Perioperative ischemia is a frequent event in patients undergoing major non-cardiac vascular or general surgery. This is in agreement with clinical, pathophysiological, and epidemiological evidence and constitutes an additional diagnostic therapeutic factor in the assessment of these patients. Form a clinical standpoint, it is well known that multidistrict disease, especially at the coronary level, is a severe aggravation of the operative risk. From a pathophysiological point of view, however, surgery creates conditions able to unmask coronary artery disease. Prolonged hypotension, hemorrhages, and haemodynamic stresses caused by aortic clamping and unclamping during major vascular surgery are the most relevant factors endangering the coronary circulation with critical stenoses. From the epidemiological standpoint, coronary disease is known to be the leading cause of perioperative mortality and morbidity following vascular and general surgery: The diagnostic therapeutic corollary of these considerations is that coronary artery disease – and therefore the perioperative risk – in these patients has to be identified in an effective way preoperatively.
Risk stratification before major vascular surgery is an everyday challenge for the clinical cardiologist. The prediction of events in this set of patients bears important implications, epidemiological, clinical and practical. In fact, the size of the problem is not negligible. Cardiovascular complications account for approximately half of all mortality after non cardiac surgery and are the leading cause of death in those patients . Moreover, patients with peripheral vascular artery disease have a higher chance of dying for cardiac and cardiovascular causes compared to patients with no peripheral vessel disease . When both severe and symptomatic peripheral vascular disease were present, the risk of death due to coronary artery disease was 10 to 15 times higher . In this set of patients the incidence of hard cardiac events (myocardial infarction and death) in the post-operative period is higher when compared to other type of non cardiac surgery. These patients are not only at risk for perioperative events, but they are also subject to late hard cardiac events.
The need of an effective risk stratification is to select patients in order to face safely the surgical procedure, by balancing the benefit of each procedure with the inherent risks. Once the aim of risk stratification is stated, i.e. the identification of patients with a high probability of experiencing a hard cardiac event, the criteria of selection have to be discussed.
Risk stratification: which patients?
The lack of controlled and randomized trials designed to assess the best strategy of stratification for patient evaluation before major vascular non cardiac surgery brought to the definition of guidelines by the American Heart Association/American College of Cardiology with the aim of: 1 – identify patients at extremely high risk in whom surgery should be canceled, or other less hazardous procedures should be considered; 2 – identify those patients in whom the optimization of medical therapy or a coronary revascularization before surgery might reduce the risk of the surgical procedure; 3 – identify those patients in whom an invasive and intensive monitoring might reduce the risk of perioperative events; 4 – assess the long-term risk of a future cardiac event. The available data of the literature show that clinical models of stratification in patients undergoing major vascular non cardiac surgery have a relatively low prognostic power [4, 5]. Nonetheless, it is a rational approach to avoid any form of risk stratification in asymptomatic patients with no history of coronary artery disease. On the other side patients with peripheral artery disease do not have this clear clinical presentation and might experience cardiac complications due to several reasons: 1 – many of the risk factors contributing to peripheral vascular disease (diabetes mellitus, smoking habit, dyslipidemia) are also risk factors for coronary artery disease; 2 – the usual symptomatic presentation for coronary artery disease in these patients may be obscured by exercise limitations due to advanced age or intermittent claudication; 3 – major arterial operations often are time-consuming and may be associated with substantial fluctuations in intra-extra vascular fluid volumes, blood pressure, heart rate. These considerations do not imply that all patients undergoing major vascular surgery should undergo risk stratification. The decision to recommend further stratification procedures in each single patient must take into account the probability of efficacy versus the potential risks. It is conceivable that during the stratification process the risks of tests or treatment might outweigh the potential benefits of the evaluation. Keeping in mind that the incidence of coronary artery disease in patients with peripheral vascular disease is around 60% and asymptomatic , preoperative screening might represent the first one for the assessment of a previously unsuspected coronary artery disease. Therefore, many patients will have their coronary artery disease diagnosed at the moment of the intervention whereas those with known coronary artery disease will benefit of an optimization of the medical regimen.
In the preoperative stratification the estimate of the surgery-specific risk is a relevant one. In fact, a patient undergoing laparoscopic surgery should be treated very differently from a patient undergoing vascular surgery. Vascular surgery with its high likelihood of underlying coronary artery disease and its high degree of hemodynamic cardiac stress with profound alterations in heart rate, blood pressure, vascular volume, bleeding, clotting tendencies represent an intermediate (1–5%) to high risk (>5%)  (Table I) procedure.
