Major Psychiatric Disorders: Psychoses, Mood Disorders, Anxiety & Substance Use

Psychiatric disorders encompass complex disturbances in cognition, affective regulation, reality testing, and behavioral volition. For the nursing officer, clinical mastery demands an in-depth understanding of diagnostic criteria, neurochemical underpinnings, clinical manifestations, and evidence-based nursing interventions across psychoses, mood disturbances, anxiety states, and substance-induced emergencies.

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1. Schizophrenia Spectrum & Psychotic Disorders

Schizophrenia is a severe, chronic, debilitating neurodevelopmental and psychiatric disorder characterized by profound disruptions in thinking, language, perception, sense of self, and social functioning.

Etiology & Neurobiology

• Dopamine Hypothesis: Proposes that schizophrenia results from dysregulated central dopaminergic pathways:
  • Mesolimbic Pathway Hyperactivity: Excessive dopamine neurotransmission at postsynaptic D2 receptors in the mesolimbic tract underlies positive symptoms (hallucinations, delusions, thought disorganization).
  • Mesocortical Pathway Hypoactivity: Deficient dopamine neurotransmission projecting to the prefrontal cortex mediates negative symptoms (avolition, flat affect, alogia) and cognitive impairment.
• Neuroanatomical Alterations: Neuroimaging demonstrates enlargement of the lateral and third cerebral ventricles (ventriculomegaly), reduced cortical gray matter volume (especially in prefrontal and temporal lobes), and decreased hippocampal volume.
• Genetic Concordance: Monozygotic twins show a concordance rate of 40% to 50%, compared to 10% to 15% in dizygotic twins and ~1% in the general population.

Diagnostic Criteria (DSM-5 / ICD-10)

According to the DSM-5, diagnosis requires at least two of the following five core symptoms, each present for a significant portion of time during a 1-month period (or less if successfully treated), with continuous signs of disturbance persisting for at least 6 months (inclusive of prodromal and residual phases):

1. Delusions (must have at least one of 1, 2, or 3)
2. Hallucinations
3. Disorganized speech (e.g., frequent derailment or incoherence)
4. Grossly disorganized or catatonic behavior
5. Negative symptoms (e.g., affective flattening, avolition)

Kurt Schneider's First Rank Symptoms (FRS)

German psychiatrist Kurt Schneider (1959) categorized symptoms that carry extraordinary clinical and diagnostic weight for schizophrenia in the absence of organic brain pathology:

                  SCHNEIDER'S FIRST RANK SYMPTOMS (FRS)
  ┌────────────────────────────────────────────────────────────────────────┐
  │ 1. Audible Thoughts / Thought Echo (Gedankenlautwerden)                 │
  │ 2. Third-Person Auditory Hallucinations (Voices arguing/discussing)    │
  │ 3. Voices Commenting on Actions (Running commentary)                   │
  │ 4. Somatic Passivity (Bodily sensations controlled from outside)       │
  │ 5. Thought Withdrawal (Thoughts extracted from mind by external force) │
  │ 6. Thought Insertion (Alien thoughts planted into mind)                │
  │ 7. Thought Broadcasting (Thoughts radiated/projected to others)        │
  │ 8. Delusional Perception (Normal perception paired with bizarre meaning)│
  │ 9. Made Feelings / Impulses / Volitional Acts (Passivity of volition)  │
  └────────────────────────────────────────────────────────────────────────┘

Positive vs. Negative Symptoms of Schizophrenia

Schizophrenic psychopathology is functionally organized into positive and negative dimensions:

• Positive Symptoms (Distortions or Excesses of Normal Functions):
  • Associated with acute episodes, hyperdopaminergic mesolimbic states, relatively intact brain morphology, and good response to dopamine-blocking antipsychotics.
  • Features: Auditory hallucinations, persecutory and grandiose delusions, bizarre behavior, agitated catatonia, and disorganized speech (flight of ideas, neologisms).
• Negative Symptoms (Loss or Deficit of Normal Functions — The 5 "A"s):
  • Associated with chronicity, mesocortical hypodopaminergic activity, prefrontal cortical atrophy, and poor response to typical first-generation antipsychotics.
  1. Avolition / Apathy: Inability to initiate and persist in goal-directed activities (e.g., neglecting personal hygiene, inability to sustain work).
  2. Anhedonia: Inability to experience pleasure from previously enjoyable activities (hobbies, social relationships, eating).
  3. Alogia (Poverty of Speech): Marked poverty in speech production and fluency; brief, empty, uncommunicative replies.
  4. Affective Flattening / Blunting: Restricted facial expression, diminished vocal inflection, lack of expressive gestures, and poor eye contact.
  5. Asociality: Profound social withdrawal, lack of interest in interpersonal relationships, and self-isolation.

Clinical Subtypes of Schizophrenia

Historically classified in ICD-10 (and highly tested in nursing officer competitive examinations):

1. Paranoid Schizophrenia:
   • Most common clinical subtype.
   • Dominated by prominent, stable persecutory or grandiose delusions and frequent auditory hallucinations.
   • Absence of marked thought disorder, disorganized behavior, or affective flattening.
   • Onset typically occurs later in life (mid-to-late 20s or 30s).
   • Personality and cognitive abilities remain relatively preserved; exhibits the most favorable prognosis for functional recovery.
2. Hebephrenic / Disorganized Schizophrenia:
   • Onset typically early (adolescence or early adulthood, 15–25 years) with insidious progression.
   • Characterized by prominent thought disorganization, incoherent speech, and silly, giggling, incongruent, or shallow affect.
   • Marked eccentricities, facial grimacing, mirror gazing, bizarre mannerisms, and rapid deterioration of personal cleanliness and hygiene.
   • Carries the poorest long-term prognosis with rapid personality disintegration.
3. Catatonic Schizophrenia:
   • Dominated by dramatic motor anomalies that alternate between catatonic stupor and catatonic excitement:
     • Catatonic Stupor: Extreme hypokinesia, mutism, akinesis, and preservation of consciousness.
     • Waxy Flexibility (Flexibilitas Cerea): Maintaining posture when positioned by an examiner.
     • Negativism & Automatic Obedience: Resistance to all commands or robot-like compliance.
     • Echolalia (repeating words) & Echopraxia (repeating gestures).
     • Catatonic Excitement: Sudden, unprovoked, frenzied, violent motor hyperactivity requiring emergency physical and chemical management.
   • Responds remarkably well to benzodiazepines (Lorazepam) and Electroconvulsive Therapy (ECT).
4. Residual Schizophrenia: A chronic stage in the progression of schizophrenia following at least one prior acute psychotic episode, dominated by long-standing, persistent negative symptoms.
5. Simple Schizophrenia: Insidious, progressive development of negative symptoms and social deterioration over years without prior overt hallucinations or delusions.

2. Mood (Affective) Disorders

Mood disorders represent primary disturbances in emotional regulation, fluctuating between profound unipolar depressive episodes and expansive bipolar manic episodes.

Major Depressive Disorder (MDD)

Major Depressive Disorder is characterized by persistent low mood, loss of interest, and pervasive neurovegetative dysfunction.

Diagnostic Criteria (DSM-5)

Requires at least five of the following nine symptoms present nearly every day during the same 2-week period, representing a change from previous functioning; at least one symptom must be either (1) depressed mood or (2) loss of interest or pleasure (anhedonia):

1. Depressed mood for most of the day.
2. Markedly diminished interest or pleasure in all or almost all activities (anhedonia).
3. Significant unintentional weight loss or weight gain (>5% body weight in a month), or decrease/increase in appetite.
4. Insomnia (particularly terminal / early morning awakening insomnia, where the patient wakes 2 hours before expected and cannot return to sleep) or hypersomnia.
5. Psychomotor agitation or retardation noticeable by others.
6. Fatigue or loss of energy (anergia).
7. Feelings of worthlessness or excessive, inappropriate guilt.
8. Diminished ability to think, concentrate, or make simple decisions.
9. Recurrent thoughts of death, recurrent suicidal ideation, or suicide attempt.

