Evaluation of Intracranial Pressure by Transcranial Doppler Ultrasonography in Dogs with Intracranial Hypertension.

Abstract

. Transcranial Doppler ultrasonography (TCD) has been used to confirm changes in cerebral hemodynamics. In this study, we investigated whether the parameters for the basilar artery measured by TCD were correlated with the intracranial and cerebral perfusion pressures in extreme intracranial hypertension. An intracranial hypertension model was produced in seven dogs by inflating a balloon inserted into the epidural space. The resistance index was compared with the corresponding intracranial pressure and cerebral perfusion pressure values during intracranial hypertension. A significant correlation was recognized between the resistance index and cerebral perfusion pressure. Therefore, measurement of the basilar artery by TCD in the dog with intracranial hypertension is useful in estimating the intracranial circulation in cases where the measurement of intracranial pressure is not available or not indicated.-KEY WORDS: canine, intracranial hypertension, transcranial Doppler ultrasonography.

Transcranial Doppler Ultrasound Examination in Dogs with Suspected Intracranial Hypertension Caused by Neurologic Diseases

“…After B‐mode examination with a sagittal view, color flow Doppler was performed to identify the basilar artery (Fig A). The basilar arterial Doppler waveforms were obtained using 6.0‐kHz pulse repetition frequencies, a 94‐Hz wall filter, 2.5‐mm sample width, and angular correction at <40 degrees . The obtained Doppler waveforms were recorded with simultaneous electrocardiograms, and then manually traced to determine the TCD variables, including peak systolic velocity (PSV), end diastolic velocity (EDV), mean velocity (Vm), systolic mean velocity (Sm), and diastolic mean velocity (Dm).…”

“…In veterinary medicine, the RI was reported to be correlated with intracranial pressure measured directly in experimental intracranial hypertension . However, there have been no reports of the clinical usefulness of TCD in the diagnosis of intracranial hypertension in dogs.…”

Small breed dogs with confirmed stroke: concurrent diseases and sonographic findings

“…Although the deposition of atheromatous plaques does not happen naturally in the aging process of the dog, it is known that animals which have diseases that lead to changes in cholesterol metabolism may have vascular stenosis similar to that which occurs in humans (Pattersen et al, 1985;Joseph et al, 1987;Braund, 1994;Garosi, 2010). These promote vascular stenosis in several degrees (Burgin et al, 2000) and can be detected by Doppler spectral (Nagai et al, 1997;Fukushima et al, 2000;Saito et al, 2003;Carvalho et al, 2007;Carvalho et al, 2010a;Carvalho et al, 2010b). ).…”

Comparação entre imagens ultrassonográficas do cérebro do cão com e sem a calota craniana e sua correlação com a anatomia real

“…In the topography of interthalamic adhesion in dogs, the lateral ventricles are considered increased when they are larger than 0.35 cm in its dorsoventral axis (transversal section) 5,15 . In the veterinary literature, few reports are found on the use of US in the diagnosis of other brain disorders, such as neoplasms 9,12,13,14,16 , cysts 17 , abscesses 13,18 , congenital malformations 20 , inflammatory 19 , hemorrhagic or ischemic 21,22,23 processes. There are citations on its intraoperative use 13,16,24,25,26 and as a guide for biopsies in the brain 12,27 .…”