Front. Microbiol. Frontiers in Microbiology Front. Microbiol. 1664-302X Frontiers Media S.A. 10.3389/fmicb.2024.1477836 Microbiology Systematic Review Prevalence of colistin resistance in clinical isolates of Pseudomonas aeruginosa: a systematic review and meta-analysis Narimisa Negar 1 2 Keshtkar Abbasali 3 Dadgar-Zankbar Leila 2 Bostanghadiri Narjess 1 2 Far Yasaman Rouein 4 Shahroodian Soheila 2 Zahedi Bialvaei Abed 1 * Razavi Shabnam 1 2 * 1Microbial Biotechnology Research Center, Iran University of Medical Sciences, Tehran, Iran 2Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran 3Department of Disaster and Emergency Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran 4Institute for Chemistry and Biology of the Marine Environment (ICBM), School of Mathematics and Science, Carl von Ossietzky Universität Oldenburg Ammerländer Heerstraße, Oldenburg, Germany

Edited by: Asad U. Khan, Aligarh Muslim University, India

Reviewed by: Salome N. Seiffert, Zentrum für Labormedizin (ZLM), Switzerland

Ahmed S. Khairalla, University of Regina, Canada

 *Correspondence: Shabnam Razavi, razavi.sh@iums.ac.ir; Abed Zahedi Bialvaei, zahedi.ab@iums.ac.ir 09 10 2024 2024 15 1477836 08 08 2024 18 09 2024 Copyright © 2024 Narimisa, Keshtkar, Dadgar-Zankbar, Bostanghadiri, Far, Shahroodian, Zahedi Bialvaei and Razavi. 2024 Narimisa, Keshtkar, Dadgar-Zankbar, Bostanghadiri, Far, Shahroodian, Zahedi Bialvaei and Razavi

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 Objective

The emergence of resistance to colistin, the last resort for treating severe infections caused by Pseudomonas aeruginosa, poses a significant threat to public health. This meta-analysis aimed to investigate the prevalence of colistin resistance in clinical isolates of P. aeruginosa.

 Method

A comprehensive search of MEDLINE (PubMed), Web of Science, and Scopus databases was conducted to identify relevant articles published until December 2023. Subsequently, a meta-analysis was performed using Stata software to examine the pooled prevalence of colistin resistance and to conduct subgroup analyses.

 Results

A total of 619 studies were included in the meta-analysis, revealing a global prevalence of colistin resistance of 1% among all P. aeruginosa isolates. Furthermore, cystic fibrosis patients exhibited the highest resistance to colistin, with a prevalence of 7% among the examined diseases.

 Conclusion

The increase in colistin resistance in P. aeruginosa in recent years from 2% (in the period of 2006–2010) to 5% (in the period of 2020–2023) underscores the need for implementing infection prevention programs, using appropriate treatment regimens, and disseminating comprehensive information on antimicrobial resistance patterns. These measures are crucial for addressing this growing public health concern.

 Pseudomonas aeruginosa cystic fibrosis infection prevention treatment regimens public health section-at-acceptance Antimicrobials, Resistance and Chemotherapy Introduction

Pseudomonas aeruginosa is recognized as an opportunistic pathogen and a major causative agent of hospital-acquired infections, including urinary tract infections, pneumonia, bloodstream infections, and surgical site infections (Pang et al., 2019; Sadikot et al., 2005). The development of intrinsic and acquired resistance in P. aeruginosa is attributed to the inappropriate and excessive use of antibiotics, leading to the emergence of antibiotic resistance (El-Mokhtar and Hetta, 2018).

The management of P. aeruginosa infections has always presented challenges. Carbapenems such as imipenem and meropenem were introduced as effective treatments for severe multidrug-resistant (MDR) P. aeruginosa infections. However, the overuse of antibiotics has resulted in the emergence of carbapenem-resistant isolates, posing a significant concern (Wi et al., 2017; Bonyadi et al., 2022). In 2017, the World Health Organization (WHO) identified carbapenem-resistant P. aeruginosa as a priority pathogen necessitating the development of new antibiotics for treatment (Tacconelli et al., 2018).

