The purpose of the ALLEPRE trial is to compare the benefit offered by a structured, intensive and fully nurse-led intensive secondary prevention intervention programme with that offered by standard of care in a high-risk population of patients admitted to hospital because of an ACS.

ALLEPRE enrols a population of residents in Emilia Romagna with a diagnosis of ACS (unstable angina, non-ST segment elevation myocardial infarction, ST segment elevation myocardial infarction) who were admitted to the specialist cardiological departments of the participating centres up to 20 days after the index event.

All eligible patients are randomised 1:1 to the nurse-led intensive secondary prevention programme (ISPP: intervention/experimental arm) or usual treatment (UT: control arm).

Randomisation is centralised by means of IVRS under the responsibility of the Study Coordinator and the Principal Investigator at each hospital centre, and the patients are the allocated to groups by e-mail. Due to the nature of the study, neither participants nor research personnel can be blinded to the group assignments. The randomisation data are kept at the coordinating centre.

OPERATIVE PHASE After randomisation, all of the patients in both arms undergo a baseline examination and are required to return to their reference centre for follow-up visits after 12, 24 and 60 months for outcome assesment. Outcomes will also be recorded after 36 and 48 months on the basis of telephone enquiries.

ISPP: intervention arm. This consists of a series of programmed sessions involving the centrally trained nurses and the patients randomised to the ISPP. There will be a total of nine sessions: before discharge, and one, three, six, 12, 18, 24, 36 and 48 months after discharge. During the sessions, each of which will last for about one hour, the trained nurse will record the main clinical parameters (i.e. risk factors, lifestyle habits, adherence to therapy, and any discrepancies between patient reports and the recommended goals) using an ad hoc clinical file (SIM: scheda infermieristica multidimensionale or multidimensional nursing form), and then activate the interventions laid down by the pre-specified rules inside the SIM in order to correct the discrepancies. The activation of the pre-established multidisciplinary network (anti-smoking, anti-diabetes and anti-hypertension centres, and psychological support) is completely under the nurses' control.

Caregivers are encouraged to support the patients in achieving behavioural changes over time.

Adherence to the proven secondary prevention treatments is monitored using the Morisky scale in order to ensure that each of the following classes of cardioprotective medications are prescribed according to the guidelines at the doses used in clinical trials: antiplatelet therapy, beta-blockers, angiotensin-converting enzyme inhibitors or angiotensin II receptor blockers, and statins. The reasons for non-adherence also investigated in order to ensure more targeted interventions. The risk factor and lifestyle behaviour goals are to stop smoking, eat a healthy Mediterranean diet, undertake physical activity for at least 30 minutes/day on five days/week, and maintain a body mass index (BMI) of <25 kg/m2, systolic blood pressure of <140, LDL cholesterol levels of <70 mg/dL (1.81 mmol/L). A further goal for all diabetic subjects is good glycemic control.

The nurses also assess the subjects' psychological characteristics by means of a questionnaire that measures anxiety, depression, anger and hostility, type A and type D personality, perceived social support and perceived self-efficacy, and use an ad hoc questionnaire for referral to a psychologist if necessary.

To ensure the same nurse intervention in all partecipating centers the study started with a preliminary TRAINING PHASE involving professional nurses proposed by the participating centres (6-10 per centre, 50% from a hospital setting, 50% from a community setting). The training programme was coordinated by the Training and Continuous Education Centre of Parma University Hospital, and delivered by a multidisciplinary team of medical/nursing/psychological experts with the aid of ad hoc paper-based teaching materials. It consisted of three 8-hour sessions held on consecutive days during which the nurses were trained in secondary CVD prevention and how to take multi-dimensional and structured responsibility for ACS patients using appropriate communication strategies aimed at reducing risk factors, modifying lifestyles and improving adherence to prescribed pharmacological therapy. The programme was repeated four times in order to allow the creation of small groups (20 participants) and better interactions.

UT: control arm. The patients randomised to the control group will follow the standard for secondary prevention of the hospital to which they were admitted.

DATA MANAGEMENT All of the data are peripherally recorded in electronic case report forms and stored for further analysis. An external monitoring provides for all partecipating centrers the clinical data verification, the accuracy and the completeness of electronic case report forms.

Sample size and statistical aspects On the basis of the results of the GRACE UK-Belgian Study, it is conservatively expected that the cumulative rate of clinical endpoints in the standard care arm (cardiovascular mortality, non-fatal reinfarction, non-fatal stroke) during the five years' follow-up will be 28%. Using the formula of Lakatos and Lan (Statistics in Medicine, 1992), in order to detect a 25% risk reduction in the experimental group, with 90% power and a two-sided significance level of 0.25, at least 1030 patients are required in each group.

However, a two-year interim analysis of the major clinical endpoint will show the real divergence of the curves and provide further information for estimating the required duration of the study more precisely. The estimated sample size is also valid for the analysis of the first primary endpoint.

The plan of the primary and secondary analyses includes a Kaplan-Meier analysis of the time to an event, the HR, and log-rank comparisons based on the ITT and PP populations.

The baseline characteristics of the intervention and control group will be compared using the chi-squared test for categorical factors and Student's t test for independent samples for continuous factors. The data will be expressed as mean values ± standard deviations. All of the statistical analyses will be made using the SPSS programme.

A secondary heterogeneity analysis of the primary clinical outcomes will be made by stratifying the patients by age, sex, center, literacy level, diabetes, hypertension, smoking habits, family history, type of myocardial infarction (STEMI vs NSTEMI), and hospital characteristics. Analysis of repeated measures will be used to evaluate the changes in the primary surrogate end point over time.

Inclusion Criteria:

Eligible patients aged >18 years with an ACS (unstable angina, non- ST-segment elevation myocardial infarction [MI], or ST-segment elevation MI [International Classification of Diseases, Ninth Revision, Clinical Modification codes 41071, 41001, 41011, 41021, 41031, 41041, 41051,41061, 41081, and 41091]) who are admitted to the Cardiological Divisions of the 6 participating centers in Emilia-Romagna (Italy) are considered for enrolment for up to 20 days after the index event and before being discharged.

Exclusion Criteria:

Once it has been verified that the patients are capable of participating in a prospective study, the only exclusion criterion is a life expectancy of b12 months because of a severe noncardiac disease