Use of non-invasive cardiac investigations to predict clinical endpoints after coronary bypass graft surgery in coronary artery disease patients: results from the prognosis and evaluation of risk in the coronary operated patient (PERISCOP) study
Philippe Selliera,*,
Gilles Chatellierb,
Marie C. D'Agrosa-Boiteuxc,
Hervé Douardd,
Claude Duboise,
Pierre C. Goepfertf,
Catherine Monpèreg and
Alain Saint Pierreh on behalf of the investigators of the PERISCOP study
a Service de réadaptation cardiaque, Hôpital Broussais, 96 rue Didot-75014, Paris, France
b Département d'informatique hospitalière, HEGP, 20-40 Rue Leblanc, Paris, France
c Clinique Médicale cardio-pneumologique, 63830 Durtol, France
d Service de cardiologie, Hôpital cardiologique du Haut Lévèque, Avenue de Magellan 33604 Pessac, France
e Service de chirurgie cardiovasculaire, Hôpital Foch, 40 Rue Worth, 92151 Suresnes, France
f Département de Rééducation, Hôpital Brabois, Avenue du Morvan, 54500 Vandoeuvre lès Nancy, France
g Centre Bois-Gibert, BP 37510 Ballan-Miré, France
h Cabinet Médical, 1 Rue des Belges, 69006 Lyon, France
* Corresponding author. Tel.: +33-1-43-95-94-50; fax: +33-1-43-95-94-58
E-mail address: philippe.sellier{at}brs.ap-hop-paris.fr
Received 20 November 2002;
revised 14 January 2003;
accepted 14 January 2003
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Abstract
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Aims Little is known about which patients who have undergone coronary bypass surgery are at risk of future clinical cardiovascular events and may benefit from further medical treatment. We sought to determine if routine non-invasive cardiac investigations performed early after surgery were able to stratify the risk of cardiovascular events in this population.
Methods Two thousand and sixty-five consecutive patients were enrolled in a prospective multicenter study (PERISCOP). Exercise testing, echocardiography, and 24-h ambulatory ECG monitoring were performed at day 20±10 after coronary bypass surgery. Follow-up was performed 1 year after coronary bypass surgery. Causes of all hospitalisation and death occurring within 1 year were documented and classified by an End-point Committee. The principal endpoint was the combination of all-cause deaths and cardiovascular events requiring hospitalisation (myocardial infarction, unstable or severe angina, stroke, congestive heart failure).
Results The 1-year frequency of first events was 155 (8%). In multivariate analysis, exercise duration <420s (
; 95% CI: 1.132.49), exercise induced ST segment depression >1mm (
; 95% CI: 1.183.05), and left ventricular (LV) dysfunction (wall motion index <1.15) (
; 95% CI: 1.103.51) were independent predictors of cardiovascular events and deaths. Ambulatory ECG monitoring had no predictive value.
Conclusion Exercise testing and echocardiography performed early after coronary bypass surgery are able to identify high-risk patients who may benefit from intensive secondary prevention.
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1. Introduction
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Coronary artery bypass graft surgery is commonly used to treat patients with coronary heart disease, and has been shown to improve prognosis in patients with three-vessel coronary artery disease and those with left ventricular (LV) dysfunction.13 However, it is well-known that myocardial revascularisation does not completely protect the patient from future cardiac events. Some patients remain at high risk of fatal or non-fatal cardiovascular events during follow-up.4,5 Since several classes of drugs have a confirmed efficacy to improve prognosis in subgroups of coronary artery diseasepatients,6 it is therefore necessary to identify high-risk patients as soon as possible after coronary artery bypass graft to optimise treatment.
