[Linking Interventional Cardiology clinical registry data with French hospital administrative data: Development and validation of deterministic record linkage]. / Appariement entre un registre régional de pratiques en cardiologie interventionnelle et la base médico-administrative d'hospitalisation française : développement et validation d'un algorithme d'appariement déterministe.

BACKGROUND: To recreate the in-hospital healthcare pathway for patients treated with coronary angiography or percutaneous coronary intervention, we linked the interventional cardiology registry (ACIRA) and the pseudonymized French hospital medical information system database (PMSI) in the Aquitaine region. The objective of this study was to develop and validate a deterministic merging algorithm between these exhaustive and complementary databases. METHODS: After a pre-treatment phase of the databases to standardize the 11 identified linking variables, a deterministic linking algorithm was developed on ACIRA hospital stays between December 2011 and December 2014 in nine interventional cardiology centers as well as the data from the consolidated PMSI databases of the Aquitaine region from 2011 to 2014. Merging was carried out through 12 successive steps, the first consisting in strict linking of the 11 variables. The performance of the algorithm was analyzed in terms of sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV). Strategies complementary to the initial algorithm (change in the order of variables and base preprocessing) were tested. Comparative analysis of merged/unmerged patients explored potential causes of mismatch. RESULTS: The algorithm found 97.2% of the 31,621 ACIRA stays to have sensitivity of 99.9% (95% CI [99.9; 99.9]), specificity of 97.9% (95% CI [97.7; 98.1]), PPV of 99.9% (95% CI [99.9; 99.9]) and NPV of 96.9% (95% CI [96.7; 97.1]). Complementary strategies did not yield better results. The unmerged patients were older, and hospitalized mostly in 2012 in two interventional cardiology centers. CONCLUSION: This study underscored the feasibility and validity of an indirect deterministic pairing to routinely link a registry of practices using hospital data to pseudonymized medico-administrative databases. This method, which can be extrapolated to other health events leading to hospitalization, renders it possible to effectively reconstruct patients' hospital healthcare pathway.

[Outpatient coronary angiography and percutaneous coronary interventions before and after the COVID-19 pandemic : experience of the Versailles hospital centre]. / Coronarographie et angioplastie coronaire ambulatoire avant et après la pandémie de COVID-19 : expérience du centre hospitalier de Versailles.

BACKGROUND: Same day discharge (SDD) diagnostic coronary angiography and percutaneous coronary interventions (PCIs) are increasingly performed, and indications extend to more complex procedures and more fragile patients. We report the evolution of SDD interventional cardiology activity in our centre since 2016, particularly before and after the COVID-19 pandemic. Secondarily, we analysed the feasibility and safety of SDD PCI. MATERIALS AND METHODS: We analysed the number and percentage of SDD coronary angiograms and PCIs (elective or ad hoc), during 4 periods of 11 months each, from September 2016 to July 2024. Periods 1 and 2 took place before COVID-19, periods 3 and 4 after. We also compared the rate of complications and conversion to hospitalisation between periods 1-2 and 4. RESULTS: A total of 9587 procedures were analysed, including 1558 SDD procedures. The total number of SDD interventional cardiology procedures increased progressively over the 4 periods, from 146 SDD procedures (7.5%) in 2016-2017 to 620 (27.2%) in 2023-2024. This increase included both diagnostic coronary angiograms (respectively: 10.9%; 12.2%; 33.6% then 28.9%) and PCIs (respectively: 0.9%; 5.6%; 16.1% then 24.4%). In the immediate post-COVID-19 period, a significant increase, uncorrelated with the natural progression, was observed for SDD diagnostic coronary angiography and ad-hoc PCI. There were no deaths or serious complications, the rate of minor complications (1.1%) and conversion to conventional hospitalisation (4.5%) were low. CONCLUSION: Provided a careful patient selection and rigorous organisation, SDD coronary angiography and PCI can safely be performed. The increase in the SDD interventional procedures, favoured by organisational (COVID-19) or economic constraints, need to be amplified.

[Patients hospitalized in the ICU for acute coronary syndrome from 2012 to 2021 : A single-center retrospective study]. / Les patients hospitalisés en réanimation pour un syndrome coronarien aigu de 2012 à 2021 : une étude rétrospective monocentrique.

