibited the tendency to increase during the treatment. As a result, no significant change in total aerobe count was observed in any case except 1 case where Enterococcus count was somewhat reduced. Among anaerobes, major bacteria such as Bacteroides, Bifidobacterium, Eubacterium and Peptococcaceae exhibited tendencies to decrease in some cases during the antibiotic treatment. Two infants and 1 child exhibited significant decreases in total anaerobe counts. In most of the cases, such changes in major anaerobes were transient and bacterial counts recovered to their initial values rapidly after completion of the treatment. In no cases, glucose non-fermentative Gram-negative bacilli or fungus became predominant. Although C. difficile D-1 antigen was observed in 4 cases, its changes had no relationship with characteristics of feces. C. difficile was not detected in any of the cases. MEPM was detected in feces in 4 cases being treatment, in concentrations ranging from 0.35 to 66.0 micrograms/g. Fecal MEPM levels were very low except in 1 case in which beta-lactamase was negative. From these results, effects of MEPM on intestinal flora in children were relatively minor compared to other new beta-lactam drugs. However, a care should be taken to minimize diarrhea and bacterial turnover when a prolonged use of the antibiotic, was practiced because of potential significant effects on intestinal flora.

Age Factors↗

[Laboratory and clinical evaluation of meropenem in pediatric field].

We performed laboratory and clinical evaluation of meropenem (SM-7338, MEPM), a new carbapenem antibiotics, in pediatric field. Pharmacokinetics of MEPM was examined with 5 patients, at a dose of 10 mg/kg via 30 minutes drip infusion. Mean plasma concentrations at 30 minutes, 1, 1.5, 2.5, 3.5 and 5.5 hours after dose were 18.8, 6.97, 3.62, 1.14, 0.43 and 0.12 micrograms/ml, respectively, with a half life of 0.96 hour. The urine recovery rate in 6 hours was 70.4%. Clinical efficacy of MEPM was evaluated in 36 patients with various infectious diseases. MEPM was administered at doses ranging 9.5 to 30.6 mg/kg/dosage, 3 to 4 times a day, 21/3 to 10 days. Clinical effects were excellent in 24, good in 11, fair in 1, with an efficacy rate of 97.2%. Bacteriologically, all causative organisms except one each of Haemophilus influenzae and Salmonella enteritidis were eradicated, an eradication rate for Gram-positive and Gram-negative bacteria were 100% and 93.3%, respectively. No side effects were observed. Elevations of GOT and/or GPT were noted in 2 patients. From the above results, we believe that MEPM is a highly effective and safe drug for patients with various infectious diseases in pediatric fields.

Age Factors↗

[Therapeutic effects of meropenem against severe infections in patients with hematopoietic disorders. Hanshin Study Group of Hematopoietic Disorders and Infection].

The efficacy and the safety of meropenem (MEPM), a newly developed carbapenem antibiotic, were investigated in 150 patients with severe infections complicated with hematopoietic disorders. 1. Clinical responses in 132 patients who were evaluable for effectiveness were excellent in 33 patients, good in 45, fair in 10 and poor in 44, with an efficacy rate of 59.1%. 2. The efficacy rate in patients who had previously been treated with the other antibiotics was 51.2%, while that in patients who had not been thus treated was 62.9%. 3. The efficacy rate in patients whose neutrophil counts increased during the therapy with MEPM was higher than that in patients whose neutrophil counts did not increase. The efficacy rate in patients whose neutrophil counts during the therapy were below 100/mm3 was 48.1%. 4. Out of 150 cases, side effects were observed in 4 patients, 3 with eruption and 1 with jaundice. Abnormalities in laboratory test results on liver functions were noted in 8 patients. These results indicate that MEPM is an effective and safe antibiotic for the treatment of severe infections in patients with hematopoietic disorders.

Adolescent↗

[Clinical and pharmacokinetic evaluation of meropenem and its effect on fecal flora in children].

