Pain and Its Modulation - MPT Level Master Guide

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// ── COVER PAGE ────────────────────────────────────────────────────────────────
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          new Paragraph({ children: [new TextRun({ text: '1. Definition & Dimensions   2. Pain Fibers   3. Transmission Pathway', size: 19, font: 'Calibri', color: C.gray })], alignment: AlignmentType.CENTER }),
          new Paragraph({ children: [new TextRun({ text: '4. Peripheral Sensitization   5. Clinical Types   6. Referred & Phantom Pain', size: 19, font: 'Calibri', color: C.gray })], alignment: AlignmentType.CENTER }),
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// ── SECTION 1: Definition ─────────────────────────────────────────────────────
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  heading1('1. Introduction – Definition of Pain'),
  para('Pain is defined by the IASP as:'),
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  bullet('Pain is NOT simply a nerve impulse – it is a multidimensional experience'),
  bullet('Shaped by: sensory input, emotional state, attention, past experience, cultural context'),
  bullet('Functions as a warning signal – promotes withdrawal, guarding, and rest'),
  divider(),
];

// ── SECTION 2: Dimensions ─────────────────────────────────────────────────────
const sec2 = [
  heading1('2. Three Dimensions of Pain'),
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      altRow(['Motivational-Affective', 'Unpleasantness, fear, distress, urge to escape', 'Limbic system – ACC, Amygdala'], 1),
      altRow(['Cognitive-Evaluative', 'Meaning based on past experience, culture, attention', 'Prefrontal cortex'], 0),
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  note('Exam tip: "Why does the same injury hurt differently?" → Motivational-affective + Cognitive-evaluative dimensions'),
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];

// ── SECTION 3: Pain Fibers ────────────────────────────────────────────────────
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  heading1('3. Pain Fibers – The Peripheral Hardware'),
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        cell('5–30 m/s (fast)', { bg: C.lred }),
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        cell('Touch, pressure – NOT pain', { bg: C.lgreen }),
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  note('Clinical: Rubbing injured area activates A-beta → closes gate → reduces pain. Basis of TENS & massage!'),
  divider(),
];

// ── SECTION 4: Transmission Pathway Flowchart ─────────────────────────────────
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  flowBox('NOXIOUS STIMULUS\n(Mechanical / Thermal / Chemical)', C.lred, C.red),
  arrow(),
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  arrow(),
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  flowBox('DORSAL ROOT GANGLION\n(Cell body of 1st-order neuron)', C.lteal, C.teal),
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  flowBox('DECUSSATION\n(Crosses to opposite side of spinal cord)', C.yellow, C.amber),
  arrow(),
  flowBox('SPINOTHALAMIC TRACT (Anterolateral System)\nAscends to brain', C.yellow, C.amber),
  arrow(),
  flowBox('THALAMUS\n(Relay station)', C.lpurple, C.purple),
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  flowBox('SOMATOSENSORY CORTEX → Localization & Perception\n+ LIMBIC SYSTEM → Emotional coloring\n+ PREFRONTAL CORTEX → Interpretation', C.lgreen, C.green),

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      altRow(['Wide Dynamic Range (WDR)', 'Both painful + non-painful', 'Lamina V', 'Pain integration, sensitization, gate'], 1),
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// ── SECTION 5: Peripheral Sensitization ──────────────────────────────────────
const sec5 = [
  heading1('5. Peripheral Sensitization & Hyperalgesia'),
  heading2('Inflammatory Mediators Released on Tissue Injury'),
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      headerRow(['Mediator', 'Source', 'Effect on Nociceptor']),
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      altRow(['Prostaglandins (PGE2)', 'Arachidonic acid (COX pathway)', 'Lowers activation threshold'], 1),
      altRow(['Histamine', 'Mast cells', 'Direct activation'], 0),
      altRow(['Serotonin (5-HT)', 'Platelets', 'Sensitization'], 1),
      altRow(['K⁺ / H⁺ ions', 'Damaged cells', 'Depolarize nociceptors'], 0),
      altRow(['Substance P', 'Primary afferents (antidromic)', 'Neurogenic inflammation, sensitization'], 1),
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  heading2('Result of Sensitization'),
  bullet('Hyperalgesia – exaggerated pain response to a normally painful stimulus'),
  bullet('Allodynia – pain in response to a normally NON-painful stimulus'),
  bullet('Expanded receptive field – wider area of tenderness'),
  note('Peripheral sensitization = change at the RECEPTOR level\nCentral sensitization = change at the SPINAL CORD/BRAIN level (distinguish these!)'),
  divider(),
];