INTRODUCTION: Acute Coronary Syndrome (ACS) are one of the main causes of mortality in France. Patients presenting with ACS are typically hospitalized in a specialized cardiology ward. The main objective of this study was to describe, characterize and evaluate the outcome of patients hospitalized for ACS in a generalist intensive care unit (rather than a cardiac care unit). METHODS: This was a retrospective study. Our population consisted of ACS patients admitted to an intensive care unit in a hospital center (Centre Hospitalier de Troyes) between 2012 and 2021. All patients admitted for ACS to the intensive care unit and who underwent coronary angiography were included. RESULTS: In 10 years, 104 patients, or 3.8% of ACS patients who underwent coronary angiography were admitted to intensive care. The majority were admitted after recovered cardiac arrest (72%) and were in cardiogenic shock (68%), accounting for a high in-hospital mortality (45.2%). In-hospital mortality was 45.2%. In multivariate analysis, the GRACE score was associated with in-hospital mortality (OR for each additional point = 1.024, 95% confidence interval 1.006-1.045, p = 0.01). Among the survivors, 88% had good neurological function when leaving the hospital. DISCUSSION: Mortality of ACS patients in intensive care was close to 50%. However, the neurological prognosis of the surviving patients was good. This population is rarely mentioned in the literature, and deserves to be evaluated by multicenter, prospective registries, with a view to improving management and prognosis.

[Registry CARDIO-ARSIF - Database on coronary angiography and percutaneous coronary invasive performed in Île-de-France]. / Registre CARDIO-ARSIF - Base de données sur les coronarographies et angioplasties coronaires réalisées en Île-de-France.

The CARDIO-ARSIF registry has been continuously collecting comprehensive data on coronary angiography and percutaneous coronary interventions (PCI) performed in the 36 catheterization laboratories across the Île-de-France region since 2000. Over the period from 2003 to 2022, this registry has recorded information from more than 330,000 patients, encompassing more than one million procedures. Among these procedures, 58% consisted of coronary angiography, 13% were percutaneous coronary interventions (PCI), and the remaining 28% were PCI performed on an ad-hoc basis. This extensive dataset serves as a valuable resource for both qualitative and quantitative assessments of practices and the relevance of procedures in the field of coronary invasive cardiology. The results of these analyses undergo annual validation by a dedicated scientific committee and are shared with the teams of investigators. The exploitation of this data has led to scientific publications, with one notable finding being a consistent reduction in the radiation doses received by patients, regardless of the type of procedure.

[Anomalous connections of coronary arteries : About 4 cases and litterature review]. / Les anomalies de connexion coronaires : à propos de 4 cas et revue de la littérature.

Coronary connection anomalies are a rare congenital anatomical aberration with an angiographic incidence of around 1%. In the majority of cases, these anomalies are incidentally discovered during coronary angiography or coro CT and remain silent without clinical translation, while in a certain number of cases, they can be responsible for serious clinical manifestations of up to sudden death. Coronary CT is crucial in the management of its patients since it makes it possible to objectify the presence of a pre-aortic course or the existence of an intramural aortic trajectory, two characteristics associated with the occurrence of sudden death. Through four clinical cases we illustrate the different situations in which we had to manage these anomalies.

[Myocardial infarction in the young : clinical characteristics, therapeutic aspects and in-hospital complications.] / Infarctus du myocarde chez le sujet jeune en Tunisie : caractéristiques cliniques, aspects thérapeutiques et complications intra-hospitalières.

AIM OF THE STUDY: The aim of our study was to assess the clinical, electrical, angiographic and therapeutic characteristics of young patients with acute myocardial infarction and to describe the prevalence of in-hospital complications. PATIENTS AND METHODS: FromJanuary 2014 to May 2017, we retrospectively studied data of patients with acute myocardial infarction younger than 45 years old in the department of cardiology of Charles Nicolle hospital of Tunis. RESULTS: We enrolled 108 patients in the study. The prevalence of myocardial infarction in young patients was 8.5%. The mean age was 39.5 ± 5.5 years with a sex-ratio of 11. The most frequent cardiovascular risk factors were smoking (88%) and dyslipidaemia (51.9%). We reported 75 cases of ST segment elevation myocardial infarction. Primary angioplasty was performed in 41.3% of cases while lytic therapy was administered for the rest of the patients. It was successful in 75% of cases. Among 33 patients who presented with non-ST segment elevation myocardial infarction, percutaneous coronary angioplasty was performed in 60.6% of patients while 15.2% have undergone coronary artery bypass surgery and 24.2% received medical treatment only. In-hospital complications occurred in 39.8% of cases. In-hospital mortality was 1.9 %. CONCLUSIONS: Acute myocardial infarction in the young represents a serious health problem. Primary preventive measures aimed at preventing our youth from adopting tobacco use and developing dyslipidemia should be implemented to delay and even to avoid the onset of coronary artery disease.

