Área Clínica Médica - 5º año: El paciente con déficit focal neurológico. Enf. vasculares del SNC

Neurological Signs and Central Nervous System Vascular Events

The discussion focuses on neurological signs and central nervous system vascular events, exploring clinical aspects, incidences, and patient management related to these topics.

Understanding Neurological Focal Signs

• A neurological focal sign indicates a brain function alteration affecting cranial nerves, spinal cord, and peripheral nerves. It includes deficits like changes in muscle strength.

• Sensory changes such as paresthesia (tingling sensation), hypoesthesia (decreased sensitivity), and anesthesia (loss of sensitivity) are considered focal signs.

• Muscle tone variations like hypertonia (increased muscle tone) or hypotonia (decreased muscle tone), along with reflex changes, can also signify focal signs.

Causes of Neurological Deficits

• Various neurological deficiencies can stem from brain, cranial nerves, spinal cord, or peripheral nerve alterations. Diseases like multiple sclerosis or amyotrophic lateral sclerosis are examples.

• Degenerative diseases affecting the cerebral cortex or white matter, vascular diseases like strokes, infectious diseases such as meningitis or encephalitis, and muscular disorders contribute to neurological deficits.

Diagnostic Approach for Neurological Disorders

• An extensive medical history through anamnesis is crucial to understand the patient's condition fully. It is essential to consider non-neurological factors that may impact the central nervous system.

• Thorough physical examinations help identify potential underlying issues beyond neurological symptoms. Detailed laboratory tests including hemogram, glucose levels, and creatinine provide valuable insights for diagnosis.

Additional Diagnostic Procedures

• In cases requiring further investigation into neuromuscular junction abnormalities like acetylcholine deficiency, procedures such as lumbar puncture for cerebrospinal fluid analysis are recommended.

Central Nervous System Disorders

In this section, the speaker discusses the definition of central nervous system disorders provided by the World Health Organization (WHO) and delves into various aspects related to vascular dysfunction in the brain.

Definition of Central Nervous System Disorders

• Central nervous system disorders are defined by WHO as a rapid onset of clinical signs reflecting focal or global dysfunction of the brain due to vascular causes lasting over 24 hours.

Time Estimation and Classification

• The time frame of 24 hours is used as an estimate due to different entities expressing themselves over varying durations, leading to different names and classifications based on clinical manifestations related to vascular lesions.

Vascular Disorders Description

• Vascular disorders are characterized by acute interaction causing focal dysfunction or a patient presenting with neurological focus alongside potential global cerebral dysfunction. These aspects will be further explored in subsequent discussions.

Types and Prevalence of Vascular Diseases

This section focuses on exploring specific diseases within the realm of vascular disorders, such as cerebral infarction and cerebral hemorrhage, emphasizing their significance and prevalence.

Types of Vascular Diseases

• Within vascular diseases, considerations include cerebral infarction (stroke) and cerebral hemorrhage, with special attention given to hemorrhagic stroke due to its distinct characteristics and frequency.

Epidemiological Data

• Understanding epidemiological data is crucial for assessing the prevalence and impact of these diseases globally. Vascular diseases rank as the third leading cause of death after cardiovascular diseases and cancer. They are also prevalent among individuals above 85 years old.

Risk Factors for Vascular Diseases

This segment delves into modifiable and non-modifiable risk factors associated with vascular diseases, highlighting key elements like hypertension, diabetes, obesity, smoking, alcoholism, and oral contraceptives.

Modifiable Risk Factors

• Modifiable risk factors such as hypertension play a significant role in vascular health by impacting microcirculation. Other factors like cardiac conditions can lead to vascular complications within the central nervous system.

• Diabetes contributes to microangiopathy affecting various organs including the eyes' retina. Similarly, hypercholesterolemia leads to fat accumulation followed by calcium deposits causing obstructions. Obesity exacerbates these issues along with sedentary lifestyles.

• Smoking induces vasoconstriction that affects arterial systems significantly over time. Alcoholism impacts both central and peripheral nervous systems resulting in specific alterations like cerebellar atrophy.

Non-modifiable Risk Factors

• Non-modifiable factors like race, gender, and age influence susceptibility to vascular diseases. Certain races may have lower predisposition while males exhibit higher incidence rates compared to females. Age plays a crucial role with increased vulnerability beyond 50 years old.

