Geographic information system-based mapping of air pollution & emergency room visits of patients for acute respiratory symptoms in Delhi, India (March 2018-February 2019)

Background & objectives: Studies assessing the spatial and temporal association of ambient air pollution with emergency room visits of patients having acute respiratory symptoms in Delhi are lacking. Therefore, the present study explored the relationship between spatio-temporal variation of particulate matter (PM)2.5 concentrations and air quality index (AQI) with emergency room (ER) visits of patients having acute respiratory symptoms in Delhi using the geographic information system (GIS) approach. Methods: The daily number of ER visits of patients having acute respiratory symptoms (less than or equal to two weeks) was recorded from the ER of four hospitals of Delhi from March 2018 to February 2019. Daily outdoor PM2.5 concentrations and air quality index (AQI) were obtained from the Delhi Pollution Control Committee. Spatial distribution of patients with acute respiratory symptoms visiting ER, PM2.5 concentrations and AQI were mapped for three seasons of Delhi using ArcGIS software. Results: Of the 70,594 patients screened from ER, 18,063 eligible patients were enrolled in the study. Winter days had poor AQI compared to moderate and satisfactory AQI during summer and monsoon days, respectively. None of the days reported good AQI (<50). During winters, an increase in acute respiratory ER visits of patients was associated with higher PM2.5 concentrations in the highly polluted northwest region of Delhi. In contrast, a lower number of acute respiratory ER visits of patients were seen from the ‘moderately polluted’ south-west region of Delhi with relatively lower PM2.5 concentrations. Interpretation & conclusions: Acute respiratory ER visits of patients were related to regional PM2.5 concentrations and AQI that differed during the three seasons of Delhi. The present study providessupport for identifying the hotspots and implementation of focused, intensive decentralized strategies to control ambient air pollution in worst-affected areas, in addition to the general city-wise strategies.

Detection of multi-drug resistance & characterization of mutations in Mycobacterium tuberculosis isolates from North- Eastern States of India using GenoType MTBDRplus assay.

Background & objectives: information on drug resistance tuberculosis is sparse from North-East (N-E) States of Iindia. We undertook this study to detect multi-drug resistant tuberculosis (MDR-TB) among MDR-TB suspects, and common mutations among MDR-TB cases using GenoType MTBDRplus. Methods: All MDR suspect patients deposited sputum samples to peripheral designated microscopy centres (DMC) in North-East States. The district TB officers (DTOs) facilitated the transport of samples collected during January 2012 to August 2012 to our laboratory. The line probe assay to detect common mutations in the rpoB gene for rifampicin (RIiF) and katG and inhA genes for isoniazid (IiNH), respectively was performed on 339 samples or cultures. Results: A total of 553 sputum samples from MDR suspects were received of which, 181 (32.7%) isolates were found to be multi-drug resistant. Missing WT8 along with mutation in codon S531L was commonest pattern for rifampicin resistant isolates (65.1%) and missing WT along with mutations in codon S315T1 of katG gene was commonest pattern for isoniazid resistant isolates (86.2%). Average turn-around time for dispatch of LPA result to these sStates from cultures and samples was 23.4 and 5.2 days, respectively. Interpretations & conclusions: The MDR-TB among MDR-TB suspects in North-Eastern States of Iindia was found to be 32.7 per cent. The common mutations obtained for RIiF and IiNH in the region were mostly similar to those reported earlier.

Proportion of Hospitalization at a Respiratory Centre Under RNTCP.