// ── SECTION 6: Clinical Types ─────────────────────────────────────────────────
const sec6 = [
  heading1('6. Clinical Types of Pain'),
  heading2('Acute vs. Chronic Pain'),
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      headerRow(['Feature', 'Acute Pain', 'Chronic Pain']),
      altRow(['Purpose', 'Protective warning signal', 'Often loses protective role'], 0),
      altRow(['Duration', 'Short, resolves with healing', '> 3–6 months, persists after healing'], 1),
      altRow(['Behavior', 'Restless, anxious, guarding', 'Withdrawn, depressed, pain behavior absent'], 0),
      altRow(['Autonomic signs', 'Tachycardia, hypertension,\ndilated pupils, sweating', 'Often minimal or absent'], 1),
      altRow(['Neural basis', 'Active nociception', 'Neural dysfunction, central sensitization'], 0),
      altRow(['Emotional state', 'Fear, anxiety', 'Depression, helplessness, catastrophizing'], 1),
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  heading2('Other Pain Types'),
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      headerRow(['Type', 'Definition', 'Mechanism/Example']),
      altRow(['Somatogenic', 'Origin in body tissue (musculoskeletal, visceral)', 'Fracture, arthritis, muscle tear'], 0),
      altRow(['Neurogenic/Neuropathic', 'Damage to nervous tissue itself', 'Diabetic neuropathy, sciatica, post-herpetic neuralgia'], 1),
      altRow(['Psychogenic', 'Psychological origin, no clear tissue damage', 'Somatoform disorder, amplified pain'], 0),
      altRow(['Referred Pain', 'Felt distant from actual source', 'Cardiac ischemia → left arm/jaw; viscero-somatic convergence'], 1),
      altRow(['Phantom Pain', 'Pain in absent/amputated limb', 'Cortical map reorganization + central sensitization'], 0),
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  heading2('Referred Pain – Mechanism', C.orange),
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        para('Visceral afferents + somatic afferents CONVERGE on the same dorsal horn neuron'),
        para('→ Brain MISINTERPRETS the origin of the signal as coming from the somatic area'),
        para('Classic example: Myocardial ischemia (cardiac pain) → left arm, jaw, upper chest (levels C8-T4)'),
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  new Paragraph({ spacing: { before: 80 } }),
  divider(),
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// ── SECTION 7: Gate Control Theory ───────────────────────────────────────────
const sec7 = [
  heading1('7. Gate Control Theory (Melzack & Wall, 1965)'),
  heading2('THE MOST IMPORTANT THEORY – Learn This Cold'),
  para('The "gate" is located in the substantia gelatinosa (Lamina II) of the spinal dorsal horn.'),
  para('It controls how much nociceptive signal passes up to the brain.'),
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          shading: { type: ShadingType.CLEAR, color: 'auto', fill: C.white },
          margins: { top: 100, bottom: 100 },
        }),
        new TableCell({
          children: [
            new Paragraph({ children: [new TextRun({ text: 'INHIBITORY\nINTERNEURON\n(Substantia Gelatinosa)', bold: true, size: 20, color: C.white, font: 'Calibri' })], alignment: AlignmentType.CENTER, spacing: { before: 60, after: 60 } }),
            new Paragraph({ children: [new TextRun({ text: 'Large fibers ACTIVATE this neuron', size: 18, color: C.white, font: 'Calibri', italics: true })], alignment: AlignmentType.CENTER }),
          ],
          shading: { type: ShadingType.CLEAR, color: 'auto', fill: C.blue },
          margins: { top: 100, bottom: 100, left: 120, right: 120 },
          borders: { top: { style: BorderStyle.SINGLE, size: 6, color: C.blue }, bottom: { style: BorderStyle.SINGLE, size: 6, color: C.blue }, left: { style: BorderStyle.SINGLE, size: 6, color: C.blue }, right: { style: BorderStyle.SINGLE, size: 6, color: C.blue } }
        }),
        new TableCell({
          children: [new Paragraph({ children: [new TextRun({ text: '→', size: 36, color: C.green, font: 'Calibri', bold: true })], alignment: AlignmentType.CENTER })],
          shading: { type: ShadingType.CLEAR, color: 'auto', fill: C.white },
          margins: { top: 100, bottom: 100 },
        }),
        new TableCell({
          children: [
            new Paragraph({ children: [new TextRun({ text: 'GATE CLOSED', bold: true, size: 22, color: C.white, font: 'Calibri' })], alignment: AlignmentType.CENTER, spacing: { before: 60, after: 20 } }),
            new Paragraph({ children: [new TextRun({ text: 'Pain transmission SUPPRESSED', size: 19, color: C.white, font: 'Calibri' })], alignment: AlignmentType.CENTER }),
          ],
          shading: { type: ShadingType.CLEAR, color: 'auto', fill: C.teal },
          margins: { top: 100, bottom: 100, left: 120, right: 120 },
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        }),
      ]}),
    ]
  }),
  new Paragraph({ spacing: { before: 120 } }),
  heading2('Inhibitory Neurotransmitters at the Gate'),
  bullet('GABA (GABA-B receptor – baclofen) – segmental inhibition'),
  bullet('Glycine – increases Cl⁻ conductance → hyperpolarization'),
  bullet('Adenosine – A1 receptor mediates antinociception'),
  new Paragraph({ spacing: { before: 100 } }),
  heading2('Clinical Applications of Gate Control', C.orange),
  new Table({
    width: { size: 100, type: WidthType.PERCENTAGE },
    rows: [
      headerRow(['Intervention', 'Fiber Activated', 'Gate Effect']),
      altRow(['Rubbing / stroking', 'A-beta (touch)', 'Closes gate → reduces pain'], 0),
      altRow(['Vibration therapy', 'A-beta (mechanoreceptors)', 'Closes gate → segmental inhibition'], 1),
      altRow(['High-frequency low-intensity TENS', 'A-beta', 'Closes gate (segmental)'], 0),
      altRow(['Brief intense TENS', 'A-delta + A-beta', 'Peripheral block + gate closure'], 1),
      altRow(['Massage', 'A-beta (large fibers)', 'Closes gate + peripheral effects'], 0),
      altRow(['Cold/hot therapy', 'Mixed', 'Peripheral + segmental effects'], 1),
      altRow(['Interferential current', 'A-beta', 'Segmental gate closure'], 0),
    ]
  }),
  new Paragraph({ spacing: { before: 100 } }),
  divider(),
];