[Personalized Therapeutic Concepts in Chronic Coronary Syndromes]. / Personalisierte Therapie des chronischen Koronarsyndroms.

Personalized Therapeutic Concepts in Chronic Coronary Syndromes Abstract. Chronic coronary syndromes (CCS) are related to substantial morbidity and mortality. Myocardial ischemia in CCS is caused by either obstructive or non-obstructive alterations of the coronary arteries, including both morphological and functional changes of epicardial vessels and the coronary microvasculature. Diagnostic algorithms of patients with suspected CCS include non-invasive and invasive imaging and functional testing. Therapeutic management comprises lifestyle changes, optimal medical therapy, and coronary revascularization when indicated. This review summarizes the contemporary management of patients with CCS, focusing on the role of invasive assessment and treatment.

[Imaging of coronary aneurysms in adults' coronary aneurysms]. / Imagerie des anévrismes coronaires de l'adulte.

Coronary aneurysms are rare and of various etiologies in adults. Natural history, modalities of management and clinical monitoring remain poorly known due to the lack of large studies and homogeneous diagnostic and follow-up criteria in the published data. Coronary angiography is, so far, the most common diagnostic tool but can overlook some partially thrombosed aneurysmal. Intracoronary imaging, particularly intravascular ultrasound, can differentiate aneurysms from pseudoaneurysms considered by some to be at greater risk of events, requiring a curative treatment. Intracoronary imaging can also help with etiological assessment and percutaneous treatment. With its growing use in the search for coronary atheromatous disease, coronary CT angiography has become a major diagnostic tool for coronary aneurysms. In addition, that it can incidentally detect coronary aneurysms, coronary CT angiography is particularly useful for giant aneurysms poorly visualized on coronary angiography or less well evaluated by intracoronary imaging. It specifies their relationship with adjacent anatomical structures. It is also a non-invasive modality of monitoring. These three imaging tools are currently the most relevant in current practice pending large studies evaluating the natural history of coronary aneurysms, with the identification of possible risk factors that could modify the management.

Fragmented QRS as a marker of coronary atherosclerosis severity evaluated by the Gensini score.

BACKGROUND: QRS fragmentation (fQRS) represents a marker of local myocardial fibrosis, especially in patients with CAD (coronary artery disease). However, little is known about the association between fQRS and the severity of coronary atherosclerosis as defined by the Gensini score. OBJECTIVE: To identify the angiographic and echocardiographic characteristics of patients with suspected CAD depending on the location and extent of fQRS. METHODS: A total of 178 patients who underwent coronary angiography were included in the study. fQRS was defined as the presence of RSR' and/or notching of the R/S wave (if QRS<120ms) or≥2 notches of the R/S wave (if QRS≥120ms). All patients were divided into three groups: non-fQRS; fQRS in 1-2 and≥3 leads. RESULTS: Statistically significant differences in the LVEF (left ventricular ejection fraction, P=0.009) and the degree of coronary atherosclerosis severity (P=0.008) were found among 3 groups. The median Gensini score was 7 in non-fQRS group (minimal CAD) and >20 in other groups (severe CAD). Both the anterior and lateral fQRS groups had a lower LVEF compared to no fQRS (P=0.039 and P=0.01, respectively). The median Gensini score was significantly higher in case of the lateral fQRS (P=0.037). fQRS in≥1 lead was associated with coronary occlusion (OR 2.1, 95% CI: 1.1-4.1, P=0.038). CONCLUSIONS: The presence of fQRS, particularly in lateral leads, can be a useful noninvasive marker of severe coronary atherosclerosis. Patients with≥1 fragmented lead have a lower LVEF, a higher Gensini score and a two-fold increased risk of occlusion.

[Coronary angiography my false friend]. / Mon faux-ami l'angiographie coronaire.