Pathology of Ischemic Stroke

In this section, the speaker discusses the pathology of ischemic stroke, focusing on transient ischemic attacks and reversible ischemic neurological deficits.

Pathology Classification

• Transient Ischemic Attack (TIA) is a brief episode of neurological dysfunction attributed to ischemia lasting less than 24 hours with no identifiable cause other than vascular.

• TIAs last less than 24 hours and can involve anterior circulation from carotid arteries or posterior circulation from vertebral arteries. Symptoms may affect ocular, cerebral, or both systems.

Symptoms and Manifestations

• Ocular symptoms like amaurosis fugax (temporary vision loss), vertigo, diplopia (double vision), dysphagia, dysarthria (speech disorder), ataxia, and visual disturbances indicate TIA affecting cranial nerves in the brainstem.

• Reversible Ischemic Neurological Deficit lasts up to 72 hours without leaving any residual effects. It shares similarities with TIA but is longer-lasting.

Diagnostic Considerations

• Both TIA and RIND do not show any abnormalities in imaging studies like CT or MRI post-event. Doppler ultrasound helps detect vascular changes but not brain imprints.

• Echocardiogram is crucial for assessing vascular alterations in patients with TIA/RIND. Brain imaging may remain normal even when vascular issues are present.

Types of Cerebral Infarction

This part delves into established cerebral infarctions based on their etiology: atherothrombotic and embolic infarctions.

Atherothrombotic Infarction

• Atherothrombotic strokes evolve gradually over time, often starting during sleep and progressing upon waking. Initial symptoms may include mild speech difficulties escalating to paralysis or sensory deficits.

• Carotid artery occlusion can lead to specific symptoms like hemicephalic headache before an impending stroke event due to compromised blood flow in the brainstem area.

Embolic Cerebral Infarction

• Embolic strokes occur suddenly without warning signs. They are commonly associated with atrial fibrillation (~80% cases), emphasizing its impact on central nervous system function through clot formation elsewhere impacting brain vasculature directly.

Important Aspects of Arterial Hypertension

In this section, the speaker discusses the significance of arterial hypertension and its implications on cerebral hemorrhage, focusing on symptoms like sudden onset headaches and vomiting.

Understanding Arterial Hypertension

• Arterial hypertension plays a crucial role in cerebral hemorrhage, accounting for approximately 80% of cases.

• The presence of blood mass or hematoma within the brain parenchyma leads to increased pressure in the central nervous system, known as intracranial hypertension. This condition manifests as intense headaches and vomiting due to the pressure exerted by the hematoma.

• The location of the hematoma or hemorrhage within the brain provides insights into focal neurological signs.

Neurological Complications and Considerations

This segment delves into neurological complications associated with subarachnoid hemorrhage, emphasizing intense headaches and potential loss of consciousness in affected individuals.

Subarachnoid Hemorrhage Insights

• Subarachnoid hemorrhage typically presents with sudden, severe headaches that are unprecedented for the individual.

• Young patients experiencing intense, unfamiliar headaches upon presentation to medical facilities should raise concerns about possible subarachnoid hemorrhage due to its prevalence in this demographic group.

Complications and Management Strategies

The discussion shifts towards common etiologies such as arterial aneurysm rupture or arteriovenous malformations leading to neurological deficits and potential complications necessitating vigilant monitoring and management strategies.

Etiologies and Complications

• Rupture of arterial aneurysms or arteriovenous malformations is a primary cause of subarachnoid hemorrhage, often resulting in focal neurological deficits due to ischemia from vasospasm.

• Complications arising from hemorrhages include irritant effects on blood vessels causing arterial vasospasm and subsequent rebleeding episodes. Monitoring blood pressure is crucial to prevent clot disruption leading to recurrent bleeding.

Significance of Imaging Techniques in Vascular Diseases

Exploring diagnostic modalities like computed tomography (CT), vital for identifying vascular events such as ischemic strokes or intracerebral bleeds promptly for effective management strategies.

Diagnostic Imaging Importance

• CT scans serve as pivotal tools for rapid assessment post-symptom onset, aiding in distinguishing between ischemic events and cerebral bleeds crucial for appropriate treatment decisions.