The increasing rate of infections caused by multidrug-resistant (MDR), extensively drug-resistant (XDR), and particularly carbapenem-resistant P. aeruginosa has led to the resurgence of colistin as a critical last-resort therapeutic option (Wi et al., 2017; Biswas et al., 2012; Al-Orphaly et al., 2021). Despite its potent antimicrobial activity against P. aeruginosa and its designation as a potentially effective drug, the increased utilization of colistin has resulted in the emergence of bacterial strains with reduced susceptibility to this antibiotic class worldwide (Pechorsky et al., 2009; Lee et al., 2012).

Colistin resistance primarily arises through various mechanisms, including enzymatic modification of lipid A, leading to a decrease in the outer membrane’s negative charge and reduced colistin affinity. Resistance to colistin may also stem from chromosomally encoded mutations or plasmid-mediated colistin resistance gene mcr, facilitating horizontal dissemination of resistance (Cannatelli et al., 2013; Paterson and Harris, 2016; Hasman et al., 2015; Arcilla et al., 2016). The prevalence of colistin resistance is typically below 10%, but this rate is steadily increasing in the Mediterranean, Southeast Asia, and certain African countries (Bialvaei and Samadi, 2015). Recent observations indicate that resistance to colistin has emerged in several Enterobacteriaceae species, including Klebsiella pneumoniae, Escherichia coli, and Enterobacter aerogenes. This resistance has been linked to the extensive use of polymyxins for infection control in veterinary medicine (Baron et al., 2016; Al-Kadmy et al., 2020). Given the potential for both horizontal transfer of resistance genes through conjugative plasmids and vertical transfer through chromosomal mutation, the emergence of colistin-resistant isolates poses a significant global health threat, especially considering the importance of colistin as a last-resort treatment option (Liu et al., 2016; Abd El-Baky et al., 2020).

The rise of MDR, XDR, and pan drug-resistant (PDR) P. aeruginosa poses a significant public health challenge, leading to delays in antimicrobial therapy, treatment failures, and increased mortality rates (Abd El-Baky et al., 2020). This situation necessitates urgent attention, as these resistant strains may exhibit resistance to all available antimicrobials or show susceptibility only to colistin or polymyxins, severely limiting treatment options for healthcare providers managing severe infections associated with MDR P. aeruginosa. The emergence of colistin-resistant strains is particularly concerning for patients with critical infections. Consequently, this systematic review and meta-analysis aims to investigate the global prevalence of colistin resistance in P. aeruginosa, thereby enhancing our understanding of antibiotic resistance in this pathogen.

 Methods Search strategy

We conducted a comprehensive search for eligible studies published from 1990 to December 2023 using MEDLINE (PubMed), Web of Science, and Scopus. The search terms included (“Pseudomonas aeruginosa” OR P. aeruginosa) AND (Colisticin OR “Polymyxin E” OR Colimycin OR colistin OR colistimethate). This review was carried out and reported in accordance with current guidelines, and the results were reported following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement (Moher et al., 2009).

 Inclusion and exclusion criteria

All original articles that provided data on the total number of clinical P. aeruginosa isolates and the number of colistin-resistant P. aeruginosa isolates were included. Studies were excluded if they met the following criteria: (Pang et al., 2019) did not present P. aeruginosa colistin resistance; (Sadikot et al., 2005) did not clearly report resistance rates (the exact number of primary isolates and the number of resistant isolates are not provided); (El-Mokhtar and Hetta, 2018) conducted antimicrobial susceptibility tests for colistin without specifying the method; (Wi et al., 2017) were written in languages other than English; and (Bonyadi et al., 2022) sourced data from conference abstracts, editorials, case reports, meta-analyses, systematic reviews, narrative reviews, experimental studies on animal models, and articles without full text after contacting the corresponding author.

 Data extraction

After consolidating the articles using EndNote X20 Citation Manager Software, duplicate articles were removed before review. The citations were then imported into Rayyan, a citation classification application (Ouzzani et al., 2016). Three reviewers independently screened all titles and abstracts to exclude irrelevant topics. In the subsequent assessment stage, qualified studies were downloaded, and the full text of selected articles was retrieved based on the inclusion and exclusion criteria.

