Cognitive Disorders

Neurocognitive Disorders: Understanding Cognitive Decline & Brain Health

Neurocognitive disorders encompass a spectrum of conditions affecting thinking, memory, and cognition. These disorders range from mild cognitive impairment—where memory or thinking changes are noticeable but don't significantly impair daily function—to major neurocognitive disorder (dementia), where cognitive decline is severe enough to prevent independent living. Understanding these disorders, their causes, and available treatments is essential for patients, families, and caregivers navigating cognitive decline. At KwikPsych in Austin, we provide comprehensive assessment and psychiatric management of neurocognitive disorders.

What Are Neurocognitive Disorders?

Neurocognitive disorders are characterized by acquired deficits in one or more cognitive domains, with evidence of decline from a prior level of functioning. The DSM-5 distinguishes two severity levels:

Mild Neurocognitive Disorder

• Modest decline in cognitive function
• Person is aware of the change
• Cognitive deficits do not prevent independent living
• Cognitive abilities remain sufficient for complex functional tasks
• Individual may need cognitive aids or extra time for complex tasks
• Mild impairment on neuropsychological testing

Major Neurocognitive Disorder (Dementia)

• Significant decline in one or more cognitive domains
• Cognitive deficits interfere substantially with independence
• Person may or may not be aware of the decline
• Unable to manage finances, medications, or complex daily tasks without assistance
• May require formal care services or complete care
• Moderate to severe impairment on neuropsychological testing

Cognitive Domains Affected

Neurocognitive disorders can affect any of these cognitive domains:

Memory

• Immediate memory (span of attention)
• Working memory (holding and manipulating information)
• Short-term and long-term memory
• Verbal and nonverbal memory
• Memory for faces, places, words, events

Executive Function

• Planning and organization
• Decision-making
• Problem-solving
• Mental flexibility and abstract thinking
• Impulse control and inhibition
• Task initiation and completion

Language

• Word-finding (anomia)
• Comprehension
• Repetition
• Speech fluency
• Reading and writing
• Naming and verbal expression

Visuospatial Skills

• Depth perception
• Spatial relationships
• Visual recognition
• Construction ability
• Reading maps and navigating

Attention & Processing Speed

• Sustained attention
• Divided attention
• Processing speed
• Concentration

Social Cognition

• Theory of mind (understanding others' mental states)
• Emotional recognition and understanding
• Empathy and perspective-taking
• Social appropriateness

Types of Neurocognitive Disorders

Neurocognitive disorders are classified by etiology (underlying cause).

Major & Mild Neurocognitive Disorder Due to Alzheimer's Disease

Alzheimer's is the most common cause of neurocognitive disorder, accounting for 60–80% of dementia cases. It involves accumulation of amyloid plaques and tau tangles.

Key Features

• Gradual onset; slowly progressive course
• Memory loss early and prominent
• Affects other domains (language, executive function) later
• Behavioral changes: apathy, depression, anxiety, aggression in later stages
• Typically age 65+; early-onset possible in 40s–60s
• No cure; cholinesterase inhibitors and memantine slow decline

More information: See separate Alzheimer's disease guide

Major & Mild Neurocognitive Disorder Due to Vascular Causes

Vascular neurocognitive disorder results from reduced blood flow to the brain from stroke or small-vessel disease.

Key Features

• Sudden or stepwise onset; "staircase" progression
• May follow visible stroke or occur after multiple mini-strokes
• Cognitive pattern depends on stroke location (not memory-first like AD)
• Risk factors: hypertension, diabetes, smoking, high cholesterol, atrial fibrillation
• Brain imaging shows stroke or white matter disease
• Often mixed with Alzheimer's pathology

Treatment: Blood pressure control, antiplatelet therapy (aspirin), risk factor management; address modifiable causes

Major & Mild Neurocognitive Disorder with Lewy Bodies

Lewy body disease involves accumulation of alpha-synuclein protein.

Key Features

• Visual hallucinations early and prominent (distinguishing feature)
• Fluctuating cognition (attention varies minute-to-minute)
• Parkinsonism: rigidity, slowness, tremor, stooped posture
• REM sleep behavior disorder common
• Critical: Extreme sensitivity to antipsychotics (major reactions; contraindicated)
• Memory may be relatively preserved early

Treatment: Avoid antipsychotics; cholinesterase inhibitors may help; manage Parkinsonian features

Major & Mild Neurocognitive Disorder Due to Frontotemporal Causes

Frontotemporal dementia (FTD) involves atrophy of frontal and temporal lobes.

