New research from University of Alberta cardiologists suggests that treating one of the most serious types of heart attack with clot-busting drugs along with the current primary treatment may lead to better health outcomes for patients.
When a patients coronary artery is completely blocked, cutting off blood to a large part of the heartwhich is an ST-segment elevation myocardial infarction, or STEMIthe primary treatment is to insert a balloon catheter into the blocked vessel to expand it and restore blood flow.
Interventional cardiologist Kevin Bainey and his team reviewed data from more than 5,000 Edmonton-area patients between 2006 and 2016 who were admitted to hospital for STEMI-type heart attacks.
They concluded that a treatment strategy using clot-busting drugs early in combination with the balloon-catheter procedureknown as a pharmacoinvasive approachwas more effective than patients being rushed directly for the balloon-catheter procedure, called primary percutaneous coronary intervention or primary PCI.
This goes against the grain in terms of what everyone believes, said Bainey, who is also an associate professor of medicine in the Division of Cardiology.
The prevailing belief is that the primary PCI approach is better than a pharmacological approach, and that the pharmacological approach has a higher risk of internal bleeding. But our data show, for the first time in literature, that not only is a selected pharmacological approach just as good, its better with no difference in major bleeding.
In Baineys study, published in Circulation: Cardiovascular Interventions, the team analyzed data from the Alberta Vital Heart Response Program, an Alberta Health Services program that collects information on all STEMI patients admitted to Edmonton-area hospitals from northern Alberta. The information includes whether a patient was administered any clot-busting drugs before arriving at the hospital, or if they received primary PCI treatment only.
The team compared patient outcomes between the two approaches, including whether patients had additional heart problems in the year after treatment, suffered side-effects such as major bleeding, or ultimately died.
They found that STEMI patients treated with clot-busting drugs using the pharmacoinvasive approach had better overall outcomes than patients treated with primary PCI only.
Weve also designed a pharmacoinvasive strategy where patients over the age of 75 are given a half-dose of drugs in the ambulance, and thats something no one else in the country is doing, Bainey said.
We found that it seems to work just as well as the full doseand reduces the risk of adverse side-effects such as bleeding in the brainand thats really exciting. It leads to the bigger question of, Does the half-dose strategy work for all people, and can we lower the threshold age from 75 to maybe 60?
Though hes excited by the results, Bainey said hes not entirely surprised. He noted Edmonton is one of the few regions that strongly endorse a pharmacological approach when treating STEMI patients, with paramedics allowed to administer drugs in the ambulance in consultation with a cardiologist. He believes this is one of the reasons Edmonton has the lowest mortality rate for heart attacks in Canada.
Our approach in Edmonton has been to give clinicians the opportunity to choose the right therapy for the right patient, he said. In other systems of care, theres only one option, which is primary PCI.
Bottom line: If you're going to have a heart attack, its probably best to have it in Edmonton.
Bainey is hopeful the studys findings will encourage more health experts across the country to include a pharmacoinvasive approach in the treatment of STEMI patients.
Its almost too coincidental that the lowest mortality in the country for a heart attack is in Edmonton, he said. We know there are patients in Canada that could potentially benefit from this approach, but they cant because its not built into their system of care.
Baineys research was partially funded through the Alberta Strategy for Patient Oriented Research Support Unit and Alberta Innovates, and was supported by the Canadian VIGOUR Centre.
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Treating heart attacks with clot busters leads to better outcomes, U of A researchers find - Folio - University of Alberta
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