The international ACTION-1 study on the optimal dosage of the anticoagulant heparin during
aorta surgeries has prematurely ceased to enroll new patients. The study investigated
whether a different method of administering heparin could lead to fewer complications in
patients. An interim evaluation has revealed that the study, initiated by the Dijklander
Hospital, can no longer achieve its goals.
The optimal dosage of heparin is unknown. In most cases, a standard dose of 5000 units is
given once. The effectiveness of heparin can be measured with a simple test, which assesses
the extent to which blood clots. This is called the Activated Clotting Time, or ACT. Up to now,
this has not been standard practice in arterial surgeries, though it is in all heart surgeries.
The study examined what the optimal dosage of heparin is. Patients either received the
standard dosage or a dosage determined by the ACT. It was expected that this study would
provide more insight into the optimal dosages of heparin, minimizing the patient’s risk of
complications.
Before the official ACTION-1 study began, a pilot study was conducted with 54 patients.
During this pilot study, no patients died, and it appeared that patients who received the
optimal heparin dosage determined by the ACT had fewer complications. It was expected
that the actual study would confirm this finding.
However, an interim evaluation of the definitive ACTION-1 study has now shown that the
group of patients whose dosage was determined by the ACT did not have more bleeding
complications than the group that received the standard dosage, but there were more
deaths in this group. Although there are no indications that the increased mortality is due to
the administered amount of heparin, this study will not be able to conclude whether it is
better to determine the dosage based on the ACT. Therefore, the study has prematurely
stopped enrolling new patients.
200 patients included
Start ACTION-1 study in Germany
On the 7th of December we received a very warm welcome by Professor Sebastian Debus and his team at the UKE Hamburg University Vascular Center. We are proud that one of the largest aortic centers of Europe is joining the ACTION-1 study from DLZ and Amsterdam UMC. It was impressive to receive a tour around all facilities, amazing high standards. We are looking forward to include the first patients. Thanks to Meral Ayhan and ‘Prüfarzt’ Karolina Malik as well.
100th patient included
On Monday the 13th of september we were able to include the 100th patient in our own Dijklander hospital. We celebrated the inclusion with a cake with ACTION-1 logo and champagne afterwards, together with the operation team and our other colleagues. We would like to thank all surgeons, anesthesiologists, PA’s and research nurses of all participating centers for their vital contribution to reaching this first milestone. On to the 750th!