Abstract
Background
The French national authority for health (HAS) develops in-hospital indicators for improving quality of care, safety and patient outcome. Since 2017, it has developed a measurement of surgical site infections (SSI) after total hip or knee arthroplasty (TH/KA) by using a computerized indicator, called ISO-ORTHO, based on a hospital discharge database (HDD) algorithm. The aim of the study was to assess the performance of this new indicator .
Methods
The ISO-ORTHO performance was estimated via its positive predictive value (PPV) among adult patients having undergone a TH/KA between January 1st and September 30th 2018, based on the orthopaedic procedure codes. Patients at very high risk of SSI and/or with SSI not related to the in-hospital care were excluded. SSI were detected from the date of admission up to 90 days after the TH/KA using the ISO-ORTHO algorithm, based on 15 combinations of ICD-10 and procedure codes. Its PPV was estimated by a chart review in volunteer healthcare organisations (HCO).
Results
Over the study period, 777 HCO including 143,227 TH/KA stays were selected, providing 1,279 SSI according to the ISO-ORTHO indicator. The 90-day SSI rate was 0.89 per 100 TH/KA stays (0.98% for THA and 0.80% for TKA). Among the 448 HCO with at least 1 SSI, 250 HCO participated in reviewing 725 SSI charts; 665 were confirmed, giving a PPV of 90.3% [88.2-92.5%], 89.9% [87.1-92.8%] in THA and 90.9% [87.7-94.2%] in TKA.
Conclusions
The PPV of ISO-ORTHO over 90% confirms its validity for any use according to the HAS method. ISO-ORTHO and detailed information were provided in 2020 to HCO and used for quality assessment and in-hospital risk management.
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Introduction
Over the last few decades, the total number of hip (THA) and knee (TKA) arthroplasties performed annually in French hospitals has consistently increased reaching over 150,000 (French hospital discharge data 2017–2019, PMSI ATIH) [1,2,3]. This activity is rising due to the ageing population along with the increasing demands of patients in terms of functional capacities [4, 5]. Approximately 14.4% of patients report an adverse event during their surgical care, of which 5.2% are considered potentially preventable, especially after a joint replacement [6, 7]. The most frequent complications after THA and TKA (TH/KA) are infection with 1% of these surgeries subsequently resulting in surgical site infections (SSI) [8,9,10,11]. Due to the increasing frequency of arthroplasties and the potential impact of complications in terms of loss of quality of life and additional costs for the society [12, 13], SSI represent a key target for healthcare-associated infection surveillance [12,13,14,15,16].
In France, the SSI surveillance is one of the priority targets of the national program for the prevention of healthcare associated infections (PROgramme national de Prévention des Infections Associées aux Soins, PROPIAS [17]) as recommended by the High Council of Public Health. Whereas several countries are using national TH/KA registers for surveillance [18,19,20,21,22,23], no such dynamic and exhaustive national register exists in France. The French National Authority for Health (“Haute Autorité de Santé”, HAS) developed a national computerized SSI indicator in orthopaedic surgery for quality and safety improvement: ISO-ORTHO [27]. This indicator derived from an innovative French research project for SSI monitoring in orthopaedics, that validated an algorithm based on hospital discharge database (HDD) with an acceptable positive predictive value (PPV) of 87% [24,25,26]. In 2017, the HAS developed a revised version of this research SSI algorithm with a multidisciplinary working group composed of patients and experts of orthopaedics, anaesthesiology, epidemiology, infection control, medical information, and infectious diseases [27]. Subsequently, the HAS published the different methodological steps for its development and validation [19, 27,28,29,30,31,32,33]. Eventually, the definition of the ISO-ORTHO indicator was achieved through the optimization of SSI detection based on the coding practice guidelines of the Technical Agency for Information on Hospital Care (“Agence technique de l’information sur l’hospitalisation”, ATIH), along with redefining the exclusion criteria of the target population [34,35,36].
The aim of the present study was to validate the outcome indicator ISO-ORTHO by measuring its performance to detect SSI over the 90 days following a total TH/KA in France.
