We all recall the elegant curves that ostensibly show the neat relationship between mean arterial blood pressure (or CPP) and cerebral blood flow. This relationship classically has its lower and upper limits, beyond which CBF will vary passively with the systemic pressure. Stay within these limits and all is good, the mantra goes. However, as… Continue reading Cerebral Autoregulation – What do we know?
This is a subject that has been on our backburner for a while and it’s now due for a discussion on neuroscand.com. The use of beta-blockers in traumatic brain injury is nothing new. The indications have been largely centered on targeting and preventing paroxysmal sympathetic hyperactivity (PSH) and associated post-TBI autonomic phenomena. Please see our… Continue reading Beta-blockers and TBI
We have probably all struggled with these phenomena in our TBI patients in the neuro ICU: swinging blood pressures, episodic tachycardia and fever, occurring even several weeks after the initial traumatic event. In this article in the Lancet, Meyfroidt and colleagues offer us some insight into the clinical syndrome now known as paroxysmal sympathetic hyperreactivity.… Continue reading Lancet: Paroxysmal Sympathetic Hyperactivity after TBI – An Underrecognized Clinical Entity
Excellent review of asssessment of cerebral circulation by Donnelly et al. in Critical Care May 2016. The authors go through most of today’s available modalities and review their utility in neurocritical care. Find the article here.
It is widely accepted that hypotension in patients with traumatic brain injury is associated with poorer outcomes, as confirmed in a number of studies. But is there really a reliable cut-off for when we should be happy with a TBI patient´s blood pressure in a prehospital setting? A recent article in JAMA Surgery (Spaite et… Continue reading Prehospital BP and Mortality in TBI: Time to Reevaluate Our Haemodynamic Targets?
Published in 2011 by Schmidt et al (free full-text in Stroke), this article looks at CPP thresholds for cerebral hypoxia in SAH patients. They went through multimodal monitoring data for 30 patients with poor-grade SAH. Using microdialysis and brain tissue oxygenation as their main determinants of hypoxia, they found that patients with a CPP <70… Continue reading Cerebral Perfusion Pressure Thresholds for Brain Tissue Hypoxia and Metabolic Crisis After Poor-Grade Subarachnoid Hemorrhage
Published in NEJM 2016, the Antihypertensive Treatment of Acute Cerebral Hemorrhage II (ATACH-II) trial compared two BP-management regimes in intracerebral haemorrhage patients with hypertension (SBP>180 mmHg): Intensive lowering to SBP 110-139 mm Hg. vs. standard treatment to within the 140-179 mm Hg range. The trial was discontinued early after an interim analysis showed no difference between the groups in… Continue reading ATACH II Trial – No Benefit From Aggressive BP-lowering in ICH