Key Features

• Behavioral variant: personality change, disinhibition, apathy (not memory loss first)
• Language variants: difficulty finding words, understanding language
• Memory relatively preserved early
• Younger age of onset (40s–60s common)
• Genetic component (20-40% of cases have a significant family history)
• Hallucinations absent or rare
• Often misdiagnosed as psychiatric illness

Treatment: Behavioral interventions; SSRIs for behavioral symptoms; genetic counseling if familial

Major & Mild Neurocognitive Disorder Due to Traumatic Brain Injury (TBI)

Neurocognitive disorder can develop following moderate to severe TBI.

Key Features

• Temporal relationship between head trauma and cognitive decline
• Memory loss, attention and concentration problems, executive dysfunction common
• Personality and mood changes frequent
• Severity depends on injury severity, age at injury, prior brain health
• Can occur immediately after injury or months to years later
• Some recovery possible with rehabilitation

Treatment: Cognitive rehabilitation, behavioral therapy, medication management for specific symptoms

Major & Mild Neurocognitive Disorder Due to Parkinson's Disease

Cognitive decline can occur in advanced Parkinson's disease.

Key Features

• Onset usually after Parkinsonism has been present for years
• Attention, executive function, memory affected
• Hallucinations common
• Parkinsonism prominent (rigid, slow, tremor)
• Antipsychotics worsen Parkinsonism (avoid or use clozapine if needed)

Treatment: Cognitive enhancement; avoid antipsychotics; dopamine agonists; cholinesterase inhibitors may help

Substance/Medication-Induced Major & Mild Neurocognitive Disorder

Cognitive decline caused by toxins, medications, or substance abuse.

Common Causes

• Alcohol-related: Chronic heavy drinking causes Wernicke-Korsakoff syndrome (memory loss, confusion, movement problems)
• Medications: Benzodiazepines, anticholinergics, opioids, sedating antidepressants with chronic use
• Drugs: Stimulants (cocaine, methamphetamine), inhalants
• Toxins: Lead, mercury, pesticides
• Medical conditions: Hypoxia, carbon monoxide exposure

Key Features

• Temporal relationship between substance/medication exposure and cognitive decline
• May be reversible if substance is discontinued early
• Chronic use leads to permanent damage

Treatment: Discontinue offending substance/medication; address underlying addiction if present; rehabilitation

Major & Mild Neurocognitive Disorder Due to HIV Infection

HIV-associated neurocognitive disorder (HAND) occurs in context of HIV infection.

Key Features

• Can occur at any CD4 count
• Attention, processing speed, executive function primarily affected
• Motor slowing common
• Memory relatively preserved
• Risk reduced by antiretroviral therapy
• Medications (especially protease inhibitors) may help cognition

Treatment: Optimize antiretroviral therapy; cognitive rehabilitation; treat comorbid psychiatric illness

Major & Mild Neurocognitive Disorder Due to Prion Disease (Creutzfeldt-Jakob Disease)

Prion diseases cause rapidly progressive dementia.

Key Features

• Rapid onset and progression (weeks to months, not years)
• Cognitive decline, behavior change, visual disturbance, seizures
• Myoclonus (involuntary jerks) common
• EEG shows characteristic patterns
• MRI may show characteristic changes
• Fatal; most patients die within 1 year of symptom onset
• No treatment; supportive care

Treatment: Symptomatic treatment; palliative care; genetic counseling if familial

Major & Mild Neurocognitive Disorder Due to Other Medical Conditions

Many medical illnesses cause cognitive impairment:

• Normal pressure hydrocephalus (treatable; ventriculoperitoneal shunt may help)
• Chronic hepatic disease
• Chronic kidney disease
• Uncontrolled diabetes
• Hypoxia
• Sleep apnea
• Thyroid disease
• B12 or folate deficiency
• Chronic infections

Treatment: Address underlying medical condition; may improve cognition if caught early

Differential Diagnosis: Reversible vs. Irreversible Causes

A critical task is distinguishing treatable conditions from irreversible neurodegeneration.

Reversible Causes

• Medication side effects (discontinue offending agent)
• Substance abuse (treat addiction; some recovery possible with abstinence)
• Medical illness (thyroid, vitamin deficiency, infection): treat the underlying condition
• Depression (pseudodementia): treat depression; cognition improves
• Normal pressure hydrocephalus: VP shunt may restore cognition
• Sleep disorders: treat sleep apnea or insomnia; cognition improves

Irreversible Causes

• Alzheimer's disease
• Vascular dementia
• Lewy body dementia
• Frontotemporal dementia
• Prion disease
• Advanced TBI

Early identification of reversible causes is crucial because they can be treated.

