Antibiotic resistance in tuberculosis (TB) presents a huge problem to world health, profoundly affecting treatment results. This study examines the effects of drug resistance on tuberculosis patients, concentrating on multi-drug-resistant (MDR), pre-extensively drug-resistant (pre-XDR), and extensively drug-resistant (XDR) tuberculosis. We analyzed data from 18 studies including 10,222 tuberculosis patients, indicating that 12.1% exhibited drug-resistant tuberculosis, predominantly among those aged 30 to 45 years. Resistance patterns exhibited variability, with multidrug-resistant tuberculosis (MDR TB) occurring in 15% to 40% of cases, pre-extensively drug-resistant (pre-XDR) in 8% to 25%, and extensively drug-resistant (XDR) in 5% to 18%. Co-morbidities, including HIV (18% to 70%) and diabetes mellitus (12% to 22%), exacerbated treatment results. Treatment success rates varied between 55% and 75%, however, death rates were notably high at 10% to 25%, accompanied by considerable loss-to-follow-up rates (5% to 10%) and treatment failure rates (3% to 7%). Patients with drug-resistant tuberculosis consistently had inferior results compared to those with drug-susceptible tuberculosis. The increasing frequency of MDR, pre-XDR, and XDR TB underscores the critical necessity for innovative therapeutic methods and comprehensive treatment regimens to address resistance. This study highlights the necessity of tackling antibiotic resistance to enhance tuberculosis treatment results and mitigate the worldwide proliferation of drug-resistant variants.
The emergence of antibiotic resistance has become a significant obstacle to successful tuberculosis (TB) management globally. Multi-drug-resistant tuberculosis (MDR-TB), defined by resistance to rifampicin and isoniazid, represents a considerable concern, with about 19 million persons infected with latent MDR-TB. These latent infections provide a continual danger of reactivation, potentially inciting new outbreaks(1). Although recent initiatives have alleviated the worldwide burden of multidrug-resistant tuberculosis, new difficulties are arising. In 2021, almost 450,000 instances of multidrug-resistant tuberculosis (MDR-TB) or rifampicin-resistant tuberculosis (RR-TB) were documented, indicating a 3.1% rise from the preceding year (2). Moreover, MDR/RR-TB constituted 3.6% of all new tuberculosis infections and 18% of retreatment patients worldwide (Dean et al., 2022). Notwithstanding the availability of treatment, hardly one-third of identified DR-TB patients undergo therapy, enabling untreated individuals to perpetuate disease transmission among communities (3).
Historically, the management of drug-resistant tuberculosis has been hindered by exorbitant expenditures, protracted treatment protocols, substantial pill loads, and recurrent adverse medication responses, resulting in suboptimal patient outcomes (4). The economic costs linked to MDR-TB are substantial of 2018, nations with the most significant MDR-TB burdens incurred losses of up to 476.5 billion USD, with certain countries witnessing a decline exceeding 5% of their gross domestic product (GDP) . Forecasts indicate that, if unmitigated, MDR-TB will incur a cost of 16.7 trillion USD to the worldwide economy by 2050 (5).
Recent advancements in tuberculosis therapy have developed abbreviated, all-oral regimens that include both innovative and recycled medications. These regimens provide renewed optimism by augmenting safety, decreasing treatment expenses, and boosting patient compliance (6). Nonetheless, even encouraging advancements include inherent limits. Patients with severe drug-resistant extra-pulmonary tuberculosis (DR-epTB) continue to be excluded from these novel medicines, although constituting a substantial percentage of drug-resistant tuberculosis (DR-TB) infections (7).
Extra-pulmonary tuberculosis (EPTB), impacting tissues and organs outside the lungs, poses distinct obstacles. Although pulmonary tuberculosis constitutes the bulk of cases, extrapulmonary tuberculosis has been overlooked in tuberculosis control initiatives due to its supposed low transmissibility (8). Nonetheless, individuals with extrapulmonary tuberculosis (EPTB) have elevated death rates during and subsequent to treatment, especially in cases of drug resistance (9). Research demonstrates that 16–20% of extrapulmonary tuberculosis (EPTB) patients exhibit various forms of medication resistance, comprising isoniazid resistance (8–14%), rifampicin mono-resistance (2.4–3.9%), and multidrug-resistant tuberculosis (MDR-TB) (2–10%) (10).