Aaron Beck's Cognitive Triad of Depression

Cognitive psychologist Aaron Beck demonstrated that depressed individuals operate under rigid, negative automatic cognitive schemas known as the Cognitive Triad:

                     BECK'S COGNITIVE TRIAD OF DEPRESSION
  ┌────────────────────────────────────────────────────────────────────────┐
  │ 1. Negative View of the Self:                                          │
  │    "I am defective, unlovable, completely inadequate, and a failure."   │
  │ 2. Negative View of the World / Environment:                            │
  │    "The world is hostile, excessively demanding, and defeating."       │
  │ 3. Negative View of the Future:                                        │
  │    "Nothing will ever improve; hardship and suffering are permanent."   │
  └────────────────────────────────────────────────────────────────────────┘

Suicide Risk Assessment & Nursing Protocols

• Epidemiological Risk Stratification (SAD PERSONS Scale):
  • S: Sex (Male gender carries higher completed suicide rate; females attempt more frequently)
  • A: Age (<19 years or >45 years)
  • D: Depression or depressive illness
  • P: Previous suicide attempt (single strongest predictor of future completed suicide)
  • E: Ethanol or substance abuse
  • R: Rational thinking loss (psychosis, command auditory hallucinations)
  • S: Social support lacking (living alone, isolated)
  • O: Organized plan or stated intent
  • N: No spouse (divorced, separated, widowed)
  • S: Sickness (chronic, debilitating, painful physical illness)
• Direct Assessment Rule: Never hesitate to ask directly about suicidal ideation: "Are you having thoughts of harming or killing yourself? Do you have a specific plan to end your life?" Direct questioning does not plant suicidal thoughts; it provides psychological relief and validates the patient's emotional struggle.
• Crucial Clinical Warning: Suicide risk is paradoxically highest when severe depression begins to lift (e.g., 10 to 14 days after initiating antidepressant pharmacotherapy). The medication restores energy and motor initiative before alleviating underlying psychological despair, providing the physical capacity to execute a previously formulated suicide plan.
• Environmental Safety & Nursing Vigilance:
  • Maintain continuous 1:1 suicide observation or checks every 15 minutes at irregular, unpredictable intervals.
  • Remove hazards: shoelaces, belts, ties, electrical cords, glass bottles, metal cutlery, and razor blades.
  • Search all belongings brought by visitors; administer oral medications in liquid form or inspect the oral cavity to prevent medication hoarding (cheeking).

Bipolar Affective Disorder (BPAD)

Bipolar disorder is characterized by cyclical episodes of mania, hypomania, and major depression.

• Bipolar I Disorder: Defined by the occurrence of at least one manic episode. Depressive episodes are common but not required for diagnosis.
• Bipolar II Disorder: Characterized by at least one major depressive episode and at least one hypomanic episode. Full manic episodes do not occur.
• Cyclothymic Disorder: A chronic mood disturbance lasting at least 2 years with numerous periods of hypomanic symptoms and depressive symptoms that do not meet full criteria.

Mania Clinical Features — The DIG FAST Mnemonic

A distinct period of abnormally, persistently elevated, expansive, or irritable mood and increased goal-directed activity lasting at least 1 week (or any duration if hospitalization is required):

                     THE DIG FAST MNEMONIC FOR MANIA
  D ──> Distractibility (Attention easily diverted by irrelevant stimuli)
  I ──> Indiscretion / Impulsive Risk-Taking (Unrestrained spending, reckless driving)
  G ──> Grandiosity / Inflated Self-Esteem (Belief in possessing divine powers/wealth)
  F ──> Flight of Ideas / Racing Thoughts (Continuous flow of accelerated speech)
  A ──> Activity Increase (Marked increase in goal-directed energy / psychomotor agitation)
  S ──> Sleep Deficit (Decreased need for sleep; feels fully rested after 2 hours)
  T ──> Talkativeness / Pressured Speech (Loud, rapid, un-interruptible speech)

Nursing Interventions in Acute Mania

1. Environmental Regulation: Place the client in a quiet, private room away from high-traffic nurses' stations and dayrooms. Minimize noise, bright lighting, and television exposure.
2. Nutrition & Hydration: Manic clients are too hyperactive to sit for meals. Provide high-calorie, high-protein finger foods (sandwiches, hard-boiled eggs, cheese sticks) and portable nutritional shakes/juices that can be consumed while pacing.
3. Limit Setting: Establish firm, clear, non-punitive physical boundaries regarding intrusive, sexually inappropriate, or manipulative behaviors. Avoid bargaining or prolonged debates.
4. Constructive Energy Outlets: Channel excess physical energy into gross motor, non-competitive activities (e.g., walking, folding towels, cleaning activities) rather than competitive sports.

