Complications of tuberculous meningitis and their effect on outcome in a tertiary care cohort

mRNA profiling of cytokines to understand paradoxical response in HIV-uninfected tuberculous meningitis

Paradoxical reaction (PR) in tuberculous meningitis (TBM) is a major management issue. We report mRNA profiling of cytokines to understand PR in HIV-uninfected TBM patients. 72 patients with TBM were included, and their clinical, MRI, and mRNA profiling of tumor necrosis factor (TNF) α, interleukin (IL) 6, IL10 and interferon (IFN) γ genes in the peripheral blood mononuclear cells were done at admission and 6 weeks of antitubercular treatment. Cytokine profiling was done using reverse transcriptase polymerase chain reaction. PR was defined if repeat MRI at 6 weeks revealed new or increase in exudates, tuberculoma, hydrocephalus or infarctions. Outcome was defined at 6 months using modified Rankin Scale (mRS), and categorized as death, poor and good. 44 (61.1 %) patients had PR, and 28 (38.9 %) had paradoxical tuberculoma (PT). The expression of IL6 and TNFα genes were higher in PR and PT groups. Stage of meningitis and hydrocephalus at admission predicted PR. Patients with PR and PT had more frequently poor outcome. About three-fifth HIV-uninfected TBM patients have PR and two-fifth have PT. Paradoxical reaction is associated with higher expression of IL6 and TNFα. Patients with severe meningitis with hydrocephalus develop PR more frequently.

Predictors of fever response in tuberculous meningitis: A clinical, MRI and biomarker study

BACKGROUND

Central nervous system (CNS) has a different immune surveillance system; therefore, fever at admission and timeline of fever response after antitubercular treatment (ATT) may follow a different course in CNS infection. We report the predictors of fever response in tuberculous meningitis (TBM) including the effect of tumour necrosis factor-α (TNF-α) in cerebrospinal fluid (CSF) and its gene expression at mRNA of peripheral blood mononuclear cells (PBMCs).

METHODS

Fifty-seven patients with TBM were prospectively evaluated. Their clinical findings and severity of meningitis were recorded. The expression of TNF-α gene in PBMCs was quantified by real-time polymerase chain reaction and TNF-α concentration in CSF by cytokine bead array both in the patients and 14 matched controls.

RESULTS

All the patients had history of fever for a median duration of 75 days. The admission temperature ranged between 37.2°C and 40°C and correlated with CSF cell counts (p < 0.05). Cranial MRI was abnormal in 54 (94.7%) and revealed exudates in 33(57.9%), hydrocephalus in 27(47.4%), infarction in 27(47.4%) and tuberculoma in 33(57.9%) patients. Fever subsided after a median duration of 18 (2 60) days of treatment. Twelve (21.8%) patients only became afebrile within 10 days. The expression of TNF-α gene correlated with CSF concentration of TNF-α (p = 0.02) and independently predicted duration of defervescence [adjusted hazard ratio 1.02 (95% CI 1.00-1.04; p = 0.01).

CONCLUSION

In the patients with TBM, defervescence takes longer time, and TNF-α gene expression predicts the duration of defervescence. Future studies are needed to evaluate the role of TNF-α-modifying drugs in TBM.

Prognostic factors of adult tuberculous meningitis in intensive care unit: a single-center retrospective study in East China

BACKGROUND

Tuberculous meningitis (TBM) is the most lethal form of tuberculosis worldwide. Data on critically ill TBM patients in the intensive care unit (ICU) of China are lacking. We tried to identify prognostic factors of adult TBM patients admitted to ICU in China.

METHODS

We conducted a retrospective study on adult TBM in ICU between January 2008 and April 2018. Factors associated with unfavorable outcomes at 28 days were identified by logistic regression. Factors associated with 1-year mortality were studied by Cox proportional hazards modeling.

