Peer Review History
| Original SubmissionOctober 19, 2024 |
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PONE-D-24-46888Difficult-to-Treat Resistant Pseudomonas aeruginosa Infections in Lebanese Hospitals: Impact on Mortality and the Role of Initial Antibiotic TherapyPLOS ONE Dear Dr. Itani, Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process. Please submit your revised manuscript by Feb 10 2025 11:59PM. If you will need more time than this to complete your revisions, please reply to this message or contact the journal office at plosone@plos.org . When you're ready to submit your revision, log on to https://www.editorialmanager.com/pone/ and select the 'Submissions Needing Revision' folder to locate your manuscript file. Please include the following items when submitting your revised manuscript:
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Please also provide details on how you will ensure persistent or long-term data storage and availability. [Note: HTML markup is below. Please do not edit.] Reviewers' comments: Reviewer's Responses to Questions Comments to the Author 1. Is the manuscript technically sound, and do the data support the conclusions? The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented. Reviewer #1: Partly ********** 2. Has the statistical analysis been performed appropriately and rigorously? Reviewer #1: Yes ********** 3. Have the authors made all data underlying the findings in their manuscript fully available? The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified. Reviewer #1: No ********** 4. Is the manuscript presented in an intelligible fashion and written in standard English? PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here. Reviewer #1: Yes ********** 5. Review Comments to the Author Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters) Reviewer #1: The authors submitted a manuscript investigating Pseudomonas aeruginosa infections in 4 Lebanese tertiary care hospitals, with a particular focus on the prevalence and impact of DTR isolates, as well as the apppropriateness of initial antibiotic therapy and predictors of 30-day in-hospital mortality. - The manuscript describes exclusion criteria (e.g., <48 h hospital stay, incomplete records, co-infections). This is raises the risk of selection bias. please expand on the rationale for excluding patients discharged or leaving the hospital within 48 hours (this will be further touched upon later in my report). Were some of those patients potentially stable, or were they left out simply because they might not have had time to develop or treat an infection? The flow diagram (Figure 1) is helpful, but more detail on potential biases from these exclusions would be beneficial. - This endpoint can overestimate infection-attributable deaths. The authors acknowledge this limitation. discuss how infection-related mortality was confirmed, or whether chart reviews attempted to differentiate conflicting causes of death. a. A Kaplan-Meier with log-rank comparisons for time-to-mortality is used. The difference for time-to-event between DTR vs. non-DTR just misses significance (p=0.07), but the difference based on appropriateness of initial therapy is significant (p=0.03). The text reports “mean survival time” and 95% CIs that appear somewhat narrow (e.g., for the DTR group in Table 4: 4.06–7.93 days?). The survival curves appear to go out to 30 days; thus, the meaning of that confidence interval needs more clarity. Are these the 95% CIs for median survival times? b. The approach to univariate → multivariable logistic regression is described, with a p < 0.2 cut-off for inclusion. The text says that forward stepwise selection was used, and that variance inflation factors (VIF > 10) triggered exclusion. This is reasonable, but it is unclear which variables were excluded due to collinearity, I will mention this again below in detailed analysis. More detail would help: for instance, was the site of infection acquisition (ICU vs. non-ICU) collinear with nosocomial vs. community infection? Also, the final model includes female sex, DTR infection, and appropriateness of therapy. Yet the univariate table also identified age ≥ 65, CCI, and glucocorticoid use as having p<0.2. Possibly these were excluded for collinearity reasons, but clarifying this in the text would be important to ensure transparency. c. The mortality rate of 14.8% fits within expected estimates. The discussion section offers does not offer sufficient rationale or thoughts as to why female patients had higher mortality. Assuming that any difference in comorbidity that is gender based would be accounted for in a logistic regression model; please expand on potential epidemiologic reasons (e.g., healthcare-access?) . Again this will be mentioned in more detail below d. Despite the non-significant p=0.07 in the survival analysis, the logistic regression finds DTR to be an independent predictor of mortality (AOR 3.11). This discrepancy likely arises from how survival times were partitioned and the additional effect of confounders in the multivariable model. Please provide provide a short note about this distinction in the Discussion. Some reasons may require interpretation as to why the log-rank p-value for time-to-mortality differs from the logistic regression results. e. More detail on how the authors handled or imputed missing data (if any was imputed at all) is needed. As stated a major data gap is post-discharge therapy and outcomes which is understandable given the study’s retrospective design, but the authors might mention whether they attempted to collect data from outside the hospital within that context for some