// ── SECTION 8: Descending Inhibitory Pathways ─────────────────────────────────
const sec8 = [
  heading1('8. Descending Inhibitory Pathways'),
  heading2('Top-Down Pain Suppression System'),
  new Paragraph({ spacing: { before: 60 } }),
  heading2('FLOWCHART: Descending Inhibitory Pathway', C.blue),

  flowBox('CORTEX + LIMBIC SYSTEM\n(Prefrontal Cortex, ACC, Amygdala, Thalamus)\nCognitive & emotional pain modulation', C.lpurple, C.purple),
  arrow(),
  flowBox('PERIAQUEDUCTAL GRAY (PAG)\nMidbrain\nKey relay station – stimulation produces widespread analgesia', C.lblue, C.navy),
  arrow(),
  new Table({
    width: { size: 80, type: WidthType.PERCENTAGE },
    alignment: AlignmentType.CENTER,
    rows: [new TableRow({ children: [
      new TableCell({
        children: [new Paragraph({ children: [new TextRun({ text: 'NUCLEUS RAPHE MAGNUS (NRM)\nRostral Ventromedial Medulla\n→ Serotonergic pathway', bold: true, size: 19, color: C.white, font: 'Calibri' })], alignment: AlignmentType.CENTER, spacing: { before: 80, after: 80 } })],
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        margins: { top: 80, bottom: 80 }
      }),
      new TableCell({
        children: [new Paragraph({ children: [new TextRun({ text: 'LOCUS COERULEUS\nDorsolateral Pons\n→ Noradrenergic pathway', bold: true, size: 19, color: C.white, font: 'Calibri' })], alignment: AlignmentType.CENTER, spacing: { before: 80, after: 80 } })],
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      }),
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  }),
  arrow(),
  flowBox('DORSAL HORN – SPINAL CORD\nPre-synaptic inhibition (↓ Substance P, glutamate release)\n+ Post-synaptic inhibition of 2nd-order neurons', C.lgreen, C.green),
  arrow(),
  flowBox('PAIN SUPPRESSED\nReduced ascending nociceptive transmission', C.lgreen, C.green, true),

