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|Year : 2018 | Volume
| Issue : 3 | Page : 722-725
Prognostic value of cerebrospinal fluid lactate in meningitis in postoperative neurosurgical patients
AS Sumanth Kumar, Barada Prasad Sahu, Ashish Kumar
Department of Neurosurgery, Nizam's Institute of Medical Sciences, Hyderabad, Telangana, India
|Date of Web Publication||15-May-2018|
Dr. Barada Prasad Sahu
Department of Neurosurgery, Nizam's Institute of Medical Sciences, Punjagutta, Hyderabad - 500 082, Telangana
Source of Support: None, Conflict of Interest: None
Objective: To evaluate the prognostic usefulness of cerebrospinal fluid (CSF) lactate in postoperative bacterial meningitis (POBM) and to establish the optimal CSF lactate cut-off values in our population to identify POBM in neurosurgical patients.
Patients and Methods: A prospective study of postoperative neurosurgical patients with presumed and established bacterial meningitis in the Department of Neurosurgery, NIMS, Hyderabad, India, from September 2012 to December 2014. The diagnostic and prognostic values of CSF lactate have been evaluated and compared with other well-established CSF markers. All the patients who have undergone intradural cranial surgery with features of meningism have been included.
Results: The study included 37 patients. The CSF value of the first lumbar puncture (LP) was taken to evaluate the diagnostic value of CSF lactate. Twenty three corresponded to Group A, and 14 to Group B. The mean CSF lactate in Group A was 5.94 ± 2.36, and in Group B 4.60 ± 2.31. Subsequent LPs were performed and CSF analyzed to evaluate the prognostic value of CSF lactate. The CSF markers like neutrophil count (P = 0.003), CSF/blood glucose ratio (P = 0.012), CSF lactate (P = 0.024), lymphocyte count (P = 0.046), leukocyte count (P = 0.047) have shown their prognostic value in a descending order. CSF markers like the presence of red blood cells (P = 0.540) and proteins (P = 0.757) did not show prognostic significance. The decline in CSF lactate (content and concentration) after initiation of antibiotics correlated with subsidence of fever (P = 0.0001), decrease in neck rigidity (P = 0.022) and improvement in sensorium. They were also correlated improvement in CSF/blood glucose ratio and CSF white blood cell counts.
Conclusions: In our study, CSF lactate was noted to have a dependable prognostic value in POBM. As routine CSF markers can be ambiguous in POBM, CSF lactate can be considered a better alternative for both establishing the diagnosis and prognostication.
Keywords: Bacterial meningitis, cerebrospinal fluid, lactate, postoperative
Serial cerebrospinal fluid lactate estimation is a good marker for the diagnosis and prognostication of postoperative bacterial meningitis, especially when routine CSF markers like glucose level, leucocytic or lymphocytic count, or the presence of red blood cells in CSF have not provided an unequivocal evidence of the presence of bacterial meningitis following surgery.
|How to cite this article:|
Sumanth Kumar A S, Sahu BP, Kumar A. Prognostic value of cerebrospinal fluid lactate in meningitis in postoperative neurosurgical patients. Neurol India 2018;66:722-5
|How to cite this URL:|
Sumanth Kumar A S, Sahu BP, Kumar A. Prognostic value of cerebrospinal fluid lactate in meningitis in postoperative neurosurgical patients. Neurol India [serial online] 2018 [cited 2018 Nov 18];66:722-5. Available from: http://www.neurologyindia.com/text.asp?2018/66/3/722/232330
Bacterial meningitis (BM) is not so common in an elective neurosurgery setting and it is a serious nosocomial infection that complicates intradural procedures. It has an incidence of 2.2% and a mortality of 5%. It increases the length of intensive care and hospital stay and increases the overall cost of hospital care. The diagnosis is sometimes difficult to establish due to the masked clinical signs and alteration in cerebrospinal fluid (CSF) values because of the presence of blood in CSF. Diagnosis is often assumptive because patients are on broad-spectrum antibiotics per-operatively and for prevention of other co-infections. In the last few years, CSF lactate level has proven to be a valid ancillary test for the diagnosis of postoperative BM (POBM) due to the ease, precision, and rapidity with which it may be measured in the clinical laboratory.,
CSF lactate is produced largely by the brain during normal anaerobic glycolysis by inter-conversion from pyruvate via the action of lactate dehydrogenase (LDH). In BM, there will be influx of inflammatory cells leading to global cerebral edema and hypoperfusion secondary to vasospasm, and loss of autoregulatory mechanism further leading to ischemia and anaerobic metabolism. In addition, the elevated CSF lactate level that commonly accompanies a low CSF glucose level strongly suggests that increased anaerobic metabolism contributes to these changes. Varying amount of lactate is produced by the bacteria itself accounting for 10% of total CSF lactate.,,,
In our study, we aimed to evaluate the prognostic value of CSF lactate by assessing its serial values and by comparing them with the clinical improvement of patients. This would enable us to obtain important information regarding the response to antibiotics and guide us to timely change the antibiotics, whenever required.
| » Patients and Methods|| |
This is a prospective study of patients with suspected BM following intradural cranial procedures, from September 2012 to December 2014, in the Department of Neurosurgery, Nizam's Institute of Medical Sciences, Hyderabad, India. All the patients were started on preoperative antibiotics. The antibiotics were continued until 3–5 days after the postoperative period. The indication for lumbar puncture (LP) for CSF analysis was 'suspected BM', characterized by new onset of fever, altered mental status, seizures and neck rigidity, or any other signs of meningism. The CSF collected was subjected to analysis for cell counts (leukocytes, neutrophils, and erythrocytes), routine biochemistry (glucose and protein), and microbiological examination (gram stain and cultures). The blood sugar levels were checked at the time of LP. For estimation of lactate, the CSF was sent to another facility about 0.5 km from the primary hospital.
