Delirium tremens

Delirium tremens is the most severe manifestation of withdrawal syndrome in individuals with chronic alcoholism who abruptly stop alcohol consumption.

Symptoms and causes

Delirium tremens (DT) is the most severe form of withdrawal syndrome. Alcohol dependence is so significant that, when consumption is abruptly discontinued, severe medical complications may arise, potentially leading to death.

In general, delirium tremens affects individuals with chronic alcohol addiction who develop cognitive, behavioral, and physical disturbances within the first 48 to 96 hours after cessation. The most critical symptoms typically occur at 72 hours. In some cases, although less common, signs may appear several days later.

The estimated mortality rate for delirium tremens or its associated complications is approximately 5% in treated patients but may rise to 40% if left untreated. Therefore, early diagnosis is essential for a favorable prognosis.

Symptoms

Symptoms of delirium tremens typically develop progressively in three distinct stages:

Initial phase: begins 5–6 hours after the last alcoholic drink.

Tremors: intense shaking of the hands and often other extremities.
Anxiety.
Insomnia.
Excessive sweating.
Pallor.
Nausea and vomiting.

Acute (intermediate) phase: occurs approximately 15–30 hours after the last intake. This is the most severe stage.

Worsening of initial phase symptoms.
Hallucinations: so vivid that they provoke panic and agitation.

Visual: seeing people, insects, shadows, or undefined figures.
Auditory: hearing voices, typically threatening.
Tactile: sensations of itching or insects crawling on the body.

Severe confusion: spatial, temporal, or personal disorientation, with loss of self-recognition.
Tachycardia: increased heart rate.
Tachypnea: increased respiratory rate.
Hypertension.
Fever.
Pupillary dilation.
Rapid mood changes.
Restlessness or deep sleep.
Increased sensitivity to touch, sound, or light.

Resolution (final) phase: this critical phase usually begins 48–72 hours after the last alcohol intake. In treated patients, symptoms gradually decrease in intensity but may persist for several days or weeks before complete resolution.

Causes

Delirium tremens is caused by alcohol withdrawal in patients with chronic alcoholism. Because the body is accustomed to alcohol—an agent with central nervous system depressant effects—its sudden absence leads to a neurochemical imbalance in the brain that triggers symptoms (decreased GABA activity and increased glutamate activity).

This neurochemical imbalance primarily affects:

GABA system (gamma-aminobutyric acid): an inhibitory neurotransmitter in the central nervous system responsible for reducing excessive neuronal activity.
Glutamate: an excitatory neurotransmitter that regulates neuronal plasticity and cellular excitability.

Risk factors

The risk of delirium tremens is higher in the following situations:

Excessive and prolonged alcohol consumption.
Abrupt cessation: although it may result from a patient’s decision to stop drinking, it commonly occurs in emergency situations or during hospitalization.
History of delirium tremens: individuals with previous episodes are at increased risk of recurrence.
Presence of infections, liver disease, or recent trauma at the time of alcohol cessation.
History of seizures.

Complications

Delirium tremens may lead to severe complications, including:

Seizures.
Heart failure.
Loss of consciousness or coma.
Hyperthermia: very high fever indicating severe autonomic dysfunction.
Physical stress: systemic strain leading to the release of adrenaline and cortisol.
Dehydration: excessive sweating, vomiting, hypertension, and tachycardia promote fluid loss and subsequent electrolyte imbalance.
Traumatic injuries: due to agitation and hallucinations.
Sepsis: systemic infection potentially related to stress and dehydration.
Permanent brain damage.
Death.

Which specialist treats delirium tremens?

Delirium tremens is managed within the specialties of Emergency department, Internal medicine, and Psychiatry.

Diagnosis

Diagnosis of delirium tremens typically involves a physical examination. Once the clinician is aware of abrupt alcohol cessation, they assess for key clinical signs, such as:

Sweating.
Irregular heartbeat.
Abnormal eye movements.
Labored breathing.
Muscle tremors.
Exaggerated startle reflex.
Fever.
Tachycardia.

To confirm the diagnosis, determine severity, or exclude other conditions with similar symptoms, additional tests are often performed:

Clinical Institute Withdrawal Assessment for Alcohol (CIWA-Ar): a 10-item scale scored according to symptom severity (0–67) to assess withdrawal severity.
Blood tests: essential for evaluating potential complications. They provide information on red and white blood cell counts, iron, and glucose levels, as well as evidence of electrolyte imbalance (e.g., low potassium or magnesium), hepatic dysfunction, or renal impairment.
Toxicology screening: demonstrates absence or reduction of blood alcohol levels and detects other toxic substances.
Electrocardiogram (ECG): monitors cardiac function to detect arrhythmias and assess the risk of sudden death.
Electroencephalogram (EEG): records brain activity to rule out seizures, infections, metabolic disorders, or subdural hematomas.
Cranial CT scan: used to exclude intracranial hemorrhage, hematomas, or infections.
Lumbar puncture: performed to rule out meningitis.

Delirium tremens is a medical emergency requiring immediate treatment in a healthcare facility. Initial management includes:

Rehydration: intravenous fluids are administered to restore electrolyte balance.
Medication: pharmacological treatment focuses on preventing complications:

Benzodiazepines: control agitation and prevent seizures.
Antipsychotics: reduce hallucinations and severe agitation.
Sedatives: stabilize the patient’s condition, reduce seizure risk, and control agitation.
Vitamin supplementation: vitamin B1 (thiamine) and magnesium help correct dehydration, electrolyte imbalances, and neurological disturbances.