patients or if that was uniformly unavailable. -Did all four hospitals use the same AST platforms and interpretative standards (CLSI vs. EUCAST)? - Table 1 indicates that 6 patients received CAZ-AVI empirically. Please provide context for this empiric practice and whether the AST associated with these 6 patients justified appropriate CAZ-AVI use. -The same can be said about the empiric usage of several agents such as ceftaroline, linezolid, and colistin. Please elaborate on whether these are errors. By empiric, most readers will consider this to represent Pre-AST. Given that data from your region is harder to come by your cohort can reveal more and inform more about the epidemiology: - Please inform readers of the routine AST agents performed for pseudomonas aeruginosa. Is CAZ-AVI susceptibility testing reflex tested with carbapenem non-susceptibility? -What percentage of isolates were resistant to CAZ-AVI? -Is Ceftolozane-tazobactam available in any of the medical centers included in the study? If yes, what % os isolates were non-susceptible to TOL-TAZ? -Is Cefiderocol available in any of the medical centers included in the study? Was resistance encountered? -Did you encounter on follow up cultures resistance to any B-lactam derived agents including cephalosporins or carbapenems or CAZ/AVI during treatment -For definitive antibiotic therapy, also seen in Table 2; I am assuming Fosfomycin is the IV formulation. Please indicate (IV) in brackets in the table. Many readers are only familiar with PO FOS in the setting of UTIs. You mention the absence of national surveillance data and “the paucity of well-designed studies” on DTR PA in Lebanon. Are there any recent steps taken nationally to track AMR? A few lines referencing the challenges of implementing surveillance is helpful in epidemiologic studies. - With regards to the 4 hospitals in Beirut city, do they differ in patient populations, bed capacity, or infection-control measures? - Were patients <48 hrs excluded because they might not have had time to be fully evaluated or treated? Other reasons? -Please quantify the effect of excluding from your study patients who left the hospital within 48 hours of acquiring infection. How does this exclusion impact the observed results and conclusions. A bias may have been inadvertently introduced by excluding mild infections that had resolved more rapidly. This is relevant to the observed significant findings. How might this exclusion have impacted the stepwise model, and ultimately across significant subgroups as it pertains to primary outcomes. -Did any variables meet the >10 VIF threshold and thus get excluded from the final model? If so, which ones? -Including a short table of final retained variables following univariate analysis would help or otherwise incorporating, bolding, or annotating with symbols may be sufficient to show the final included variable at a glance. -How might confounding variables may shift results showing survival analysis results demonstratinhg a near-significant difference in log-rank tests for DTR vs. non-DTR (p=0.07), especially given that logistic regression finds DTR to be a significant independent predictor. -Given the relatively advanced age and high comorbidity burden, do you have severity-of-illness scores (e.g., APACHE II, SOFA on admission)? You mention a mean SOFA of ~5.89 for those who developed sepsis, but it might be helpful to note baseline severity if available, to interpret outcomes. -Did you observe any association between specific infection sites and higher rates of DTR or carbapenem resistance? -For patients whose antibiotics were inappropriate due to resistance, do you have data on local antibiotic guidelines that might reduce these mismatches? -noting that 30 patients experienced >48 hours delay in therapy initiation. Was this due to diagnostic delays, or were there other logistical/administrative reasons? -Similar to above, what are the major prevailing reasons for delays in de-escalation or switching after the results of AST became available (noting that this occurred in almost 19%) -Going over the multivariable analysis in more detail and table 6 showing three independent mortality predictors: 1. Female sex (AOR=4.41) 2. DTR infection (AOR=3.11) 3. Inappropriate initial therapy (AOR=1.43) - Did you stratify or examine the distribution of comorbidities (hypertension, CHF, etc.) by sex? Could confounders remain unrecognized (e.g., older women with multiple comorbidities)? - Could ICU admission or other severity metrics modify (mediate or confound) the effect of sex on mortality? Please touch on these topics to increase the value of the discussion - To what extent do isolates within your cohort demonstrate simultaneous carbapenem resistance with susceptibility to cefepime or Pip/Taz? Briefly touch on the potential mechanisms of carbapenem resistance in isolates with concomitant susceptibility to 4th gen cephalosporins or Pip/taz. Discuss whether this particular pattern is unique to your epidemiologic setting or healthcare system. This is especially relevant since you have suggested a change in empiric practices based on this data. Does this pattern of pseudomonas aeruginosa resistome generalize to other institution in your country or region? Is there any molecular regional data pertaining to oprD downregulation that you can allude to? - I would recommend against suggesting practice changes based on observational studies in a manuscript. The more appropriate reflection based on the limitations of this study design is somewhere along the lines of ‘interesting results but need randomized data to inform practice’ etc. - another limitation worth