Neurocritical Care

, Volume 27, Issue 1, pp 3–10 | Cite as

Changes in Cerebral Perfusion with Induced Hypertension in Aneurysmal Subarachnoid Hemorrhage: A Pilot and Feasibility Study

  • Amanda Murphy
  • Airton Leonardo de Oliveira Manoel
  • R. Loch Macdonald
  • Andrew Baker
  • Ting-Yim Lee
  • Tom Marotta
  • Walter Montanera
  • Richard Aviv
  • Aditya Bharatha
Original Article



The effects of induced hypertension (IH) on cerebral perfusion after subarachnoid hemorrhage (SAH) are unclear. The objectives of this investigation are to: (1) determine whether there are differences in cerebral blood flow (CBF), cerebral blood volume (CBV), and mean transit time (MTT) measured with computed tomography perfusion (CTP) before and after IH; (2) evaluate differences in the presence of infarction and clinical outcome between patients with and without IH.


We performed a retrospective cohort analysis of 25 aneurysmal SAH patients. IH was initiated as per the standard institutional protocol when patients showed clinical symptoms of delayed cerebral ischemia (DCI). Differences in CBF, CBV, and MTT between early (<72 h after aneurysm rupture) and late (7–10 days after aneurysm rupture) CTP were quantified in patients with (n = 13) and without IH (n = 12). Outcome measures included cerebral infarction and clinical outcome at 3 months.


Early MTT was significantly greater in the IH group compared to the no-IH group. There was no difference in early or late CBV or CBF between the two groups. In patients that received IH, there was a significant decrease in MTT between the early (7.0 ± 1.2 s) and late scans (5.8 ± 1.6 s; p = 0.005). There was no difference in the incidence of infarction (5/13 vs. 2/11) or poor outcome (3/11 vs. 6/13) between the IH and no-IH groups, respectively (p > 0.05).


Elevated MTT is a significant factor for the development of DCI in patients eventually requiring IH therapy and is improved by IH treatment. Therapies to prevent DCI and improve clinical outcome may need to be initiated earlier, when cerebral perfusion abnormalities are first identified.


Subarachnoid hemorrhage CT perfusion Induced hypertension 


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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Amanda Murphy
    • 1
  • Airton Leonardo de Oliveira Manoel
    • 2
  • R. Loch Macdonald
    • 3
  • Andrew Baker
    • 4
  • Ting-Yim Lee
    • 5
  • Tom Marotta
    • 6
  • Walter Montanera
    • 6
  • Richard Aviv
    • 7
  • Aditya Bharatha
    • 6
  1. 1.Department of Medical ImagingUniversity of TorontoTorontoCanada
  2. 2.St. Michael’s HospitalTorontoCanada
  3. 3.Department of NeurosurgerySt. Michael’s HospitalTorontoCanada
  4. 4.Department of Critical CareSt. Michael’s HospitalTorontoCanada
  5. 5.Robarts Research InstituteLondonCanada
  6. 6.Department of Medical ImagingSt. Michael’s HospitalTorontoCanada
  7. 7.Department of Medical ImagingSunnybrook Health Sciences CentreTorontoCanada

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