Forty-five children were treated with meropenem (MEPM) and the clinical efficacy and side effects were evaluated. The ages of the patients ranged from 1 month to 9 years and their body weights from 5.2 to 25 kg. Doses given were 17.2-45.5 mg/kg every 6 to 8 hours for 2 to 24.5 days. Those patients who responded to the MEPM treatment included 15 children with pneumonia, 7 with pharyngitis, 3 with cervical lymphadenitis, 3 with cellulitis, 10 with urinary tract infections and 4 with other infections. Among 42 children, the results were excellent in 29, good in 12 and fair in 1. The drug was well tolerated, although slightly elevated serum concentrations of transaminases occurred in 5 patients, eosinophilia in 2 patients, and neutropenia in 1 patient among 45 patients examined. The pharmacokinetic studies on MEPM were done in 6 patients. Their ages ranged from 2 to 9 years and body weights from 14.5 to 23.2 kg. In 4 patients, plasma concentrations at the end of 30 minutes drip infusion of 20 mg/kg were 29.28 +/- 10.29 micrograms/ml and those 3 hours later were 0.49 +/- 0.26 micrograms/ml. Serum elimination half-lives of the drug were 0.66 +/- 0.12 hours in these patients. Excretion rates of this drug into urine in the first 6 hours after initiation of drug administration were 53 and 40% in 2 of these patients. In 2 patients with 35 and 44 mg/kg of drug administration, plasma concentrations were higher than those given 20 mg/kg of the drug.(ABSTRACT TRUNCATED AT 250 WORDS)

Bacterial Infections↗

[Clinical pharmacology and efficacy of meropenem].

We studied a newly developed carbapenem, meropenem (MEPM), and obtained the following results. 1. Pharmacokinetics of MEPM in pediatrics was examined in 3 patients. MEPM was injected intravenously at a dose of 16-22 mg/kg by drip infusion for 30 minutes, and its concentrations in serum and urine were determined using bioassay. The average peak value of serum levels of MEPM was 38.4 micrograms/ml and T1/2 beta of MEPM was 1.26 hours. The urinary recovery rate for the first 6 hours after administration was 65.6%. 2. Clinical evaluations of MEPM in pediatrics were done in 14 patients with ages ranging, 1 month to 14 years, with various bacterial infections. Excellent or good clinical responses were observed in all patients, and bacteriological eradication were obtained in 7 out of 8 cases. No serious side effects were observed in any cases, but 2 showed mild and transient GOT, GPT elevations.

Adolescent↗

[Clinical evaluation of meropenem in the pediatric field].

We studied the clinical efficacy of meropenem (SM-7338, MEPM), a new parenteral carbapenem beta-lactam antibiotic, in pediatric field. Thirteen patients with 2 months to 8 years and 8 months of ages, with acute infectious diseases were administered with doses at 39.3 to 76.7 mg/kg/day of MEPM intravenously. The diagnoses consisted of 7 respiratory tract infections, 1 sepsis, 2 orbital cellulitis, 1 parotid abscess, 1 lymphadenitis and 1 pyoderma. The clinical efficacy rate was 84.6% (11/13), and the bacteriological eradication rate was 71.4% (5/7). Clinical laboratory examinations revealed 1 patient with eosinophilia and another with anemia. No other side effects attributable to this drug were observed. It appears that MEPM is a useful antibiotic for moderate to severe acute bacterial infections in children.

Bacterial Infections↗

[Bacteriological and clinical studies on meropenem in the pediatric field].

Bacteriological and clinical studies have been performed on meropenem (MEPM, SM-7338), a newly developed carbapenem antibiotic, in the pediatric field. 1. Antibacterial activities of MEPM against 24 clinical isolates were determined. MEPM showed excellent activity against Gram-positive bacteria including Staphylococcus aureus and Gram-negative bacteria, especially Escherichia coli and Branhamella catarrhalis. Against Haemophilus influenzae, MEPM had a higher activity than imipenem and flomoxef, but had a lower activity than piperacillin and cefoperazone. 2. Clinical efficacies of MEPM were evaluated in 32 cases with bacterial infections. A poor efficacy was observed in 1 patient with phlegmon but excellent or good efficacies were obtained in other 31 patients with tonsillitis (1), pneumonia (17), UTI (12), or SSSS (1). The overall efficacy rate was 96.9%. All strains except 1 of S. aureus were eradicated by the administration of MEPM, and a high eradication rate of 95.8% (23 out of 24 strains) was obtained. 3. No side effects were observed in 35 evaluated cases. As abnormal laboratory test results, elevated GOT, elevated GPT, eosinophilia and neutropenia were noted in 4, 4, 4 and 2 patients, respectively. 4. Influences on blood coagulation parameters were studied. PIVKA II was elevated upon administration of MEPM in some cases, but no changes in ATT, TT, HPT or Fbg were observed during the treatment. Based on the above results, it has been concluded that MEPM is a safe and effective drug to use in the treatment of pediatric infections. The usual recommended dosage and administration should be 10 to 20 mg/kg of MEPM at a time, using intravenous drip infusion, 3 times a day.

