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Clinical research

Duration of empirical therapy in neonatal bacterial meningitis with third generation cephalosporin: a multicenter retrospective study

Zhi Zhao
,
Xueying Hua
,
Jialin Yu
,
Haibo Zhang
,
Juhua Li
,
Zhankui Li

Arch Med Sci 2019; 15 (6): 1482–1489
Online publish date: 2018/07/05
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Introduction

Bacterial meningitis occurs more commonly in the first month of life than any other period, and frequently in infants associates with early onset sepsis (EOS) and late onset sepsis (LOS). The mortality from meningitis is close to 100% in untreated individuals and is still up to 40% in children who receive appropriate antibiotic treatment in developing countries [13]. Although in the United Kingdom the case fatality associated with neonatal meningitis declined from 25% to 10% between the 1980s and 1990s, long-term sequelae rates did not change, with up to 50% of survivors having long-term neurodevelopmental complications [46]. Early identification and prompt antibiotic treatment are essential for reducing mortality and morbidity. Decisions on the choice of a specific antimicrobial agent are based on knowledge of its activity against the causative pathogen and relative penetration into cerebrospinal fluid (CSF) in the presence of meningeal inflammation. In 2004, the Infectious Disease Society of America published practice guidelines for treatment of meningitis. A 14-day course is sufficient for neonates with uncomplicated group B streptococcus (GBS) meningitis and for other Gram-positive organisms, while a 21-day course of therapy is required for neonates with complicated GBS meningitis and Gram-negative microorganisms. If abscesses, multiple areas of infarction, or ventriculitis occur, it is suggested to administer antibiotics for 6–8 weeks [710]. However, in this practice’s guidelines the duration of antimicrobial therapy has often been based more on tradition than on evidence-based data. Isolation of a pathogen in culture is a prerequisite for proven bacterial meningitis. Culture results take at least 48–72 h to be reported. In addition, its positivity rate is low, especially in the CSF, and is affected by sample volume inoculated, prenatal antibiotic use, level of bacteremia and laboratory capabilities. The early and appropriate initiation of antimicrobial agents in high risk neonates before the result of blood and (or) CSF culture susceptibility is defined as “empirical antibiotic therapy”. With the worldwide increase in the prevalence of penicillin-resistance pneumococci, combination therapy with a third-generation cephalosporin (ceftriaxone sodium used in this study) plus vancomycin has become the standard approach to empirical antimicrobial therapy. The purpose of this study was to evaluate the effect of ceftriaxone treatment. Ceftriaxone sodium was used with penicillin partially plus vancomycin at the beginning of the treatment, which was immediately stopped if the clinical manifestations or test results improved (generally in 3–5 days). Hence, the cases included in this study were treated with ceftriaxone sodium only in the maximum period for treatment.

Third generation cephalosporin given to neonates with bacterial meningitis can rapid sterilize the cerebrospinal fluid in almost all patients [1113] and it is the recommended treatment in many countries [14, 15]. For neonatal bacterial meningitis with negative CSF culture, the duration of antibiotic treatment is long and often associated with neurological sequelae, even though bacteria are no longer present and the baby is asymptomatic, because the treating physician fears stopping prematurely [16]. This prolonged and unnecessary use of antimicrobial treatment is associated with unnecessary costs and potential side-effects in neonates. Currently the duration of treatment in neonatal bacterial meningitis with negative CSF culture is based more on clinical experience than solid evidence [1519]. In this study, we discuss the duration of treatment for clinical prognosis of neonatal bacterial meningitis.

Material and methods

Data collection

This study was approved by the Institutional Review Board of the Children’s Hospital of Chongqing Medical University (Approval No. 03/2016) and the Chinese Ethics Committee of Registering Clinical Trials (Approval No. ChiCTR-EOC-16008048). Medical records were collected for full-term (gestation age ≥ 37 weeks) neonates with neonatal bacterial meningitis. Symptoms or clinical findings were categorized as not present if they were not mentioned in the medical records. From January 2010 to December 2014, we enrolled 282 full-term neonates (31 infants with cyanotic congenital heart disease, 16 infants with positive CSF culture, and 35 were also excluded from the analysis as no clinical data were available due to transfer to other centers) referred to us from 5 different neonatology departments in Chongqing and Shanxi Province, China. Including 110 cases collected from the Children’s Hospital of Chongqing Medical University, 12 cases were collected from Shanxi Province People’s Hospital, 110 cases were from the Children’s Hospital of Xi’an, 40 cases were from the Children’s Hospital of Xianyang and 10 cases were from the Northwest Women and Children’s Hospital. Table I lists the exclusion criteria for the study and diagnostic criteria for bacterial meningitis. Meningitis occurring in the first 72 h of life was defined as early-onset meningitis (EOM) and that occurring beyond 72 h was defined as late-onset meningitis (LOM) [2022].