3. Anxiety, Stress-Related & Obsessive-Compulsive Disorders

Anxiety disorders represent pathological manifestations of fear and hyperarousal that impair daily functioning.

Clinical Profiles of Anxiety Disorders

• Generalized Anxiety Disorder (GAD): Excessive, uncontrollable, persistent anxiety and worry occurring more days than not for at least 6 months concerning multiple everyday life events, accompanied by muscle tension, restlessness, fatigue, difficulty concentrating, and sleep disturbance.
• Panic Disorder: Characterized by recurrent, unpredictable panic attacks—sudden surges of overwhelming terror peaking within 10 minutes, accompanied by palpitations, diaphoresis, chest pain, trembling, sensations of shortness of breath, dizziness, and intense fears of dying or "going crazy."
  • Agoraphobia: Marked fear or avoidance of situations where escape might be difficult or help unavailable during panic-like symptoms (crowds, public transport, bridges, open spaces).
• Phobic Disorders: Irrational, intense fears of specific objects or situations:
  • Behavioral Interventions:
    • Systematic Desensitization (Joseph Wolpe): Stepwise exposure to a hierarchy of feared stimuli while maintaining deep muscular relaxation (reciprocal inhibition).
    • Flooding (Implosion): Prolonged, immediate, continuous exposure to the highest-intensity phobic stimulus without relaxation until autonomic anxiety naturally extinguishes.
• Post-Traumatic Stress Disorder (PTSD): Develops following exposure to actual or threatened death, serious injury, or sexual violence. Core clinical tetrad:
  1. Intrusion: Recurrent distressing memories, flashbacks, nightmares.
  2. Avoidance: Avoiding trauma-related thoughts, feelings, places, or people.
  3. Negative Alterations in Cognition & Mood: Pervasive emotional numbness, guilt, detached affect.
  4. Hyperarousal: Hypervigilance, exaggerated startle response, insomnia, irritable outbursts.

Obsessive-Compulsive Disorder (OCD)

OCD is characterized by the presence of obsessions, compulsions, or both, which consume more than 1 hour per day and cause significant impairment:

• Obsessions: Recurrent, persistent, intrusive thoughts, urges, or mental images that cause marked anxiety or distress (e.g., contamination fears, aggressive impulses, symmetrical doubts). Recognized by the client as products of their own mind (ego-dystonic).
• Compulsions: Repetitive, purposeful behaviors (handwashing, checking, ordering) or mental acts (counting, praying) performed according to rigid rules to neutralize anxiety caused by an obsession.

Nursing Interventions in OCD

1. Initial Phase Accommodation: Upon admission, allow the patient sufficient time to complete their ritualistic behaviors. Abruptly preventing rituals induces intolerable panic and hostility.
2. Gradual Limit Setting: Collaboratively establish a structured daily schedule, gradually negotiating reduced time allocated for rituals.
3. Exposure and Response Prevention (ERP): The gold-standard behavioral technique; the client is deliberately exposed to an anxiety-inducing obsession (e.g., touching a doorknob) while refraining from executing the neutralizing compulsive ritual (e.g., washing hands).
4. Cognitive Reframing: Encourage the patient to express underlying emotional conflicts and teach progressive muscle relaxation.

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4. Substance Use Disorders & Withdrawal Emergencies

Substance use disorders involve compulsive drug-seeking behaviors and physiological adaptations leading to tolerance, psychological dependence, and life-threatening withdrawal syndromes.

Alcohol Dependence & Withdrawal Syndromes

Chronic alcohol consumption alters neurotransmission by down-regulating inhibitory GABA receptors and up-regulating excitatory NMDA glutamate receptors. Sudden cessation removes the central depressive brake, triggering severe, uninhibited central sympathetic hyperactivity.

