Brain stroke... Symptoms, causes, effects, treatment and rehabilitation

A stroke constitutes an abrupt interruption or severe reduction of blood supply to specific regions of the brain, resulting in oxygen deprivation (hypoxia) and subsequent necrosis of neuronal cells within the affected area. This condition frequently leads to profound neurological deficits, including but not limited to: swallowing difficulties (dysphagia), impaired speech production or comprehension (dysphasia or—when language centers are extensively damaged—aphasia), motor coordination disorders (ataxia), unilateral paralysis (hemiplegia), visual field defects (hemianopsia), and a spectrum of cognitive impairments. While certain symptoms may diminish through targeted rehabilitation efforts, others remain permanent, contingent upon the extent of cerebral tissue damage. Two primary stroke subtypes are distinguished: **ischemic stroke** (accounting for approximately 80% of cases), triggered by vascular occlusion due to thrombus or embolus formation, and **hemorrhagic stroke** (comprising 20% of incidents), resulting from the rupture of a compromised blood vessel with consequent bleeding into the brain parenchyma or subarachnoid space. Key risk factors include coronary artery disease, atrial fibrillation, hypertension, and the presence of prosthetic heart valves.

Stroke represents a consequence of prolonged—exceeding 24 hours—disruptions in cerebral blood flow, resulting in permanent damage to neural tissue. The characteristic symptoms of this condition are distinctly marked and relatively straightforward to identify, even for individuals without medical training. Even in cases of mild stroke episodes, impairments in verbal communication are observable: patients articulate words indistinctly, struggle to formulate complete sentences, or entirely lose the ability to pronounce specific terms. A hallmark symptom is unilateral muscle paralysis, manifested as motor asymmetry—affected individuals are unable to raise both upper limbs simultaneously. Damage to one of the cerebral hemispheres leads to motor dysfunction on the contralateral side: if the lesion is located in the right hemisphere, the left side of the body becomes paralyzed or significantly weakened. Additionally, patients experience deficits in visual perception, balance disorders, recurrent headaches of varying severity, and episodes of vertigo. In advanced stages of the disease, paralysis may progress to complete hemiplegia, rendering the affected individual incapable of controlling the paralyzed limbs. Oral communication ability undergoes severe restriction, often to the point of total mutism. Cognitive impairments frequently accompany these symptoms, ranging from mild confusion to profound coma.

The principal etiologic factors underlying ischemic stroke encompass: occlusion of major cerebral arteries secondary to progressive atherosclerotic plaque formation, microvascular injury induced by sustained hypertensive states and diabetic microangiopathy, and cardioembolic phenomena wherein thrombi originating from cardiac chambers migrate into the cerebral circulation, resulting in arterial obstruction. Hemorrhagic stroke, by contrast, arises from the concurrent rupture of multiple small arterioles or capillaries, leading to extensive intracerebral hemorrhage. A robust body of scientific evidence—including meta-analyses of randomized controlled trials—demonstrates that through targeted lifestyle modifications and timely pharmacological interventions, both the incidence of stroke can be substantially mitigated and therapeutic outcomes following an acute event can be optimized. Critical determinants influencing clinical progression include the patient’s biological age, the presence of systemic comorbidities (particularly cardiovascular and metabolic disorders), and the interval between symptom onset and the initiation of specialized medical care. The most significant, evidence-supported risk factors comprise: endothelial dysfunction attributable to atherosclerosis, impairments in glucose metabolism, obesity (with particular emphasis on visceral adiposity), persistent blood pressure elevations exceeding 140/90 mmHg, dyslipidemic profiles (characterized by elevated low-density lipoprotein and reduced high-density lipoprotein levels), chronic cardiovascular diseases (including atrial fibrillation), exposure to tobacco smoke (both active and passive), excessive alcohol consumption surpassing recommended limits, and physical inactivity devoid of regular exercise.

A substantial proportion of the modifiable risk factors associated with stroke incidence can be effectively counteracted through deliberate nutritional choices and the adoption of a health-conscious lifestyle. Extensive epidemiological investigations have consistently demonstrated a robust correlation between the habitual consumption of *trans* fatty acids—ubiquitously found in industrially hydrogenated margarines, commercially prepared baked goods, and fast-food items—and a markedly elevated susceptibility to cerebrovascular accidents. Conversely, sustained intake of polyunsaturated omega-3 fatty acids exhibits a pronounced protective effect, particularly in female populations; this benefit stems from favorable alterations in blood lipid profiles, which diminish the propensity of low-density lipoprotein (LDL) cholesterol particles to adhere to vascular endothelial surfaces and decelerate the formation of atherosclerotic plaques. Of equal significance is the impact of high-glycemic-index diets—characterized by rapid postprandial glucose spikes—on accelerating atherogenic processes through excessive insulin secretion. As an optimal dietary framework, nutrition specialists advocate for a pattern rich in unprocessed vegetables and fruits, whole-grain cereals, lean marine fish, and leguminous plants. Compelling evidence has also emerged from clinical trials investigating riboflavin (vitamin B2) supplementation in the context of cardiovascular event recovery; this micronutrient demonstrates potential in attenuating oxidative neuronal damage and mitigating cerebral edema following ischemic episodes. The cornerstones of primary stroke prevention, however, remain the maintenance of body weight within normal body mass index (BMI) parameters and the routine monitoring of serum lipid levels. A low-carbohydrate diet augmented with sources of monounsaturated and polyunsaturated fatty acids (such as extra-virgin olive oil, tree nuts, and flaxseeds) not only facilitates adipose tissue reduction but also promotes a favorable lipid profile—lowering triglyceride and LDL cholesterol concentrations while elevating high-density lipoprotein (HDL) cholesterol, commonly referred to as "good" cholesterol.