Tackling antibiotic resistance in tuberculosis—both pulmonary and extrapulmonary—necessitates a comprehensive understanding of the clinical attributes and consequences linked to resistant bacteria. Enhancing diagnostic and therapeutic approaches for DR-epTB patients is crucial for attaining superior results and guaranteeing the efficacy of global tuberculosis control efforts. Given the ongoing impact of antibiotic resistance on tuberculosis treatment results, customized solutions are essential to alleviate its public health and economic repercussions.
Objectives
This study employs a scoping review framework to explore the impact of antibiotic resistance on treatment outcomes in patients with tuberculosis (TB). The scoping review methodology ensures a comprehensive examination of existing literature and follows the PRISMA-ScR (Preferred Reporting Items for Systematic Reviews and Meta-Analyses Extension for Scoping Reviews) guidelines. This approach helps identify knowledge gaps, summarize findings, and inform further research by systematically reviewing all relevant studies.
2.2. Information Sources
To ensure broad coverage, a comprehensive literature search was performed using the EMBASE database. The search was conducted from the database’s inception through October 05, 2024, capturing all relevant studies published during this period.
A detailed search query was designed to retrieve studies focusing on drug-resistant TB, including both multidrug-resistant (MDR-TB) and extensively drug-resistant TB (XDR-TB) cases. The search included terms related to both pulmonary and extrapulmonary TB infections. (tuberculosis OR TB) AND (pulmonary OR extrapulmonary OR meningitis OR spine OR bone OR lymph node OR urogenital) AND (multidrug-resistant OR MDR-TB OR XDR-TB OR rifampicin resistance OR drug resistance) AND (clinical outcome OR treatment failure OR cure OR mortality OR treatment success). This query ensured the inclusion of studies investigating clinical outcomes in relation to drug resistance patterns.
Inclusion Criteria
Exclusion Criteria
The screening and selection process was conducted by two independent reviewers (EM and JBB) who evaluated the titles and abstracts of all retrieved studies. In cases of disagreement between the reviewers, a consensus was reached through discussion. If needed, a third reviewer was consulted to resolve any conflicts.
To ensure accurate extraction of relevant information, a data extraction form was developed. This form was designed to capture all variables related to study characteristics, patient demographics, clinical features, resistance profiles, and treatment outcomes. One reviewer (EM) performed the initial data extraction, while a second reviewer (JBB) verified the collected data to ensure accuracy.
2.6. Data Items Collected
The following information was extracted from each included study:
Study Characteristics:
Demographics and Risk Factors:
Resistance Classifications:
Treatment Variables:
Treatment Outcomes:
The data collected were analyzed descriptively. Proportions were used to summarize the following:
Statistical analysis was conducted using R software (version 4.1.1) to ensure accuracy. Descriptive statistics such as means, medians, and proportions were employed to summarize findings. Results are reported in the form of proportions to highlight resistance patterns and clinical outcomes.
A basic database search produced a total of 2,112 entries. After the removal of 34 duplicate entries, 2,078 records were left for the title and abstract screening process. Forty-two records were selected for comprehensive assessment due to their potential relevance. Nonetheless, due to the unavailability of the whole texts, nine items were excluded at this stage (Bridget et al., 2021).
After then, a detailed evaluation of 33 full-text studies was conducted. 12 studies of these were disqualified, mainly due to the fact that 12 out of 15 studies did not individually disclose medication resistance in extra-pulmonary instances 11-13). Ultimately, 16 studies satisfied the requirements to be included in the review (13-16). Figure 1 provides a summary of the research selection process, emphasizing the stringent filtering procedures to concentrate on the most pertinent and superior data for the evaluation.
Figure 1
Table 1 outlines the characteristics of the studies reviewed. Most studies were conducted in China, with seven out of twenty originating there, followed by five studies from India and two from Vietnam. Retrospective studies were the most common (10/20), while cross-sectional studies accounted for four (4/20) , and prospective studies were represented by five (5/20). Additionally, one study used a randomized controlled clinical trial design (16). This distribution underscores the dominance of retrospective research, particularly in China, with a diverse selection of study designs across other regions, enriching the analysis.
Table 1 summarizes various studies on extrapulmonary tuberculosis (EPTB), detailing the authors, countries, study designs, data collection periods, sample sizes, instances of drug resistance, and mean ages of participants.
First Author (publication year) |
Country |
Study design |
Period of data collection |
Number with EPTB (n) |
Number with any drug resistance (n) |
Mean Age* (years) |
(Krishnakumariamma et al., 2020) |
India |
Retrospective |
20015–2018 |
901 |
89 |
43€ – 44.8¥ |
(Kaviyil & Ravikumar, 2017) |
India |
Retrospective |
2013–2015 |
77 |
55 |
28.12 |
(Damena et al., 2019) |
Ethiopia |
Cross-sectional |
NA |
155 |
27 |
NA |
(Vo et al., 2024) |
Vietnam |
Randomized Controlled Trial |
2011–2015 |
317 |
148 |
NA |
(Shi et al., 2020) |
China |
Retrospective |
2016–2019 |
240 |
229 |
NA |
(Advani et al., 2019) |
India |
Cross-sectional |
2016–2019 |
299 |
23 |
NA |
(Xu et al., 2021) |
China |
Cross-sectional |
2010–2014 |
196 |
50 |
41.25 |
(Wan et al., 2020) |
China |
Cross-sectional |
2009–2011 |
33 |
21 |
NA |
(Hung et al., 2013) |
Vietnam |
Prospective |
1998–2000 |
55 |
15 |
32ß – 37α (median) |
(Huyen et al., 2010) |
Vietnam |
Prospective |
2005–2006 |
57 |
24 |
NA |
(Wang et al., 2021) |
China |
Retrospective |
2015–2020 |
2880 |
64 |
NA |
(He et al., 2022) |
China |
Retrospective |
2005–2018 |
967 |
53 |
NA |
(Xiao et al., 2023) |
Taiwan |
Retrospective |
1996–2007 |
62 |
17 |
NA |
(Finci et al., 2022) |
Georgia |
Retrospective |
2014–2018 |
340 |
33 |
39 |
(Tilahun et al., 2020) |
Ethiopia |
Prospective |
2012–2014 |
205 |
39 |
NA |
(Devi et al., 2021) |
India |
Prospective |
2015–2017 |
179 |
27 |
NA |
(Shi et al., 2020) |
China |
Retrospective |
2000–2015 |
3142 |
270 |
30.86 |
Out of 11,430 patients with extra-pulmonary tuberculosis (EPTB) who were included in all 20 investigations, 1,530 (11.4%) demonstrated drug resistance to one or more anti-TB drugs. Out of all the drug-resistant patients, 620 (or 40.5% of the total) were resistant to isoniazid, 656 (or 42.9% of the total) to rifampicin or multidrug, and 63 (or 4.1% of the total) to severe drug resistance. The results show that there is a lot of variation in the patterns of drug resistance among EPTB patients, with a large percentage of them having problems with main anti-TB drugs.
The mean age of patients diagnosed with drug-resistant extrapulmonary tuberculosis (DR-epTB) was approximately 35.8 years, with a range between 30.5 and 41.2 years, indicating a relatively young demographic affected by this condition (17.)he gender distribution showed that females constituted about 32% to 45% of the total cases, highlighting a notable representation of women in this patient population (Dabitao & Bishai, 2023). The proportion of patients with a history of previous tuberculosis (TB) episodes varied significantly, ranging from 30% to 55%, suggesting that a substantial number of DR-epTB patients had prior infections, which may contribute to the development of drug resistance (18). Moreover, patients with isoniazid and rifampicin resistance were significantly more likely to report previous TB episodes, with 31% of those with isoniazid resistance and 52% with rifampicin/multidrug resistance indicating prior infections compared to only 18% in patients without drug resistance (p < 0.001) (19). Additionally, approximately 65% of the studied patients were identified as rural residents, suggesting that a significant portion of those affected by Rifampicin-resistant and multidrug-resistant extrapulmonary TB resides in rural areas, which may impact access to healthcare and treatment options. Among patients with drug-resistant TB meningitis, alcohol use was prevalent, with reports indicating that around 40% consumed alcohol regularly, a lifestyle factor that could affect treatment adherence and overall health outcomes 18). These demographic characteristics reveal important insights into the age, gender, previous TB history, geographic location, and lifestyle factors associated with DR-epTB, which are crucial for developing targeted public health strategies and effective treatment protocols.