Methods
Study design and population
An evaluative study was performed to assess the performance of the ISO-ORTHO indicator via its PPV using a medical chart review. All adult patients with a hospital stay for TH/KA that occurred between January, 1st and September, 30th 2018 in the French national hospital discharge database were selected according to their surgical procedure for hip or knee replacement based on the French Common Classification of Medical Acts (THA: NEKA010, NEKA012, NEKA013, NEKA014, NEKA015, NEKA016, NEKA017, NEKA019, NEKA020, NEKA021; TKA: NFKA007, NFKA008, NFKA009). In case of multiple TH/KA stays, only the first was included. Exclusion criteria were patients at very high risk of SSI (history of complex SSI such as complex surgical procedures, another surgical act performed on hip or knee during the TH/KA stay, hip or knee surgery in the previous three months before hospital stay, hip fracture), with SSI not related to in-hospital care and/or data or linkage problems (error in the sex, birth date and/or social insurance number) (See Fig. 1, and arguments for inclusion and exclusion criteria detailed in AppendixA1).
Footnote of Fig. 1. Flowchart of the target population, SSI and HCOs
Inclusion criteria | 2018 |
---|---|
Stays with at least 1 TH/TKA stay | 158 478 |
HCOs | 791 |
Exclusion criteria | |
errors in the coding, misclassification, or linkage problems | 730 |
age under 18 | 69 |
Stays of adult patients with at least 1 TH/KA coded and without data and/or linkage problems | 157 682 |
admission for infection | 117 |
infection not related to the THA or TKA procedure : | 47 |
fracture as the reason for hip replacement | 10 386 |
emergency admission | 8 080 |
several acts of orthopaedic surgery in the same initial stay, or act of device change | 677 |
mechanic complication coded during the stay | 1 447 |
patients transferred from another HCO | 1 424 |
patients with a hospitalisation between TH/KA and the readmission for SSI | 106 |
hip or knee surgery in the previous three months before hospital stay | 1 160 |
palliative care detected 1 year before, within or 3 months after the TH/KA stay | 357 |
history of complex SSI detected in the previous year | 87 |
patient coming from another country (non-French residents)séjours de patients résidant hors France (codes géographiques entre 99,101 et 99,517 + 99,999) | 276 |
death during the surgical stay without any code of SSI | 283 |
length of stay over 90 days | 23 |
patients discharged against medical advice or escaped | 46 |
Excluded stays : N (%) | 13 635 (9%) |
Target TH/TKA stays | 143 227 |
Target THA | 75 311 |
Target TKA | 67 916 |
HCOs with at leat 1 THA/TKA target stay | 777 |
SSI detected 3 months after TH/KA replacement | 1,279 |
HCOs with at least 1 SSI detected by ISO-ORTHO | 470 |
HCOs with at least 1 SSI detected in their HCO : concerned by the chart review | 448 |
HCOs participating to the SSI chart review | 250 |
SSI reviewed | 725 |
Outcome
The occurrence of SSI was sought from the date of admission to 90 days after TH/KA surgery, using 15 combinations of ICD-10 codes of infection and/or complication and therapeutic or diagnostic procedure codes from the national HDD (Case definition of SSI in Table 1, and AppendixA.1). Any SSI occurring after 90 days has not been included.
Assessment
The SSI detected with ISO-ORTHO were checked using a medical chart review performed in volunteer healthcare organisations (HCO) having at least one SSI detected in their patients during the 90 days following surgery, or during the TH/KA stay, or a readmission in the same HCO between January 1st and September 30th 2018. The manual review occurred between December 20th 2019 and March 24th 2020. The process of chart review was carried out on a secured platform, including access to the medical charts meeting the SSI case definition and the forms required for case analysis. The chart review was conducted under the responsibility of the medical information department. The participation of a clinician (notably a surgeon or an anaesthetist) was required. To contribute to coding quality analysis and further improvement, guidelines for SSI and TH/KA coding were also provided to the HCO [35, 36].
The assessment of PPV was conducted in two consecutive steps (i) validation of the target population to confirm the TH/KA procedure with respect to the inclusion and exclusion criteria, (ii) identification of the true positive and residual false positive SSI cases. True positive cases were defined as SSI detected by the algorithm and confirmed in the patient chart, and false positive cases as SSI detected by the algorithm and not confirmed in the patient chart. Eventually, the PPV was estimated as the percentage of true positive SSI cases divided by the total SSI cases detected by the algorithm.
Results
Over the study period, 143,227 TH/KA stays were detected in the national HDD, coded by 777 HCO with at least one target TH/KA stay. Among them, 1,279 SSI were detected within 90 days after surgery, mostly during a readmission (97.4%)(Fig. 1). SSI rate was 0.89% in the study population, 0.98% for THA and 0.80% for TKA. The sociodemographic characteristics showed a male predominance (sex ratio 1.77), and a median age of 70 years old, independent of the prosthesis site.
