Based on moderate quality evidence , due to concerns about risk of bias and imprecision , initiation of statin therapy within 14 days following ACS does not reduce death , myocardial infa rct ion , or stroke up to four months , but reduces the occurrence of unstable angina at four months following ACS .
Serious side effects were rare
BACKGROUND The early period following the onset of acute coronary syndrome ( ACS ) represents a critical stage of coronary heart disease , with a high risk of recurrent events and deaths .
The short-term effects of early treatment with statins on patient-relevant outcomes in patients suffering from ACS are unclear .
This is an up date of a review previously published in 2011 .
OBJECTIVES To assess the effects , both harms and benefits , of early administered statins in patients with ACS , in terms of mortality and cardiovascular events .
Association of Statin Therapy with Outcomes of Acute Coronary Syndromes: The GRACE Study
Context While the benefits of statins in the primary and secondary prevention of coronary artery disease are clear , the value of statin therapy in acute coronary syndromes is uncertain . Contribution Analyzing data from a large , international observational study of acute coronary syndromes , these investigators identified associations between statin use before and during acute coronary events and favorable outcomes . Caution s While these data suggest a potential benefit of statins during acute coronary events , trials are necessary to determine the most appropriate use of statins in the treatment of acute coronary events . The Editors Data from r and omized clinical trials support the efficacy of lipid-lowering medications , particularly statins , in the primary and secondary prevention of coronary artery disease ( 1 - 3 ) . The benefits of statins , however , were not readily apparent until after several months of therapy , suggesting that the drugs ' lipid-lowering capabilities were largely responsible . In vitro work has suggested that statins may have an abundance of pleiotropic effects ( 4 ) . These include modulation of inflammation , inhibition of platelet function and thrombosis , and enhancement of endothelial cell function . The demonstrated ability of statins to immediately affect basic pathophysiologic mechanisms has result ed in increased interest in their potential role in the setting of acute coronary syndromes . The Myocardial Ischemia Reduction with Aggressive Cholesterol Lowering ( MIRACL ) trial found that early treatment with high-dose atorvastatin modestly reduced event rates of recurrent ischemia in statin-naive patients presenting with an acute coronary syndrome ( 5 ) . These observations , while intriguing , did not conclusively establish the role of statins in patients with acute coronary syndromes . In the MIRACL trial , the failure of statins to significantly affect more concrete trial end points ( for example , death or recurrent myocardial infa rct ion [ MI ] ) was disappointing . Whether this reflected a true lack of physiologic impact of early statin treatment or merely indicated that the study was underpowered to detect differences in these end points remains unclear . In a sub study using data from the Platelet Receptor Inhibition for Ischemic Syndrome Management ( PRISM ) trial in patients with acute coronary syndromes , patients already taking statins  had better short-term outcomes ( decreased risk for death or nonfatal MI ) than those not previously receiving statin therapy , unless statin therapy was discontinued in the hospital ( 6 ) . Initiation of statin therapy after the onset of an acute coronary syndrome appeared to be less effective than treatment with statins before symptom onset . Using data from the Global Registry of Acute Coronary Events ( GRACE ) project , a large , multinational , observational study of patients with acute coronary syndromes , we examined the association between previous statin therapy  , presentation characteristics of acute coronary syndromes , and hospital outcomes . We also examined the effect of early in-hospital statin therapy ( or withdrawal of statins ) on important hospital outcomes , including death or the development of recurrent MI or stroke . Methods Full details of the GRACE rationale and methods have been published elsewhere and are outlined below ( 7 - 9 ) . Site Selection The GRACE project is design ed to reflect an unbiased population of patients with acute coronary syndromes , regardless of geographic region . Currently , 94 hospitals located in 14 countries ( Argentina , Australia , Austria , Belgium , Brazil , Canada , France , Germany , Italy , New Zeal and , Pol and , Spain , the United Kingdom , and the United States ) are participating in this observational study . Patients entered in the registry must be at least 18 years of age and alive at the time of hospital presentation ; be admitted with an acute coronary syndrome as a presumptive diagnosis ( that is , have symptoms consistent with acute ischemia ) ; and have at least 1 of the following : electrocardiographic changes consistent with an acute coronary syndrome , serial increases in serum biochemical markers of cardiac necrosis , or documentation of coronary artery disease ( 7 - 9 ) . The qualifying acute coronary syndrome must not be precipitated by a significant noncardiovascular comorbid condition ( for example , trauma or surgery ) . To ensure the enrollment of an unbiased sample , the first 10 to 20 consecutive patients ( depending on each site 's patient volume ) are recruited from each site on a monthly basis . Where required , study investigators received approval from their local hospital ethics or institutional review board . Data Collection At each site , a trained coordinator collected data using a st and ardized case-report form . Data on demographic characteristics , medical history , presenting symptoms , duration of prehospital delay , biochemical and electrocardiographic findings , treatment practice s , and hospital outcome