Navigation Links
ASA plus clopidogrel reduces heart attack risk in patients with acute coronary syndrome
Date:4/21/2009

In order to better prevent blood clots, clopidogrel can be prescribed to patients with acute ischaemia of the heart muscle, in addition to acetylsalicylic acid (ASA). The Institute for Quality and Efficiency in Health Care (IQWiG) has now investigated whether the combination of clopidogrel and ASA actually has a higher benefit for patients than ASA alone. The final report by IQWiG, published on 31 March 2009, concludes that combination therapy can measurably reduce the risk of a heart attack. This particularly applies if the 2 drugs are used in the early stage of treatment. An English-language summary of the report is now available.

ASA and clopidogrel should complement each other's effects

Clopidogrel is an anti-platelet drug ("platelet aggregation inhibitor") that is used in a similar way to ASA. It inhibits parts of the blood-clotting system, leading to a reduction in platelet clotting (aggregation) and of the subsequent formation of blood clots (thrombi). Clopidogrel thus reduces the risk of occlusion of the arteries and helps prevent heart attacks and strokes. However, the risk of bleeding increases. As the mechanism that affects blood clotting is slightly different from that of ASA, clopidogrel can also be used in combination with ASA in certain cases. It is assumed the 2 drugs complement each other and that the overall inhibitory effect on the formation of blood clots increases.

The combination of clopidogrel and ASA is approved in patients with acute coronary syndrome (ACS), i.e., with an acute stenosis of the coronary blood vessels. On the one hand, this refers to patients with an acute heart attack, which is shown in the electrocardiogram (ECG) as a characteristic elevation of the ECG wave between the "S" and "T" point (ST-segment elevation myocardial infarction, STEMI). On the other hand, it refers to patients with acute severe ischaemia of the heart, but without a heart attack and the typical ST-segment elevation in the ECG. Both types of patients must as a rule immediately receive medical treatment in a hospital.

Previously unpublished data included in the assessment

IQWiG identified a total of 7 randomized controlled trials in which the effects of clopidogrel plus ASA were compared with ASA monotherapy in patients with acute coronary syndrome and which focussed on patient-relevant outcomes. For 2 of these studies, not all necessary data were available in order to interpret their results reliably. They could thus not be included in the assessment. One of these studies (CREDO) was sponsored by the company Sanofi-Aventis, which developed clopidogrel and markets the drug. However, as both studies were relatively small, it is not assumed that they would considerably affect the conclusion of the report.

Of the remaining 5 clinical comparisons, only one referred to patients with ACS without ST-segment elevation. The other studies investigated patients with STEMI/ACS. Sanofi-Aventis provided all data requested by IQWiG for the 3 largest and most important studies. In this way, essential data previously inaccessible to the public could be incorporated into the assessment.

Patients with acute coronary syndrome without ST-segment elevation: clopidogrel plus ASA has no effect on mortality

The results of the only study that could be assessed in patients with ACS without ST-segment elevation provided proof that patients using combination therapy experienced fewer heart attacks. In this study patients were treated for up to 12 months. All-cause mortality was not reduced by the additional use of clopidogrel. At the same time, major bleeding complications occurred more often than with ASA monotherapy. It cannot be conclusively assessed, on the basis of the available data, how long it is meaningful for patients to use combination therapy in order for this therapy to be more beneficial than harmful. Specific studies are lacking here. Overall, however, patients seem to particularly benefit from combination therapy in the early phase of treatment.

Combination therapy in patients with STEMI/ACS can better prevent reoccurrence of a heart attack

The evidence base is clear regarding the reoccurrence of heart attacks in patients with STEMI/ACS. The data provide proof that the additional use of clopidogrel during the stay in hospital reduces the heart attack rate more strongly than ASA alone does. However, it has so far not been proven that these patients benefit from taking both drugs after leaving the hospital. In addition, the data also provide indications that combination therapy in patients with STEMI/ACS is also more successful regarding the prevention of a stroke.

In contrast to patients with ACS without ST-segment elevation, the additional use of clopidogrel in patients with STEMI/ACS could also have a beneficial effect on all-cause mortality. In the individual studies the results were inconsistent for this outcome; however, a meta-analysis showed a reduced mortality rate, which IQWiG evaluates as an indication of a benefit.