Table I

Study criteria for enrolment and diagnosis

Exclusion criteria at enrolment
Gestation age < 37 weeks
Pre-existing seizure disorders, cerebral palsy, degenerative neurological disorders
Known immunodeficiency states
Active viral infections
Known hypersensitivity to cephalosporins
Cyanotic congenital heart disease
Positive CSF culture
Diagnostic criteria for bacterial meningitis
Clinical variables:
 Temperature instability
 Heart rate ≥ 180 beats/min or ≤ 100 beats/min
 Respiratory rate > 60 breaths/min plus grunting or desaturations
 Lethargy/altered mental status
 Glucose intolerance (plasma glucose > 10 mmol/l)
 Feed intolerance
 Positive CSF Gram stain
Inflammatory variables:
 Leukocytosis (WBC count > 34 × 109/l) or leukopenia (WBC count < 5 × 109/l)
 CSF absolute neutrophil count 1000/μl or above
 Thrombocytopenia < 100 × 109/l
 CRP > 10 mg/l or 2 SD above normal value
 Procalcitonin > 8.1 mg/dl or 2 SD above normal value
 WBC counts in CSF exceeding 21 × 106/l
 CSF protein concentration > 1500 mg/l
 CSF glucose concentration < 30 mg/dl or less than 50% of blood glucose

[i] CSF – cerebrospinal fluid, WBC – white blood cells, CRP – C-reactive protein.

Outcome data were scored according to the Glasgow Outcome Scale (GOS) at discharge. The clinical status was evaluated with the GOS as follows: 1 – death, 2 – persistent vegetative state, 3 – severe disability, 4 – moderate disability, 5 – good recovery or only minor sequelae [23]. Moderate or severe disability was defined as any of the following conditions: spasticity or muscle weakness in one or more limbs, hydrocephalus, seizures disorder and hearing loss. According to the criteria of GOS, patients were classified into two prognosis groups: good (155 cases, 77.5%. GOS = 5) or adverse (45 cases, 22.5%. GOS = 1–4). Five was considered favorable and 1–4 as unfavorable.

Statistical analysis

All statistical analyses were performed using SAS9.4. Clinical characteristics of the two groups were described by mean values and standard deviations (median and interquartile ranges were used for non-normally distributed variables) or rate and column percentages, according to the type of variable. Student’s t-test was used to compare continuous variables between the groups (Mann-Whitney U test was used for non-normally distributed variables) and the χ2 test and Fisher’s exact test were used for categorical variables. P-values < 0.05 were considered statistically significant.

Results

During the study period, 200 neonates with meningitis were identified among 407 referred infants. There were 126 male infants and 74 female infants. There were 167 non-prenatal infections and 33 prenatal infections. The mean birth weight was 3253 ±485 g. There were 11 (5.5%) neonates with low birth weight (< 2500 g) and 9 (4.5%) with high birth weight (> 4000 g). The mean age at onset of meningitis was 12.1 ±8.6 days. The average duration of hospital stay was 21.0 ±7.3 days (range: 4–43 days). There were 33 (16.5%) cases identified as EOM and 167 (83.5%) as LOM. The overall prenatal infection rate was 16.5% (33 of 200 patients) including 19 cases of maternal fever greater than 38°C, 11 cases of prolonged rupture of membranes over 18 h, and vaginal colonization with group B Streptococcus was noted in 3 cases. In the investigation of the final outcome of patients, it was observed that the mortality rate was 5.5%. The mortality among infants in 2 cases was due to failure to control the worsening of the disease, and in 9 cases treatment was stopped by their families. There were no other infections during the treatment. However, 10 cases were complicated with polyelectrolyte disorder and another 10 cases were complicated with lung dysfunction.

Ceftriaxone is active against most bacteria causing neonatal sepsis and meningitis including some resistant to first line therapy. However, ESBL (extended spectrum β-lactamase) mediated resistance to third-generation cephalosporin has appeared among neonatal pathogens. Complications due to ventriculitis, hydrocephalus, convulsions, and relapse were reported in 64/200 (32%) of infants.

The clinical manifestation of meningitis was highly variable. Some infants presented with nonspecific signs of sepsis, while other infants exhibited signs associated with the central nervous system (CNS), such as irritability, lethargy or seizures. The commonest presenting symptoms in meningitis were fever in 153 (76.5%), problems with feeding in 70 (35%), lethargy or seizures in 40 (20%) and jaundice in 39 (19.5%). Other clinical manifestations were apnea, hypoglycemia, hypotonia, cyanosis and respiratory rate > 60 per min, heart rate > 180 beats/min or < 100 beats/min and axillary temperature > 37.5°C or < 35.5°C. In general, seizures were often the initial manifestation of meningitis.

Peripheral blood leukocytes varied between 3.0 × 109/l and 40.19 × 109/l with a mean of 15.61 × 109/l including 30 cases of leukocytosis and 5 of leukopenia. Neutrophils varied between 10% and 93% with a mean of 49.85%. There were 105 cases with a C-reaction protein (CRP) level over 8 mg/l and 97 cases with procalcitonin (PCT) over 0.5 ng/ml.

Positive cultures of blood were obtained in 49 (24.5%) cases, with 28 (57.1%) cases of Gram-negative bacilli infections. Escherichia coli (13/49), Klebsiella pneumoniae (9/49) and Staphylococcus haemolyticus (5/49) were the commonest pathogenic bacteria. Other organisms were Staphylococcus epidermidis (4/49), Streptococcus agalactiae (3/49), Staphylococcus aureus (2/49), Acinetobacter baumannii (2/49), and Enterococcus faecium (2/49) (Table II).

Table II

Distribution of bacterial pathogens detected in blood culture in early-onset meningitis (EOM) and late-onset meningitis (LOM)

Pathogenic bacteria EOM (n = 8)NPathogenic bacteria LOM (n = 41)N
Gram-positive bacilli (n = 4):Gram-positive bacilli (n = 18):
Staphylococcus haemolyticus1Staphylococcus haemolyticus4
Staphylococcus epidermidis1Staphylococcus epidermidis3
Streptococcus agalactiae1Staphylococcus aureus2
Listeria monocytogenes1Enterococcus faecium2
Streptococcus agalactiae2
Staphylococcus saprophyticus2
Pediococcus pentosaceus1
Staphylococcus hominis1
Bacillus subtilis1
Gram-negative bacilli (n = 4):Gram-negative bacilli (n = 23):
Klebsiella pneumoniae3Escherichia coli12
Escherichia coli1Klebsiella pneumoniae6
Acinetobacter baumannii2
Stenotrophomonas maltophilia1
Pseudomonas aeruginosa1
Serratia marcescens1

Cerebrospinal fluid cell count varied between 0 and 9680 × 106/l with a median of 76 × 106/l, including 93 cases with the number of cells more than 100 × 106/l. Cerebrospinal fluid protein concentration varied between 148 and 6670 mg/l, with a median of 1265 mg/l. Mean CSF glucose level was 2.08 ±0.96 mmol/l, CSF glucose level varied between 0.1 and 5.96 mmol/l, and there were 66 cases with CSF glucose < 1.7 mmol/l.

Glasgow Outcome Scale and neurological complications

According to the criteria of the GOS, patients were divided into two outcome groups: good (155 cases, 77.5%, GOS = 5) or unfavorable (45 cases, 22.5%, GOS = 1–4) when we analyzed the effect of the duration of treatment in term infants on prognosis. Twenty-nine infants (64.4%) had moderate disability and other neurologic complications evidenced by cranial sonography or magnetic resonance imaging/computed tomography (CT) scan in unfavorable outcome patients including 6 (13.3%) cases of hydrocephalus, 3 (6.7%) of encephalomalacia, 3 (6.7%) of ependymitis, 2 (4.5%) of subdural effusion and 2 (4.5%) of mortality. There was higher frequency of poor outcome for patients with prenatal infection. Thus we separated the patients with prenatal infections from those without prenatal infections when analyzing the effects of other factors on prognosis.

Clinical prognosis and duration of antibiotic treatment

The duration of antibiotic treatment ranged from 4 to 43 days, and the mean therapy time was 19.74 ±7.32 days. Table III presents the relationship between prognosis and duration of 10, 14, 16, 18 and 21 days, respectively. We found that longer than 21 days of third-generation cephalosporin therapy had no impact on clinical prognosis (p > 0.05). Table IV presents the outcomes of our study. We found that shorter hospital stay was associated with unfavorable outcome in 33 prenatal infection infants. The CSF white blood cell and CSF protein and CSF glucose were predictors of unfavorable outcome in 167 non-prenatal infection infants. High CSF cell count increase was associated with unfavorable outcome in 33 prenatal infection infants (Tables III and IV).

Table III

Influence of duration of antibiotic treatment on prognosis

Duration of antibiotic treatment [days]Good outcome (n = 155)Poor outcome (n = 45)χ2 valueP-value
4–10101420.083< 0.001
10–4314531
4–1439217.9790.009
14–4311824
4–1657255.0850.027
16–439820
4–1874305.0040.028
18–438115
4–21104330.6290.471
21–435112
Table IV

One factor analysis in prognosis of 200 bacterial meningitis infants

FactorNon-prenatal infection (n = 167)Prenatal infection (n = 33)
Good outcome (n = 137)Poor outcome (n = 30)P-valueGood outcome (n = 18)Poor outcome (n = 15)P-value
Sex, male81 (59.12%)23 (76.67%)0.072611 (61.11%)23 (73.33%)0.4583
Birth weight < 2500 g9 (6.57%)1 (3.3%)0.69221 (5.57%)0 (0.00%)1.0000
Age at onset [days]13.03 ±8.8412.20 ±8.140.635410.11 ±6.159.60 ±8.130.8393
Hospital stay [days]21.11 ±7.1120.46 ±8.230.361721.88 ±5.9216.22 ±7.220.0212
PROM > 18 h4 (2.92%)5 (10.00%)0.110518 (100.00%)15 (100.00%)
Delivery way:
 Natural delivery89 (64.96%)19 (63.33%)0.52658 (44.44%)8 (53.33%)0.6109
 Delivery acouche4 (2.92%)2 (6.67%)0 (0.00%)0 (0.00%)
 Cesarean44 (32.12%)9 (30.00%)10 (55.56%)7 (46.67%)
 Antibiotic treatment0 (0.00%)0 (0.00%)4 (22.22%)8 (53.33%)0.0643
Clinical symptoms:
 Fever108 (78.83%)20 (66.67%)0.153713 (72.22%)12 (80.00%)0.6037
 Apnea4 (2.92%)2 (6.67%)0.29393 (16.67%)0 (0.00%)0.2330
 Poor feeding25 (18.25%)7 (23.33%)0.52153 (16.67%)3 (20.00%)0.8047
 Jaundice26 (18.98%)5 (16.67%)0.20113 (16.67%)5 (33.33%)0.4184
 Seizures26 (18.98 %)9 (30.00%)0.17912 (11.11 %)3(20.00%)0.4782
Abnormal neuroimaging:
 Cranial sonography32 (58.19%)11 (55.00%)0.80542 (40.00%)0 (0.00%)0.1515
 MRI/CT60 (67.42%)18 (72.00%)0.66318 (57.14%)4 (57.14%)1.0000
Positive cultures of blood:
 Gram-negative bacilli27 (20.00%)9 (33.33%)0.12829 (69.23%)4 (30.77%)0.2208
CSF parameters:
 WBCs [× 106/l]49.53151.65< 0.00156.45159.34< 0.001
 CSF glucose [mmol/l]2.18 ±0.991.78 ±0.900.04561.72 ±0.732.19 ±0.790.0871
 CSF protein [mg/l]1419 ±745.642022 ±1508.090.00151726 ±890.871283 ±900.000.4047
Blood parameters:
 White blood cells [× 109/l]13.67 ±3.0915.23 ±5.980.348013.77 ±6.9816.79 ±6.330.3211
 Neutrophil [%]49.35 ±19.8948.60 ±27.670.862758.08 ±20.9948.50 ±18.330.2111
 Lymphocyte [%]35.54 ±15.2338.35 ±18.540.455330.58 ±9.4535.16 ±12.670.5163
 Platelets [× 109/l]361 ±97.87432 ±120.970.1177284.4 ±78.33431.3 ±84.330.1269
 C-reaction protein > 8 mg/l77 (64.17%)9 (34.62%)0.005514 (77.78%)5 (26.32%)0.0162
 Procalcitonin > 0.5 ng/ml73 (62.39%)9 (31.03%)0.002312 (70.59%)2 (18.18%)0.0068