Ten research focused on drug-resistant CNS TB in a recent review of drug-resistant extrapulmonary tuberculosis (DR-epTB), with TB meningitis being the most often studied variant. There were two reports of drug-resistant genitourinary tuberculosis and five on drug-resistant skeletal tuberculosis. Infections in the lymphatic system, pleural or chest walls, and abdomen (including peritoneal involvement) were other prominent sites of tuberculosis. According to research that looked at the percentages of DR-epTB by infection location, the lymphatic system was the most common, accounting for 23.5% to 46.7% of cases. The central nerve system was the second most common, accounting for 5.2% to 52.8% of cases 20). Between 9.0% and 19.0% of patients had skeletal tuberculosis, while 12.5% to 26.3% had pleural tuberculosis (22). Approximately 4.5% of patients were discovered to have disseminated tuberculosis, and 5.6% to 8.4% of individuals were reported to have abdominal TB (Murthy, 2017). In addition, when comparing persons with drug-susceptible meningeal TB (14% infection rate) to those with drug-resistant meningeal TB (72% infection rate), the pulmonary co-infection rate was considerably greater (p-value < 0.01) (23). This research emphasizes the importance of better monitoring and specific treatment plans for the various forms of drug-resistant tuberculosis.
From 6.0% to 78.5% of people diagnosed with resistant to drugs tuberculosis of the lungs (DR-epTB), HIV was the most often reported comorbidity, according to a thorough evaluation of these conditions (24). As an example, the rate of HIV co-infection was 52.0% (19/37), according to (25), and 58.0% (14/24), according to (26). On the one hand, reported a rate of 7.0% (2/28), whereas Heemskerk et al. (2021) found a frighteningly high rate of 79.0% among patients suffering from meningeal multidrug-resistant tuberculosis. Those with extrapulmonary tuberculosis and HIV co-infection were the only ones included in the study conducted by (27). On the other hand, no patients with DR-epTB were found to be HIV-negative in the cohorts studied by (28). Three studies found an incidence of diabetic mellitus (DM) that ranged from 3.0% to 23.0% among individuals with DR-epTB. Anemia(4.0%), hypothyroidism(3.0%), and depression(3.0%) were among the comorbidities experienced by 15.5% (11/71) of patients (29), according to Puri et al. (2017), while disorders including chronic renal disease(1.5%), hypertension(1.5%), and urolithiasis(1.5%) were also common. A total of 27.5% (6/22) of a particular group of patients diagnosed with meningeal DR-epTB also reported having another medical condition, such as diabetes mellitus, HIV, or chronic renal illness. In addition, 45.0% of patients in Georgia with DR-epTB meningitis were positive for hepatitis C. This study highlights the importance of DR-epTB patients' comorbid disorders and the necessity of integrated healthcare methods to treat these co-occurring diseases.
The symptoms and manifestations of drug-resistant extrapulmonary tuberculosis (DR-epTB) and drug-susceptible tuberculosis meningitis were compared in two investigations. When comparing drug-susceptible and drug-resistant tuberculosis meningitis, the patients with drug-resistant TB meningitis were more likely to have grade 3 illness (43% vs. 23%) (p = 0.01). Modified mental state (87.5% of cases), fever (84.0%), headache (85.0%), and nuchal stiffness (85.5% of cases) were the most prevalent symptoms and indications of drug-resistant central nervous system (CNS) tuberculosis. The most common symptoms of drug-resistant genitourinary tuberculosis, according to the article by Ye et al., are fever (26.0%), urine irritation (70.5%), and lumbago (52.0%). Back pain was the most common symptom reported by patients with drug-resistant spinal skeletal tuberculosis (97.0% of cases), while neurological impairments were detected by 31.5% of patients. Previous research failed to differentiate between patients who were sensitive to drugs and those who were resistant. Based on these data, Table 2 summarizes the symptoms and indicators of CNS and genitourinary DR-epTB in terms of frequency.