Objective: To determine proportion of patients requiring hospitalization under RNCTP. Methodology:All area-patients registered for treatment under RNTCP at LRS Institute, New Delhi through 16 DOTS centre during the reference period (1st April 2006 to 31st Dec 2006) were listed and those patients requiring hospitalization (upto 31st Dec 2007) at LRS Institute were identified and interviewed by a single investigator using semi-structured proforma with certain inclusion and exclusion criteria’s. The data was entered into master sheet and analysis carried out using software statistical package by computing proportion (%) and chi-square test. Results: It was observed that there were 2,345 patients registered for treatment under RNTCP during the reference period, out of which, 4.22% (99) required hospitalization. The males outnumbered females in absolute numbers, however, gender related hospitalization was similar, 4.08% for males to 4.47% for females (p=0.647). Maximum case load (75.75%) was seen in economically productive age group (15-49 years). The proportion of hospitalization amongst 1- 14, 15-49, 50-60 and 61 years & above age group was 2.36%, 4.10%, 5.11% and 8.60% respectively (p=0.08); category II (7.61%) patient admissions was twice than category I (3.65%) patients (p<0.001). The proportion of hospitalization was 2.37% and 5.4% amongst patients with negative and positive sputum status respectively. Conclusion: The study was undertaken at a respiratory tertiary care centre in a metro city and within the study constraints it highlights disease severity, late presentation and minimum need for TB beds under prevailing socio-economic circumstances in the country.

Clinical profile and diagnosis of extra-pulmonary TB in HIV infected patients: Routine abdominal ultrasonography increases detection of abdominal tuberculosis.

Objective: To study the clinical profile and assess the utility of the procedures performed for the diagnosis of extra" pulmonary TB (EPTB) in HIV patients. Design: Prospective observational study of HIV patients suspected to have EPTB. Results: Two hundred and thirty HIV-infected patients were enrolled over 18 months. Of them, 87 cases had active TB, 60 (69%) of whom were of EPTB. Major presenting symptoms were fever (93.3%), weight loss (80%) and cough (61.6%). The most common site of active EPTB was the abdomen (70%), which could be detected due to routine use of abdominal ultrasonography, followed by CT scans in inconclusive cases. Peripheral lymph node (22% ), pleura (15%), CNS involvement (3%) and one case each of psoas abscess and mediastinal lymphadeopathy were the other extra-pulmonary sites seen. Diagnosis of peripheral lymph node and pleural TB was based on cytological and mycobacterial examinations. Direct smear examinations were positive for AFB in 11 of 24 samples and mycobacterial cultures were positive in five of 18 samples. The median CD4 ceH count in our HIV-EPTB cases was 126 cells/ml3 (IQR-79.5-205.75). There was no statistical difference in the baseline CD4 ceH counts in patients with PTB vs EPTB (p-0.70), single vs multiple extra-pulmonary site involvement (p-0.57), and AFB positive vs AFB negative EPTB cases (p-0.51). Conclusions: EPTB is the most common form of TB in HIV patients with low CD4 cell counts. Fever, weight loss and cough are common presenting symptoms of EPTB. Routine abdominal ultrasonography followed by an abdominal CT scan in inconclusive cases can significantly increase the detection of abdominal TB.

To Study the Extent of Delay in Diagnosis and Treatment under DOTS.

Present study was prospectively carried out at the 3 DOTS cum Microscopy Centres, associated with LRS Institute of Tuberculosis and Respiratory Disease. A pre-tested and pre-designed questionnaire was developed to study the objectives and the patients were interviewed with the questionnaire at beginning of treatment. Among the 311 patients who were included in the study , 158 patients consisted of different type of delay. In the study maximum delay was patient delay (43.08%) i.e. in DOTS maximum delay is due to patients reporting to the clinic after onset of symptoms. Diagnosis delay was found in only 7.34% cases, indicating that the diagnosis in DOTS is efficient. Treatment delay consisted of 22.5% among study among study population i.e. late initiation of treatment under DOTS is a major issue on which the system have to concentrate.

Clinical profile and treatment outcome of Tuberculous Lymphadenitis in children using DOTS strategy.