Three reviewers developed a data extraction form and collected data from all qualified studies. The extracted data included the first author’s name, year of publication, year of collection, continent and countries where the study was conducted, sample size (number of P. aeruginosa isolates and number of colistin-resistant isolates), origin of isolates, drug resistance categories, disease, guideline, and susceptibility test methodology (agar dilution, broth microdilution, disk elution, E-test, and disk diffusion).

 Quality assessment

The quality of the included studies was evaluated independently by three reviewers using a modified version of the Joanna Briggs Institute (JBI) assessment tool for prevalence studies (Munn et al., 2014). The checklist includes the following questions: Was the sample frame appropriate to address the target population? Were study participants sampled appropriately? Was the sample size adequate? Were the study subjects and the setting described in detail? Was the data analysis conducted with sufficient coverage of the identified sample? Were valid methods used for the identification of the condition? Was the condition measured in a standard, reliable way for all participants? Was there an appropriate statistical analysis? Was the response rate adequate, and if not, was the low response rate managed appropriately? Each item is evaluated as “yes,” “no,” or “unclear.” A “yes” response is assigned a score of 1 point, while responses categorized as “no” or “unclear” receive 0 points. Studies that score 7 or higher are classified as high quality, those with scores between 5 and 6 are considered medium quality, and studies scoring 4 or lower are designated as low quality. In cases of disagreement, a fourth reviewer provided adjudication.

 Statistical analysis

We conducted a prevalence meta-analysis using the metaprop package in Stata 17 software. We calculated the pooled prevalence of colistin-resistant P. aeruginosa, along with the associated 95% confidence intervals (CIs), utilizing the Freeman-Tukey double arcsine transformation within a random-effects model.

To identify publication bias, we employed Egger’s test, with a significance threshold set at p < 0.05, indicating the presence of statistically significant bias. Additionally, a trim-and-fill analysis was conducted to address potential bias. Funnel plots were also utilized for a visual assessment of publication bias.

Heterogeneity among studies was measured using the I2 statistic. Specifically, I2 ≤ 25% indicated low heterogeneity, 25% < I2 ≤ 75% indicated moderate heterogeneity, and I2 > 75% indicated high heterogeneity.

Subgroup analyses were conducted based on various factors, including publication year (from 2009 to 2023), collection period (five distinct periods), continent (five continents), country (thirty-two countries), guidelines followed (CLSI and EUCAST), disease type (including Urinary Tract Infections, Pneumonia, Lower Respiratory Tract Infections, Intra-abdominal Infection, COVID-19, cancer, Cystic Fibrosis, Bacteremia, and Bloodstream Infection), method of colistin resistance detection (agar dilution, E-test, disk diffusion, and broth microdilution), different resistance categories (Multidrug Resistance, Extensively Drug Resistant, and Carbapenem Resistance), and sample origin (urine, sputum, endotracheal aspirate, burn wounds, and blood).