mentioning along with the lack of any molecular data within this study or mention of any specific PDCs, outer porin regulation, and PBP mutations among others. - Would any rapid diagnostic tools expedite targeted therapy in the described context of a lack of standardized antibiotic protocols and the necessity of improved stewardship? - Within the framework of ther results showing that inappropriate initial therapy (including timing/dose errors) being common; haave you considered analyzing whether a “bundle approach” (i.e., checklists for sepsis, analysis of DTR risk factors/daily stewardship rounds) could systematically lower this rate? - Please ascertain within your cohort the instances of inappropriate antibiotic therapy (with Pip/Taz or cefepime) where a carbapenem should have been prescribed empirically (based on risk factors). Suggest emphasizing in the discussion any missed covariates (e.g., baseline severity scores, or comorbid conditions) that might influence results. -AST data from Lebanon would be interesting to a global audience. If you are able to provide raw AST data on all isolates in a supplement, it would be appreciated and carry value. ********** 6. PLOS authors have the option to publish the peer review history of their article (what does this mean? ). If published, this will include your full peer review and any attached files. If you choose “no”, your identity will remain anonymous but your review may still be made public. Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy . Reviewer #1: Yes: Mohamad Yasmin ********** [NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". If this link does not appear, there are no attachment files.] While revising your submission, please upload your figure files to the Preflight Analysis and Conversion Engine (PACE) digital diagnostic tool, https://pacev2.apexcovantage.com/ . PACE helps ensure that figures meet PLOS requirements. To use PACE, you must first register as a user. Registration is free. Then, login and navigate to the UPLOAD tab, where you will find detailed instructions on how to use the tool. If you encounter any issues or have any questions when using PACE, please email PLOS at figures@plos.org . Please note that Supporting Information files do not need this step. |
| Revision 1 |
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<p>Difficult-to-Treat Resistant Pseudomonas aeruginosa Infections in Lebanese Hospitals: Impact on Mortality and the Role of Initial Antibiotic Therapy PONE-D-24-46888R1 Dear Dr. Rania Itani, We’re pleased to inform you that your manuscript has been judged scientifically suitable for publication and will be formally accepted for publication once it meets all outstanding technical requirements. Within one week, you’ll receive an e-mail detailing the required amendments. When these have been addressed, you’ll receive a formal acceptance letter and your manuscript will be scheduled for publication. An invoice will be generated when your article is formally accepted. Please note, if your institution has a publishing partnership with PLOS and your article meets the relevant criteria, all or part of your publication costs will be covered. Please make sure your user information is up-to-date by logging into Editorial Manager at Editorial Manager® and clicking the ‘Update My Information' link at the top of the page. If you have any questions relating to publication charges, please contact our Author Billing department directly at authorbilling@plos.org. If your institution or institutions have a press office, please notify them about your upcoming paper to help maximize its impact. If they’ll be preparing press materials, please inform our press team as soon as possible -- no later than 48 hours after receiving the formal acceptance. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. Kind regards, Giuseppe Pipitone, M.D. Academic Editor PLOS ONE Additional Editor Comments (optional): Reviewers' comments: |
| Formally Accepted |
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PONE-D-24-46888R1 PLOS ONE Dear Dr. Itani, I'm pleased to inform you that your manuscript has been deemed suitable for publication in PLOS ONE. Congratulations! Your manuscript is now being handed over to our production team. At this stage, our production department will prepare your paper for publication. This includes ensuring the following: * All references, tables, and figures are properly cited * All relevant supporting information is included in the manuscript submission, * There are no issues that prevent the paper from being properly typeset If revisions are needed, the production department will contact you directly to resolve them. If no revisions are needed, you will receive an email when the publication date has been set. At this time, we do not offer pre-publication proofs to authors during production of the accepted work. Please keep in mind that we are working through a large volume of accepted articles, so please give us a few weeks to review your paper and let you know the next and final steps. Lastly, if your institution or institutions have a press office, please let them know about your upcoming paper now to help maximize its impact. If they'll be preparing press materials, please inform our press team within the next 48 hours. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. If we can help with anything else, please email us at customercare@plos.org. Thank you for submitting your work to PLOS ONE and supporting open access. Kind regards, PLOS ONE Editorial Office Staff on behalf of Dr. Giuseppe Pipitone Academic Editor PLOS ONE |
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