Altered Mental Status (AMS)

What is an Altered Mental Status?

Altered Mental Status (AMS) refers to a significant disturbance in a person’s perception, thinking, memory, or level of consciousness. The condition often presents as abnormal psychological symptoms or noticeable changes in behavior. It may result from underlying physical conditions such as injury, infection, or chemical imbalances in the body.

Although altered mental status may resemble conditions seen in certain psychiatric disorders, it is a broad clinical term used to describe a group of symptoms indicating impaired brain function, which requires a thorough medical evaluation to identify the root cause.

What are the types of AMS?

1. Delirium (The Emergency)
   

   Delirium is a sudden alteration in mental status that often stems from dehydration, infection (e.g., a urinary tract infection in seniors, or organ failure. It is a medical emergency that requires prompt evaluation and treatment. If the underlying cause is uncovered and treated properly, the condition could be reversible.
   
   Signs: Severe confusion, inability to focus, and agitation.

2. Dementia (The Progressive Decline)

   Dementia is a long-term, progressive deterioration of cognitive ability. It is most common in older populations and interferes with a person's ability to navigate daily life independently. It is generally chronic and worsens over time.
   
   Signs: Memory loss, difficulty communicating, loss of one’s identity or surroundings.

3. Psychosis (The Loss of Reality)                                             

   Psychosis is a condition in which a person loses touch with reality, causing their perception of the world to become distorted. Certain medications, substance use, or acute medical conditions may trigger the condition. In many cases, psychosis is temporary and can improve with appropriate treatment.
   
   Signs: Hallucinations (seeing or hearing things that are not actually present) and delusions (fixed false beliefs that persist despite evidence to the contrary)

What are the signs and symptoms of AMS?

• Reduced Consciousness: Ranging from lethargy to a coma.
• Disorientation: Confusion regarding time, current location, or one's own identity.
• Memory Gaps: Sudden forgetfulness or amnesia.
• Speech Issues: Using nonsensical words, slurring, or responding very slowly to questions.
• Perceptual Breaks: Hallucinations or delusions.
• Agitation: High irritability, restlessness, or sudden aggression.
• Mood Swings: Unexplained euphoria, sudden depression, or extreme anxiety.
• Social Withdrawal: Abruptly stopping interaction with others or behaving in socially bizarre ways.
• Energy Extremes: Profound exhaustion or, conversely, uncontrollable hyperactivity.
• Breathing Distress: Shortness of breath or labored respiration.
• Motor Control: Sudden clumsiness or a lack of physical coordination.

What are the causes of altered mental status?

1. Neurological Problems

   
   
   • Structural Damage: Strokes, hemorrhages, tumors, or traumatic brain injuries 
   • Pressure & Fluid: Obstructive hydrocephalus or swelling
   • Electrical/Systemic: Seizures or hepatic encephalopathy

2. Metabolic & Chemical Imbalances

   
   
   • Fuel & Oxygen: Hypoglycemia or hypoxemia
   • Electrolyte Deficit: Hyponatremia or hypocalcemia 
   • Environment & Hydration: Severe dehydration or hypothermia
   • Endocrine: Hypothyroidism

3. Infections

    
   
   • Systemic Infection: Urinary tract infections or pneumonia
   • Brain Infection: Meningitis or encephalitis 

4. Toxicity and Medications

   
   
   • Anticholinergics (used for muscle movements)
   • Corticosteroids (can cause "steroid psychosis")
   • Sedatives & Sleep Aids (often have a paradoxical effect on older adults)
   • Antiseizure medications
   • Substance Use: Overdose or acute withdrawal from alcohol, opioids, or other controlled substances.

5. Critical System Failures

   • Shock: Cardiogenic shock or septic shock.
   • Organ Failure: Advanced kidney or liver dysfunction.

What are the diagnostic tests for AMS?

1. The Emergency "ABCDE" Screen
   
   • A - Airway: Ensuring the path for air is clear and unobstructed.
   • B - Breathing: Using a stethoscope to listen to signs of lung infections or fluid buildup.
   • C - Circulation: Monitoring heart rate, rhythm, and blood pressure to ensure the brain is receiving enough blood.
   • D - Disability: Evaluating pupillary reactivity, responsiveness, and unilateral weakness, which may suggest a stroke.
   • E - Exposure: A full-body check for hidden clues, such as head injuries, rashes, or medicated skin patches that might be exerting toxicity.
2. The Clinical Interview
   
   • Since the patient may be unable to speak for themselves, doctors often depend on family members or caregivers to provide a timeline of the symptoms.
   • What is the person's normal cognitive level?
   • Did this happen over minutes (stroke), hours (infection), or years (dementia)?
   • Has the patient started any new medications, changed the dosage, or stopped taking any medications?

What are the treatment modalities for AMS?

1. Metabolic & Chemical Stabilization

   
   
   • Hypoglycemia: Injections of Glucagon or concentrated glucose solution to raise blood glucose levels.
   • Dehydration: Administration of Intravenous fluids to restore the bodily fluid balance.
   • Hypoxia: Delivery of supplemental oxygen to augment oxygen delivery to the brain.

2. Infection & Toxin Neutralization

   
   
   • Infections (UTIs, Pneumonia): Targeted antibiotics to fight the infection.
   • Narcotic Overdose: Emergency use of Naloxone (Narcan) to reverse respiratory failure.
   • Medication Reactions: Discontinuing or swapping high-risk prescription drugs that cause delirium.

3. Neurological & Structural Repair

   
   
   • Seizures: Rescue medications (anticonvulsants) to stop active episodes.
   • Brain Pressure: Emergency surgery to drain fluid, remove tumors, or stop hemorrhages.
   • Strokes: Specialized medications to dissolve clots and restore blood flow.

4. Behavioral Management
   

   To ensure patient safety during a crisis:
   • Agitation/Psychosis: Short-term use of anxiolytics or antipsychotics to manage severe confusion or combativeness.

What can I do to prevent an altered mental status?

While some causes of AMS, like dementia, are unavoidable, many others are preventable through careful health management.

• Manage chronic conditions. Strictly follow treatment plans for diabetes, epilepsy, and thyroid disorders.
• Take prescriptions exactly as directed. 
• Avoid illicit drugs and limit alcohol to prevent toxicity, acute psychosis, or dangerous withdrawal symptoms.

Living with someone experiencing AMS

1. Temporary Episodes (Delirium & Psychosis)

   Once the underlying cause is under treatment, most patients can return to their normal daily activities. Some individuals may continue to experience mild fatigue or brain fog. Many patients also have little or no memory of the events that occurred during the episode. Avoiding potential triggers, such as certain medications or poorly controlled blood glucose levels in people with diabetes, may help prevent recurrence.

2. Chronic conditions (Dementia)

   
   For AMS associated with dementia, care primarily focuses on modifying the environment to support daily living. These may include using memory aids, establishing structured daily routines, and adapting the home environment to enhance safety. Over time, however, patients may require increasing assistance from caregivers as their cognitive and thinking abilities gradually decline.

A note from MedPark’s doctor

Altered mental status (AMS) is a state of changes in brain function that alters a person's awareness, thinking, or behavior. It is typically a secondary symptom of an underlying medical crisis, infection, or neurological injury. Sudden mental changes are often the first sign of a life-threatening emergency. Therefore, prompt medical evaluation is essential to identify the underlying cause and prevent permanent brain damage.