RESULTS

Eighty adult patients diagnosed with TBM (age 38.5 (18-79) years, 45 (56 %) males) were included in the study. An unfavorable outcome was observed in 39 (49 %) patients and were independently associated with Acute Physiology and Chronic Health Evaluation (APACHE) II > 23 (adjusted odds ratio (aOR) 5.57, 95 % confidence interval (CI) 1.55-19.97), Sequential Organ Failure Assessment (SOFA) > 8 (aOR 9.74, 95 % CI 1.46-64.88), and mechanical ventilation (aOR 18.33, 95 % CI 3.15-106.80). Multivariate Cox regression analysis identified two factors associated with 1-year mortality: APACHE II > 23 (adjusted hazard ratio (aHR) 4.83; 95 % CI 2.21-10.55), and mechanical ventilation (aHR 9.71; 95 % CI 2.31-40.87).

CONCLUSIONS

For the most severe adult TBM patients of Medical Research Council (MRC) stage III, common clinical factors aren't effective enough to predict outcomes. Our study demonstrates that the widely used APACHE II and SOFA scores on admission can be used to predict short-term outcomes, while APACHE II could also be used to predict long-term outcomes of adult patients with TBM in ICU.

Standard versus sequential anti-tubercular treatment in patients with tuberculous meningitis: a randomized controlled trial

BACKGROUND

To compare the safety and efficacy of sequential anti-tubercular treatment (ATT) regimen with the standard regimen in tuberculous meningitis (TBM).

METHODS

This single-centre, open-label, parallel group randomized controlled trial was conducted from May 2017 to June 2019 in India. Treatment-naïve patients with TBM fulfilling the inclusion criteria were randomized to four drug ATT regimens (rifampicin, isoniazid, ethambutol and pyrazinamide) administered either simultaneously (standard arm) or one after another (sequential arm) in a 1 : 1 ratio. The primary endpoint was drug-induced hepatitis (DIH) and the secondary endpoints were in-hospital death and disability at 3 and 6 months using a modified Rankin Scale.

RESULTS

A total of 97 patients with TBM were recruited; 15 did not meet the inclusion criteria and 2 refused to participate. The median age of the patients was 26 y (range 15-75) and 37 (46.2%) were males. The patients in the sequential arm had fewer cases of DIH (20% vs 42.5%; p=0.03). The patients in the sequential arm had lower in-hospital mortality (2.5% vs 17.5%; p=0.025) and better 6-month outcomes (25.0% vs 50.0%; p=0.02) compared with the standard arm.

CONCLUSIONS

Sequential ATT was associated with a lower frequency of DIH, lower in-hospital mortality and better 6-month outcome.

TRIAL REGISTRATION

Clinical Trials Registry of India (ctri.nic.in) identifier: REF/2016/09/012214/CTRI/2017/10/010072.

Feasibility and usefulness of tele-follow-up in the patients with tuberculous meningitis

Background

Tuberculous meningitis (TBM) is the most severe form of tuberculosis and these patients need close follow-up because of a high frequency of complications. The coronavirus disease 2019 pandemic and lockdown resulted in an interruption in physical follow-up. In this situation, tele-follow-up may be helpful. We report the feasibility and usefulness of a telephonic follow-up in patients with TBM.

Methods

Patients with TBM managed by us from January 2017 to March 2020 were included from the TBM registry. Their presenting symptoms, and clinical and investigation findings were noted. We contacted these patients telephonically and their clinical status was obtained using a questionnaire. Based on the telephonic information, outcomes were categorized as death, poor or good. Patients with the new medical problems were advised as to relevant investigations and the reports were obtained through WhatsApp for prescribing treatment.

Results

The telephone numbers of 103 of 144 (71.5%) patients were viable. Twenty-seven (26.2%) patients died, 15 (19.7%) had a poor outcome and 61 (80.2%) had a good outcome. Twenty-five (32.9%) patients had new medical problems: 18 TBM related and 7 TBM unrelated. The medical problems of 23 patients could be managed telephonically and only 3 (4%) patients needed a physical visit. Sixty-five (85.5%) patients happily answered the questionnaire and willing responders needed a treatment modification more frequently than the reluctant responders (p=0.008). Patients on active antitubercular treatment needed treatment modification more frequently (80% vs 21.3%).

Conclusions

Tele-follow-up is feasible in 96% of TBM patients and is beneficial, cost effective and overcomes the barrier of distance.