Adolescent↗

[Nationwide surveillance of parenteral antibiotics containing meropenem activities against clinically isolated strains in 2002].

The antibacterial activity of meropenem (MEPM) and other parenteral antibiotics against clinical isolates of 899 strains of Gram-positive bacteria, 1500 strains of Gram-negative bacteria, and 158 strains of anaerobic bacteria obtained from 28 medical institutions during 2002 was measured. The results were as follows; 1. MEPM was more active than other carbapenem antibiotics against Gram-negative bacteria, especially against enterobacteriaceae and Haemophilus influenzae. MIC90 of MEPM against Pseudomonas aeruginosa was the lowest of the drugs tested. MEPM showed low cross-resistant rate against both imipenem-resistant P. aeruginosa and ciprofloxacin-resistant P. aeruginosa. MEPM was active against most of the species tested in Gram-positive and anaerobic bacteria, except for multi-drug resistant strains including methicillin-resistant Staphylococcus aureus (MRSA), methicillin-resistant Staphylococcus epidermidis (MRSE). 2. The proportion of extended-spectrum beta-lactamase (ESBL) strains was 3.1% (4 strains) in Escherichia coli and 1.9% (2 strains) in Klebsiella pneumoniae. Carbapenems including MEPM were active against these ESBL strains. In conclusion, the results from this surveillance study suggest that MEPM retains its potent and broad antibacterial activity and therefore is a clinically useful carbapenem; at present, 7 years after available for commercial use.

Bacteria↗

[Transferability of meropenem to cerebrospinal fluid in rabbits with meningitis caused by Staphylococcus aureus].

The transferability of meropenem (MEPM) to cerebrospinal fluid (CSF) was studied employing rabbits with experimental meningitis caused by Staphylococcus aureus. The mean serum concentration was 93.1 +/- 13.5 micrograms/ml at 15 minutes after intravenous administration of MEPM at a dose level of 100 mg/kg. The mean concentration in CSF was maximum at 15 minutes after administration at 4.42 +/- 2.24 micrograms/ml. Pharmacokinetic parameters calculated from these values were as follows: Cmax (CSF/serum) 4.75%, AUC (CSF/serum) 10.4% between 15 and 60 minutes, 13.9% between 15 and 120 minutes and 15.7% between 15 and 180 minutes, T 1/2 for MEPM in CSF: 50.9 minutes, T 1/2 (CSF/serum): 2.19. In comparison to those of imipenem which were obtained in the same way, the transferability of MEPM was similar and in consideration of the antimicrobial potency against the main pathogens of meningitis, it appears worth-while of running clinical trials for this drug.

Animals↗

[Clinical and pharmacokinetic evaluations of meropenem in children].

Twenty-five children were treated with meropenem (MEPM, SM-7338) and the clinical efficacy and side effects were evaluated. Ages of the patients ranged from 9 months to 11 years. Dose levels of MEPM ranged from 50.4 to 108 mg/kg/day for 4 to 8 days. The 25 patients included 11 pneumonia cases, 4 bronchitis, 6 tonsillitis, 3 urinary tract infections and 1 gingivitis, and they were evaluated for the clinical efficacy of MEPM. Results were excellent in 13 and good in 12 patients. No side effects nor abnormal clinical laboratory test results were observed. The pharmacokinetics of MEPM was studied in 7 patients with ages ranging from 9 to 15 years. The mean plasma peak concentration of MEPM in 5 patients was 36.7 micrograms/ml after dosing 10 mg/kg, and that of 2 patients was 70.0 micrograms/ml after administering 20 mg/kg. These data showed that plasma concentrations of drug depended on dose levels. Average half-life values for the 2 groups (10 and 20 mg/kg) were 0.83 and 0.85 hour, respectively. Urinary recovery rates for the 2 groups (10 and 20 mg/kg) were 64.3% and 81.3%, respectively, in the first 5 hours after administration.

