Chapter 62: Managing Cerebrovascular Disorders

Managing Cerebrovascular Disorders nursing chapter thoroughly examines the multifaceted management of cerebrovascular disorders, focusing primarily on stroke, which remains a leading cause of long-term disability and the fifth leading cause of death in the United States. Cerebrovascular disorder is defined as a functional abnormality of the central nervous system resulting from compromised cerebral blood supply. Strokes are categorized into two major types: ischemic strokes, accounting for approximately 87%, caused by vascular occlusion resulting in hypoperfusion; and hemorrhagic strokes, accounting for about 13%, caused by extravasation of blood into the brain tissue or subarachnoid space, often stemming from intracranial aneurysms or arteriovenous malformations (AVMs). Ischemic strokes are subclassified based on etiology, including large artery thrombotic, small penetrating artery (lacunar), cardiogenic embolic (frequently linked to atrial fibrillation), cryptogenic, and strokes from other causes like COVID-19 or illicit drug use. Ischemic stroke initiates an ischemic cascade where cerebral blood flow reduction (lesser than) 25 mL per 100 g/min forces anaerobic respiration, leading to cellular pump failure and the ultimate destruction of the brain's penumbra region—ischemic tissue that may otherwise be salvaged. This emphasizes the concept of stroke as a "brain attack" and the urgency for rapid diagnosis via noncontrast computed tomography (CT) scan. Acute medical management for eligible patients involves rapid administration of the thrombolytic agent recombinant tissue plasminogen activator (t-PA) within the therapeutic window (typically 3 to 4.5 hours of onset), with a goal of administration within 45 minutes of emergency department arrival. Endovascular therapy, such as mechanical thrombectomy using a stent retriever, is also recommended for patients meeting specific criteria, including treatment initiation (groin puncture) within 6 hours of symptom onset. Prevention is critical, focusing on modifying risk factors such as hypertension (the major risk factor), diabetes, smoking, and dyslipidemia, along with surgical options like carotid endarterectomy (CEA) or carotid artery stenting (CAS) for carotid stenosis. Nursing management for the patient recovering from an ischemic stroke is comprehensive, addressing motor loss like hemiplegia and hemiparesis through proper positioning, active and passive range-of-motion exercises, and early ambulation training to prevent contractures and joint deformities, especially shoulder adduction. Communication challenges like aphasia (expressive, receptive, or global), dysarthria, and apraxia require individualized intervention, employing strategies like clear, unhurried speech, and alternative communication methods. Perceptual deficits such as homonymous hemianopsia (blindness of half the visual field) demand environmental adjustments and patient instruction to turn the head to compensate for visual loss. Managing nutritional status often involves assessing for dysphagia (difficulty swallowing) and implementing thickened liquids or pureed diets, ensuring the patient is sitting upright with the chin tucked during meals to prevent aspiration. Hemorrhagic strokes, which typically present with a sudden, severe headache, are managed acutely by controlling blood pressure, reversing anticoagulation if needed, and treating complications like cerebral vasospasm (a serious complication often treated with the calcium channel blocker nimodipine) and increased intracranial pressure (ICP). A crucial nursing intervention for patients with an aneurysm is implementing Aneurysm Precautions, which mandate bed rest in a quiet, nonstressful environment, elevation of the head of the bed to 30 to 45 degrees, and avoidance of any activity, such as the Valsalva maneuver or straining, that increases blood pressure or ICP. Throughout the recovery phase, for both types of stroke, psychological support is essential, addressing common issues like depression, emotional lability, and confusion, while providing extensive education and support systems to caregivers and family members preparing for transitional care.