Non-invasive cardiac investigations includingexercise testing,79 24-h ambulatory ECG recording,10 LV function analysis by radionuclide angiography11, and ventricular late potential detection12 have identified patients at high risk of future cardiac events after recent myocardial infarction, thereby allowing physicians to adopt appropriate management strategies in these patients. However, there are limited data available to help physicians to distinguish between patients at high and low risk of future events following coronary artery bypass graft surgery. Previous studies conducted in patients before coronary artery bypass surgery have shown that long-term prognosis in post-CABG patients is related to age, number of coronary arteries involved, and LV function.4,5 However, prognostic evaluation before coronary artery bypass surgery may be inaccurate, especially given that the intervention itself would be expected to modify the prognosis,13 but not necessarily to the same extent in all patients. The few studies which have examined prognostic factors in post-CABG patients were conducted in small study populations lacking statistical power and designed to evaluate the prognostic value of only one non-invasive method at each time. In one study, the rate of cardiac events was 50% among 36 patients with persistent myocardial ischaemia detected by ambulatory ECG monitoring compared to 8% in those without ischaemia at 9-month follow-up,14 whereas ambulatory ECG monitoring findings had no predictive value in 79 patients with up to 10-year follow-up.15 In another study in 70 patients, moderate-intensity treadmill exercise test was also found to be ineffective to identify known prognostic factors such as current cardiac function and later graft status.16 But this study did not directly deal with prognosis. More recently, the ability of exercise thallium-201 scintigraphy to stratify risk after coronary artery bypass surgery was shown in two studies: in a prospective study of 873 symptom-free patients,17 as in a retrospective study of 411 patients within 2 years of coronary artery bypass surgery,18 both reversible thallium-perfusion defects and exercise capacity were strong and independent predictors of subsequent death or non-fatal myocardial infarction. However, the use of exercise thallium-201 scintigraphy to determine prognosis in a clinical setting is limited because it is not widely available and it is relatively expensive. Thus, the question of whether simple, non-invasive investigations can be used to identify post-CABG patients who would benefit from further medical treatment and more intensive management, and consequently reduce treatment costs in this population, remains open. The objective of our study was to determine prospectively in a large population of patients the prognostic value of widely available, relatively low-cost, non-invasive cardiac investigations which are routinely performed early after coronary artery bypass surgery.
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2. Methods
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2.1. Patients
The prognosis and evaluation of risk in the coronary artery operated patient (PERISCOP) study was a nationwide prospective multicentre cohort study. All patients who had undergone coronary artery bypass surgery within 20 days, had been referred to a cardiac rehabilitation centre, had no concomitant surgical interventions (valve replacement,aneurysm resection, carotid intervention), did not have an artificial pacemaker, or contraindication or inability to perform an exercise test, and were willing and able to participate in the follow-up 1 year after discharge were included in the study. Written informed consent was obtained from all study participants.
2.2. Sample size
According to the available literature, cardiovascular mortality in this population was estimated to be 1% per year.13 After a 1-year follow-up, 10 deaths for 1000 included patients were expected. Based on the results of the 4S study,19 we could expect four to five events requiring hospitalisation (myocardial infarction, acute coronary events, myocardial revascularisation) for one death. As a whole, 4050 major events for 1000 patients (a 45% event rate per year) were expected. According to Peduzzi et al.,20 the description of a valid multivariate statistical model requires at least 10 events per predictive variable. We therefore decided to include 2000 patients, giving between 100 and 120 major events requiring hospitalisation, and allowing us to describe a 10-variable predictive model.
2.3. Non-invasive cardiac evaluation
The PERISCOP study comprised three mandatory cardiac explorations, one symptom-limited exercise test, one 24-h ambulatory ECG recording, and one echocardiography. These three cardiac tests had to be performed between 10 and 30 days after coronary artery bypass surgery.
To validate LV function evaluation by echocardiography in comparison to reference radionuclide LV angiography, a sub-study was set up. In centres where appropriate equipment was available, LV function (ejection fraction) was also evaluated by radionuclide LV angiography under the same treatment and at a few days interval.