Medical Imaging and Diagnostic Techniques

In this section, the speaker discusses medical imaging techniques, specifically focusing on cerebral infarction and hemorrhage as seen through tomography.

Understanding Cerebral Infarction and Hemorrhage

• The speaker explains the importance of observing the midline in tomographic images to identify cerebral hematomas in different brain regions.

• A lack of midline distortion indicates no signs of endocrine hypertension, providing reassurance regarding brain structure integrity.

• Severe hematomas can displace the midline, emphasizing the significance of assessing lateral ventricles for blood accumulation known as ventricular shift.

• Extensive bleeding may fill cisterns and ventricles, leading to a condition called ventricular collapse due to significant blood presence.

• Hemorrhages typically follow arterial paths within the skull base, highlighting their potential to impact neurological structures.

Identification of Cerebral Infarction

This segment delves into recognizing cerebral infarctions through imaging techniques post 48 hours from onset.

Detecting Cerebral Infarctions

• After 48 hours, hypodensity indicative of ischemic lesions contrasts with hyperdensity associated with hemorrhages on tomography scans.

• Differentiating between ischemic and hemorrhagic lesions aids in accurate diagnosis and treatment planning for patients.

• Magnetic resonance imaging reveals detailed views of infarctions, showcasing displacement effects on brain structures like lateral ventricles.

Diagnostic Procedures for Neurological Conditions

The discussion shifts towards diagnostic procedures beyond imaging for comprehensive assessment of neurological conditions.

Comprehensive Diagnosis

• Apart from imaging findings, additional tests like angiography help confirm diagnoses when uncertainty exists between stroke types or aneurysms.

• Angiography via magnetic resonance is preferred over arteriography due to its non-invasive nature but both provide valuable insights into vascular health.

Cardiovascular Considerations in Neurological Symptoms

Exploring how cardiovascular issues can manifest as neurological symptoms requiring thorough evaluation.

Cardiovascular Impact on Neurology

• Patients presenting with fainting episodes may not solely indicate transient ischemic attacks; underlying cardiac conditions should be considered for a holistic assessment.

Podiatric Diseases and Treatments

The discussion delves into the complexities of podiatric diseases, emphasizing the importance of accurate diagnosis and tailored treatment plans to address various conditions effectively.

Understanding Podiatric Diseases

• Some diseases may not have vascular hemorrhagic implications but can manifest similar symptoms, necessitating differentiation from vascular disorders.

Diagnostic Procedures for Podiatric Conditions

• In cases of neuromuscular junction involvement leading to ascending paralysis, cerebrospinal fluid analysis is crucial. A dissociation in albumin cytology may indicate specific conditions.

Treatment Approaches for Podiatric Disorders

• Diagnosis involves a comprehensive assessment through blood tests, urine analysis, and serology to tailor treatment strategies based on the underlying pathology.

• For ischemic vascular accidents, general measures include antiplatelet and anticoagulant therapy within a specific timeframe. Thrombolytic therapy and neuroprotective interventions are considered if necessary.

Management Strategies for Vascular Conditions

This segment focuses on managing vascular conditions by controlling risk factors, utilizing appropriate medications, and considering surgical interventions when required.

Control of Vascular Risk Factors

• Implementing antiplatelet therapy like aspirin and anticoagulants becomes essential in managing patients with additional risk factors such as atrial fibrillation.

Surgical Considerations for Hemorrhagic Cases

• In cases of significant hemorrhage or suspected aneurysmal rupture, surgical intervention may be necessary to address complications effectively.

Post-Treatment Care for Neurovascular Patients

Post-treatment care plays a vital role in ensuring optimal recovery for neurovascular patients by addressing pain management, monitoring intracranial pressure, and preventing complications.

Pain Management and Intracranial Pressure Monitoring

• Strict control of blood pressure is crucial post-surgery to prevent rebleeding. Analgesics should be administered judiciously to manage unique pain associated with these conditions.

Preventive Measures Post-Surgery

• Constipation avoidance is paramount due to its potential impact on intracranial pressure. Nimodipine serves as a vasodilator post-surgery to mitigate vasoconstriction effects caused by blood accumulation.

Neuronal Response Considerations

Understanding neuronal responses post-treatment aids in tailoring preventive measures against potential complications like seizures.

Neuronal Irritability Management