were collected . St and ardized definitions of all patient-related variables and clinical diagnoses were used . All cases were assigned to 1 of the following categories : ST-segment elevation MI , nonST-segment elevation MI , unstable angina , and other cardiac or noncardiac diagnoses that have been previously described ( 7 - 9 ) . St and ardized definitions were also used for selected hospital complications and outcomes . Patient Sample For the current study , patients who were subsequently found to have noncardiac or other cardiac ( nonacute coronary syndrome ) primary diagnoses and those who transferred into or out of GRACE registry hospitals were excluded from further consideration . Treatments defined as previous use were those taken by the patient on a long-term basis at home and within 7 days of the presenting event , based on the review of information contained in medical records and abstract ed by trained study physicians and nurses . Treatments received in the hospital ( within the first 24 hours or thereafter ) were categorized as within hospital . Agents prescribed for use after discharge from participating hospitals were categorized as at discharge . Patient treatment categories were defined according to the following groupings : no previous treatment with statins and no treatment with statins during hospitalization , no previous therapy with statins but statin therapy  instituted during hospitalization , previous therapy with statins and statin therapy continued during hospitalization , and previous  therapy with statins but statin therapy not continued during the index hospitalization . Statistical Analysis We used the chi-square tests for discrete variables to analyze differences in demographic and clinical characteristics , treatment practice s , clinical presentation ( ST-segment elevation vs. nonST-segment elevation , large infa rct [ creatine phosphokinase level > 2 times the upper limit of normal ] vs. small infa rct ) , subsequent diagnosis ( ST-segment elevation MI , nonST-segment elevation MI , unstable angina ) , and hospital complications ( death , congestive heart failure or pulmonary edema , cardiogenic shock , stroke , ventricular tachycardia or ventricular fibrillation , and cardiac arrest ) in relation to statin use . The Wilcoxon rank-sum test was used to analyze differences between respective comparison groups for continuous variables . While controlling for potentially confounding variables , we performed multivariate regression analyses to examine the association between previous statin therapy and hospital presentation ( ST-segment elevation vs. no ST-segment elevation , creatine phosphokinase level 2 times normal vs. creatine phosphokinase level < 2 times the upper limit of normal ) , as well as any association between previous or in-hospital statin therapy and hospital outcomes ( death , recurrent MI or MI after 24 hours , and stroke ) or a composite end point of all 3 outcomes . C and i date variables for inclusion in the regression models evaluating previous statin use and hospital presentation included patient age , sex , smoking status , diabetes , history of vascular disease ( previous MI , stroke , positive angiogram , peripheral vascular disease , percutaneous coronary intervention , or coronary artery bypass graft surgery ) , hypertension , hyperlipidemia , and previous therapies ( aspirin , angiotensin-converting enzyme [ ACE ] inhibitors , -blockers , and other lipid-lowering agents ) . C and i date variables for regression models evaluating previous or in-hospital statin use and hospital outcomes included all of the previously listed characteristics plus characteristics present at the time of hospital admission ( heart rate , systolic blood pressure , Killip class , ST-segment elevation or left bundle-branch block pattern , and positive cardiac enzymes ) and receipt of in-hospital therapies ( aspirin and other antiplatelet agents , -blockers , unfractionated heparin , low-molecular-weight heparin , glycoprotein IIb/IIIa inhibitors , cardiac catheterization , percutaneous coronary intervention , or coronary artery bypass graft surgery ) . C and i date variables possibly associated with the outcomes of interest ( P < 0.25 after univariate analysis ) were included in the multivariate models . Variables for which the P value exceeded 0.05 were eliminated in a stepwise fashion so that only those that had a statistically significant association with the outcome of interest were included in the final regression models . Because of their clinical relevance and potential importance , age , sex , and history of hyperlipidemia were retained in the final multivariable models for clinical outcomes regardless of statistical significance . Final models were evaluated for goodness of fit by the HosmerLemeshow test . Because between-hospital variation in use of statin treatment could be considerable and potentially affect our study results , we adjusted for hospital r and om effects on the observed outcomes . We used a generalized estimating equation modeling technique , assuming patients were repeated measures within each hospital . Variable
Based on moderate quality evidence , due to concerns about risk of bias and imprecision , initiation of statin therapy within 14 days following ACS does not reduce death , myocardial infa rct ion , or stroke up to four months , but reduces the occurrence of unstable angina at four months following ACS .
Serious side effects were rare
BACKGROUND The early period following the onset of acute coronary syndrome ( ACS ) represents a critical stage of coronary heart disease , with a high risk of recurrent events and deaths .
The short-term effects of early treatment with statins on patient-relevant outcomes in patients suffering from ACS are unclear .
This is an up date of a review previously published in 2011 .
OBJECTIVES To assess the effects , both harms and benefits , of early administered statins in patients with ACS , in terms of mortality and cardiovascular events .