 Results Studies selection

Our initial search yielded a total of 9,378 articles. After removing duplicates, we screened the titles and abstracts of 7,561 articles. From this screening process, 1,076 articles met the inclusion criteria and were selected for a full-text review. After the full-text review, we identified 619 articles that were suitable for analysis (Abavisani et al., 2021; Abd El-Baky et al., 2020; Abdelatti et al., 2023; Abed and Kareem, 2021; Abubakar et al., 2022; Abulzahra and Ismail, 2020; Addis et al., 2021; Agrawal et al., 2013; Aguilar-Rodea et al., 2017; Ahani Azari and Fozouni, 2020; Ahmed et al., 2022; Ahmed et al., 2019; Aiyegoro et al., 2007; Akgül et al., 2021; Akhi et al., 2015; Akram et al., 2022; Al Dawodeyah et al., 2018; Al-Agamy et al., 2012; Al-Bayssari et al., 2021; Al-Kabsi et al., 2011; Al-kaffas et al., 2022; Al-Khudhairy and Al-Shammari, 2020; Al-shimmary, 2018; Al-Zahrani and Al-Ahmadi, 2021; Alam et al., 2021; Alcántar-Curiel et al., 2023; Alexopoulou et al., 2016; Alfouzan et al., 2022; Alfouzan et al., 2018; Alhanout et al., 2009; Ali et al., 2021; Ali et al., 2015; Alkhulaifi and Mohammed, 2023; Alotaibi et al., 2023; Alruways, 2023; Amabile-Cuevas, 2017; Appalaraju et al., 2020; Aprile et al., 2019; Arab et al., 2023; Araújo Lima et al., 2020; Arca-Suárez et al., 2021; Arici et al., 2023; Arif et al., 2022; Armengol et al., 2020; Armengol et al., 2019; Aruhomukama et al., 2019; Asar et al., 2019; Aydemir et al., 2022; Aydın et al., 2018; Azimi et al., 2012; Azimi L. et al., 2016; Azimi S. et al., 2016; Babu and Menon, 2018; Badawy et al., 2023; Badierah et al., 2019; Bae and Stone, 2022; Baek et al., 2020; Bagheri-Nesami et al., 2017; Bahabri et al., 2022; Bahador et al., 2019; Bahçe et al., 2022; Baiomy et al., 2023; Bakht et al., 2022; Balkhair et al., 2023; Bandic-Pavlovic et al., 2020; Banerjee et al., 2024; Bangera et al., 2016; Basu et al., 2013; Bayram et al., 2013; Bazgir et al., 2021; Beirao et al., 2020; Ben Nejma et al., 2018; Berwal et al., 2020; Bian et al., 2022; Blondeau et al., 2023; Bogiel et al., 2022; Bono et al., 2015; Bourgi et al., 2020; Boustanshenas et al., 2023; Brauncajs et al., 2022; Brzozowski et al., 2020; Bunsow et al., 2020; Buzilă et al., 2021; Cabot et al., 2011; Camargo et al., 2023; Candel et al., 2022; Canton et al., 2022; Carvalhaes et al., 2020; Castanheira et al., 2018; Cavallo et al., 2022; Cesur et al., 2012; Çetin et al., 2022; Chang et al., 2023; Chaturvedi et al., 2021; Chaudhary et al., 2020; Chauhan et al., 2022; Chen et al., 2022; Chen et al., 2015; Chen et al., 2023; Chen Q. et al., 2020; Chen X. et al., 2020; Chen et al., 2014; Chew et al., 2019; Chittawatanarat et al., 2014; Chukamnerd et al., 2023; Cillóniz et al., 2016; Cipriano et al., 2007; Çopur Çiçek et al., 2021; Czekajło-Kołodziej et al., 2006; da Costa Júnior et al., 2020; Dadmanesh et al., 2014; Darji and Patel, 2023; Dassner et al., 2017; Datar et al., 2021; de Dios et al., 2016; De Francesco et al., 2013; de Oliveira Santos et al., 2019; De Vecchi et al., 2013; Dehbashi et al., 2018; Del Barrio-Tofino et al., 2017; Del Giacomo et al., 2022; Delgado-Valverde et al., 2020; Delroshan et al., 2023; Depka et al., 2020; Descours et al., 2018; Dharati et al., 2021; Di Carlo et al., 2021; Di Domenico et al., 2017; 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A total of 262 articles investigated colistin resistance in P. aeruginosa using the microbroth dilution method, while 242 articles employed methods other than microbroth dilution. Additionally, 115 articles examined colistin resistance in multidrug-resistant (MDR), extensively drug-resistant (XDR), and carbapenem-resistant (CR) bacteria.

We followed the PRISMA guidelines and presented the article selection process in a flow diagram (Figure 1). Supplementary Table S1 provides a summary of the characteristics and quality assessment of all included studies. Additionally, references to the included studies can be found in Supplementary File 2.

The study PRISMA flow diagram.

 Meta-analysis results

For our meta-analysis, we focused on studies that utilized standard methods such as the broth microdilution and disk elution, which is recommended by the Clinical and Laboratory Standards Institute (CLSI) and the European Committee on Antimicrobial Susceptibility Testing (EUCAST) guidelines for evaluating resistance rates. Out of the total articles reviewed, 262 articles investigated colistin resistance in P. aeruginosa isolates using the microbroth dilution method. The pooled prevalence of colistin resistance among clinical P. aeruginosa isolates was estimated to be 1% (95% CI: 1–2%; I2 = 97.47%; p < 0.001).

To assess publication bias, we examined a funnel plot (Figure 2) and conducted Egger’s tests, which yielded a p-value of 0.053, indicating no evidence of publication bias. Additionally, the results following the Trim-and-Fill adjustment indicated that the prevalence of colistin resistance remained unchanged.

