Establishment of an intracerebrai hemorrhage model under the ultrasonic guidance

Objective To explore a method of establishing a canine model of intracerebral hemorrhage (ICH) by puncturing the main branch of middle cerebral artery (MCA) under ultrasonic guidance and proceed a pilot study of contrast-enhanced ultrasound (CEUS) of ICH.Methods Twelve adult healthy mongrel dogs were enrolled in the experiment.In the condition of bone window,the main branch of MCA was punctured to bleed under the ultrasonic guidance.CEUS of brain was performed every 30 minutes until hematoma formed and another CEUS was performed at 24 hours.Then brains were collected for pathologic examination after dogs were euthanized.Results Eleven of twelve dogs developed ICH successfully that located in the Out edge of basal ganglia,which was confirmed by CEUS and autopsy.One dog died within 6 hours due to intraventricular hemorrhage which was confirmed by autopsy.The hematoma diameters were measured as (22.4 ± 7.1)mm by CEUS before euthanasia and as (21.6 ± 6.9)mm on autopsy.There was no significant difference between the two methods of measurement (t =1.521,P =0.1565).The characteristics of active bleeding and hematoma on ICH were performed in the CEUS imaging.Conclusions A model of dog ICH by puncturing the main branch of MCA under the guidance of ultrasound was established successfully,and it proved to be simple,effective and repeatable.The imaging characteristics of this model are in good accordance with those of ICH in patients. Key words: Ultrasonography; Microbubbles; Cerebral hemorrhage; Models,animal