Coronary angiography has been a long-standing friend since the first selective injection by Sones in 1958. More than 400,000 coronary angiographies are performed each year in France for the diagnosis and treatment of ischemic heart disease. In just over 60 years, examinations have become simpler, with imaging that has considerably progressed. Nevertheless, it remains an invasive and radiating examination and requires an injection of a potentially nephrotoxic contrast medium. It is a two-dimensional projection of a luminogram of small arteries, in perpetual movement. The technical realization must be perfect, the analysis of the images must be careful. It is important to be aware of the pitfalls and limitations of the examination, and to rely on complementary techniques to resolve ambiguities, whether functional (FFR, IMR) or morphological (IVUS, OCT). Although non-invasive explorations, such as coroscanner, are in full development, these alternative methods have other limitations (lack of resolution, artifacts related to calcifications) which mean that angiography often remains essential for the diagnosis of coronary artery disease, indispensable for deciding on treatment and guiding revascularization. All of these elements make coronary angiography the definition of a friend: someone you know well... but you love anyway.

[The Role of Percutaneous Coronary Revascularization in Chronic Coronary Syndromes]. / Perkutane koronare Revaskularisation beim chronischen Koronarsyndrom: wann sinnvoll, wann nicht?

The Role of Percutaneous Coronary Revascularization in Chronic Coronary Syndromes Abstract. Coronary heart disease represents the leading cause of morbidity and mortality worldwide. Optimal management of these patients is therefore crucial and includes lifestyle changes, optimal medical therapy, and coronary revascularization. This review summarizes diagnostic and therapeutic strategies of patients with chronic coronary syndromes, focusing on the 2019 European Society of Cardiology (ESC) guidelines for the diagnosis and management of chronic coronary syndromes. In particular, the role of invasive assessment and coronary revascularization in chronic coronary syndromes is discussed.

Coronary angiography in the setting of acute infective endocarditis requiring surgical treatment.

BACKGROUND: International guidelines recommend that preoperative coronary angiography is performed on patients at risk of coronary disease who have infective endocarditis requiring surgical treatment. However, the risks of contrast-induced nephropathy or vegetation embolization in case of aortic endocarditis should be considered. AIMS: To assess the safety, therapeutic implications and prognostic impact of coronary angiography in patients requiring surgical treatment for active infective endocarditis. METHODS: This retrospective monocentric study was conducted in patients referred to a tertiary care centre for active endocarditis management with a theoretical indication for surgery between January 2013 and February 2017. RESULTS: One hundred and ninety-three patients were included; 73.1% were men, the mean age was 61.9±16.3 years and the median EuroSCORE II was 5.8%. One hundred and nineteen patients (61.7%) had aortic endocarditis, which was associated with aortic vegetation in 74 cases (38.3%). Invasive coronary angiography was performed in 142 patients (73.6%) - 130 (91.6%) by radial approach - and 14 patients were evaluated by coronary multislice computed tomography (one patient had exploration with both techniques). Acute renal failure after coronary angiography was observed in 15 patients (10.6%), two patients (1.4%) presented a stroke within 24h after coronary angiography, but none had aortic endocarditis. Among the 178 patients (92.2%) who underwent surgery, 35 (19.7%) had significant coronary lesion(s) and 25 (14.0%) underwent an associated coronary artery bypass graft. CONCLUSIONS: Preoperative coronary angiography in patients affected by infective endocarditis provides relevant information in a significant proportion of patients and can be performed safely.

[Complications of coronary invasive procedures in nonagenarians: A case-control study]. / Complications des procédures invasives coronaires chez les nonagénaires : une étude cas-témoins.

INTRODUCTION: Coronary heart disease is the leading cause of morbidity and mortality in nonagenarians, whose numbers have doubled in twenty years. In the absence of recommendations, the place of coronary invasive strategy in this population remains a therapeutic challenge and its interest as well as its risks are poorly established. The aim of our study was to evaluate the safety of coronary invasive practice in the nonagenarian population for all indications. POPULATION AND METHODS: This was a monocentric case-control study conducted from January 1, 2010 to May 30, 2019. The patients included were all nonagenarians who had undergone coronary angiography at the centre hospitalier de Troyes during this period. For each patient included, two controls matched on sex, date of procedure and procedure were drawn at random. The main judgment criterion was the occurrence of immediate per- or post-procedure complications during the stay in which the procedure was performed. The main secondary outcome measures were average length of stay, occurrence of intercurrent events during the stay (nosocomial infections, confusional syndrome), and loss of autonomy. RESULTS: In all, 59 nonagenarians and 118 controls were included in our study. We identified 30.5% major complications in the nonagenarians versus 10.2% in the controls (P=0.001; OR=0.26 [0.1-0.6]), with a significant difference in the occurrence of cardiogenic shock (P=0.04), heart failure (P=0.02) and ventricular rhythm disorders (P=0.04). Post-procedure acute renal failure was greater in the nonagenarians (P=0.02; OR=0.20 [0.05-1.57]). The mean length of stay was on average twice as long in the nonagenarians. CONCLUSION: Nonagenarian patients are subject to more complications when undergoing coronary invasive procedures compared to patients under 75.

[TAVI and coronary revascularization]. / TAVI et revascularisation coronaire.

Transcatheter aortic valve implantation (TAVI) has become the major approach to manage the severe aortic stenosis in inoperable patients that frequently present a coronary artery disease. To date, the available data related to the impact of these coronary lesions on survival is conflicting. When indicated, coronary revascularization could be beneficial for proximal lesions when performed before or during TAVI. The per-procedure coronary artery occlusion is rare, but with a bad prognosis. The coronary occlusion is more frequent with short distance of the coronary implantation and the small aortic sinuses, mostly occurring in the left main coronary. The scan analysis to identify high-risk cases is therefore important before the procedure in order to anticipate and prevent complications by specific techniques. Recently, late occlusion cases have been described and linked to thrombus or fibrosis mechanisms. The rate of success of percutaneous coronary intervention (PCI) after TAVI approach is weak, because of the difficulties of selective catheterization due to the stent of prosthesis. The different techniques of PCI have been outlined according to the type of the prosthesis.

[Radial approach in the elderly]. / Abord radial chez le sujet âgé.

Due to the steady increase in life expectancy, the number of patients over 80 years of age proposed for coronary angioplasty is increasing significantly. The elderly patient is a patient at high cardiovascular risk and high risk of bleeding; whose severity of prognosis depends of comorbidities. The radial approach presents particularities and technical difficulties that have to be known in this part of the population, but reduce vascular and hemorrhagic complications, as well as mortality. Because of greater safety, the radial approach is therefore the first choice for the elderly.

Reduction of radiation exposure associated with renewal of the radiologic systems in coronary interventions.

PURPOSE: Interventional coronary procedures are an important source of radiation. This study sought to evaluate the effect of the renewal of the radiologic system on patient exposure during diagnostic coronary angiography (DCA) and percutaneous coronary interventions (PCIs). METHODS: DCA and PCIs were obtained from three centres, which renewed their radiologic systems during their participation in the multicentre prospective observational RAY'ACT-2 study. Data were analysed from the months before and after the radiologic system was changed. The primary outcomes were the dose reduction estimated by the kerma.area product (KAP in Gy·cm2) and the ratio of the KAP to fluoroscopy time (Gy·cm2·min-1). RESULTS: A total of 2148 patients underwent DCA (1575 before and 573 after the system change), and 1563 underwent PCI (1196 before and 367 after). A change in the radiologic system was associated with a KAP reduction of 43% for DCA (median [interquartile range]: 18.1Gy·cm2 [10.2-34.0] versus 31.5 [19.0-49.0], P<0.0001), and 38% for PCI (42.2Gy·cm2 [23.8-81.7] versus 70.1 [42.0-109.0], P<0.0001). Fluoroscopy time did not vary significantly, and the ratio KAP to fluoroscopy time significantly decreased by 54%. The dose reduction was homogeneous between the three centres and between different manufacturer's systems. CONCLUSIONS: In this multicentre study, the renewal of the radiologic system was associated with a highly significant 40%-50% reduction in radiation dose, irrespective of the manufacturer. A close interaction between manufacturers and operators is needed to optimise the use of new equipment and the effectiveness of radiation reduction tools and techniques.

[Spontaneous coronary artery dissection: An exceptional cause of acute coronary syndrome]. / Dissection spontanée des artères coronaires : une cause rare de syndrome coronarien aigu.

Spontaneous coronary artery dissection (SCAD) is an uncommon cause of acute coronary syndrome (ACS) or sudden death, which typically affects young women. We reported two cases of black Africans patients, aged 56 and 52 years old, who presented to Abidjan Heart Institute for ACS. Coronary angiography showed spontaneous dissection of the right coronary artery in the first case, and dissection of the distal left anterior descending artery in the second. A conservative approach was preferred. Both patients received antiplatelet agents, beta-blockers, angiotensin converting enzyme inhibitors and statins, with a favorable in-hospital course. These cases highlight SCAD as a possible cause of ACS. Implementation of interventional cardiology in Sub-Saharan Africa will help identify this uncommon cause of ACS.

[Management of NSTEMI in a hospital without interventional cardiology and without use of GRACE score: Does the clinician appreciation match the GRACE score calculated retrospectively for the coronarography delay?] / Prise en charge des syndromes coronaires aigus sans sus décalage du ST dans un hôpital sans cardiologie interventionnelle : l'appréciation du clinicien rejoint-elle le score de GRACE dans le délai de réalisation de la coronarographie ?

PURPOSE: The management of non-ST segment elevation acute coronary syndromes (NSTEACS) remains an issue for mobidity, mortality, and an economic stake. The first aim of the study was to evaluate the additional value of the GRACE score for the compliance with the recommended times to coronary angiography in an hospital without interventional cardiology. We also analysed the in-hospital and 6-month mortality and the predictive factors of compliance for the coronarography delays. METHODS: Retrospective monocenter cross-sectional study including consecutive patients with chest pain suggestive of a NSTEACS during 1 year. Data of the delay to coronarography were collected and GRACE score was calculated a posteriori. RESULTS: The time to perform coronary angiography was non-compliant in 49% of cases (27 patients out of 55). The calculation of the GRACE score would have allowed correcting the delay for two patients of our cohort. Clinical appreciation, troponin elevation, ECG modifications were associated with the delay compliance. Age <75 years predisposed to recommended delays. Renal failure and history of coronaropathy were significantly associated with non compliant delays. A non-compliant delay was significantly associated with higher mortality. CONCLUSION: In our experience, the knowledge of the GRACE score had little impact on the timing of coronary angiography. However, as a predictor of mid and long term mortality, GRACE score remains SCA ST+ useful to intensify surveillance of high-risk patients.

[Late discover of a coronaro-pulmonary fistula]. / Une fistule coronaro-pulmonaire de découverte tardive.

Anomalies of the coronary arteries mainly concern a pediatric population, bringing together a wide range of defects. In adults, the evolution is linked to the hemodynamic consequences of fistula. Several therapeutic options have been proposed such as surgery or embolization. We report the case of a 55 years old patient addressed because of dyspnea secondary to aortic insufficiency. The preoperative assessment shown the coexistence of coronary abnormality corresponding to a coronaro-pulmonary fistula. This type of coronary anomaly is rarely described in the adult population, because of its consequences secondary to the closure of the foramen ovale, resulting in angina symptoms in childhood. Without treatment, mortality from this type of malformation is important (90%).

Radial versus femoral access for coronary angiography and intervention is associated with lower patient radiation exposure in high-radial-volume centres: Insights from the RAY'ACT-1 study.

BACKGROUND: Literature suggests that radial access is associated with higher radiation doses than femoral access. AIMS: To compare patient radiation exposure during coronary angiography (CA) and percutaneous coronary intervention (PCI) with radial versus femoral access. METHODS: RAY'ACT is a nationwide, multicentre, French survey evaluating patient radiation in interventional cardiology. Variables of patient exposure from 21,675 CAs and 17,109 PCIs performed at 44 centres during 2010 were analysed retrospectively. RESULTS: Radial access was used in 71% of CAs and 69% of PCIs. Although median fluoroscopy times were longer for radial versus femoral access (CA, 3.8 vs 3.5minutes [P<0.001]; PCI, 10.4 vs 10.1minutes [P=0.001]), the Kerma-area product (KAP) was lower with radial access (CA, 26.8 vs 28.1Gy·cm2; PCI, 55.6 vs 59.4Gy·cm2; both P=0.001). Differences in KAP remained significant in the multivariable analysis (P<0.01), and in a propensity score-matched analysis (P=0.01). A significant interaction was found between KAP and the percentage of procedures with radial access by centre (P<0.001). KAP was higher by radial versus femoral access in low-radial-volume centres, and lower in high-radial-volume centres. Radiation protection techniques, such as the use of low frame rates (7.5 frame/s), were used more frequently in high-radial-volume radial centres. CONCLUSIONS: In this multicentre study, radial access was associated with lower radiation doses to patient than femoral access in high-radial-volume centres. Provided that radioprotection methods are implemented, radial access could be associated with lower patient radiation exposure.