Absorption↗

[Clinical evaluation of meropenem in the pediatric field].

A clinical study on a new carbapenem antibiotic, meropenem (MEPM), was carried out in acute pediatric infections. MEPM was administered to 8 patients including 3 patients with acute pneumonia, 2 with cervical lymphadenitis, 1 with acute tonsillitis, and 1 with cellulitis and 1 with sepsis. The overall efficacy rate was 100%. As an adverse reaction, diarrhea was observed in 1 patient. In clinical laboratory tests 1 patient was found to have S-GPT elevation which normalized after discontinuation of MEPM. MEPM appears to be effective and safe drug for pediatric acute infections.

Adolescent↗

[Pharmacokinetic, bacteriological and clinical studies on meropenem in children].

Pharmacokinetic, bacteriological and clinical studies on meropenem (MEPM) were performed in children. The results are summarized as follows: 1. A total of 16 patients was treated with MEPM. Each dose was 20 mg/kg, and administration was made 3 times daily using 30-minute intravenous drip infusion for 5-28 days. Clinical efficacies of MEPM in 16 patients with bacterial infections (1 with purulent meningitis, 1 with suspected subdural abscess, 2 with suspected sepsis, 4 with pneumonia, 1 with acute maxillar sinusitis, 2 with cervical abscess, 1 with acute gastroenteritis, 2 with skin soft tissue infection and 2 with urinary tract infection) were evaluated as excellent in 7 patients, good in 8 patients and fair in 1 patient with an efficacy rate of 93.8%. Fourteen causative organisms found in 11 patients (Streptococcus pneumoniae in 4, Branhamella catarrhalis in 3, Staphylococcus aureus in 3, Group B Streptococcus in 1, Escherichia coli in 3) were all eradicated. No adverse reactions were observed in any of the 16 patients. 2. MICs of MEPM against 6 clinically isolated bacteria (B. catarrhalis 2, S. pneumoniae 3 and S. aureus 1) from children with bacterial infections were examined. MEPM showed good antibacterial activities. 3. Pharmacokinetic studies: Peak plasma concentrations of MEPM averaged 43.07 micrograms/ml (37.20-46.30 micrograms/ml) at dose of 20 mg/kg administered by 30-minute drip infusion. In the first 8 hours after administration, the urinary excretion rates of MEPM averaged 39.9% of the administered dose.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗

[Studies of meropenem in pediatric infections].

Pharmacokinetic and clinical evaluations of meropenem (SM-7338, MEPM) were carried out in pediatric patients. The following results were obtained. 1. After 30-minute intravenous drip infusion at a dose of 20 mg/kg, plasma concentrations of MEPM reached their peaks at the end of drip infusion with an average value of 48.8 +/- 3.64 micrograms/ml, and the average plasma half-life was 0.93 +/- 0.21 hour in the beta-phase. After 30-minute intravenous drip infusion at a dose of 10 mg/kg, the average peak plasma concentration was 27.7 +/- 4.33 micrograms/ml and the average plasma half-life was 0.78 +/- 0.20 hour. 2. Urinary excretion rates of MEPM after 30-minute intravenous drip infusion at doses of 20 and 10 mg/kg were 44.8 +/- 4.54% and 40.9 +/- 1.78%, respectively. 3. MEPM was administered to 13 cases (upper and lower respiratory infections, pneumonia and lymphadenitis) at daily doses between 60-90 mg/kg/day divided into 3 dosages using 30-minute intravenous drip infusion. Clinical responses were "excellent" in 12 patients, "good" in 1, hence an efficacy rate of 100% was obtained. 4. Bacteria identified in various disease cases included 12 strains of 5 species, and the eradication rate was 100%. 5. No side effects were observed in any children. Laboratory test results showed abnormalities in 2 cases with elevations of GOT and GPT. These results suggest that MEPM may be a very useful and safe drug for the treatment of pediatric infections.