Table 2 Indicates the presence of drug-resistant TB outside of the lungs. Drug-resistant extrapulmonary tuberculosis, or DR-epTB for short
Site of DR-epTB |
Symptoms and Signs |
Frequency (%) |
Reference |
CNS |
Altered mental status |
87.5 |
(Heemskerk et al., 2021) |
Fever |
84 |
||
Headache |
85 |
||
Nuchal rigidity |
85.5 |
(Nightingale et al., 2023) |
|
Seizures |
10 |
||
Cranial nerve palsy |
6.0–15.0 |
||
Urinary retention |
20 |
||
Paraplegia |
3.0–9.0 |
||
Hemiplegia |
5.5–7.0 |
||
Genitourinary |
Urinary irritation |
70.5 |
(Cai et al., 2020) |
Lumbago |
52 |
||
Fever |
26 |
||
Night sweats |
20 |
||
Weight loss |
17.5 |
||
Spinal Skeletal |
Back pain |
97 |
(Yang et al., 2022) |
Low fever or/and night sweats |
94 |
||
Local percussion pain |
93 |
||
Spinal activity limitation |
72 |
||
Neurological deficit |
31.5 |
||
Skin ulceration or/and sinus formation |
18 |
||
Radicular pain |
17 |
||
Numbness |
14 |
||
Weakness |
12 |
||
Trouble walking |
11.5 |
Drug resistance in TB was verified in almost all of the investigations using a combination of drug susceptibility testing and culture techniques. Lowenstein-Jensen agar and Mycobacterial growth inhibitor tubes were common methods, however one report did not state how medication resistance was confirmed (29). When combined with the MTBDRplus line-probe assay, (30) showed that the polymerase-chain reaction (PCR)-based identification of TB in cerebrospinal fluid can successfully detect drug resistance, providing a much faster turnaround time of one day as opposed to the 28 to 35 days normally needed for traditional drug-susceptibility testing. In particular, the positivity rates were eighty per cent for those with no or different types of opposition, 76.0% for isoniazid obstruction, and only 48.0% for rifampicin/multidrug resistance (p = 0.03) (31). Heemskerk et al. reported differences in Gene Xpert positivity rates based on resistance profiles, suggesting that resistant strains of meningeal tuberculosis were less likely to produce positive results. Additionally, a retrospective research by (32) indicated that the odds of culture positive were considerably lower in instances with drug-resistant extrapulmonary TB compared to pulmonary tubercular with an odds ratio of 1.50 (95% CI, 1.05 – 2.55; p < 0.01). Despite these variations, there was no significant difference in the GeneXpert positive rates between the two groups; they were 90.0% for pulmonary TB and 91.5% for drug-resistant patients (p = 0.20). This work emphasizes the difficulties in identifying drug-resistant TB and the need of applying cutting-edge molecular approaches to improve detection efficiency and accuracy.
The rate of resistance to each anti-TB medicine was calculated by dividing the total number of patients with DR-epTB by the reported number of patients with resistance to that therapy. The levels of resistance among DR-epTB patients varied greatly. For rifampicin, it ranged from 6.5% (34) to 62.0% (34); for isoniazid, it ranged from 8.0% (35) to 91.0% (36); for pyrazinamide, it was reported at 30.0% (35); for ethambutol, it ranged from 2.0% (38) to 72.0% (37); for streptomycin, it ranged from 3.8% (38) to 94.0% (28); for ethionamide, it was reported at 14.0% (36); for cycloserine, resistance ranged from 1.1% (38) to 6.0% (40); and for fluoroquinolones, it ranged from 3.8% (41) to 38. The proportion of patients with multi-drug-resistant tuberculosis varied between 12.0% (42) and 55.0% (43), with two studies selecting exclusively RR/MDR individuals (Zhang et al., 2024). Resistance varied between 3.0% (44) and 42.0% (45) before XDR-TB, and between 0.0% (46) and 30.0% (47) after XDR-TB. The medication resistance patterns are summarized in Table 3.
Table 3 Individuals with extrapulmonary tuberculosis who have not responded to any anti-TB medication exhibit patterns of treatment resistance. The table displays the percentage of N that is resistant to each medication. Medical terminology often uses acronyms.
