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Barcelona, Spain, 31 August 2009: Primary angioplasty is superior to thrombolysis in the treatment of very old patients with acute myocardial infarction (AMI), according to results from the TRIANA (TRatamiento del Infarto Agudo de miocardio eN Ancianos*) study, a randomised trial sponsored by the Spanish Society of Cardiology.**
The trial was designed to compare the two principal available treatments to open blocked coronary arteries in AMI patients: immediate primary PCI with angioplasty, and thrombolysis with clot-dissolving drugs. The trial was performed in 226 patients all aged 75 years or older and all with AMIs of less than six hours’ evolution. They were recruited in 23 Spanish hospitals between 2005 and 2007.
The study, which was closed prematurely because of slow patient recruitment, found no differences between the two groups in its primary endpoint ― the incidence of death, reinfarction or disabling stroke at 30 days (25.4% in the thrombolysis group and 18.9% in the primary angioplasty group, p=0.21). Despite the higher-than-anticipated rate of events in both arms, the study became underpowered to detect such differences because of its reduced recruitment. However, in a pre-specified secondary endpoint there was a significantly lower need of new catheterisation for recurrent cardiac ischemia in the primary angioplasty arm (0.8% versus 9.7%, p<0.001).
Reviewing the findings principal investigator Professor Héctor Bueno from the Hospital General Universitario “Gregorio Marañón” in Madrid reported that:
• the effect of primary angioplasty on reducing recurrent ischemia was so strong that it could still be easily detected in the study, despite its limited statistical power • contrary to what might have been anticipated, there was no clear evidence that thrombolysis, which is considered controversial in older patients because of their increased bleeding risk, was unsafe in a population whose median age was 81 years; the study found no intracranial bleeding directly related to the use of thrombolysis, and no significant differences between groups in major bleeding (4.5% versus 3.8%; p=0.78), or need for transfusions (3% vs 5.3%, p=0.35) • and similarly, there was no increase in renal failure associated with primary angioplasty (6.1% versus 7.5% with thrombolysis), a feared complication of catheterisation in older patients
Professor Bueno added: “All efficacy outcomes showed concordant trends in favour of primary angioplasty, suggesting that the potential advantage of an invasive strategy over thrombolysis in very old patients is because of its greater efficacy rather than its superior safety. However, patients in both groups tended to have a comparable prognosis one year later.” - Ends -
* Treatment of acute myocardial infarction in the elderly. ** The TRIANA study was funded by the Fondo de Investigaciones Sanitarias (Instituto Carlos III, Ministry of Health, Spain), and unrestricted grants from Sanofi, Medtronic, Boston Scientific, Guidant, and Johnson & Johnson.
This press release accompanies both a presentation and an ESC press conference given at the ESC Congress 2009. Written by the investigator himself/herself, this press release does not necessarily reflect the opinion of the European Society of Cardiology.
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