All infective pathologies such as cerebral abscess, empyema, epidural abscess; the presence of an immunocompromised patient; and/or the presence of a patient with signs of systemic infection, were excluded from the study. The mean day of performing the first, second, and third LP was the 6th, 11th, and 16th postoperative day, respectively. The patients who underwent the first LP were categorized into Group A and Group B. Group A included patients with leukocytes >250/cumm or neutrophils >50% (favoring BM)., Rest were included in Group B (not favoring BM). Subsequent LPs were performed to evaluate the prognostic value of CSF lactate and the values obtained were compared with other markers.
Data were entered into the Microsoft Excel spreadsheet, and descriptive statistical analysis was done using SPSS (Statistical Package for Social Sciences) version 20. Results on continuous measurements were presented as mean and standard deviation. Results on categorical measurements were presented as percentages. Significance was assessed at 5% level of significance. The chi-square test was used to assess the significance of the study parameters on a categorical scale between the groups. The analysis of variance (ANOVA) test was used to assess the significance of the study parameters on a continuous scale between the groups. Receiver operating characteristic (ROC) curves were used for the diagnostic test evaluation of the CSF markers.
| » Results|| |
A total of 37 patients were included in the study. The patient demographics such as the age, sex, diagnosis, and the categorized groups are shown in [Table 1]. The first LP was performed, and CSF analysis was done for evaluating the diagnostic values of the markers. According to the preset criteria, 23 patients corresponded to Group A, and 14 to Group B. The mean CSF lactate in Group A was 5.94 ± 2.36, and in Group B, 4.60 ± 2.31 (P = 0.1 [not significant, NS]). There was no significant difference noted between the two groups [Table 2].
The diagnostic value of CSF lactate was evaluated by ROC analysis by taking Group A as the positive control [Figure 1] and [Table 3]. The value of ROC was 0.67, considered to have a poor diagnostic accuracy (excellent: 0.90–1.00; good: 0.80–0.89; fair: 0.70–0.79; poor: 0.60–0.69; failure: 0.50–0.59). The sensitivity was 73.91% and the specificity was 28.57%. The cut-off value of 5.2 was derived based on the highest point of sensitivity and specificity on the ROC curve.
|Figure 1: Receiver operating characteristic curve for cerebrospinal fluid lactate (Group A as positive control)|
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|Table 3: Diagnostic value of CSF lactate (Group A taken as positive control)|
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Subsequent LPs were performed, and the CSF was analyzed to evaluate the prognostic value of CSF lactate [Table 4] and [Figure 2]. For P values, the mean and standard deviation of the first and second LP CSF analyses were compared. The CSF markers such as neutrophil count (P = 0.003), CSF/blood glucose ratio (P = 0.012), CSF lactate (P = 0.024), lymphocyte count (P = 0.046), and leukocyte count (P = 0.047) were shown to have a good prognostic value in a descending order of significance. CSF markers such as red blood cell (RBC) (P = 0.540) and protein (P = 0.757) did not show any prognostic significance.
Along with other CSF markers, the decline of CSF lactate with initiation of antibiotics was correlating with clinical improvement of patients with regard to fever (P = 0.0001) and neck rigidity (P = 0.022) [Table 5].
| » Discussion|| |
An early diagnosis of BM in the postoperative neurosurgical patients is crucial in reducing the morbidity by the timely initiation of appropriate antibiotics. Due to many factors (preoperative antibiotics, steroids, surgical manipulation, etc.), the conventional markers (CSF glucose, CSF/plasma glucose ratio, CSF protein, and CSF total number of leukocytes) are less dependable in a postoperative setting. In two different meta-analyses, it was revealed that CSF lactate has an excellent overall diagnostic accuracy compared to other conventional markers  and has a high sensitivity and specificity in differentiating bacterial versus aseptic meningitis, both in adults and children., Many studies have shown the benefits of CSF lactate in meningitic patients [Table 6]. Maskin et al., in their largest prospective study, have confirmed the sensitivity of CSF lactate levels even in patients receiving antibiotic treatment. Conduction of the LP procedure in irritable and uncooperative patients can result in the collection of blood-stained CSF, and in these patients, the usual markers (especially the cell counts) are not dependable, whereas CSF lactate does not alter significantly with a changing plasma lactate level or CSF neutrophil and RBCs count. In addition to its diagnostic value, CSF lactate is also helpful as a good prognostic indicator, showing a rapid decline after the initiation of antibiotics.,
In our study, we have taken the cut-off value of 4 mmol for CSF lactate and evaluated its diagnostic value by comparing this value with the the CSF lactate values obtained in Group A patients (meningitis group). Our results have shown the poor diagnostic accuracy of CSF lactate, contrary to the findings of a few other studies. Apart from the diagnostic aspect, we have evaluated CSF lactate for its prognostic significance by comparing the subsequent serial LP CSF analysis with the clinical improvement of the patient, which has shown that CSF lactate has got a significant prognostic value that is comparable to other conventional markers.
| » Limitations of Our Study|| |
We had less number of cases to derive an appropriate cut-off value. Also, CSF lactate was performed at another facility due to which there might be a time difference between the sample collection and the analysis of CSF lactate in each case.
| » Conclusions|| |
CSF lactate has been proven to be a good diagnostic marker in establishing POBM by other studies. In our study, CSF lactate was noted to have a dependable prognostic value in POBM. As routine CSF markers can often be inconclusive in POBM, CSF lactate can be considered a better alternative for both its diagnosis and prognostication.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5], [Table 6]