2.3.1. Exercise test
The exercise test was performed on an ergometric bicycle using the same standardised protocol. Briefly, the test began with a starting level of 30W, with a 10-W increase per minute. This symptom-limited test was stopped if the patient complained of angina, dyspnoea, or fatigue. In the absence of symptoms, the test was stopped according to the Recommendations of the European Society ofCardiology.21 The test was considered abnormal if at least one of the following characteristics was present: ST segment depression >1mm compared to baseline, horizontal or downsloping, measured 0.06s after J point, in leads V4, V5, or V6; frequent or complex premature ventricular contractions or runs of ventricular tachycardia; or drop in systolic blood pressure >10mmHg or absence of blood pressure increase during two successive stages.Exercise duration was recorded for each patient.
2.3.2. Echocardiography
LV systolic function was determined using the wall motion index (WMI), which has been previously validated22 as a method to estimate risk after myocardial infarction. The LV wall kinetics were evaluated in nine segments and a score between 1 and +3 was attributed according to the segmental ventricular wall motion and thickening.
2.3.3. Continuous 24-h ambulatory ECG monitoring
The following were considered abnormal: ischaemic episodes with ST segment depression >1mm in comparison to baseline, horizontal or downsloping, measured 0.06s after J point, for more than 60s, separated from the precedent one by more than 1min; ventricular arrhythmias with the number of premature ventricular contractions and episodes of ventricular tachycardia.
2.4. Data collection
At enrolment, participants were interviewed and underwent a complete clinical examinationperformed by the cardiologists participating in the study. Clinical data and results of the cardiac tests were recorded in a standardised case report form.
One year after coronary artery bypass surgery, a self-administered questionnaire was sent to all patients by the rehabilitation centres. Patients had to record detailed information about their clinical condition and the occurrence of any medical event leading to hospitalisation, and to send back this questionnaire to the rehabilitation centre. When a hospitalisation had occurred, the coordinating centre obtained all necessary information from the patient's cardiologist, general practitioner, or the admitting hospital (discharge summary, investigation reports, etc.). When a patient was lost to follow-up (no answer to the questionnaire), his family and the city hall of the town in which he was born were contacted to find out whether he had died. An End-point Committee comprising three trained senior physicians then validated and classified all events using a set of pre-defined rules. Finally, data were entered (double entry) in a computerised database for statistical analyses.
2.5. Study endpoints
The study end-points were all-cause deaths and non-fatal cardiovascular events (new or recurrent myocardial infarction, unstable or severe angina, stroke, congestive heart failure) requiring hospitalisation during the 1-year follow-up period. To avoid multiple statistical tests, the primary outcome measure was defined as the combination of all-cause deaths and the defined cardiovascular events. In patients with multiple events, only the first event was considered. All statistical analyses were performed using this composite end-point.
2.6. Statistical analysis
Statistical associations between occurrence of the outcome and prognostic variables were tested by Pearson's chi-square test for categorical variables and either t-test (Gaussian variables) or non-parametric tests (non-Gaussian variables) for continuous variables. The risk of all-cause deaths and cardiovascular events was estimated by the KaplanMeier method, and the significance of the difference between two survival curves was assessed by the logrank test. Multivariate analysis of associations between outcome and prognostic factors were done by Cox's proportional hazards model. We included all variables that were significant in univariate analysis, plus age and sex since these are usually strongly associated with the incidence of cardiovascular disease. We checked the proportional hazards assumption by plotting KaplanMeier curves. To comply with the hypothesis of proportional hazards, continuous variables were dichotomised using either standard thresholds (ST depression >1mm, LV ejection fraction <0.40) or the median value of the considered variable. Statistical analysis was performed using the Statview statistical software (Version 5.01, SAS Institute, Cary, NC, USA). A p value <0.05 was considered significant.