Risk stratification: Clinical evaluation
The assessment of the patient's clinical status should comprise the first step of risk stratification. As already stated, literature provides a wide range of clinical models for the prediction of preoperative risk. The prototype of all models is the one developed by Goldman which correlates clinical variables with post-operative cardiac events. In a multivariate analysis, nine parameters were found to be independent predictors of cardiac events. This analysis was used to develop a point system that could be used to predict risk. Progression from class I (lowest risk) to class IV (highest risk) was associated with an incremental increase in the percentage of patients with cardiac complications or cardiac death. Despite successful risk stratification in a general surgical population, the Goldman study has been criticized for the lack of considerations of cardiac symptoms. To this aim Detsky et al.  developed a model similar to the previous but more focused on cardiac symptoms. It also differed form Goldman's model in the use of the score for a Bayesan analysis to provide a post test probability of events. The AHA/ACC guidelines identify several clinical predictors of risk, in a severity scale (Table II), without providing a modeling of clinical stratification. Although, risk indexes have an important role in the patient's clinical evaluation, the presence of myocardial ischemia might be offset particularly in patients with peripheral vascular disease. Thus, risk classification based exclusively on clinical grounds may not prove to be as helpful when applied to vascular surgery patients . AHA/ACC  guidelines suggest a shortcut approach to a large number of patients in whom the decision to recommend testing before surgery can be difficult (Table III). Basically, if 2 of the 3 listed factors are true, the guidelines suggest the use of noninvasive cardiac testing as part of the preoperative evaluation. AHA/ACC guidelines recommend that no further cardiac evaluation is required if a recent (within 2 years) coronary angiogram failed to reveal the presence of significant obstructive coronary artery disease, or if bypass surgery was performed within the preceding 5 years, in the absence of anginal symptoms .
Risk stratification: which test is best?
Once, according to clinical variables, an intermediate to high risk of perioperative events is recognized for the individual patient it will be necessary to establish the presence, extent and severity of inducible myocardial ischemia, parameters which correlate with short and long-term prognosis in patients undergoing major vascular non cardiac surgery. Risk stratification with exercise electrocardiography has been performed [8–16], but this type of testing is not suitable for patients with peripheral vascular disease due to their inability to reach an ischemic threshold. Cutler et al.  demonstrated that patient who achieved >75% of maximum predicted heart rate and no ischemic electrocardiographic modifications did not develop postoperative cardiac complications, whereas there were 10 postoperative cardiac events, including 7 myocardial infarctions (25%), in the high risk group.
Other authors  have confirmed these data by showing that the failure to achieve 85% of maximum predicted heart rate or 5 metabolic equivalents is a predictor of poor outcome in vascular surgery patients. These data, consistently with the AHA/ACC guidelines stress the need for an adequate functional capacity to select high risk patients. Pharmacologic stress testing with perfusion scintigraphy or ultrasound, alternative to exercise is more suitable in this set of patients due to the aforementioned physical limitations. Myocardial perfusion imaging with dipyridamole has been used widely for the preoperative evaluation of patients before vascular surgery [17–24]. The positive predictive value of thallium redistribution ranged from 4% to 20% in reports that included >100 patients, but more recent studies have further reduced the positive predictive value of this method, likely due to the selection of high risk patients for whom an alternative approach is followed (coronary revascularization before peripheral surgery, optimization of medical regimen etc.). The negative predictive value of a normal scan remains high at 99% for myocardial infarction and/or cardiac death. Some studies have demonstrated that not only the presence but the magnitude and severity of the perfusion abnormalities correlated with a worse outcome, suggesting that more severe defects have a greater cardiac risk [22, 23, 25]. The meta-analysis by Shaw et al.  analyzed the results of 10 articles describing the use of dipyridamole-thallium in vascular surgery candidates over a 9-year period (1985–1994). Cardiac death or nonfatal myocardial infarction occurred in 1, 7, and 9% of patients with normal results, fixed defects, and reversible defects on thallium scans, respectively. Moreover, 3 out of the 10 studies analyzed have used a semi-quantitative scoring demonstrating a higher incidence of cardiac events in patients with two or more reversible defects . Recently Baron et al , raised the need for caution in routine screening with dipyridamole thallium stress test of all patients before vascular surgery. In this review of 457 patients undergoing elective abdominal aortic surgery, the presence of definite coronary artery disease and age greater than 65 years were better predictors of cardiac complications than perfusion imaging. In line with this evidence, Mangano  reassessing the use of perfusion scintigraphy, has shown its poor specificity mostly when applied to consecutive and unselected patients. In consideration of these data, some authors have stressed the need to select patients on clinical grounds first to obtain a better power of stratification when imaging techniques are used [7, 17, 28].
Many reports have demonstrated that pharmacological stress echocardiographic imaging techniques predict perioperative ischemic events in patients undergoing noncardiac vascular surgery [29–36]. The experience of several groups with either dobutamine or dipyridamole indicates, in univocal terms, that these tests have a very high negative predictive value (between 90 and 100%): a negative test is associated with a very low incidence of cardiac events and allows a safe surgical procedure. Much lower is the positive predictive value (between 25 and 45%). In the series by Poldermans et al.  the presence of a new wall motion abnormality was a powerful determinant of an increased risk for perioperative events after multivariate adjustment for different clinical and echocardiographic variables. In an update of the EPIC (Echo Persantine International Cooperative) Study – subproject risk stratification in major noncardiac vascular surgery, in a patient population of 509  it has been demonstrated that test positivity identified as the variation between rest and stress wall motion score index (delta peak wall motion score) was the best predictor of peri-operative in-hospital cardiac death. When the data were analyzed according to an interactive procedure, considering the variables in clinical order: historical parameters first, preoperative risk assessed on clinical grounds and stress echo parameters; still stress echocardiographic parameters added significant prediction to the model compared with historical and clinical variables. Published data, although less numerous than for perfusion scintigraphy, show that pharmacologic stress echocardiography is safe and effective in the risk stratification of this set of patients. In a meta-analysis of 15 studies  comparing intravenous dipyridamole-Thallium-201 imaging and dobutamine echocardiography for risk stratification before vascular surgery it has been demonstrated that the prognostic value of noninvasive stress imaging abnormalities for perioperative ischemic events is comparable between available techniques but that the accuracy varies with coronary artery disease prevalence (fig. 2). One study compares dipyridamole perfusion scintigraphy with dipyridamole stress echocardiography for the prediction of perioperative cardiac events . Sensitivity of the two techniques is not significantly different (scintigraphy vs. stress echo, 90% vs.68%, p = ns), while specificity as well as diagnostic accuracy are significantly better for stress echocardiography (88% vs. 68%, p < 0.001 and 84% vs. 72%, p = 0.02, respectively).
In a recent meta-analysis Kertai et al.  showed that pharmacologic stress echocardiography with dobutamine or dipyridamole is significantly better than perfusion scintigraphy in the prediction of perioperative events OR 37.1 (95% CI, 8.1 – 170.1) vs. 9.6 (95% CI 4.9 – 18.4, P = 0.12, dipyridamole vs. dobutamine) vs scintigraphy (OR 1.95 (95% CI, 1.2 – 3.2). On the basis of these data stress echocardiography has a prognostic profile comparable to perfusion scintigraphy, if not better. But these considerations should be put into a wider framework in the clinical decision making. In fact, medical imaging with nuclear techniques represents the main manmade source of radiations and its environmental impact should be considered along with the individual risk of each single patient of experiencing a fatal or non-fatal cancer" . On this issue a European Law states that a nuclear examination can be performed only when "it cannot be replaced by other techniques which do not employ ionizing radiations. This is one of those cases in which the nuclear technique can be clearly replaced without loss of critical information.
Risk stratification: Instructions for use
Once, on the basis of clinical and stress testing parameters, a patient has been recognized at high risk for future cardiac events, how to translate this information in clinical practice? In case of pharmacologic stress test negativity, because of its high negative predictive value, the surgical procedure might be undertaken safely. In case of test positivity different factors have to be taken into consideration. The stress echo response should not be read as a yes or not gate-keeper to vascular surgery. In fact, a stress echo response has different shades of severity, taking into consideration the time of appearance of the wall motion abnormalities (the shorter the time the higher the probability of an extensive coronary artery disease), the extent of wall motion abnormalities (a high number of the segments is related to an extensive disease), and the severity of the inducible dyssynergy . For dobutamine stress echocardiography the need to reach the target heart rate is another critical parameter for the stratification of the stress echo response .
Therefore, on the basis of these parameters, it is possible to grade the response and consequently the therapeutic approach to the patient, which is different from case to case since patients with a high risk stress echo result should undergo coronary angiography and postpone cardiac surgery. Many studies have investigated the need for a coronary revascularization before a noncardiac one, but there is no study addressing this issue prospectively and evaluating the impact of a prophylactic coronary revascularization on peri-operative or long-term morbidity and mortality. Retrospective studies have demonstrated that patients undergoing coronary bypass surgery have a low rate of mortality when undergoing noncardiac surgical procedures [43, 44]. In a sub-analysis of data from the Coronary Artery Surgery Study  it has been demonstrated that in 3368 patients undergoing urologic, orthopedic, breast and skin surgery the mortality rate was lower than 1% independently of a previous coronary revascularization. However, patients undergoing thoracic abdominal, vascular and head and neck surgery had a risk for death or myocardial infarction significantly higher in the first 30 days from surgery. In this set of patients undergoing high risk surgical procedures, a previous coronary revascularization reduced the incidence rate of death (1.7% vs. 3.3%, p = 0.03, revascularized vs. non-revascularized). Therefore, in assessing the risks and benefits of perioperative intervention strategy, risks associated with non-cardiac surgery must be individualized. In selected patient populations at very high risk, coronary revascularization should be taken into consideration, weighing the potential risk reduction with the additional one associated with cardiac surgery and evaluating the long-term implications of severe forms of coronary artery disease. Percutaneous revascularization procedures are a possible, when suitable, alternative with no clear evidence of their prognostic impact. Given the limited data, the indications for PTCA in the preoperative setting are identical to those developed by AHA/ACC guidelines for the use of PTCA in general . Nonetheless, this type of revascularization raise several practical problems for patient management. Stent thrombosis remains a very morbid event resulting in MI or death in the majority of patients in whom it occurs and related to the need to suspend antiplatelet treatment before surgery in order to avoid intraoperatory bleeding . Therefore, It appears reasonable to delay elective non-cardiac surgery for two weeks and ideally 4 weeks to allow for at least partial endothelization of the stent, but not for more than 6 weeks or 8 weeks, when restenosis begins to occur (if it is to occur) .
In case of a less severe stress echo response (small extent of ischemia and/or high dose positivity), it does not seem to be necessary surgery cancellation, but a more aggressive medical approach is warranted. Recent data show, the benefit associated with the use of beta-blockers in the postoperative period. Poldermans et al. have demonstrated that bisoprolol reduces the perioperative incidence of death from cardiac causes 3.4% vs. 17%; bisoprolol vs. placebo; p = 0.02) and nonfatal myocardial infarction (0% vs. 17%; bisoprolol vs. placebo; P < 0.001) in high risk patients (dobutamine stress echocardiography positivity) undergoing major vascular surgery . Subsequently, the total cohort of the study was reanalyzed, including those patients with no inducible ischemia at dobutamine stress echocardiography, showing that patients who had fewer than 3 clinical risk factors and taking beta-blockers had a lower risk of cardiac complications compared with those not taking beta-blockers (0.8% vs. 2.3%). In patients with 3 or more risk factors, those taking beta-blockers who had a dobutamine stress echocardiography demonstrating 4 or fewer segments of new wall motion abnormalities had a significantly lower incidence of cardiac complications (2.3% vs 10.6%). Among patients with more extensive ischemia on dobutamine stress echocardiography (5 or more segments), beta-blocking therapy did not offer protection for cardiovascular events . The protective effect of beta-blocking therapy is persistent in the long-term follow-up [49, 50].
In conclusion, not all patients should undergo risk stratification. The decision to recommend further testing for the individual patient has to take into consideration the estimated probabilities of effectiveness versus risk. It is possible that in the stratification process, the risks from the tests and treatments may offset the potential benefit of evaluation. Resources should be directed away from the unnecessary investigation of low risk individuals, towards improved perioperative management for those at high risk. Pharmacologic stress echocardiography appears to be a versatile tool in this set of patients and its use is warranted. No major technical advances have been made in order to reduce the inter-observer variability of the technique strictly linked to operator's experience but the search for an objective, operator-independent assessment of ischemia is on the run . To date, in the absence of prospective randomized trials, it appears reasonable to perform coronary revascularization before peripheral vascular surgery, in the presence of a markedly positive result of stress echo, and reserve only for those in whom it would be considered appropriate as part of their routine long-term care, and to adopt a more conservative approach – with a watchful cardiological surveillance coupled with through pharmacological protection – in patients with less severe ischemic responses during stress .
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Electronic supplementary material
Additional File 9: Additional file 9 movies.ppt: in the first slide is described a negative stress echo. In the left panel the images in 4 chamber view at rest, in the right panel 4 chamber view at peak stress. No change in regional function is detected. In slide 2, 3 and 4 a positive stress echo is described. In the left panel images in 4 chamber, 2 chamber and long axis view at rest are reported. No dyssynergy is present in resting conditions. In the right panels the same views are reported at peak stress. A clear apical and anterior septal dyssynergy is detectable. In slide 4 the angiographic view of the left anterior descending artery is reported in the right panel, the stenting procedure, and the angiographic result. (PPT 2 MB)
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Sicari, R. Perioperative risk stratification in non cardiac surgery: role of pharmacological stress echocardiography. Cardiovasc Ultrasound 2, 4 (2004). https://doi.org/10.1186/1476-7120-2-4
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