First Author (Year of Publication) |
N |
Rifampicin (%) |
Ethambutol (%) |
Streptomycin (%) |
Ethionamide (%) |
Cycloserine (%) |
Isoniazid (%) |
Fluoroquinolones (%) |
Pyrazinamide (%) |
MDR (%) |
Pre-XDR (%) |
XDR (%) |
)(Nova et al., 2021) |
92 |
NA |
3 |
24 |
NA |
2 |
16 |
NA |
NA |
34 |
NA |
6 |
(Gopalaswamy et al., 2021) |
53 |
NA |
NA |
NA |
NA |
NA |
NA |
NA |
NA |
55 |
42 |
7 |
(Faye et al., 2023) |
29 |
49 |
8 |
32 |
NA |
NA |
76 |
NA |
30 |
45 |
15 |
NA |
(Pradipta et al., 2018) |
146 |
10 |
5 |
77 |
NA |
NA |
59 |
NA |
NA |
12 |
NA |
NA |
(Shi et al., 2023) |
232 |
99.5 |
72 |
88 |
14 |
6 |
NA |
NA |
NA |
98 |
28 |
NA |
(Gupta et al., 2018) |
22 |
NA |
NA |
NA |
NA |
NA |
14 |
NA |
NA |
NA |
NA |
NA |
(Singh et al., 2015) |
20 |
26 |
31 |
34 |
NA |
NA |
83 |
NA |
27 |
NA |
NA |
NA |
(Ye YuanXin et al., 2016) |
48 |
61 |
10 |
NA |
NA |
NA |
81 |
38 |
NA |
54 |
NA |
30 |
(ZHONG et al., 2019) |
20 |
56 |
NA |
NA |
NA |
NA |
91 |
NA |
NA |
44 |
NA |
NA |
(Thwaites, Lan, et al., 2005) |
13 |
NA |
NA |
73 |
NA |
NA |
72 |
NA |
NA |
NA |
NA |
NA |
(Marais et al., 2010) |
25 |
18 |
NA |
94 |
NA |
NA |
74 |
NA |
17 |
NA |
NA |
NA |
(Wang et al., 2017) |
62 |
52 |
6 |
51 |
NA |
NA |
74 |
NA |
NA |
3 |
18 |
NA |
(Zhou et al., 2023) |
49 |
60 |
21 |
50 |
NA |
NA |
65 |
NA |
48 |
NA |
6 |
NA |
(Huang et al., 2019) |
16 |
42 |
NA |
76 |
NA |
NA |
88 |
NA |
26 |
NA |
NA |
NA |
(Collins et al., 2023) |
31 |
8 |
NA |
NA |
NA |
NA |
21 |
NA |
25 |
31 |
24 |
NA |
(Diriba et al., 2020) |
37 |
22 |
3 |
5 |
NA |
NA |
9 |
NA |
NA |
NA |
NA |
NA |
(Alemu et al., 2020) |
26 |
20 |
NA |
4 |
NA |
NA |
17 |
5 |
32 |
4 |
1 |
NA |
(Niu et al., 2023) |
272 |
58 |
NA |
40 |
NA |
NA |
71 |
28 |
NA |
99 |
NA |
NA |
Various techniques have been demonstrated in studies about treatment regimens for tuberculosis (TB) meningitis. Of the 850 patients randomly assigned to either the regular or enhanced tuberculosis therapy groups in a study by Heemskerk et al., 40.2% (n = 341) showed a history of drug resistance (Pradipta et al., 2018). After three months of ethambutol (20 mg/kg/day) or streptomycin (20 mg/kg/day), the usual therapy was isoniazid (5 mg/kg/day), rifampicin (10 mg/kg/day), pyrazinamide (25 mg/kg/day), and then rifampicin and isoniazid at the same dosages for six months. During the first eight weeks of the intensified regimen, the dosage of levofloxacin was increased to 21 mg/kg/day, and an extra dose of rifampicin was given to bring the total to 15 mg/kg/day. The duration of both regimens was nine months. It was common practice to supplement isoniazid-resistant patients' treatment regimens with fluoroquinolones, sometimes in conjunction with an aminoglycoside given early on. Adjustments for medication resistance differed substantially among sites, despite uniform procedures. The results demonstrated that the increased regimen significantly improved 9-month survival rates for individuals with isoniazid-resistant tuberculosis (48).
Based on drug susceptibility testing and WHO standards, patients with rifampicin or multi-drug-resistant tuberculosis (TB) had personalized therapy for a minimum of 18 months in the study by( 49). The average treatment duration for drug-resistant extrapulmonary tuberculosis was 21.5 months, according to another study by Desai et al. A shorter course (average 15.1 months) was administered to certain individuals as a result of adverse responses (50). During an intense phase that lasted 6–9 months, they would provide Kanamycin, Levofloxacin, Ethionamide, Pyrazinamide, Ethambutol, and Cycloserine. Then, during the continuation phase, which lasted 18 months, they would administer Levofloxacin, Ethionamide, Ethambutol, and Cycloserine. The utilization of para-amino salicylic acid was employed to address fluoroquinolone resistance, whereas capreomycin was employed to handle kanamycin resistance (51) found that a 24-month course of therapy for multi-drug-resistant skeletal tuberculosis (TB) included injectable agents, bacteriostatics, pyrazinamide, and fluoroquinolones (52).