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3. Results
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3.1. General characteristics of the cohort
Between May, 1998 and February, 1999, 41 centres participated in the study. During this period, 2375 patients were screened and 2065 consecutivepatients were enrolled. The most frequent reason for non-inclusion was the impossibility to participate in the 1 year follow-up. Each centre included a median number of 25 patients (range 4136). The study design and general characteristics of the patients at inclusion have already beenpublished.23 These are summarised in Table 1. Indications for surgery were stable angina in 864 patients (42%), unstable angina in 736 patients (36%), recent myocardial infarction in 281 patients (14%), silent myocardial ischaemia in 187 patients (9%), and complication of coronary angioplasty in 54 patients (3%). Surgery was performed in emergency in 79 cases (4%). A history of previous myocardial revascularisation was found in 444 (21%) patients, either by coronary angioplasty in 381 patients (18%) or by coronary bypass surgery in 63 patients (3%).
All the 2065 patients underwent exercise testing, 2064 underwent ambulatory ECG monitoring, and 2024 had interpretable echocardiography. The mean interval between surgery and evaluation was 18.9±5.5 days for exercise testing, 21.1±12.0 days for echocardiography, and 19.9±5.9 days for ambulatory ECG monitoring. A total of 130 patients in seven centres underwent the optional evaluation of LV function (ejection fraction) by radionuclide LV angiography. Treatment at discharge is summarised in Table 2.
3.2. Incidence of events
The mean duration of follow-up was 412±64 days. The study flow chart is shown in Fig. 1. Among the 2065 patients, 42 (2%) did not respond to the follow-up questionnaire. Among these, vital status could not be traced in 22 (1%), and the remaining 20 were still alive. Among the patients followed according to the protocol, there were 35 deaths (1.7%). Eighteen were of cardiac origin, mainly due to sudden death
or heart failure
. Among the 17 non-cardiovascular deaths, 13 were due to cancer. Of the total of 159 events or deaths, 155 (8% of the total included population) were first events (Table 3).
3.3. Predictors of poor outcome
3.3.1. Univariate analysis
Among the clinical variables including sex, risk factors, history of myocardial infarction, and number of coronary vessels involved, only gender
, smoking habits (proportion of events 10 vs. 6.7%,
), and occurrence of a cardiovascular event before discharge from the rehabilitation centre (proportion of events 12.6 vs. 7.2%,
) were predictive of the 1-year incidence of death or non-fatal cardiovascular events. The results of initial non-invasive investigations in patients experiencing at least one end-point (group A) and in patients without end-point (group B) are compared in Table 4.
3.3.2. Exercise test
A large majority of the patients (1778: 86%) were receiving one or several antianginal therapy at the time of exercise testing (betablockers: 66%; calcium channel blockers: 32% nitrates: 16%; amiodarone: 17%). There was no significant relationship between the presence of exercise induced STdepression >1mm and a history of myocardial infarction. A positive exercise test was found in 119 out of 1312 patients (9%) without a history of myocardial infarction and in 56 out of 753 (7.4%) patients with a history of myocardial infarction
.
The rate of cardiovascular events and deaths at 1 year was 12.4% in the group of patients who had a positive exercise test (exercise induced ST depression >1mm) and 7.2% in those who had a negative test
. The prognostic value of exercise testing is summarised in.Table 4 Heart rate, systolic blood pressure at rest, and systolic blood pressure at peak exercise did not differ significantly between the two groups. The percentage of patients with exercise induced ST segment depression >1mm, abnormal systolic blood pressure response, and exercise duration differed significantly between group A and group B. When combining these exercise test abnormalities, the risk of cardiovascular events and deaths in patients with 0, 1, 2, and 3 abnormalities was 4.7, 8.3, and 17.5%, respectively
.
3.3.3. Echocardiography
There was a good correlation (Fig. 2) between the WMI determined by echocardiography and the reference radionuclide LV angiography (
,
,
). LV ejection fraction (LVEF) may be roughly estimated by the following equation: LVEF=6.51+(29xWMI). Using this equation, a WMI value of 1.15 corresponds to the usual 0.40 LVEF threshold defining a poor LV function. LV systolic function was significantly different between groups A and B
, but there was only a slight difference in LVEF between the two groups (Table 4).

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Fig. 2 Correlation between echocardiographic WMI and the reference radionuclide LVEF (validation study performed in 130 patients).