Funnel plot of the prevalence of colistin-resistant P. aeruginosa isolates.

 Subgroup meta-analysis

Subgroup meta-analyses were conducted based on various factors, including the year of publication, period of sample collection, continent, country, guideline used, disease assessed, origin of samples, different resistance categories, and methods.

Subgroup meta-analyses based on continents indicated that Africa exhibited the highest resistance rate at 4% (95% CI: 0–13%) (p < 0.001) (Figure 3). The studies encompassed 32 countries, with Egypt 15% (95% CI: 5–29%), and Pakistan 13% (95% CI: 9–17%) had the highest resistance (p < 0.001) (Figure 4).

Subgroup analysis for continents of colistin-resistant P. aeruginosa isolates.

Subgroup analysis for countries of the colistin-resistant P. aeruginosa isolates.

Regarding the subgroup meta-analyses based on the year of article publication, the rate of P. aeruginosa resistance to colistin has increased from 2% (95% CI: 0–11%) in 2009 to 3% (95% CI: 2–5%) in 2023, representing a 1% increase (p < 0.001) (Figure 5).

Subgroup analysis for year of publication of the colistin-resistant P. aeruginosa isolates.

When the sample collection time was divided into five periods, the subgroup meta-analyses revealed an increase in resistance over time from 2% (95% CI: 0–5%) to 5% (95% CI: 0–10%), from 2010–2006 to 2020–2023 (p = 0.005) (Figure 6).

Subgroup analysis for period of sample collection of the colistin-resistant P. aeruginosa isolates.

Subgroup analysis based on guidelines demonstrated that the CLSI group had a higher resistance level at 2% (95% CI: 1–2%) compared to 1% (95% CI: 1–2%) in the EUCAST group (p = 0.280) (Figure 7).

Subgroup meta-analysis for guidelines of colistin-resistant P. aeruginosa isolates.

Regarding the origin of samples, sputum samples exhibited the highest resistance at 4% (95% CI: 0–15%), whereas burn wound samples showed the lowest at 0% (95% CI: 0–1%) (p = 0.036) (Figure 8).

Subgroup analysis for origin of samples of colistin-resistant P. aeruginosa isolates.

Subgroup analysis based on disease type showed that patients with cystic fibrosis and lower respiratory infection had the highest resistance with rates of 7% (95% CI: 13–3%) and 5% (95% CI: 1–12%) respectively (p < 0.001) (Figure 9).

Subgroup analysis for infection of colistin-resistant P. aeruginosa isolates.

Among the methodologies used, 22 articles employed the agar dilution method, 28 used the E-test method, 192 utilized the disk diffusion method, and 262 opted for the broth microdilution method. The analysis indicated the highest resistance level with the agar dilution method at 6% (95% CI: 2–12%), while the broth microdilution method showed the lowest at 1% (95% CI: 1–2%) (p < 0.001) (Figure 10).

Subgroup meta-analysis for AST methods of colistin-resistant P. aeruginosa isolates.

When exploring colistin resistance in isolates with different resistance categories, findings based on the broth microdilution and disk elution method revealed that Extensively Drug-Resistant (XDR) isolates displayed a resistance rate of 11% (95% CI: 0–35%), Multidrug-resistant (MDR) isolates displayed a resistance rate of 8% (95% CI: 3–5%), and Carbapenem-Resistant (CR) isolates displayed a resistance rate of 4% (95% CI: 2–6%) (p = 0.068) (Figure 11).

Subgroup meta-analysis for different resistance categories of colistin-resistant P. aeruginosa isolates.

 Discussion

Antimicrobial resistance poses a significant threat to public health, leading to increased treatment expenses, prolonged hospital stays, and higher mortality rates. Currently, the rise in antibiotic resistance is particularly concerning in Enterobacteriaceae family members and the hospital bacterium P. aeruginosa (Talebi Bezmin Abadi et al., 2019). Additionally, the inappropriate and excessive use of antibiotics in medical and veterinary settings has contributed to the emergence of resistant strains.