Assessment of Neurocognitive Disorders

Comprehensive evaluation includes:

Clinical History & Neuropsychiatric Examination

• Onset and progression of cognitive change
• Which cognitive domains are affected
• Impact on daily function and independence
• Family history
• Risk factors
• Current medications
• Mental status examination
• Neurological examination

Cognitive Testing

• Brief screening (Mini-Cog, MoCA)
• Comprehensive neuropsychological testing for detailed profile
• Baseline for tracking progression

Laboratory Testing

• Blood work: CBC, CMP, thyroid, B12, folate, HIV, syphilis
• Biomarkers: CSF or blood tau, amyloid, phosphorylated tau
• Genetic testing if indicated (familial dementia, frontotemporal)

Brain Imaging

• MRI: Standard structural imaging; shows atrophy pattern, stroke, white matter disease
• CT: If MRI contraindicated
• PET: Amyloid, tau, FDG (in specialized centers)

Informant Interview

• Family member's perspective on symptom onset, progression, functional impact
• Behavioral changes
• Medical and psychiatric history

Treatment of Neurocognitive Disorders

Pharmacologic Treatment

Cognitive Enhancement

• Cholinesterase inhibitors (donepezil, rivastigmine, galantamine): Help memory and cognition in Alzheimer's and other dementias
• Memantine: Reduces excitotoxicity; helps in moderate to severe AD
• Anti-amyloid monoclonal antibodies (lecanemab): Emerging disease-modifying therapy for early AD. Note: aducanumab (Aduhelm) was voluntarily withdrawn by Biogen in January 2024.
• Cognitive stimulants: Methylphenidate, amantadine for specific symptoms

Behavioral Symptom Management

• SSRIs for depression, anxiety, apathy
• Antipsychotics (low-dose, time-limited) for psychosis, severe agitation
• Mood stabilizers for irritability
• Sleep aids for insomnia
• Anxiolytics (buspirone preferred over benzodiazepines)

Cardiovascular & Metabolic Management

• Blood pressure control (reduce vascular risk)
• Diabetes management
• Cholesterol management
• Antiplatelet therapy (aspirin) for vascular prevention

Non-Pharmacologic Interventions

• Cognitive stimulation: Puzzles, reading, learning, engaging hobbies
• Physical activity: Exercise improves cognition, mood, sleep
• Structured routine: Consistency reduces behavioral problems
• Social engagement: Meaningful activities, community involvement
• Cognitive rehabilitation: Therapy to maximize remaining abilities, compensate for deficits
• Caregiver support: Education, respite, counseling, support groups

Psychiatric Complications of Neurocognitive Disorders

Cognitive decline is often accompanied by behavioral and mood changes requiring psychiatric management.

Depression

• Common in early dementia; affects 40–50% of patients
• Treated with SSRIs; improves mood and apathy
• Therapy and caregiver support essential

Anxiety

• Worry, panic, generalized anxiety common
• Treated with SSRIs, buspirone
• Behavioral interventions (calming environment, routine)

Psychosis

• Hallucinations or delusions in 20–40% of dementia patients
• Treated with antipsychotics (lowest effective dose, time-limited)
• Avoid in Lewy body dementia (severe reactions)
• Behavioral investigation for triggers essential

Agitation & Aggression

• Often triggered by pain, infection, unmet needs, overstimulation
• Behavioral interventions first
• Medications if severe and safety threat

Caring for Someone with Neurocognitive Disorder

For Patients & Families

• Early diagnosis allows time for planning and preparation
• Advance directives and healthcare proxies should be established
• Cognitive aids and environmental modifications support function
• Caregiver support, respite care, and professional care services essential
• End-of-life discussions important
• Palliative care appropriate in late stages

For Caregivers

• Caregiver stress and depression are common; seek support
• Support groups, therapy, respite care crucial
• Take care of your physical and mental health
• Remember that changes in behavior reflect disease, not intentional harm
• Seek professional help for caregiver burnout

KwikPsych Approach to Neurocognitive Disorders

At KwikPsych in Austin, Texas, we provide:

• Comprehensive neuropsychiatric evaluation
• Cognitive testing and coordination with neuropsychology
• Diagnosis and prognostication
• Medication management for cognitive and behavioral symptoms
• Caregiver education and support
• Care coordination with neurology, geriatrics, and social services
• Family-centered, compassionate approach

We accept most major insurance and offer flexible payment (self-pay $299/$179) and telehealth throughout Texas.

If you or a loved one has concerns about cognitive decline or memory loss, seek evaluation early. Early diagnosis and treatment optimize outcomes and quality of life. Contact KwikPsych at 737-367-1230 or visit 12335 Hymeadow Dr, Suite 450, Austin, TX 78750. For crisis support, call 988 Lifeline.