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3.3.4. Twenty-four hour ambulatory ECG monitoring
Heart rate (24-h average), number of premature ventricular contractions and the frequency of runs of ventricular tachycardia did not differ significantly between group A and B (Table 4). Although a trend towards the prognostic value of ischaemic episodes was found, the percentage of patients with ischaemic episodes did not differ significantly between the two groups.
The presence of ischaemic episodes on ambulatory ECG monitoring was significantly related to the presence of a positive exercise test (ST segment depression >1mm at peak exercise). The incidence of ischaemic episodes was 6.1% in case of negative exercise test, whereas it was 20.1% in case of positive exercise test
.
3.4. Survival curves
The median value of exercise duration (420s) was used as the cut-off point between long and short duration of exercise. The 1-year survival prognosis was significantly worse in patients with shortexercise duration
(Fig. 3), those with exercise induced ST segment depression >1mm
(Fig. 4), and those who had an abnormal systolic blood pressure response during the exercise test
(Fig. 5). Patients with a WMI <1.15 were also at higher risk
(Fig. 6).

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Fig. 3 KaplanMeier survival curve of the proportion of patients remaining free of cardiovascular events according to exercise duration (cut-off value: 420s).
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Fig. 4 KaplanMeier survival curve of the proportion of patients remaining free of cardiovascular events according to exercise induced ST segment depression (<1mm vs. >1mm in leads V4V6).
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Fig. 5 KaplanMeier survival curve of the proportion of patients remaining free of cardiovascular events according to exercise systolic blood pressure response abnormalities.
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Fig. 6 KaplanMeier survival curve of the proportion of patients remaining free of cardiovascular events according to WMI (cut-off value 1.15). LVEF, left ventricular ejection fraction.
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3.5. Multivariate analysis
The independent predictive value of the variables significantly associated with the risk of death or events was assessed using a Cox proportional hazard model. Gender and number of coronary vessels involved were forced into the modelalthough they were not associated significantly to the prognosis in univariate analysis. Only smoking habits, presence of a cardiovascular event before discharge from the rehabilitation centre, shortexercise duration (<420s), exercise induced ST segment depression >1mm, LV dysfunction (corresponding to an ejection fraction <0.40) were significantly predictive of the risk of cardiovascular events and deaths (Table 5).
In addition, since many of these factors have also been identified as prognostic factors in patients with myocardial infarction, we performed an unplanned analysis to evaluate the influence of a history of myocardial infarction on the model. Similar results were obtained in patients with and without such a history.
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4. Discussion
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Our large prospective study of patients who underwent coronary bypass surgery in France showed that early exercise testing (exercise duration, ST segment depression) is a useful method to identify those patients who were at high subsequent risk of death or non-fatal cardiovascular events. These results were obtained despite concerns raised about the validity of early exercise testing after coronary bypass surgery due to anaemia, fatigue, and pericardial effusion which are often present at this stage.24
This study also confirms the prognostic value of alteration in LV function, even if the impact on prognosis was limited in this study. This may be explained by the fact that our patient population had almost normal LV function (mean LVEF: 0.60) before coronary bypass surgery. This is consistent with the fact that the relationship between LV alteration and risk of death is incremental.11
On the contrary, we found that heart rate and frequency of arrhythmias during 24-h ambulatory ECG monitoring had no prognostic value in our study population. This may be accounted for by the fact that a majority of our patients (71%) were treated by betablockers. However, the presence of ischaemic episodes had an almost significant prognostic value of death or events. This finding seems to be in agreement with some studies performed in patients with recent myocardial infarction.10
Interestingly, variables traditionally related to an increased risk of future events in coronary artery disease patients, such as age, gender, and number of coronary arteries involved, had no independent prognostic value in our study. The absence of predictive value of age may be explained by the fact that the follow-up was limited to 1 year in this study and that most of the events occurred after 1 year in other studies.5 In contrast, the presence of events during the rehabilitation programme had a high predictive value, probably because this composite clinical variable reflects the expertise of the clinician which has already been emphasised in other studies.7