P. aeruginosa exhibits various intrinsic and acquired antimicrobial resistance mechanisms, including AmpC cephalosporinases, diverse carbapenemases, and multidrug efflux pumps, resulting in resistance to a wide range of antimicrobial agents (Pang et al., 2019). The emergence and dissemination of MDR and XDR strains of P. aeruginosa, coupled with the limited availability of effective antimicrobial agents against these bacteria, have severely restricted treatment options (del Barrio-Tofiño et al., 2020; Willmann et al., 2015). Numerous studies have indicated that P. aeruginosa is resistant to most beta-lactam antibiotics, quinolones, and aminoglycosides (Pachori et al., 2019). Although carbapenems have been considered one of the primary treatment choices for P. aeruginosa infections, increasing resistance to this antibiotic has imposed limitations on its use (Pang et al., 2019; Balkhair et al., 2019). Despite colistin and tigecycline being commonly viewed as the only available antimicrobial agents for treating XDR P. aeruginosa infections, some strains have developed resistance to these last-line treatment options (Pang et al., 2019; Ibrahim et al., 2021; Cai et al., 2012). The widespread use of colistin has created conditions conducive to the emergence of resistant strains (Bialvaei and Samadi, 2015). The objective of this meta-analysis was to investigate the global prevalence of colistin resistance in P. aeruginosa isolates.

Our findings revealed that the estimated overall prevalence of colistin resistance in clinical isolates of P. aeruginosa was 1%. Several other meta-analyses have examined colistin resistance in different Gram-negative bacteria, finding rates of 6.9% in Iran for Klebsiella pneumoniae (Narimisa et al., 2022) and 4% in Acinetobacter baumannii (Bostanghadiri et al., 2024). While the level of colistin resistance in P. aeruginosa has been lower than in other Gram-negative bacteria, our analysis indicates that this resistance has been increasing in recent years. The recent rise in colistin resistance among P. aeruginosa can be attributed to multiple factors, particularly the overuse and misuse of antibiotics in both clinical and agricultural contexts, which have intensified selective pressure on bacterial populations (Hassen et al., 2022). Colistin, recognized as a last-resort antibiotic for multidrug-resistant infections, has seen increased utilization due to the emergence of resistant pathogens (Sharma et al., 2022), especially during the COVID-19 pandemic. As healthcare systems faced a surge in respiratory infections, colistin was often employed as a last-resort treatment, further heightening selective pressure on bacteria (de Blasio, 2021). This surge in usage, frequently driven by empirical treatment strategies amid uncertainty, has facilitated the emergence and spread of resistant strains (Ghosh et al., 2021). Additionally, the pandemic disrupted routine healthcare practices and antibiotic stewardship programs, creating an environment conducive to the development of resistance (Campbell et al., 2023). The implications of this growing resistance are significant, complicating treatment options for infections caused by multidrug-resistant organisms and presenting considerable challenges for public health.

Our analysis revealed that the highest rates of colistin resistance were observed in Egypt (15%) and Pakistan (13%). The implementation of effective management strategies is essential for the appropriate use of this antibiotic in these regions. This issue may be attributed to the lack of adequate diagnostic tools, as patient management often relies heavily on drug prescriptions, particularly antibiotics, in developing countries. Additionally, the availability of substandard antibiotics sold over the counter further exacerbates the problem, contributing to the rising rates of antimicrobial resistance in these areas (Dadgostar, 2019; Chaw et al., 2018; Chokshi et al., 2019).

Having a comprehensive standard protocol for determining antibiotic sensitivity is critical for several antibiotics. The CLSI recommends utilizing broth microdilution, colistin broth disc elution (CBDE), and the colistin agar test (CAT) for antimicrobial susceptibility testing against colistin. Additionally, the European Committee on Antimicrobial Susceptibility Testing (EUCAST) also advocates for broth microdilution as the preferred method for evaluating susceptibility to colistin (Pancholi et al., 2018; Özhak et al., 2019). The disk diffusion method, a widely employed and cost-effective approach in clinical microbiology laboratories, particularly in developing countries, lacks a standardized protocol for colistin sensitivity testing (Waites et al., 2011). In a study by Irene Galani and colleagues in Greece, two phenotypic methods, E-test and disk diffusion, were compared for measuring colistin resistance in Gram-negative bacilli. The researchers concluded that the disk diffusion method is not suitable or reliable for assessing antimicrobial sensitivity to colistin (Galani et al., 2008). Despite this, numerous articles have utilized non-endorsed methods, such as disk diffusion, to assess resistance. A subgroup meta-analysis focusing on measurement methods consistently found higher resistance rates when alternative methods were used, compared to the standard method. This discrepancy may be attributed to the lack of sensitivity in other methods for detecting and distinguishing resistant strains. Therefore, adherence to established standard guidelines for measurement methods is imperative.

The findings of our study revealed that P. aeruginosa isolated from respiratory samples, particularly in patients with respiratory infections such as cystic fibrosis, exhibited the highest level of resistance to colistin. In a meta-analysis conducted by Bonyadi et al. (2022), the resistance rate of P. aeruginosa isolates from cystic fibrosis patients to colistin was reported as 5%. However, our study demonstrated a resistance rate of 7%, suggesting a potential increase in resistance over the past two years. Notably, our subgroup meta-analysis focused solely on studies where resistance rates were confirmed by established guidelines, which may account for the variance in resistance percentages among cystic fibrosis patients.

Given the challenges in discovering new antibiotics, optimizing the use of existing treatments is crucial. Colistin is considered the last resort for treating extensively drug-resistant (XDR) Gram-negative bacteria (Ozsurekci et al., 2016). To address the increasing rates of antibiotic resistance, it is vital to implement innovative strategies. For instance, the combination of colistin and other antibiotics has demonstrated a synergistic effect against antibiotic-resistant Gram-negative pathogens, potentially curtailing the development of resistance (Ly et al., 2015). Other approaches may include combination therapies utilizing nanoparticles, natural components, and phage-based strategies (Holger et al., 2022b; Yassin et al., 2022; Wang et al., 2022). Additionally, promoting antibiotic stewardship and preventing the misuse and overprescription of colistin, particularly among physicians in developing countries, is essential for maintaining its effectiveness.

The considerable heterogeneity among the studies represents a primary limitation of this research. Nonetheless, through the use of subgroup analysis, we were able to identify sources of heterogeneity and mitigate its impact on the outcomes. Another limitation of this article is the exclusion of non-English studies, which may contain valuable data. The decision to focus solely on English-language research aimed to ensure accurate comprehension of the studies and maintain consistency in data quality and reporting. However, we recognize that this exclusion may compromise the comprehensiveness of our analysis. We encourage future research to incorporate studies in other languages to provide a more comprehensive view of the topic.

 Conclusion

Our study indicates that while the overall rate of resistance to colistin in P. aeruginosa is relatively low, there has been a recent upward trend in resistance levels. This underscores the importance of accurate surveillance of resistance rates, particularly in regions with higher prevalence, and the judicious prescription of antibiotics for patients with P. aeruginosa infection. Promoting antibiotic stewardship and preventing the misuse and overprescription of colistin, especially among healthcare professionals in developing countries, is crucial for preserving its efficacy.

 Data availability statement

The original contributions presented in the study are included in the article/Supplementary material, further inquiries can be directed to the corresponding author.

 Author contributions

NN: Data curation, Formal analysis, Software, Writing – original draft, Writing – review & editing. AK: Software, Validation, Writing – review & editing. LD-Z: Data curation, Methodology, Writing – review & editing. NB: Data curation, Methodology, Writing – original draft, Writing – review & editing. YF: Data curation, Methodology, Writing – review & editing. SS: Data curation, Methodology, Writing – review & editing. AZ: Supervision, Validation, Writing – review & editing. SR: Conceptualization, Supervision, Validation, Writing – review & editing.

 Funding

The author(s) declare that financial support was received for the research, authorship, and/or publication of this article. This study was funded by Microbial Biotechnology Research Center (Iran University of Medical Sciences) by a research grant (No. 18205).

 Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

 Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

 Supplementary material

The Supplementary material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fmicb.2024.1477836/full#supplementary-material

 Abbreviations

P. aeruginosa, Pseudomonas aeruginosa; PRISMA, Preferred reporting items for systematic reviews and meta-analyses guidelines; CI, Confidence interval; CLSI, The Clinical and Laboratory Standards Institute; EUCAST, European Committee on Antimicrobial Susceptibility Testing.

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