Bacterial Infections↗

[Clinical study on meropenem in pediatric field].

We studied clinical effects of meropenem (MEPM, SM-7338), a newly developed parenteral carbapenem beta-lactam drug, and following results were obtained. The patients were administered with 16-20 mg/kg of MEPM every 8 hours using 1 hour drip infusion. 1. Clinical effects of MEPM were studied in 10 children with various infectious diseases: 1 with acute bronchitis, and 2 each with acute tonsillitis, acute bronchopneumonia, acute pneumonia, acute urinary infection, and 1 with pertussis pneumonia. The case of pertussis pneumonia later developed bronchiolitis obliterans, hence a steroid and gamma-globulin were used. This case was excluded from the clinical evaluation. The efficacy rate was 100% (9/9), and the bacteriological eradication rate was 100% (6/6). 2. No side effects were noted. Clinical laboratory test values were investigated in 10 patients. There was a case of abnormal laboratory test findings with mild elevations of liver functions such as GOT, GPT, and gamma-GTP. These abnormalities disappeared in 1 week after the end of therapy.

Bacterial Infections↗

[Pharmacokinetic and clinical studies on meropenem].

Pharmacokinetic and clinical studies on meropenem (MEPM, SM-7338), a new developed carbapenem, were performed and the following results were obtained. 1. Absorption/excretion: Pharmacokinetics of MEPM was studied in 9 children using doses of 10 mg/kg and 20 mg/kg by a 30 minute-drip infusion. Peak plasma levels and plasma half-lives of the 2 doses were 28.4 and 43.0 micrograms/ml, and 0.70 and 0.80 hours, respectively. Their urinary recovery rates were 42.5 to 67.6% and 29.9 to 62.6%, respectively. Cerebrospinal fluid levels and penetration rates of MEPM in a patient with purulent meningitis were 0.66 to 4.01 micrograms/ml and 1.6 to 12.2%, respectively. 2. Clinical study: Forty-nine patients were treated with MEPM at doses exceeding 100 mg/kg/day with purulent meningitis and 30 to 60 mg/kg/day with other infections. MEPM gave "excellent" or "good" responses in 48 cases, an efficacy rate of 98.0%. Only one patient with subdural abscess showed fair response. Diarrhea and rash were observed in 1 case each. Abnormal laboratory test results were noted in 5 patients including elevation of GOT, GPT and eosinophils. In no cases the treatment had to be discontinued.

Absorption↗

[Clinical evaluation of a new carbapenem, meropenem, in infants and children].

A new carbapenem antibiotic, meropenem (MEPM), was evaluated for its safety and efficacy in 33 infants and children. MEPM was effective in all the 32 evaluable cases including 4 cases of bacterial meningitis and 5 cases of Pseudomonas aeruginosa infections. The mean half life of plasma concentrations of MEPM was 0.84 +/- 0.09 hours after 30 minutes intravenous drip infusion. Mild diarrhea (2 cases), transient elevation of transaminases (8 cases), and transient eosinophilia (2 cases) were associated with the MEPM therapy, but none of them was problematic. These data suggest that MEPM is safe in infants and children and could be one of the therapeutic agents for severe infections or infections in compromised hosts.

Adolescent↗

[Laboratory and clinical studies on meropenem in pediatrics].

Laboratory and clinical studies on meropenem (MEPM), a new carbapenem antibiotic, were carried out in the field of pediatrics. The results obtained are summarized below. 1. The antibacterial activities of MEPM against clinically isolated organisms in our department were generally high. 2. After 30 minutes intravenous drip infusion of MEPM at a dose of 20 mg/kg to 2 children, the mean peak plasma level of MEPM was 32.7 micrograms/ml at the end of infusion with a mean half-life of 1.45 hours. The mean cumulative urinary recovery rate in the first 6 hours after infusion was 43.6%. 3. Fifteen patients with various bacterial infections were treated with MEPM. The clinical efficacy rate was 100% and the bacteriological efficacy rate was 95.2%. 4. No side effects were observed except in 1 case of mild diarrhea. Some abnormal laboratory test results were obtained, but they were mild with slight elevations of GOT and GPT in 2 cases.

Bacteria↗