Interventional cardiology in Europe 1993. Working Group on Coronary Circulation of the European Society of Cardiology

Short and long term mortality after coronary artery bypass grafting (CABG) is influenced by socioeconomic position but not by migration status in Sweden, 1995-2007

Background

There are no nationwide studies on mortality after coronary artery bypass grafting (CABG) among foreign-born populations that include detailed information about country of birth and information about socioeconomic position. The objective was to investigate the risk of mortality after CABG considering socioeconomic position, sex and country of birth.

Material and Methods

We included all 72 333 patients undergoing a first isolated CABG in Sweden, during 1995 - 2007 of whom 12.7% were foreign-born. The patients were classified according to educational level, sex, and country of birth and were followed up to December 2007. We estimated the risk of short and long term mortality after CABG in a multivariable model adjusted for age, calendar year of surgery, diabetes, educational level, and waiting time for surgery. Hazard ratios (HR) with 95% confidence intervals (CI) were calculated based on the Cox proportional hazard model.

Findings

There were 15,284 deaths during the follow-up, 10.4% of whom were foreign-born. The foreign-born patients were 3 to 4 years younger than Sweden-born patients at the time of CABG surgery. There were no significant differences in overall early or late mortality between foreign-born and Sweden-born men and women after CABG. All-cause mortality differed in between regions and was highest in foreign-born men from Eastern Africa (HR 3.80, 95% CI 1.58–9.17), China (HR 3.61, 95% CI 1.50–8.69), and in Chile (HR 2.12, 95% CI 1.01–4.47). Patients with low level of education had worse survival compared to those with longer than 12 years of education irrespective of sex and country of birth. This difference was more pronounced among foreign-born women (HR 1.50, 95% CI 1.00–2.33).

Conclusion

This national study showed higher CABG mortality in patients from lower socioeconomic position. Early and late mortality did not differ after isolated CABG in foreign-born and Sweden-born patients.

Percutaneous coronary interventions in Europe: prevalence, numerical estimates, and projections based on data up to 2004

AIMS

A registry mandated by the European Society of Cardiology collects data on trends in interventional cardiology within Europe. Special interest focuses on relative increases and ratios in new techniques and their distributions across Europe. We report the data through 2004 and give an overview of the development of coronary interventions since the first data collection in 1992.

METHODS AND RESULTS

Questionnaires were distributed yearly to delegates of all national societies of cardiology represented in the European Society of Cardiology. The goal was to collect the case numbers of all local institutions and operators. The overall numbers of coronary angiographies increased from 1992 to 2004 from 684 000 to 2 238 000 (from 1250 to 3930 per million inhabitants). The respective numbers for percutaneous coronary interventions (PCIs) and coronary stenting procedures increased from 184 000 to 885 000 (from 335 to 1550) and from 3000 to 770 000 (from 5 to 1350), respectively. Germany was the most active country with 712 000 angiographies (8600), 249 000 angioplasties (3000), and 200 000 stenting procedures (2400) in 2004. The indication has shifted towards acute coronary syndromes, as demonstrated by rising rates of interventions for acute myocardial infarction over the last decade. The procedures are more readily performed and perceived safer, as shown by increasing rate of "ad hoc" PCIs and decreasing need for emergency coronary artery bypass grafting (CABG). In 2004, the use of drug-eluting stents continued to rise. However, an enormous variability is reported with the highest rate in Switzerland (70%). If the rate of progression remains constant until 2010 the projected number of coronary angiographies will be over three million, and the number of PCIs about 1.5 million with a stenting rate of almost 100%.

CONCLUSION

Interventional cardiology in Europe is ever expanding. New coronary revascularization procedures, alternative or complementary to balloon angioplasty, have come and gone. Only stenting has stood the test of time and matured to the default technique. Facilitated access to PCI, more complete and earlier detection of coronary artery disease promise continued growth of the procedure despite the uncontested success of prevention.

The 2002 European registry of cardiac catheter interventions

OBJECTIVE

The tradition of yearly reports on cardiac catheter interventions in Europe has been initiated in 1992. This 11th report presents aggregated data on cardiac catheter procedures in 30 European countries in the year 2002.

DESIGN AND SETTING

A detailed questionnaire addressing summary data of all cardiac interventions was mailed to presidents or delegates of the national societies of cardiology in Europe. The questionnaire was distributed to all institutions with cardiac catheterisation programs. All questionnaires were compiled in a national summary data sheet, then entered into a central database and subsequently analysed.