Discussion

Optimal duration of empiric antimicrobial therapy decreases the development of antimicrobial resistance, prevents unwanted changes in flora found in the Neonatal Intensive Care Unit (NICU), and minimizes unnecessary expenses for infants who have negative blood cultures [24]. Prolonged duration of initial empirical antibiotic therapy is associated with an increased risk of necrotizing enterocolitis and death in extremely low birth weight infants [25]. Other adverse effects of prolonged empirical antibiotic therapy include increased risk of neonatal candidiasis and alteration of gut microflora [2628]. Maintenance of intravenous access for a long period in neonates is difficult and is a burden in many developing countries. Hence, it seems prudent to restrict the duration of empirical antibiotic therapy when blood or CSF cultures are sterile and the neonate is asymptomatic.

These survey data have clinical relevance for the hospital, local health authority as well as for the regional health bureau to implement appropriate meningitis surveillance against this invasive bacterial disease. Clinical and demographic characteristics of study infants segregated into initial empirical antibiotic treatment groups are presented.

The incidence of CSF culture-confirmed meningitis is not high. Nevertheless, there is a strong association between meningitis and sepsis with positive blood cultures [29]. Therefore, many studies report that meningitis is associated with a positive culture from the blood or abnormal cerebrospinal fluid parameters [16, 3032]. Third generation cephalosporin was first reported for the treatment of neonatal bacterial meningitis in 1985, when four neonates presented no sequelae afterward, and it shows several advantages that make it the first-line treatment of meningitis in most developed and developing countries [3336]. Ceftriaxone is active against most bacteria causing neonatal sepsis and meningitis including some resistant to first line therapy, and synergistic interactions against a variety of micro-organisms have been demonstrated.

The pathogenic microorganism of meningitis cases differs according to the geographic region. The most frequently reported etiology is Gram-positive bacilli such as group B streptococci in the developed countries [9, 10, 16]. In our study, the positive blood culture rate was 24.5% and the most common bacteria are Gram-negative bacilli such as in early onset meningitis Klebsiella pneumoniae and Escherichia coli in late onset meningitis. The prognosis and outcome in our study were defined by using clinical status or abnormal neuroimaging examination on hospital discharge and the GOS. We found that shorter hospital stay was associated with unfavorable outcome in 33 prenatal infection infants in our study. This indicates that prenatal infected infants may need longer treatment. Two retrospective studies showed that high CSF protein and low CSF glucose concentration were important prognostic factors of complications in neonatal meningitis [37, 38]. Our study was concordant with this result. Additionally, we found the CSF cell count was associated with unfavorable outcome in term infant meningitis. Though a previous study showed that thrombocytopenia was a main factor of the poor prognostic, the platelet counts in the unfavorable outcome group were not reduced in our study. We advocate rigorous application of ongoing empirical antibiotic treatment and prompt discontinuation of therapy if blood cultures are negative and clinical laboratory measurements indicate a low risk of sepsis. Clinical trials where ceftriaxone has been evaluated in neonates are few. A limitation of this study is the inability to take into account all factors that indicate the severity of illness, although we sought to compare different antibiotic combinations from trials to observe the optimal duration of empirical antibiotic therapy. Additionally, limitations of neonates who developed early sepsis limited the utility of early leukocyte indices and acute phase reactants in identifying culture-negative infants who might benefit from a prolonged duration of antibiotics.

Our study indicated that longer than 21 days of treatment with third generation cephalosporin has no impact on clinical prognosis in term neonates with bacterial meningitis in the negative cerebrospinal fluid culture, and in whom the clinical condition is stable.

In conclusion, we concluded that longer than 3 weeks’ administration of third generation cephalosporin has no impact on the infant’s prognosis. Because the NICU is kind of sanctuary form antimicrobial stewardship, though many antibodies are used in the NICU, which is the beginning point of this retrospective study. Owing to increasing resistance and the very limited arsenal of new agents, especially against Gram-negative pathogens, carefully designed antibiotic regimens are obligatory for the particular patient neonates. Also it is recommended to minimize antibiotic use and its contingent collateral damage.

Conflict of interest

The authors declare no conflict of interest.

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