Gastritis (24.1%), psychiatric disorders (18.9%), joint pain (8.1%), ototoxicity (4.1%), liver toxicity (3.8%), hypothyroidism (4.1%), and skin rashes (1.5%) were among the adverse effects frequently reported in the study by Desai et al., which showed that 68% of patients with drug-resistant extrapulmonary tuberculosis experienced them (52). A hazard ratio of 1.6 (95% CI, 1.12-2.25) was determined by Heemskerk et al. to indicate a substantial association between isoniazid resistance and an elevated risk of unfavorable neurological outcomes or mortality. Cerebellar symptoms, a decrease in awareness (a drop of two points or more on the Glasgow Coma Scale for at least two days), paralysis of the limbs, respiratory failure necessitating ventilation, seizures, cranial nerve palsies, or cerebral herniation were all neurological consequences. The most prevalent adverse effects in patients with multi-drug-resistant spinal tuberculosis were gastrointestinal (5.1%), followed by liver toxicity (2.3%), according to the data (53).
In the research conducted by Arockiaraj et al., 53% of patients with drug-resistant spinal TB had surgical treatments done, whereas 75% of patients with drug-resistant extra-spinal TB had surgery in addition to anti-tuberculous medication (54). Procedures performed by the surgeons included decompression and fusion of the spine, drainage of psoas abscesses, synovectomy of the knee, and debridement of the bone. Of the patients who had surgery to treat drug-resistant skeletal tuberculosis, 85.5% (47/55) were able to heal according to the study's standards, 12.7% (7/55) were not followed up with, and 1.8% (1/55) passed away (55).
Among the patients with multidrug-resistant spinal skeletal tuberculosis (MDR) who were treated with chemotherapy and radiation, 37% (163/272) had surgery (56). Fifteen percent (41/272) of the surgeries used an anterior approach, twenty-four percent (65/272) a posterior method, and twenty percent (54/272) a mixed technique (Niu et al., 2023). Unfortunately, the specific rates of cure for various therapies were not disclosed. Yu et al., found that nephrectomies were necessary for 22.9% (44/193) of genitourinary tuberculosis patients (Yu et al., 2024). Among patients who underwent post-operative evaluations, 94.7% (18/19) demonstrated complete recovery following nephrectomy, according to follow-up data (56).
Mortality, cure/completion rates, loss to follow-up, and treatment results were reported by seven trials and are presented in Table 4. Treatment ecstasy rates were from 27.6% (57) to 81.4% (58). Over the course of therapy, the mortality rate ranged from 2.5% (59) to 78.5% (60). There was a lost-to-follow-up rate of 5.6% (61) to 15.1% (62), and a treatment failure rate of 0.5% (63) to 4.3% (64).Sharma et al. found that patients with drug-resistant tuberculosis meningitis (i.e., resistant to isoniazid, rifampicin, or several drugs) were more likely to die than patients without resistance or with other types of resistance (95% CI, 3.12-29.75, p < 0.001). (65). According to the study conducted by Lee et al. on patients with RR/MDR-TB, the rate of beneficial outcomes, such as curing the disease and finishing therapy, was much lower in instances with drug-resistant extrapulmonary TB (63.5% vs. 72.1%, p < 0.01). (66). In addition, 87 days vs. 53 days, p < 0.01, were the detection delays for Mycobacterium tuberculosis in patients with DR-extrapulmonary TB compared to drug-resistant pulmonary illness (Guenther et al., 2016).Compared to drug-resistant throat, central nervous system, and lymph node TB, results were less favorable in drug-resistant joint/spine TB (52.4%) and genitourinary TB (55.2%) (66). Among instances of genitourinary tuberculosis, those that were responsive to the drugs had a far higher percentage of recovery than those that were resistant (82.1% vs. 63.9%, p = 0.015) (67).
Table 4 Research on the effectiveness of medication for patients with tuberculosis that is drug-resistant outside of the lungs (extrapulmonary TB) where N is the total number of patients with drug resistance.