MAIN OUTCOME MEASURES

Coronary angiography, PTCA, and stenting in absolute numbers and per million inhabitants in the participating countries and the whole of Europe.

RESULTS

Overall, 1,901,932 coronary angiograms were reported. The population-adjusted rate of coronary angiograms amounted to an absolute mean of 3358 per 10(6) inhabitants, an increase of 7% compared with 2001. A total of 686,869 PTCA procedures were reported. The mean European number of PTCAs per 10(6) inhabitants increased by 10% from 1103 in 2001 to 1213 in 2002. Procedures with stenting increased by 17% from 508,999 to 593,906. The stenting rate was 86% compared with 82% in 2001.

CONCLUSIONS

In pace with epidemiological demand and the need to catch-up from underuse in certain countries, a continuous and considerable growth of coronary interventions can be observed. It will take years to find out whether the announced change of paradigm in the treatment of multivessel disease in the wake of drug-eluting stents will come true.

Percutaneous coronary interventions in Europe 2000

AIMS

The purpose of this registry is to collect data on trends in interventional cardiology within Europe. Special interest focuses on relative increases and ratios in newer revascularization approaches and its distribution in different regions in Europe.

METHODS AND RESULTS

Questionnaires distributed to delegates of the national societies of cardiology represented in the European Society of Cardiology to be completed by local institutions and operators yielded that 1637148 angiograms and 525983 coronary angioplasty (PTCAs) were performed in 2000. This is an increase of 15% and 23%, respectively, compared with 1999, particularly due to increases in eastern European countries. The population-adjusted PTCA rate rose from 714 procedures per 10(6) inhabitants in 1999 to approximately 800 procedures per 10(6) inhabitants in the year 2000. Coronary stenting increased by 26% to about 395000 stented cases in 2000. Complication rates remained unchanged, the need for emergency coronary artery bypass grafting (CABG) further decreased to 0.2% per percutaneous intervention.

CONCLUSION

Interventional cardiology in Europe is still expanding, mainly due to rapid growth in countries with lower socioeconomical levels. Most central European countries reported only minor increases in procedures performed. Coronary stenting remains the only noteworthy adjunctive or alternative strategy to balloon angioplasty.

Trends in myocardial infarction treatment in subjects aged 35-64 in Southwestern France, 1986-93

BACKGROUND

The Southwestern region of France is characterized by a low mortality rate from MI. Since screening and management of the main cardiovascular risk factors has remained stable in this region, we hypothesized that any decrease in CHD mortality would be due to a better treatment of MI cases.

METHODS

Analysis of all MI treatments during hospitalization and at discharge collected between 1986 and 1993 in the Toulouse-MONICA register.

RESULTS

During the acute phase and at discharge from hospital, the prescription of beta-blockers and antiplatelet drugs increased whereas the prescription of calcium channel blockers decreased in men and women, although in women most trends did not reach statistical significance. In men, angioplasty increased steadily, whereas thrombolysis showed an increase followed by a slight decrease after 1991. After multivariate analysis adjusting for age, year, blood pressure, smoking status and personal history of coronary heart disease, women received significantly less beta-blockers and angioplasty and more calcium channel blockers and diuretics than men, while no differences were found for thrombolysis.

CONCLUSIONS

The prescription of the most efficient therapies against MI has increased in Southwestern France during the period studied. The reasons for a lower prescription of beta-blockers and angioplasty in women remain to be assessed.

Characteristics and outcomes among patients undergoing coronary artery bypass grafting in western Sweden and Minneapolis-St Paul, Minnesota

BACKGROUND

The purpose of this study was to compare patient selection, operative factors, and survival for coronary artery bypass grafting (CABG) for coronary heart disease in Minneapolis-St Paul (MSP), Minnesota, and Western Sweden (WS).

