SESSION TITLE: Medical Student/Resident Critical Care Posters SESSION TYPE: Med Student/Res Case Rep Postr PRESENTED ON: October 18-21, 2020 INTRODUCTION: Posterior reversible encephalopathy syndrome (PRES) is a clinical-radiographic condition of varied etiologies which typically involves the white matter of the posterior cerebral hemispheres. Posterior circulation vasogenic edema is seen on MRI. Although the full extent of PRES is not well understood, patients of all age groups have been affected. Features include hypertension, seizures, and altered consciousness. It is prudent to consider PRES in stroke patients who present with vision abnormalities and altered mentation. We present a case with symptoms of PRES in the setting of marijuana induced hypertensive encephalopathy. CASE PRESENTATION: A 41-year-old male with history of previous CVA, seizures, hypertension, and polysubstance abuse presented after being found with altered mentation. The patient remained agitated despite receiving sedatives, required mechanical ventilation for airway protection. His BP was 180/104. He is a chronic cannabis user. The patient’s previous CVA, 5 years ago, resulted after CO poisoning and hypertensive emergency with subsequent encephalopathy. MRI at that time showed acute infarcts involving b/l occipital, temporal, parietal lobes, & thalami resulting in posterior CVA/cortical blindness, with development of seizures. MRA demonstrated vertebral artery dissection. MRI on admission revealed development of subcortical white matter signal changes in the parieto-occipital and frontal white matter. These findings are suggestive of PRES in this hypertensive patient, suggesting that this is an unusual presentation of the consequences of his chronic THC use causing hypertensive encephalopathy with recurrent PRES. DISCUSSION: There are various pathogeneses for development of PRES. Our patient’s presentation 5 years ago suggests that there was a component of both hypertension and hypoperfusion from ischemic stroke. Normal autoregulation preserves cerebral blood flow through arteriolar constriction/dilatation. As BP increases, cerebral arterioles dilate causing increased cerebral blood flow and brain hyperperfusion causing breakdown of the blood-brain-barrier permitting extravasation of blood products into brain parenchyma. This vasogenic edema contributes to symptoms of PRES. His current presentation is more due to hypertension, believed to be marijuana induced. CVS effects of marijuana are tachycardia, hypertension, increased levels of carboxyhemoglobin. Cannabinoids bind to cannabinoid receptors, CB1-CNS and CB2-immune system. There are few cases of cannabis induced ischemic stroke & hypertensive encephalopathy associated PRES. It is important to highlight that marijuana can result in systemic complications. CONCLUSIONS: Although called posterior reversible encephalopathy syndrome, it is not always reversible. PRES should be considered in patients presenting similarly to evaluate with appropriate imaging and begin treatment based on the comorbidities of the patient. Reference #1: Qiang Zhang, George Richerson, Nandakumar Narayanan Neurology Apr 2017, 88 (16 Supplement) P4.066 Reference #2: Uhegwu N, Bashir A, Hussain M, Dababneh H, Misthal S, Cohen-Gadol A. Marijuana induced Reversible Cerebral Vasoconstriction Syndrome. J Vasc Interv Neurol. 2015;8(1):36-38. DISCLOSURES: No relevant relationships by Laith Al-janabi, source=Web Response No relevant relationships by Saad Chaudhry, source=Web Response No relevant relationships by Yashar Eshman, source=Web Response No relevant relationships by Padmini Giri, source=Web Response No relevant relationships by Victoria Gonzalez, source=Web Response
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