Key result
Systemic arterial pressure primarily drives intracranial pressure, with venous effects appearing only when CVP increases.
In an acute lamb model, intracranial pressure changes are primarily driven by arterial blood pressure modifications, with venous influences only significant during increased central venous pressure.
Should not yet alter ICP management; leaves open human translation of arterial-dominant mechanisms.
In acute experiments on lambs, the effects of short-lasting induced modifications in arterial and venous systemic blood pressure on intracranial pressure have been studied. Haemodynamic changes have been provoked by increasing the cardiac venous return, by increasing or decreasing the arterial resistance and by stimulating the vagus nerve. Intracranial pressure modifications have been demonstrated to depend essentially on arterial influences. A direct venous influence is apparent only when the central venous pressure is increased, as occurs in the case of increased venous cardiac return.
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Pettorossi et al. (2008) studied this question. Induced modifications in arterial and venous systemic blood pressure was evaluated on Intracranial pressure modifications. Induced modifications in systemic blood pressure demonstrated that intracranial pressure changes depend essentially on arterial influences, with venous influence apparent only when central venous pressure increases.
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