Background: Extra pulmonary TB (EPTB) including tuberculous lymphadenitis is becoming more common probably due to human immuno deficiency virus (HIV) co-infection. While children do experience a high TB related morbidity and mortality, management of TB in children is challenging. The present study was designed to study the treatment outcome of DOTS strategy for pediatric tuberculous lymphadenitis. Objective: To study the efficacy of DOTS strategy for pediatric lymphhnode tuberculosis. Methods: Retrospective analysis of 669 children of lymphnode tuberculosis treated with DOTS strategy over 9½ years. Results: Mean age was 9.8 years with significantly more girls (61.3%) than boys (38.7%) {c2=34.08, P< 0.001 (S)}. Most of the patients were in the age group of 11-14 years (48.0%) followed by 6-10 years(34.5%) and 0-5 years(17.5%) respectively. Cervical tuberculous lymphadenitis (88.2%) was the commonest form for all ages followed by axillary lymphadenitis in 3.3%. TB of other sites was seen in only 57 (8.5%) cases. Out of total 622 (93%) cases of lymphnode TB where fine needle aspiration and/ or excisional biopsy was done, it was positive (84.2%) and negative (15.6%) respectively for AFB/ cytology, while it could not be done in 47 patients due to inaccessible sites. Category I, II and III was started on 15.4%, 7.5% and 77.1% patients respectively. Overall, treatment completion rate was 94.9% and the default rate was 2.2% with a failure rate of 2.5%. Death rate was 0.3%. Conclusion: The study confirms the efficacy of DOTS strategy for pediatric TB lymphadenitis

Clinical profile and treatment outcome of Tubercular Pleurisy in pediatric age group using DOTS strategy.

A significant proportion of global tuberculosis (TB) caseload is contributed by children. Management of pediatric TB especially EPTB is challenging. The present study was designed to study demographic, clinical profile and treatment outcome of DOTS strategy for pediatric tubercular pleurisy. Aim: To study the efficacy of DOTS strategy. Methods: Retrospective analysis of 106 TB pleurisy children treated with DOTS Results: Mean age was 10.8 years (median age 12.2 years) with more females (51.9%) than males (48.1%)c1 2=0.15; P= 0.698 (NS). In the age group of 0-5, 6-10 and 11-14 years, there were 15.1%, 30.2% and 54.7% patients respectively. Fever was the commonest symptom (98.1%) followed by cough (77.4%) and chest pain (55.7%). History of contact could be elicited only in 2/3rd of cases unilateral effusion (61.3%) was commonest, followed by empyema (22.6%), massive effusion and broncho-pleural fistula each in 13.2% cases respectively. Bilateral effusion was seen in 3.8% cases only. Conventional methods (mantoux, radiograph, ultrasound, pleural aspiration) and minimal invasive surgical techniques, percutaneous pleural biopsy were done to arrive at the diagnosis. Diagnosis was made by X-ray Chest in 92.5%, exudative pleural fluid (100%) predominantly lymphocytic in 85.8%, positive AFB smear and culture in 4.7 and 5.7% cases respectively. Category I, II and III was started on 35.9%, 2.8% and 61.3% patients respectively. Overall treatment completion rate was 94.3%, 4.7% default rate, 0.9% failure rate and no deaths. Conclusion: The study confirms early detection by simple tests and ensuring complete treatment using DOTS strategy.

Influence of pre-treatment bacillary load on treatment outcome of pulmonary tuberculosis patients receiving DOTS under revised national tuberculosis control programme.

OBJECTIVE: To study the influence of initial bacillary load on sputum conversion rates and treatment outcome of new smear positive pulmonary tuberculosis patients. METHODS: A retrospective study was done among 2938 new smear positive pulmonary tuberculosis patients, registered at the peripheral centres, covering a population of 1.6 million in Delhi, India. The patients pre-treatment sputum smears were graded as 1+, 2+ or 3+ based on three samples. Patients were given intermittent short-course chemotherapy under supervision and the treatment outcome was analysed. RESULTS: Sputum conversion rates among patients graded as sputum 3+ and rest of the patients (combined graded sputum 1+ and 2+) at the end of two months were 62.2% and 76.8% respectively (p<0.001), and at the end of three months were 81.3% and 89.5% respectively (p<0.001). Cure rates among same group of patients were 76.6% and 85.1% respectively (p<0.001), and failure rates were 7.7% and 4.5% respectively (p<0.001). CONCLUSIONS: Under field conditions even with directly observed treatment (DOT) new smear positive patients with heavy bacillary load showed statistically significant poor sputum conversion rates at two and three months and higher failure rates as compared to patients with lesser bacillary load. To investigate possible reasons for this poor response and possible solutions further studies are needed.