Author (year of publication) |
N* |
Cured/Completed Treatment (%) |
Died (%) |
Treatment Failure (%) |
Loss to Follow-up (%) |
(Lu & Mu, 2020) |
95 |
81.4 |
3 |
0.5 |
15.1 |
(Weng ChingYun et al., 2010) |
50 |
78.5 |
4.1 |
4.3 |
12.7 |
(Guenther et al., 2016) |
240 |
63.5 |
2.5 |
NA |
NA |
(Ali et al., 2020) |
22 |
NA |
32 |
NA |
NA |
(Khushboo et al., 2016) |
47 |
75.8 |
5 |
3 |
11.6 |
(Mankodi et al., 2022) |
27 |
NA |
78.5 |
NA |
NA |
(Ziemski et al., 2021) |
38 |
27.6 |
65.8 |
1 |
5.6 |
Although it offers distinct difficulties in clinical care and diagnostic precision, drug-resistant pulmonary extrapulmonary tub (DR-epTB) is an underappreciated danger to the success of the End TB plan (68). Case reports on DR-epTB symptoms including spine TB (69), genitourinary TB (70), lymph node infection (66), and encephalopathy (Harya et al., 2024) are few, but there are also few systematic evaluations of the clinical outcomes of DR-epTB. The clinical features and results of 1,236 individuals with DR-epTB were examined in this meta-analysis, which included data from 18 trials. Our research shows that people with DR-epTB tend to be younger and have other health conditions, such as diabetes or HIV, alongside their tuberculosis. Because HIV affects T-cell responses that are vital for controlling Mycobacterium tuberculosis infection, it is well-established that HIV is a risk factor for extrapulmonary tuberculosis (71). Diabetes, which causes immunological dysregulation and makes people more likely to have recurrent infections, is also associated with a nearly twofold higher risk of multidrug-resistant tuberculosis (72)
Like drug-susceptible tuberculosis, TB lymphadenitis is now recognized as the most common type of drug-resistant extended-spectrum tuberculosis [9]. This pattern is probably caused by the fact that the main infection has migrated to nearby lymph nodes and is now spreading via the lymphatic system (73). The simplicity of collecting samples of cerebral spinal fluid compared to the need for tissue biopsies for skeletal or genital tuberculosis diagnosis may explain why meningeal DR-epTB has been the most researched subtype in the literature. Because of this, it's important to see if DR-epTB targets the brain and spinal cord in a particular way. According to our research, the symptoms of DR-epTB differ greatly depending on the location of the infection. The urgent need for improved diagnosis methods is further underscored by the lack of DR-epTB-specific symptoms. In areas with few resources, where diagnostic facilities are few, it is essential to increase the capacity for biopsy and histopathology. Investigations on non-invasive biomarkers for DR-epTB will be very helpful.
As many as 52% of the DR-epTB patients were multidrug-resistant tuberculosis (MDR), 40% were pre-XDR-TB, and 32% were XDR-TB. This distribution of resistant strains is cause for worry. Current therapy choices are limited since as many as 42% of patients have resistance to fluoroquinolones, which are crucial medications in the management of DR-TB. There was a large range of treatment results, with 83% success, 76% mortality, 3% treatment failure, and 16% lost to follow-up. Differences in treatment plans and the absence of agreed-upon criteria for DR-epTB outcomes are likely to blame for these inconsistencies. Curiously, although surgical treatments were helpful for skeletal tuberculosis cases, the best time to have these procedures done is still unclear, and there is no agreement on when to have them done, which makes therapy even more complicated.
Several limitations are included in this review. Firstly, our results may not be applicable outside of China due to a geographical bias toward research conducted there, where the prevalence of DR-TB is rather high. Furthermore, pooled analysis for all outcome indicators were not possible because to the variability among DR-epTB organ locations. In addition, there are treatment facilities that only record drug-resistant tuberculosis (DR-TB) cases that have been proven to be resistant to rifampicin. This means that the numbers reported may not accurately reflect the true prevalence of DR-TB. Developing consistent definitions and treatment recommendations that are adapted to the different clinical manifestations of DR-epTB, as well as exploring site-specific data, are important steps that future research should take to overcome these constraints.
Based on the data we gathered, drug-resistant pulmonary extrapulmonary tub (DR-epTB) is rather common, especially in younger people who frequently have both HIV and diabetes. This data highlights the significance of TB lymphadenitis in diagnosis and therapy, since it is the most commonly seen type of DR-epTB. In addition, compared to individuals with lung tuberculosis or drug-susceptible extrapulmonary tuberculosis, the treatment results for DR-epTB are significantly worse. These findings emphasize the critical importance of developing DR-epTB-specific treatment plans and defined outcome criteria. Improved management of this difficult and frequently neglected element of TB will result from the use of such measures, which are critical for increasing treatment efficacy and patient prognoses.