What about hemorrhagic stroke?
The study also evaluated functional outcomes for the whole population enrolled. “If we make the decision just based on thrombectomy-eligible patients, we may harm the rest of the patients, so we did this study to look at the whole population of severe stroke patients,” Dr. Ribo said.
Of the study population, 25% of patients were found to have had a hemorrhagic stroke.
“The problem is, at the prehospital level, it is impossible to know if a patient is having a large-vessel occlusion ischemic stroke or a hemorrhagic stroke,” Dr. Ribo explained. “We have to make a decision for the whole population, and while a longer transport time to get to a comprehensive stroke center might help a patient with a large-vessel occlusion ischemic stroke, it might not be so appropriate for patients with a hemorrhagic stroke who need to have their blood pressure stabilized as soon as possible.”
For the whole population, the mRS shift analysis at 90 days was also neutral, with an aHR of 0.965.
When considering only patients with hemorrhagic stroke, the adjusted hazard ratio for the mRS shift analysis at 90 days was 1.216, which was still nonsignificant (95% confidence interval, 0.864-1.709). This included a nonsignificant increase in mortality among those taken directly to a comprehensive center.
“If we had better tools for a certain diagnosis in the field, then we could consider taking large-vessel occlusion ischemic stroke patients to a comprehensive center and hemorrhagic stroke patients to the local stroke center, but so far, we don’t have this option apart from a few places using mobile stroke units with CT scanners,” Dr. Ribo noted.
Transfer times to comprehensive centers in the study ranged from 30 minutes to 2.5 hours. “There might well be a difference in outcomes for short and long transfers, and we may be able to offer different transfer protocols in these different situations, and we are looking at that, but the study was only stopped in June, and we haven’t had a chance to analyze those results yet,” Dr. Ribo added.
Complications during transport occurred in 0.5% of those taken to a local hospital and in 1% of those taken directly to a comprehensive center. “We were concerned about complications with longer transfers, but these numbers are quite low. Intubations were very low – just one patient taken to a local center, versus three or four in the longer transfer group,” he added.
For both local and comprehensive centers, treatment times were impressive in the study. For local hospitals, the average in/out time was just 60 minutes for patients who went to a comprehensive center; for patients receiving thrombolysis, the average door to needle time was around 30 minutes.
Time to thrombectomy in the comprehensive center for patients transferred from a local hospital was also very fast, with an average door to groin puncture time of less than 40 minutes. “This shows we have a very well-oiled system,” Dr. Ribo said.
“There is always going to be a balance between a quicker time to thrombolysis by taking a patient to the closest hospital but a quicker time to thrombectomy if patients are taken straight to the comprehensive center,” he concluded. “But in our system, where we are achieving fast treatment and transfer times, our results show that patients had timely access to reperfusion therapies regardless of transfer protocol, and under these circumstances, it is fine for the emergency services to take stroke patients to the closest stroke center.”