Patients with STEMI/ACS who use clopidogrel also experience bleeding complications more often; however, these are usually minor. The studies also show that the starting point of therapy is important for treatment success. The data provide indications that patients particularly benefit from combination therapy if treatment starts not later than 6 hours after the first occurrence of symptoms.

Procedure of report production

The preliminary results (preliminary report) were published by IQWiG at the end of September 2008 and interested persons and parties invited to submit comments. After the conclusion of the commenting procedure, the preliminary report was revised and the final report sent to the contracting agency, the Federal Joint Committee, at the beginning of February 2009. The documentation of the written comments will be published in a separate document simultaneously with the final report.

The executive summary provides an overview of the background, methods, and further results of the final report.


'/>"/>

Contact: Dr. Anna-Sabine Ernst
info@iqwig.de
Institute for Quality and Efficiency in Health Care
Source:Eurekalert

Related medicine news :

1. Daiichi Sankyo, Lilly Announce New Prasugrel Head-to-Head Phase III Study Against Clopidogrel
2. In Landmark Phase III Head-to-Head Study, Prasugrel Statistically Superior to Clopidogrel in Reducing Risk of Heart Attack
3. Half of patients undergoing cerebrovascular stent placement respond poorly to clopidogrel
4. Matrix registry probes adherence to clopidogrel at 1 year
5. Clopidogrel reloading worthwhile in acute coronary syndromes
6. AutoGenomics CYP 2C19 Test Used in Study to Personalize Clopidogrel (Plavix) Dosing in Patients
7. Prism Pharmaceuticals Study of Injectable Clopidogrel Accepted for Presentation at the American College of Cardiology
8. New study: Pine bark reduces perimenopausal symptoms
9. Different method of evaluating the urinary tract system reduces radiation dose
10. Saline Reduces Mortality for Brain Injury Patients
11. New study: Pine bark extract reduces ADHD symptoms in children
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/27/2017)... ... June 27, 2017 , ... Excel Medical, the leader in ... position of Executive Vice President, Sales and Marketing. Finnegan is a widely known ... device sales leadership. He has received industry recognition for innovations and new approaches ...
(Date:6/27/2017)... ... June 27, 2017 , ... DrugDev understands ... whether they can trust the sponsor to pay them correctly and on time. As ... CROs establish payment strategies that encourage sites to work on their studies. , At ...
(Date:6/27/2017)... ... June 27, 2017 , ... Salucro, the ... the health care industry’s hospitals and provider groups, has announced that it will ... customers. Parasail Health is a San Francisco health-finance startup that has launched a ...
(Date:6/27/2017)... ... June 27, 2017 , ... ... Association’s SUNucate efforts, Louisiana became the sixth state to pass legislation which ... Governor John Bel Edwards’ signature, Louisiana joins the states of Alabama, Arizona, Florida, ...
(Date:6/27/2017)... Beverly Hills, California (PRWEB) , ... June 27, 2017 , ... ... implants market has been projected to reach a staggering $6.81 billion by the year ... implants are rising at a faster rate than those made from titanium. Los Angeles ...
Breaking Medicine News(10 mins):
(Date:6/14/2017)... 14, 2017  ivWatch LLC, a medical device company ... (IV) therapy, is pleased to announce it was the ... Hospital Supplies and Equipment at the 2017 Medical Design ... medtech industry. The award was presented by Medical Device ... Center in New York during ...
(Date:6/14/2017)... -- In 2016, Embodied Labs took top prize ... came away with $25,000 in seed-fund investment. Embodied Labs ... "entering the life of another" and by the Journal ... medical professionals in an entirely new dimension." Building upon ... for the Department of Education,s EdSimChallenge, where they received ...
(Date:6/12/2017)... Kineta, Inc., a biotechnology company focused on the ... President of R&D and Head of Virology Kristin Bedard has ... the Northwest and Beyond meeting sponsored by Life Science ... from 8:30-10:30 AM PDT at the Agora Conference Center in ... Bedard will be joined by other leaders in infectious disease ...
Breaking Medicine Technology: