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Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression
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Regulation of cerebral blood flow in health and disease

S Strandgaard1, O B Paulson

  • 1Department of Medicine and Nephrology B, Herley Hospital, Copenhagen, Denmark.

Journal of Cardiovascular Pharmacology
|January 1, 1992
PubMed

Insights

Hypertension impairs cerebral blood flow autoregulation, increasing hypotension risk. While generally safe, lowering blood pressure too aggressively in certain patients, especially those with acute stroke, can provoke cerebral ischemia.

Area of Science:

  • Neurology
  • Cardiovascular Medicine
  • Nephrology

Background:

  • Cerebral blood flow (CBF) regulation is crucial for brain health.
  • Hypertension and stroke significantly impact CBF dynamics.
  • Understanding CBF pathophysiology is vital for effective treatment strategies.

Purpose of the Study:

  • To review the normal regulation of cerebral blood flow (CBF).
  • To examine the pathophysiology of CBF in hypertension and stroke.
  • To identify clinical settings where antihypertensive treatment may provoke cerebral ischemia.

Main Methods:

  • Literature review of studies on cerebral blood flow regulation.
  • Analysis of pathophysiological mechanisms in hypertensive and stroke patients.
  • Synthesis of evidence regarding the impact of antihypertensive interventions.

Main Results:

  • In hypertensive patients without other health issues, absolute CBF remains normal.
  • Cerebral blood flow autoregulation shifts to higher pressures, reducing tolerance to hypotension.
  • Aggressive blood pressure lowering can precipitate cerebral ischemia in specific scenarios, including severe hypertension, elderly patients, and acute stroke.

Conclusions:

  • Antihypertensive treatment is generally beneficial for stroke prevention in hypertensive patients.
  • Caution is advised when lowering blood pressure in acute stroke due to complex ischemia-hyperemia dynamics.
  • In acute stroke, spontaneous blood pressure reduction may be preferable in the early phase.

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