Studies of risk stratification in patients who have undergone coronary bypass surgery are rare. Most have been based on preoperative data.4,5,2527 In these studies, the significant prognostic factors were age, number of coronary arteries involved, and LV dysfunction. It is important to note that the event rate during the follow-up period of the PERISCOP study was similar to that observed in other published studies.5,28 Also, the few studies of the prognostic value of the presence of ischaemic episodes during 24-h ambulatory ECG monitoring after coronary bypass surgery concluded that this factor was unable to identify patients at high risk of cardiac events during follow-up.14,15 On the other hand, although exercise thallium-201 scintigraphy may identify patients at high risk of future cardiovascular events, this investigation is not widely available and was shown to increase the cost from US$553 to US$1285 per patient identified to be at high risk.17 Furthermore, poor exercise capacity was considered a much stronger predictor of death and major events than thallium-perfusion defects.17 Any comparison with the study performed by Miller et al.18 is hardly possible: first, this study was retrospective; second, the evaluation investigation (thallium-201 imaging) was performed later than in PERISCOP study (within 2 years after coronary bypass surgery). Interestingly, the author found that exercise variables alone were predictive of mortality and myocardial infarction.
In patients with recent myocardial infarction, risk stratification by exercise testing has shown the prognostic value of similar variables: short duration of exercise,9 occurrence of ST segment depression >1mm,7,8 exercise induced premature ventricular contractions, and abnormal systolic blood pressure response.9 The prognostic value of alteration in LV function has already been assessed in post-myocardial infarction patients, with an inverse relationship between LVEF and 1-year mortality.11 The LVEF threshold determined as a negative factor in the latter study was close to 0.40, a figure which was comparable in our study.
The prognostic value of ambulatory ECG monitoring after myocardial infarction is more controversial. The presence of ischaemic episodes is related10 or is not related29 to an increased risk of future cardiovascular events. The results of the present study show only a trend in favour of the prognostic value of the presence of ischaemic episodes after coronary bypass surgery. The presence of frequent premature ventricular beats has been shown to be an independent risk factor of total and sudden death in the large GISSI-2 trial involving 8676 patients.30 This was not found in the PERISCOP study, perhaps because only one-third (753) of the patients only had a history of myocardial infarction.
Our results are in keeping with those of Myers et al.,31 who showed that exercise testing, and particularly peak exercise capacity, was a stronger predictor of an increased risk of death than clinical variables or established risk factors in a population of patients with cardiovascular risk factors or established coronary artery disease.
4.1. Limitations of the study
Firstly, the inclusion of patients only at the beginning of a cardiac rehabilitation programme 1520 days after the intervention may have induced a bias because this study did not take into account the events which occurred during the first 2 or 3 weeks after coronary bypass surgery. However, the objective of the PERISCOP study was not to assess the short-term post-operative prognosis after coronary bypass surgery. And the rate of events occurring during the early post-operative period is limited, around 3% in the first month after coronary bypass surgery.5
Secondly, as the ability to perform an exercise test was an inclusion criterion, patients with the poorest prognosis may have been excluded from our study population. Patients unable to perform an exercise test are usually a high-risk group ofpatients.7 However, the percentage of coronary bypass surgery patients excluded for this reason was very low in the PERISCOP study (less than 1%) and may not bias the study.
Thirdly, the size of the population prevented a centralised analysis of cardiac investigations for logistic reasons and this may have induced a lack of precision in the results. However, all the cardiac investigations were performed in rehabilitation centres where these techniques are routinelyperformed by trained physicians. Moreover, any heterogeneity among investigators would only have decreased the value of the hazard ratio, and thus would not have masked any significantrelationships.
Fourthly, the follow-up period of the study was voluntarily limited to 1 year. So our study was unable to detect prognostic factors related to later events.