Among the 777 HCO, 470 (60.5%) had at least one SSI detected within 90 days after arthroplasty. HCO reviewed patient charts of patients readmitted for SSI in the hospital where TH/KA procedure was performed, corresponding to 448 (95.3%) HCO. Of the 448 HCO, 250 HCO (56% of the 448) volunteered to perform it. A majority of them were private hospitals (68%), 22.8% were public general hospitals, and 9.2% were teaching hospitals. Their distribution of the type of HCO was similar to the 470 HCO with at least one case of SSI detected (AppendixA.2).
Eventually, 725 medical charts of SSI were reviewed, representing 57% of the hospital stays with SSI. 86% of the 725 medical charts were reviewed by infection control practitioners, 36% by orthopaedist surgeons, 19% by doctors specialized in medical information, 13% by doctors specialized in infectious diseases and 8.4% by anaesthesiologists.
Of the 725 reviewed SSI, 655 were confirmed SSI and 63 were not. Among the 63 cases of false positive SSI, 29 were SSI suspected but not subsequently confirmed, 10 were uninfected hematomas, 10 had missing information about a potential SSI in the medical chart, four were infections not related to the surgical site, three were related to a history of SSI, three were a revision surgery for another reason. Seventy-three target stays (10%) had at least one exclusion factor of the target population (Table I). The absence of, or incorrect, coding by HCO were the main reasons for the absence of SSI confirmation.
The PPV of the SSI algorithm was 90.3% [88.2%; 92.5%]. Among THA, 384 of the 427 SSI (89.9% [87.1%; 92.8%]) were true positives. Among TKA, 271 of the 298 SSI (90.9% [87.7%; 94.2%]) were true positives (Table II).
Discussion
We successfully validated the computerized indicator ISO-ORTHO, an outcome indicator in orthopaedics assessing SSI after a TH/KA in France. We demonstrated that automated SSI detection after total hip or knee arthroplasty using mandatory and available HDD is feasible and reliable regarding its performance to detect SSI. The PPV was estimated at 90% for both the combined indicator and the individual THA or TKA measures, confirming its potential use for different purposes (e.g. quality improvement and risk management, public disclosure, financial purpose) according to the HAS method [31]. Indeed, performance parameters can vary in quality and accuracy, as previously demonstrated [37,38,39,40]. According to the coding guidelines, SSI must be coded with a dedicated ICD-10 code: T84.5 associated with an infection code. This recommended combination of codes detected 66% of the SSI confirmed by the chart review. Variation in the coding practices required the use of 15 combinations of ICD-10 and procedure codes.
ISO-ORTHO has a very high PPV compared to the PPV found in literature, reported as 63.6% and 78% in other studies [11, 40, 41]. A PPV of at least 75% [31] is essential to ensure that it is consistent with the real practice and usable for quality and safety improvements [42]. The main reasons for false positives were suspicions of SSI that were not subsequently confirmed, the presence of an uninfected hematoma and a lack of SSI occurrence in the reviewed medical charts. They are mainly linked to the incorrect use of the coding instructions for SSI regarding the clinical information in medical charts [26, 30, 36, 43]. Validation of the target population showed 10% of remaining exclusion criteria linked to the absence of traceability of the information in the medical charts and/or the absence or incorrect coding by HCO.
Our study has, however, some limitations. The use of administrative hospital databases introduced an inherent bias that should be taken into consideration. The strengths and limitations of using healthcare databases for epidemiological purposes have already been extensively discussed [27, 42, 44, 45]. The coding practices could be heterogeneous and not accurate, especially concerning the type of SSI (deep or superficial) or the joint laterality. The built algorithm selects superficial and deep SSI and takes into account only the first primary arthroplasty. Moreover, SSI are rare events. In France, the incidence estimated in 2018 based on the reports of 258 voluntary HCO was 1.35% [1.16-1.54%] for THA including hip fractures, and 0.9% [1.72%-1.08%] for TKA [43]. The SSI rates detected by ISO-ORTHO are consistent with these previous results: 0.96% for THA and 0.80% for TKA and the difference could be notably explained by the population exclusion criteria. It was chosen to control only positive predictive value for reasons of relevancy when low event rates are concerned, as well as material and human feasibility. Given the low frequency of SSI, the number of subjects required to calculate a negative predictive value would be too high. For a purpose of quality management and improvement, a manual review of the medical charts on a voluntary basis was performed,to ensure consistency [46]. This has not led to a selection bias, as the volunteer HCO were representative of the entire target HCO (types of hospitals and regions) and more than half of the detected SSI were analysed. The PPV over 75% is reliable for quality assessment purposes [31, 42, 47]. Eventually, the SSI detection was focused on the 90 days following the arthroplasty whereas the SSI definition is up to 365 days; however, previous studies showed that a majority of SSI after a primary arthroplasty occurred in the first three months [19, 48].