  new Paragraph({ spacing: { before: 140 } }),
  heading2('Three Descending Neurotransmitter Pathways'),
  new Table({
    width: { size: 100, type: WidthType.PERCENTAGE },
    rows: [
      headerRow(['Pathway', 'Transmitter', 'Receptor', 'Origin', 'Mechanism']),
      new TableRow({ children: [
        cell('Serotonergic', { bg: C.lteal, bold: true, color: C.teal }),
        cell('Serotonin (5-HT)', { bg: C.lteal }),
        cell('5-HT receptors', { bg: C.lteal }),
        cell('NRM → dorsal horn\n(dorsolateral funiculus)', { bg: C.lteal }),
        cell('Inhibits dorsal horn neurons', { bg: C.lteal }),
      ]}),
      new TableRow({ children: [
        cell('Noradrenergic', { bg: C.lpurple, bold: true, color: C.purple }),
        cell('Norepinephrine (NE)', { bg: C.lpurple }),
        cell('α2-adrenergic', { bg: C.lpurple }),
        cell('Locus coeruleus → dorsal horn', { bg: C.lpurple }),
        cell('Pre/post-synaptic inhibition', { bg: C.lpurple }),
      ]}),
      new TableRow({ children: [
        cell('Opioidergic', { bg: C.lgreen, bold: true, color: C.green }),
        cell('β-endorphin, Enkephalins, Dynorphins', { bg: C.lgreen }),
        cell('μ, δ, κ opioid receptors', { bg: C.lgreen }),
        cell('PAG, NRM, Locus coeruleus, Dorsal horn', { bg: C.lgreen }),
        cell('↓ Substance P + glutamate; hyperpolarizes neurons', { bg: C.lgreen }),
      ]}),
    ]
  }),
  new Paragraph({ spacing: { before: 100 } }),
  heading2('Endogenous Opioids'),
  bullet('Beta-endorphin – from hypothalamus/pituitary; released by exercise, stress'),
  bullet('Enkephalins (met-enkephalin, leu-enkephalin) – in dorsal horn, NRM'),
  bullet('Dynorphins – in dorsal horn and limbic system'),
  note('All endogenous opioids are ANTAGONIZED by naloxone – this is why naloxone can partially reverse placebo analgesia'),
  new Paragraph({ spacing: { before: 80 } }),
  heading2('Clinical Significance of Descending Inhibition'),
  new Table({
    width: { size: 100, type: WidthType.PERCENTAGE },
    rows: [
      headerRow(['Clinical Application', 'Mechanism via Descending Inhibition']),
      altRow(['Low-frequency high-intensity TENS\n(Acupuncture-like TENS)', 'Activates PAG → opioid release'], 0),
      altRow(['Acupuncture', 'Supraspinal opioid release via PAG/NRM activation'], 1),
      altRow(['Tricyclic antidepressants (amitriptyline)', 'Block reuptake of serotonin + NE → enhance descending inhibition'], 0),
      altRow(['SNRIs (duloxetine)', 'Same mechanism – serotonin + NE reuptake inhibition'], 1),
      altRow(['Exercise-induced analgesia', 'β-endorphin release from hypothalamus'], 0),
      altRow(['Placebo analgesia', 'Real opioid-mediated PAG activation (reversible by naloxone)'], 1),
      altRow(['UV radiation / counter-irritation', 'Supraspinal descending opioid activation'], 0),
    ]
  }),
  new Paragraph({ spacing: { before: 100 } }),
  divider(),
];

// ── SECTION 9: Cortical Modulation ────────────────────────────────────────────
const sec9 = [
  heading1('9. Cortical Modulation & Psychological Influence'),
  heading2('The Brain as an Active Pain Modulator'),
  para('The brain is NOT a passive receiver – it actively amplifies or suppresses pain through top-down control.'),
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  new Table({
    width: { size: 100, type: WidthType.PERCENTAGE },
    rows: [
      headerRow(['AMPLIFIES Pain ↑', 'SUPPRESSES Pain ↓']),
      altRow(['Fear and anxiety', 'Reassurance and education'], 0),
      altRow(['Attention and hypervigilance', 'Distraction and positive focus'], 1),
      altRow(['Catastrophizing', 'Relaxation and mindfulness'], 0),
      altRow(['Depression', 'Positive coping strategies'], 1),
      altRow(['Negative past experience', 'Placebo (opioid-mediated)'], 0),
      altRow(['Stress (acute or chronic)', 'Exercise (endorphin release)'], 1),
    ]
  }),
  new Paragraph({ spacing: { before: 100 } }),
  heading2('PET Imaging Evidence'),
  new Table({
    width: { size: 90, type: WidthType.PERCENTAGE },
    alignment: AlignmentType.CENTER,
    rows: [new TableRow({ children: [new TableCell({
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        para('Subjects hypnotized to feel HOT water as "not painful":'),
        bullet('NO difference in somatosensory cortex activation'),
        bullet('Significantly LESS activation in Anterior Cingulate Cortex (ACC)'),
        para('→ Proves the emotional/cognitive component modulates pain at the brain level'),
      ],
      shading: { type: ShadingType.CLEAR, color: 'auto', fill: C.lteal },
      margins: { top: 80, bottom: 80, left: 160, right: 160 },
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    })] })]
  }),
  new Paragraph({ spacing: { before: 100 } }),
  heading2('Cortical Modulation Interventions'),
  bullet('Cognitive Behavioral Therapy (CBT) – restructures catastrophic thoughts'),
  bullet('Graded Exposure Therapy – addresses fear-avoidance in chronic pain'),
  bullet('Patient Education – reduces fear and uncertainty about pain'),
  bullet('Relaxation techniques – reduces limbic activation'),
  bullet('Mindfulness-based stress reduction (MBSR)'),
  note('These have MEASURABLE PHYSIOLOGICAL effects on descending inhibitory pathways – not just psychology!'),
  divider(),
];