                  ALCOHOL WITHDRAWAL CLINICAL TIMELINE
  ┌────────────────────────────────────────────────────────────────────────┐
  │ 6 – 24 Hours:  Tremors, sweating, tachycardia, insomnia, anxiety        │
  │ 12 – 48 Hours: Alcohol withdrawal seizures ("rum fits" - tonic-clonic) │
  │ 48 – 72 Hours: DELIRIUM TREMENS (DTs) - Medical Emergency              │
  │                Visual/tactile hallucinations, fever, collapse risk      │
  └────────────────────────────────────────────────────────────────────────┘

Delirium Tremens (DTs) — Clinical Tetrad & Emergency Protocols

Delirium Tremens is the most severe, fatal manifestation of alcohol withdrawal, occurring in 5% of dependent individuals, peaking between 48 and 72 hours after the last drink:

1. Clinical Manifestations:
   • Severe, acute global clouding of consciousness and spatial/temporal disorientation.
   • Autonomic storm: High fever, profuse diaphoresis, severe tachycardia (>120 bpm), hypertension, tachypnea.
   • Coarse, irregular generalized body tremors.
   • Vivid, terrifying visual and tactile hallucinations (formication: sensation of bugs, beetles, or insects crawling across or beneath the skin; seeing terrifying animals or miniature people — lilliputian hallucinations).
2. Emergency Nursing & Medical Management:
   • Administer intravenous or oral long-acting Benzodiazepines (Chlordiazepoxide, Diazepam; or Lorazepam in hepatic dysfunction) titrated against objective withdrawal scores (CIWA-Ar).
   • Maintain a quiet, well-illuminated room to minimize shadows and misperceptions (illusions).
   • Correct fluid and electrolyte imbalances (hypokalemia, hypomagnesemia).
3. The Vital Thiamine Administration Rule:
   • Administer Parenteral Thiamine (Vitamin B1, 100–500 mg IV/IM) BEFORE any intravenous dextrose or carbohydrate infusion!
   • Pathophysiological Rationale: Infusing glucose into a thiamine-deficient client rapidly exhausts residual thiamine pyrophosphate coenzymes during glycolysis and pyruvate oxidation, precipitating acute Wernicke's Encephalopathy.

Wernicke-Korsakoff Syndrome

• Wernicke's Encephalopathy (Acute & Reversible): Characterized by the classical clinical triad:
  1. Ophthalmoplegia / Nystagmus (abducens nerve paralysis, involuntary horizontal eye movements)
  2. Ataxia (broad-based, unsteady cerebellar gait)
  3. Global Confusion & Altered Mental Status
• Korsakoff's Psychosis (Chronic & Irreversible): Consequence of untreated Wernicke's encephalopathy causing necrotic damage to the mammillary bodies and thalamus. Characterized by severe anterograde and retrograde amnesia with prominent confabulation (fabricating detailed, plausible stories to unconsciously fill gaps in memory).

Opioid Toxicity & Overdose Management

• Clinical Triad of Acute Opioid Overdose:
  1. Pinpoint Pupils (Miosis): Severe pupillary constriction (dilates only in terminal anoxia).
  2. Severe Respiratory Depression: Bradypnea (<8–10 breaths/min), shallow breathing, cyanosis.
  3. Central Nervous System Depression: Stupor, unresponsiveness, coma.
• Emergency Antidote: Naloxone (Narcan): Pure opioid antagonist administered 0.4 to 2.0 mg IV, IM, SC, or intranasally. Reverses respiratory arrest within 1 to 2 minutes.
• Critical Nursing Rule: The duration of action of naloxone (30 to 90 minutes) is substantially shorter than that of most opioids (e.g., morphine, methadone). The nurse must maintain continuous respiratory monitoring for at least 4 to 24 hours to detect rebound respiratory arrest as naloxone clears.

5. Clinical Master Matrices

Schizophrenia Subtypes, Psychopathological Hallmarks & Clinical Prognosis

Mania (DIG FAST) vs. Major Depression (Beck's Triad) Master Matrix