Another limitation of indicators based on HDD is the lack of clinical and medical device data and the absence of a dynamic link between the occurrence of complications and electronic health records [49, 50]. In the absence of exhaustive clinical registries for THA and TKA, several things would be relevant to detect SSI, including patient follow up, automated complication monitoring from clinical, microbiological and imaging data warehouses. They could also be used to assess ISO-ORTHO PPV as well as its negative predictive value and sensitivity. Indeed, the algorithms and methods developed for this study have been refined and validated by matching HDD with clinical data from hospital repositories and data from biomedical laboratories available in the clinical data warehouses [49,50,51,52,53,54].
Conclusion
The ISO-ORTHO PPV over 90% confirms its validity to detect SSI over the 90 days following a TH/KA in France. According to the HAS method, it is suitable for healthcare quality improvement and in-hospital risk management, hospital accreditation as well as public disclosure and financial purposes. Following this validation study, 2018-19 results of the validated indicator (adjusted ratio of observed on expected SSI in the target TH/KA population) were released to the HCO in September 2020, enabling their use alongside other outcome indicators in orthopaedics using the French national HDD [31, 55,56,57,58] measuring thromboembolic events after TH/KA. They are used for in-hospital quality improvement and risk management, hospital accreditation and as decision making tools for regional and national policies; they also respond to users’ demand for more transparency and could be used for financial purposes.
Data Availability
If you require more details concerning data and materials, please contact us by sending an email to: leslie.guillon@univ-tours.fr.
Abbreviations
- ICD-10:
-
International classification of diseases, 10th version
- “Haute Autorité de Santé”, HAS:
-
French National Authority for Health
- HCO:
-
Healthcare organisations
- HDD:
-
Hospital discharge database
- PPV:
-
Positive predictive value
- SSI:
-
Surgical site infections
- THA:
-
Total hip arthroplasty
- TKA:
-
Total knee arthroplasty
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Acknowledgements
We thank all the medical doctors and infection control teams worldwide involved in the development of surveillance networks in response to or despite particular circumstances.
We thank healthcare professionals involved in this validation study despite the sanitary situation: surgeons, medical doctors, infection control teams, doctors specialized in medical information systems and medical information technicians, and Jessica Sambourg, medical student in public health.
We thank Dominic Thorrington at the HAS for language-editing and for proofreading the manuscript.
We thank the entire HAS multidisciplinary working group.
We would like to thank all those involved in the ATIH in the validation of the codes and data diffusion in the secure plateform, and particularly: Catherine le Gouhir, Nicole Melin, Yasmine Mokkadem, Pascaline Lebreton, Jean Paul Blanc, Marc Mossand, Pauline Renaud and Marie-Caroline Clément.
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LBB, PA, LMM, LGG conceived the study and drafted the study protocol. LBB PA LMM LGG AS KM provided and reviewed clinical data. LBB analysed the data. LGG KM PA AS LMM helped to interpret the data. LBB and LGG drafted the manuscript. The final manuscript was read and approved by all authors.LBB and LGG are equal contributors of the work and asked for that to be stated.
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The study was authorised by the French data protection board (Commission Nationale de l’Informatique et des Libertés – CNIL).
No consent was mandatory because no individual data are used. Indeed, in line with the French legislation on analyses of de-identified data, there was no requirement to provide the patients with study information or to receive the patients’ consent to publication of their anonymized personal data.
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Grammatico-Guillon, L., Banaei-Bouchareb, L., Solomiac, A. et al. Validation of the first computerized indicator for orthopaedic surgical site infections in France: ISO-ORTHO. Antimicrob Resist Infect Control 12, 44 (2023). https://doi.org/10.1186/s13756-023-01239-7
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DOI: https://doi.org/10.1186/s13756-023-01239-7