INFECCIONES DEL SISTEMA NERVIOSO: MENINGITIS, ENCEFALITIS Y CLAVES CLÍNICAS VILLAMEDIC 2026

NERVOUS SYSTEM INFECTIONS: MENINGITIS, ENCEPHALITIS, ABSCESSES, AND CLINICAL KEYS 🧠🦠 In this video, we review central nervous system (CNS) infections, from meningitis and encephalitis to brain abscesses and other focal forms. 🧠 I'll show you how they are classified, what the typical presentations are, the main pathogens, and what signs you can't overlook during the examination, with an approach designed for students, interns, residents, and on-call physicians. 📚🩺 We begin with the definition: brain infections can affect the meninges (meningitis), the brain parenchyma (encephalitis/myelitis), or form localized collections such as brain abscesses and subdural empyemas. 🦠 I'll explain how dissemination occurs: hematogenously, from nearby foci (otitis, sinusitis, mastoiditis), or by direct inoculation (trauma, surgery, lumbar puncture).🩸 Next, we classify infections according to the pathogen: Bacterial (acute meningitis caused by Streptococcus pneumoniae, Neisseria meningitidis, Listeria). Viral (meningitis and encephalitis caused by enteroviruses, HSV, TBE, among others). Fungal and parasitic (cryptococcosis, neurocysticercosis, toxoplasmosis in immunocompromised individuals). You will see which age and clinical conditions are associated with each pathogen and why the epidemiological context changes the spectrum of pathogens.🌍 In the clinical section, we review the key symptoms of each presentation: Meningitis: severe headache, fever, neck stiffness, altered mental status, photophobia, and signs of meningeal irritation. Encephalitis: altered mental status, seizures, focal neurological symptoms, confusion, or delirium. Brain abscess: headache, focal neurological deficit, signs of intracranial hypertension, and sometimes subtle systemic symptoms. We also reviewed warning signs and urgency criteria for deciding on urgent CT scans, lumbar puncture, and immediate empirical treatment. 🚨 Then we reviewed basic diagnosis: the role of CT scans prior to lumbar puncture in some cases, the usefulness of CSF analysis (cells, glucose, protein, Gram stain, culture, and PCR), and imaging studies (MRI and CT) for detecting meningoencephalitis, abscesses, and empyemas. 🧪🫁 I also explained what to tell the lab to get the most useful results and when to request special studies (serology, biopsy, etc.). 📋 In the treatment section, we outlined the approach in steps: 1️⃣ Neurological support and stabilization. 2️⃣ Selection of empirical antibiotics, antivirals, or antifungals based on age, immunity, imaging studies, and clinical suspicion. 3️⃣ Targeted treatment based on the identified pathogen. 4️⃣ Management of complications such as cerebral edema, intracranial hypertension, hydrocephalus, or neurological deficits. I also review the role of dexamethasone in bacterial meningitis and when to refer to neurosurgery in the case of an abscess or empyema. 💊🧠 At the end of the video, you will have a clear mind map to answer: Is it meningitis, encephalitis, an abscess, or another form of CNS infection? What imaging tests and lumbar puncture should I perform, and in what order? What empirical regimens should I start with based on the patient's age and condition? When should you consider atypical diagnoses (tuberculosis, fungal infections, parasites) and when should you refer to a specialized center? 📋 If this content helps you organize nervous system infections for exams or on-call shifts, subscribe to the channel 🔔, leave your questions or clinical cases in the comments 💬, and share this video with colleagues who struggle with meningitis, encephalitis, and abscesses. Your support makes it possible to continue uploading clear material in Spanish about neurology and internal medicine. 🌍📚 #CNSInfections #meningitis #encephalitis #brainabscess #neurology #internalmedicine #infectiousdiseases #CNS #medicineinspanish #Mediesfera