Neurology

Client Education in Veterinary Medicine

  • Introduction
    • Importance of client education in veterinary care.
    • Brief personal experience as a doctor at a VCA hospital.
    • Discussed how to convey seizure activity information effectively to pet owners, considering the emotional distress it creates.

Overview of Brain Injuries

  • Types of Events:

    • Primary Events:
    • Directly affect the brain.
    • Examples: Trauma (e.g., head trauma from being hit by cars or blunt objects).
    • Result in cell damage through ischemia and other forms of injury.
    • Secondary Events:
    • Occur around the brain, not directly due to an initial brain injury.
    • Increased intracranial pressure (ICP), swelling, fluid accumulation, hypoxia, and seizure activity.

  • Clinical Signs of Brain Injury:

    • Seizures (most common).
    • Nosebleeds (Epitaxis).
    • Ocular hemorrhage (hyphema).
    • Syncope (fainting episodes).
    • Shock or cardiac arrhythmias.

  • Case Study:

    • 110-pound mastiff fell from a height of 15 feet onto its head.
    • Resulted in severe neurologic signs, weakness and inability to stand.
    • Treatment included administering butorphanol and referral to an emergency clinic for CT imaging.
    • The dog had a urinary catheter for three months but showed improvement afterward.

Treatment of Brain Injuries and Seizures

  • Treatment Options:

    • Use of osmotic agent Mannitol to reduce ICP and intracranial edema.
    • Administration Concerns:
    • Mannitol crystallizes, requires vigilance during administration to monitor IV for crystallization.
    • Crystallization can cause intravascular damage and complications like disseminated intravascular coagulation (DIC).

  • Anti-Seizure Medications (Antiepileptic Drugs):

    • Neurologists have strict criteria for initiating therapy.
    • Recent recommendations suggest starting therapy if seizures last longer than three minutes or occur in clusters.
    • Client handout includes seizure therapy initiation criteria which can alleviate owner concerns.
    • Initial consultations focus on physical examinations and client education rather than immediate diagnostic tests since first seizure presentations often yield no significant blood work results.

  • Seizure Types and Phases:

    • Phases include:
    • Preictal Phase: Potential behavioral changes leading up to the seizure, not all animals exhibit this phase.
    • Ictal Phase: The active seizure itself; may vary in manifestations.
    • Postictal Phase: Recovery phase characterized by confusion or unpredictable behavior, can last from hours to days.

  • Diagnosis and Management Strategies for Seizure Cases:

    • Initial focus on brief education, including logs of seizures, medication adherence, and expectations.
    • Aim to alleviate common misconceptions regarding the treatment of seizures; that medication is aimed at minimizing frequency/severity, not a complete cure.
    • Long-term management includes starting a log of seizures: symptoms, duration, and changes post-seizure can help identify triggers.

Discussing Anti-Seizure Medications

  • Long-term Treatment Considerations:

    • Once therapy initiation is required, it is generally a life-long commitment.
    • Compliance issues arise when owners experience infrequent seizures and consider discontinuing medication; this can lead to recurrence of seizure activity and potential treatment challenges.

  • Medication Side Effects and Adjustments:

    • Common side effects of overdose include sedation and gastrointestinal signs, with severe cases leading to liver toxicity.
    • Frequent blood tests are necessary for drugs like Phenobarbital to monitor levels and adjust dosages effectively.

Status Epilepticus

  • Definition:

    • Continuous seizure activity lasting longer than 10 minutes or repeated seizures without recovery.
    • Considered a medical emergency requiring immediate intervention.

  • Management:

    • Initial treatment with midazolam, with potential administration of propofol if seizures persist.
    • Monitoring is critical for body temperature and chemistry levels, as hyperthermia can lead to increased mortality rates.

  • Cooling Strategies:

    • Employ methods such as ice packs specifically on the jugular vein to lower body temperature gradually and effectively, avoiding rapid cooling which could cause other medical issues.

Neurological Examination and Seizure Response

  • Immediate Response to Seizures:

    • Owners are cautioned against trying to hold or restrain the animal during seizures to prevent harm.
    • Concern for "swallowing tongue" myths debunked; such incidents do not occur, and intervention can result in injury to both the animal and the person.

  • Behavioral Indicators:

    • Identify true seizure versus other conditions such as nightmares using visual cues and responsiveness to stimuli.

Idiopathic Vestibular Disease

  • Overview:

    • Characterized by head tilt, circling, and often seen in older animals.
    • Nystagmus is commonly associated, with quick and slow phases indicative of potential lesions.

  • Management:

    • Conduct thorough physical exams, checking for ear infections, and diagnose idiopathic vestibular disease when no other causes are identified.
    • Treatment options include meclizine for motion sickness and advising on recovery strategies.

  • Communication with Pet Owners:

    • Educating owners about the benign nature of idiopathic vestibular disease can alleviate fears regarding serious conditions like tumors or cancer.

Nystagmus Analysis

  • Variation:

    • Categorized into fast-phase and slow-phase movements, relationship to potential lesions discussed.
    • Fast phase indicates direction away from lesion while manifestation and consistency can guide further diagnostics (e.g., MRI).

  • Clinical Considerations:

    • Persistent nystagmus warrants more thorough investigation to ascertain underlying cause.
    • Normal nystagmus may occur in certain breeds and positions; differentiation is crucial during examinations.

Neoplasia as a Cause of Neurological Signs

  • Age and Indicators:

    • Higher incidences associated with elderly animals (greater than seven years).
    • Signs of head pressing, circling, and ataxia indicate the need for referral to neurology for further diagnostics including CSF tap, CT, and MRI.

  • Treatment Options:

    • Surgery may be an option if tumors are operable; palliative care for inoperable cases includes medications to manage symptoms and improve quality of life.