METHODS AND RESULTS

All patients from WS between 1988 and 1991 (n = 2365) and a 17% random sample of MSP patients between 1985 and 1990 (n = 1659) who underwent CABG surgery were studied. CABG was 3 times greater in MSP. MSP patients had significantly more obesity, cigarette smoking, prior CABG, and prior coronary angioplasty. WS patients had more and longer angina pectoris, better left ventricular function, and waited longer from previous acute MI until CABG. WS patients had more internal mammary artery graphs and a shorter aortic cross-clamp time. At discharge, WS patients received more beta-blockers and antiplatelet agents, whereas MSP patients received more calcium channel blockers and digitalis. Age-adjusted mortality rate at 28 days was significantly higher in MSP but not at 3 years. Adjustment for patient characteristics and treatment factors reduced or eliminated these differences.

CONCLUSIONS

Although coronary heart disease rates were higher in WS, age-adjusted CABG rates were 3-fold higher in MSP. Better survival among WS patients was associated with differences in patient selection and clinical and treatment characteristics because MSP patients were more severely ill and at increased risk. Health system characteristics and practice may account for these differences.

Poor prognosis of patients presenting with symptomatic myocardial infarction but without chest pain

OBJECTIVE

To describe the clinical features, prognosis, and treatment of patients presenting with atypical forms of acute myocardial infarction.

DESIGN

Consecutive cases of possible acute myocardial infarction were sought from coronary care registers, biochemistry records, and hospital management systems. Case notes were reviewed and predefined epidemiological and clinical variables were abstracted.

SETTING

20 adjacent hospitals in the former Yorkshire region.

PATIENTS

3684 consecutive cases of possible acute myocardial infarction admitted in a three month period were identified, of whom 2096 had a first episode of confirmed acute myocardial infarction.

RESULTS

20.2% of all patients admitted with an eventual diagnosis of acute myocardial infarction presented with symptoms other than chest pain. Compared with the group presenting with chest pain, these patients were older (76.6 v 69.1 years, p < 0.001), were more often women (54.6% v 35.3%, p < 0.001), and were more likely to have a history of heart failure (18.6% v 6.9%, p < 0.001). They had a higher 30 and 365 day mortality (49.2% and 61.0%, respectively) compared with patients presenting with chest pain (17.9% and 26.2%). In a Cox regression analysis the hazard ratio for presentation without chest pain was 1.60 (95% confidence interval 1.30 to 1.97) (p < 0.001) adjusted for age, heart rate, blood pressure, left ventricular impairment, and infarction with ST segment elevation as covariates. Importantly, they were also less likely to receive treatments with a proven ability to improve prognosis.

CONCLUSIONS

Atypical presentation of myocardial infarction without chest pain is common and associated with increased mortality. This may result in part from a failure to use beneficial treatment strategies.

Feasibility, safety, cost-effectiveness and 1 year follow-up of coronary stenting without predilation: a matched comparison with the standard approach

BACKGROUND

We evaluated the feasibility, safety, procedural cost-effectiveness, radiation dose and time and 1-year target vessel revascularization rate of direct unprotected mounted stenting without previous balloon dilatation (DS) in native coronary artery lesions.

METHODS

DS was attempted in 119 patients; 39 had a recent myocardial infarction, 62 had unstable angina, and 18 had stable angina. The clinical follow-up was obtained at 14+/-5 months (range 6 to 24 months). These results were compared with those for a consecutive group of 160 patients matched for type and length of lesions and who had a stent only if the post-balloon residual stenosis was >30%.

RESULTS

The feasibility of DS was 112/119 (94%). The number of inflations, the length of the stent/length of the lesion ratio, the time and the dose of radiation were dramatically lower in the DS group (P<0.001). DS conferred a slight reduction in procedure-related cost [$820+/-157 for DS vs. 894+/-427 for standard dilatation (SD) per patient]. The 1-year target vessel revascularization rate was similar in both groups [nine (8%) for DS vs. 17 (11%) patients for SD, ns].

CONCLUSIONS

DS is feasible and safe in selected coronary lesions. This method provides a low rate of repeat revascularization and reduces the time and the dose of radiation compared with the standard approach.

Hypothetical ratings of coronary angiography appropriateness: are they associated with actual angiographic findings, mortality, and revascularisation rate? The ACRE study

OBJECTIVE

To determine whether ratings of coronary angiography appropriateness derived by an expert panel on hypothetical patients are associated with actual angiographic findings, mortality, and subsequent revascularisation in the ACRE (appropriateness of coronary revascularisation) study.

DESIGN

Population based, prospective study. The ACRE expert panel rated hypothetical clinical indications as inappropriate, uncertain, or appropriate before recruitment of a cohort of real patients.

SETTING

Royal Hospitals Trust, London, UK.

PARTICIPANTS

3631 consecutive patients undergoing coronary angiography (no exclusion criteria).

MAIN OUTCOME MEASURES

Angiographic findings, mortality (n = 226 deaths), and revascularisation (n = 1556 procedures) over 2.5 years of follow up.

RESULTS

The indications for coronary angiography were rated appropriate in 2253 (62%) patients. 166 (5%) coronary angiograms were performed for indications rated inappropriate, largely for asymptomatic or atypical chest pain presentations. The remaining 1212 (33%) angiograms were rated uncertain, of which 47% were in patients with mild angina and no exercise ECG or in patients with unstable angina controlled by inpatient management. Three vessel disease was more likely among appropriate cases and normal coronaries were more likely among inappropriate cases (p < 0.001). Mortality and revascularisation rates were highest among patients with an appropriate indication, intermediate in those with an uncertain indication, and lowest in the inappropriate group (log rank p = 0.018 and p < 0.0001, respectively).

CONCLUSION

The ACRE ratings of appropriateness for angiography predicted angiographic findings, mortality, and revascularisation rates. These findings support the clinical usefulness of expert panel methods in defining criteria for performing coronary angiography.

Disease management and pharmacoeconomics as tools for mass prevention of hypertensive complications

Hypertension has been identified as a major predictor of cardiovascular disease, which is a worldwide cause of morbidity and premature mortality. Optimal management of hypertension involves finding a balance among the benefits, risks, and costs of disease treatment and prevention of hypertensive sequelae. Cost-effectiveness analysis helps to clarify the trade-offs between the costs and benefits of treatment and also to evaluate the effects on quality of therapy. Disease management programs that incorporate pharmacoeconomic analysis and computerized methods of targeting patients at high risk of hypertensive sequelae are useful and cost-effective tools. Critical to these cost-effectiveness analyses and disease management programs are the expected benefits attributable to blood pressure reduction. The utility of these programs in helping to determine which patients will benefit from intensive intervention depends to a great extent on the assumptions made and the quality of the data used for the analyses--that is, the degree to which the data are evidence based.

[Continuous practice and advanced training in interventional cardiology. Recommendations for the assessment and maintenance of proficiency in interventional cardiology. A statement for physicians and advanced training units from the Section of Hemodynamics and Interventional Cardiology of the Spanish Society of Cardiology]

This report reflects the interest of the Section of Hemodynamics and Interventional Cardiology of the Spanish Society of Cardiology in increasing quality, safety and applicability of percutaneous procedures, by giving scientific keys aimed at improving related functions of teaching or planning in this field and enhancing competence and prestige of Spanish interventional cardiologists. The purpose of the document is to describe the importance of current interventional cardiology, to identify quality references and to establish minimum acceptable requirements for assessing and maintaining the competence of practicing or providing advanced training in this discipline. To achieve this goal, a search for a gold standard of the different techniques of general interventional practice was carried out, and predictors of postprocedural outcome were analyzed, as well as their relation with different kinds of circumstances. This analysis identified coronary angioplasty as the standard on which recommendations regarding competence in overall interventional cardiology standards of quality and assessment and maintenance of proficiency must be based. On the other hand, the strong influence of experience and knowledge of results has been documented, especially in high-risk or high-complexity settings. On this basis, the report establishes specific recommendations about proficiency for practice and advanced training. It also suggests that interventional cardiology should be considered as a subspecialty, of cardiology requiring specific credentials.

Magnitude and consequences of error in coronary angiography interpretation (the ACRE study)

In the routine reporting of coronary angiograms, there are no contemporary estimates of the magnitude and consequences of interobserver variability. We therefore measured the agreement beyond chance between (1) the number of narrowed arteries on an angiographic report extracted from case notes and independent assessments by 2 cardiologists, and (2) actual patient management over an 18-month follow-up period and each cardiologist's hypothetical management proposal based on abstracted clinical details. Two hundred nine angiograms were randomly selected from 4,121 patients in a prospective study (Appropriateness of Coronary Revascularisation [ACRE study]). The number of narrowed arteries was defined using Coronary Artery Surgery Study (CASS) criteria. For the number of narrowed arteries, cardiologists A and B agreed with the angiographic report in 126 patients (60%, weighted kappa = 0.64) and 124 patients (59%, weighted kappa = 0.63), respectively. In a subset of 92 patients (44%) there was unanimous agreement on the number of narrowed arteries (both cardiologists agreed with the angiographic report). Comparing actual management (34 percutaneous transluminal coronary angioplasty and 39 coronary artery bypass grafting procedures on follow-up) with each of the cardiologist's management recommendations showed agreement in 150 patients (72%, kappa = 0.46) and 154 patients (74%, kappa = 0.48) for cardiologists A and B, respectively. These agreements on management improved (p = 0.05) for cardiologist B (but not A) when analysis was confined to the subset of 92 patients, showing agreement in 73 patients (79%, kappa = 0.60). Thus, in routine clinical practice, the agreement beyond chance in interpretation of the number of narrowed arteries was good. Disagreements on subsequent patient management arose as a result of, and independent of, errors in angiographic interpretation.

Clinical and angiographic follow-up after balloon angioplasty with provisional stenting for coronary in-stent restenosis

The objective of this study was to assess the angiographic and clinical outcome of patients with coronary in-stent restenosis treated with balloon angioplasty with provisional stenting. The study included 375 consecutive patients with in-stent restenosis managed with balloon angioplasty alone or combined with stenting. Clinical events were recorded during a 1-year follow-up period and quantitative analysis was performed on 6-month angiographic data. Of the 373 patients (451 lesions) with a successful procedure, 273 were treated with angioplasty alone and 100 with additional stenting. Target lesion revascularization was required in 23.7% of the patients: 20.7% in patients with angioplasty and 31.0% in patients with stenting. Angiographic restenosis rate was 38.9%: 35.8% in the angioplasty group and 47.7% in the stent group. Stenting in small vessels was associated with a much higher restenosis rate than in larger vessels (65.6% vs. 37.5%, respectively; P = 0.01). Thus, repeat balloon angioplasty with provisional stenting for in-stent restenosis is a safe treatment strategy associated with a relatively favorable long-term outcome. However, the long-term results might be improved if additional stenting is avoided especially in small vessels. Cathet. Cardiovasc. Intervent. 48:151-156, 1999.

Operator volume and outcome of patients undergoing coronary stent placement

OBJECTIVES

The aim of this study was to assess the relation between operator experience in coronary stent placement procedures and the clinical outcome of patients.

BACKGROUND

The results of coronary balloon angioplasty are closely related to the experience of the operator performing the procedure. Data on the effect of operator experience on the results after coronary stent placement are missing.

METHODS

The study included 3,409 consecutive patients undergoing coronary stent placement for the management of coronary artery disease. A composite end point of cardiac death, myocardial infarction and aortocoronary bypass surgery during the first 30 days after the intervention, was the primary end point and the procedural failure was the secondary end point of the study.

RESULTS

Adverse clinical outcome occurred in 2.99% of the 3,409 patients undergoing coronary stent placement. Procedural failure was recorded in 2.08% of the patients. Operator volumes above 483 procedures were associated with a risk-adjusted adverse outcome rate of 1.70%+/-1.28%, which is significantly lower than the overall rate of 2.99%. Operator yearly volumes of under 90 procedures were associated with a risk-adjusted adverse outcome rate of 4.59%+/-1.17%, which is significantly higher than the overall rate of 2.99%. The operator experience was an independent predictor even after adjusting for the effect of other risk factors. The analysis demonstrated that an experience of at least 100 procedures is required to obtain better outcome even in patients with simple coronary lesions and that operators should perform at least 70 procedures annually to expect a better outcome in patients with both simple and complex coronary lesions.

CONCLUSIONS

Operator experience is a significant and independent predictor of the outcome of patients undergoing coronary stent placement. An experience of at least 100 procedures and an annual volume of at least 70 procedures are required to ensure a significantly better outcome after coronary stent implantation.

Anaesthesia care and the adult cardiac catheterization patient

The number and types of procedures being performed in the adult cardiac catheterization suite have increased dramatically, with an aggressive move towards percutaneous interventional cardiac procedures. Here we review many of these procedures, including the current trends in North America and Europe. Coronary angioplasty is now more commonly performed than coronary artery bypass grafting. The past 5 years have seen a proliferation of coronary stenting procedures. Restenosis of coronary arteries continues to be a major area of research and concern.