Individuals who have experienced a cerebrovascular event frequently encounter persistent challenges in regaining full motor functionality. In cases where the stroke was extensive and affected a substantial portion of brain tissue, there is a significant likelihood that the affected individual may never regain the capacity for independent living, instead requiring continuous medical supervision and caregiver assistance. Verbal communication impairments, such as aphasia, alongside paralysis or paresis of the limbs, may become permanent, substantially limiting both social interactions and the ability to perform basic activities of daily living. Conversely, when the stroke’s impact was less severe, neurological symptoms tend to be milder—manifesting, for example, as unilateral muscle weakness (hemiparesis) or minor speech articulation difficulties, which may nonetheless impede fluid ambulation or precise verbal expression. A critical determinant of prognosis is the interval between the onset of initial symptoms and the initiation of specialized medical intervention: treatment commenced within the first four hours of stroke onset significantly enhances the probability of partial or even substantial recovery, particularly through the application of thrombolytic therapy or mechanical thrombectomy.

Immediate transportation of a patient to a medical facility following the onset of stroke symptoms is critical for optimizing outcomes, as the administration of thrombolytic agents in cases of ischemic stroke must occur without delay to dissolve the occlusive thrombus and restore cerebral blood flow. The interval between symptom manifestation and the initiation of treatment directly correlates with the extent of potential neurological sequelae. Diagnostic evaluation relies primarily on computed tomography of the head, which facilitates differentiation between hemorrhagic and ischemic stroke while pinpointing the source of bleeding or thrombus localization. Complementary diagnostic procedures include electrocardiography to assess cardiac function, laboratory analyses of glucose levels, electrolyte balance, and lipid profiles. Throughout hospitalization, continuous monitoring of vital signs—such as arterial blood pressure, respiratory rate, and cardiac activity—is essential, as the body often triggers a compensatory hypertensive response to maintain cerebral perfusion in the wake of ischemia. Pharmacological intervention to lower blood pressure is warranted only in cases of severely elevated readings, specifically those exceeding 220 mmHg systolic or 120 mmHg diastolic. A cornerstone of secondary prevention involves the consistent use of antiplatelet medications, which inhibit platelet aggregation and thereby substantially mitigate the risk of recurrent vascular events. Epidemiological data indicate that approximately 10% of stroke survivors experience a subsequent episode, underscoring the necessity for ongoing pharmacological management alongside lifestyle modifications, including an anti-inflammatory diet and tailored physical activity regimens. Neurological rehabilitation assumes a pivotal role in addressing motor deficits or paralysis, necessitating a multidisciplinary therapeutic approach to optimize functional recovery.

Following the occurrence of a cerebrovascular accident, a comprehensive evaluation of the patient’s nutritional status becomes imperative, with particular emphasis on assessing the stroke’s impact on the individual’s capacity for independent food consumption. Of paramount importance is the identification of potential dysphagia—a complication affecting an estimated 64% to 90% of stroke survivors—as well as cognitive impairments that may result in forgotten meals or irregular eating patterns. For patients with severe motor disabilities, even fundamental tasks such as eating from a plate can pose significant challenges. A particularly hazardous complication is the aspiration of food particles into the respiratory tract, which substantially elevates the risk of aspiration pneumonia—a condition that poses a grave threat, especially to elderly patients. To diagnose potential swallowing difficulties, a specialized swallowing assessment is essential to determine the patient’s tolerance for various food textures. Based on these findings, a tailored dietary regimen should be implemented, prioritizing smooth, homogeneous foods such as purées, creamy soups, seedless fruit mousses, or thickened liquids. Additionally, thorough straining of meals is recommended to eliminate small solid particles. An equally critical component of post-stroke care is ensuring adequate hydration; in cases where oral fluid intake is insufficient or impossible, intravenous or percutaneous fluid administration may be necessary.

Paralysis or paresis resulting from a stroke can significantly impair a patient’s ability to function independently; however, systematically conducted neurological rehabilitation facilitates the gradual restoration of motor control. Its primary objective is not only to prevent the development of joint and muscle contractures but also to strengthen weakened muscle groups through individually tailored kinesitherapy techniques. The optimal approach involves initiating the rehabilitation process during hospitalization, which accelerates health stabilization. The decision regarding the timing and intensity of therapy is made by a team of specialists—a neurologist and a physiotherapist—with whom continuous collaboration is essential. Equally important are speech therapy exercises aimed at improving articulation and neurocognitive therapies designed to restore cognitive functions. Many patients experience aphasia, a language disorder characterized by difficulties in formulating or comprehending basic linguistic messages. Here, the support of loved ones plays a pivotal role: Regular conversations, patient listening, and engaging the patient in simple verbal tasks—such as reciting the days of the week, months, or recalling personal memories—stimulate neuroplastic processes. Encouraging emotional expression is likewise crucial, as it aids psychological readaptation. It is worth noting that the most effective strategy remains stroke prevention, encompassing lifestyle modifications and the management of risk factors such as hypertension or atherosclerosis. Unfortunately, some stroke consequences are often irreversible, making it imperative to recognize early symptoms—such as sudden unilateral weakness, visual disturbances, or dizziness—and to be familiar with therapeutic standards to maximize the chances of full functional recovery.