Furthermore, by using a self-administered questionnaire, we may have missed some events. However, the number of patients who did not answer to the questionnaire is very small (2%). And if we may have been missed some events, there is no reason to think that there is a relationship between missing events and the results of non-invasive evaluation.
Finally, the extent to which cardiac rehabilitation influenced the prognosis of our coronary artery disease patients after coronary bypass surgery could not be assessed because, to our knowledge, there is no evidence available in the literature to answer this question. However, all our patients underwent a similar cardiac rehabilitation programme at the same time after coronary bypass surgery. Furthermore, as coronary bypass surgery is widely accepted as an indication to cardiac rehabilitation, the conclusions of this study are fully applicable to the whole population of post-CABG patients.
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5. Clinical implications
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This study demonstrates that in post-coronary bypass surgery patients, low-cost, non-invasive evaluation, especially by exercise testing, can identify a subgroup of patients at high risk of future events. The risk of an event at short or medium term after coronary bypass surgery is still present, confirming that myocardial revascularisation does not completely protect the patient. Consequently, it is important to ensure that appropriate evidence-based medical therapy is used in all patients, and should be reinforced in those patients who are at highest risk of future events. The occurrence of cardiac events in coronary bypass surgery patients who are often already receiving medical treatment suggests that further improvement, especially in secondary prevention, is needed to achieve optimal management of these patients.
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Appendix A
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List of investigators: B. Avias (83406 Giens-Hyeres), J.M. Feige (84000 Avignon), J. Garaix (83407 Hyeres), M. Ferriere (34295 Montpellier), C. Rocca (38660 St Hilaire du Touvet), S. Frolichman (69565 Saint Genis Laval), K. Sourdais (23000 Sainte Feyre), M.C. D'Agrosa-Boiteux (63830 Durtol), H. Ducrot (42400 Saint Chamond), M. Bousquet (31650 Saint Orens de Gameville), J. Breton (82500Beaumont de Lomagne), J.L. Breda (66240 Saint Esteve), M. Fischbach (33150 Cenon), Pic (33950 Lege Cap Ferret), Borgat (44474 Carquefou), Pavy (44270 Machecoul), J.P Marty (17138 Puilboreau), J. Le Henaff (86021 Poitiers), Monnet de Lorbeau (41600 Lamotte-Beuvron), Monpere (37510 Ballan Mire), P. Guillo (35044 Rennes), L. Michel (29684 Roscoff), P. Sellier (75014 Paris), Fattell (91000 Evry), D.M. Marcadet (75116 Paris), O. Stechepinsky (50190 Saint Martin d'Aubigny), Belin (14360 Trouville sur mer), S. Corone-Alden (91640 Briis sous Forges), F. Larrazet (77174 Villeneuve Saint Denis), C. Cabanis (78605 Maisons Laffitte), C. Puechavy (78740 Evecquemont), P. Aeberhard (93200 Saint Denis), Dominique (80800 Corbie), P. Delelis (59160 Lomme), D. Souris (57038 Metz), J.J. Maureira (54201 Dommartin-les-touls), M. Ross (57560 Abreschviller), Kessler (57565 Niderviller), R. Grudet Bald (68460 Lutterbach), Verges (21000 Dijon), P. Poncelet (62590 Oignies).
Executive committee: P. Sellier, G. Chatellier, E. Dufour (Novartis Pharma), C. Dubois, A. Costa.
Scientific committee: P. Sellier (Chairman), C. Dubois, G. Chatellier, P.C. Goepfert, M.C. D'Agrosa-Boiteux, C. Monpère, H. Douard, A, Saint-Pierre.
End-point committee: A. Costa, C. Dubois, P. Sellier.
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Acknowledgments
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This study was undertaken by the Working Group on Functional Evaluation and Cardiac Rehabilitation of the French Society of Cardiology, with grant support from NOVARTIS PHARMA. We thank all the investigators who made this study possible. We also thank Mrs Pamela Johnson for reviewing the manuscript.
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Footnotes
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Funding: the PERISCOP study was supported by a grant from NOVARTIS PHARMA.
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