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Background  Transcranial Doppler ultrasound examination ( TCD ) is a rapid, noninvasive technique used to evaluate cerebral blood flow and is useful for the detection of intracranial hypertension in humans. However, the clinical usefulness of  TCD  in diagnosing intracranial hypertension has not been demonstrated for intracranial diseases in dogs.    Objectives  To determine the association between the  TCD  variables and intracranial hypertension in dogs with intracranial diseases.    Animals  Fifty client‐owned dogs with neurologic signs.    Methods  Cross‐sectional study. All dogs underwent  TCD  of the basilar artery under isoflurane anesthesia after magnetic resonance imaging ( MRI ). Dogs were classified into 3 groups based on  MRI  findings: no structural diseases (group I), structural disease without  MRI  evidence of intracranial hypertension (group  II ), and structural disease with  MRI  evidence of intracranial hypertension (group  III ). The  TCD  vascular resistance variables (resistive index [ RI ], pulsatility index [ PI ], and the ratio of systolic to diastolic mean velocity [Sm/Dm]) were measured.    Results  Fifteen, 22, and 13 dogs were classified into groups I,  II , and  III , respectively. Dogs in group  III  had significantly higher Sm/Dm (median, 1.78; range, 1.44–2.58) than those in group I (median, 1.63; range, 1.43–1.75) and group  II  (median, 1.62; range, 1.27–2.10). No significant differences in  RI  and  PI  were identified among groups.    Conclusions and Clinical Importance  Our findings suggest that increased Sm/Dm is associated with  MRI  findings of suspected intracranial hypertension in dogs with intracranial diseases and that  TCD  could be a useful tool to help to diagnose intracranial hypertension.

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