// ── SECTION 10: Physiotherapy Framework ──────────────────────────────────────
const sec10 = [
  heading1('10. Pain Modulation – Physiotherapy Framework'),
  heading2('Four Levels of Intervention'),
  new Table({
    width: { size: 100, type: WidthType.PERCENTAGE },
    rows: [
      headerRow(['Level', 'Target', 'Mechanism', 'Clinical Examples'], C.navy),
      new TableRow({ children: [
        cell('PERIPHERAL', { bg: C.lred, bold: true, color: C.red }),
        cell('Nociceptors\nInflammatory mediators', { bg: C.lred }),
        cell('Reduce chemical mediators\nDecrease tissue irritation', { bg: C.lred }),
        cell('NSAIDs, ice, compression,\nultrasound, PEME, massage', { bg: C.lred }),
      ]}),
      new TableRow({ children: [
        cell('SPINAL\nSEGMENTAL', { bg: C.lpurple, bold: true, color: C.purple }),
        cell('Dorsal horn gate\nA-beta activation', { bg: C.lpurple }),
        cell('Gate control (large fiber)\nPhysiological conduction block', { bg: C.lpurple }),
        cell('High-freq TENS, vibration,\nmanual therapy, brief intense TENS,\ninterferential current', { bg: C.lpurple }),
      ]}),
      new TableRow({ children: [
        cell('SUPRASPINAL', { bg: C.lblue, bold: true, color: C.blue }),
        cell('PAG → NRM\nDescending inhibition', { bg: C.lblue }),
        cell('Opioid/serotonin/NE release\nCounter-irritation', { bg: C.lblue }),
        cell('Acupuncture, low-freq TENS,\nUV radiation, counter-irritation,\nplacebo, didynamic current', { bg: C.lblue }),
      ]}),
      new TableRow({ children: [
        cell('CORTICAL', { bg: C.lgreen, bold: true, color: C.green }),
        cell('Prefrontal cortex\nLimbic system', { bg: C.lgreen }),
        cell('Cognitive restructuring\nAttention + fear modulation', { bg: C.lgreen }),
        cell('CBT, graded exposure,\neducation, relaxation,\ntherapist interaction', { bg: C.lgreen }),
      ]}),
    ]
  }),
  new Paragraph({ spacing: { before: 100 } }),
  divider(),
];

// ── SECTION 11: Modulation Summary Flowchart ─────────────────────────────────
const sec11 = [
  heading1('11. Complete Pain Modulation – Summary Flowchart'),
  new Paragraph({ spacing: { before: 80 } }),

  flowBox('NOXIOUS STIMULUS', C.lred, C.red),
  arrow(),

  new Table({
    width: { size: 90, type: WidthType.PERCENTAGE },
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    rows: [new TableRow({ children: [
      new TableCell({
        children: [new Paragraph({ children: [new TextRun({ text: 'PERIPHERAL LEVEL\n(Nociceptor threshold)\nNSAIDs, ice, compression, US', bold: true, size: 19, color: C.red, font: 'Calibri' })], alignment: AlignmentType.CENTER, spacing: { before: 80, after: 80 } })],
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      }),
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        children: [new Paragraph({ children: [new TextRun({ text: 'SPINAL LEVEL\n(Gate Control)\nTENS, vibration, massage', bold: true, size: 19, color: C.purple, font: 'Calibri' })], alignment: AlignmentType.CENTER, spacing: { before: 80, after: 80 } })],
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      }),
      new TableCell({
        children: [new Paragraph({ children: [new TextRun({ text: 'SUPRASPINAL LEVEL\n(Descending inhibition)\nAcupuncture, low-freq TENS', bold: true, size: 19, color: C.blue, font: 'Calibri' })], alignment: AlignmentType.CENTER, spacing: { before: 80, after: 80 } })],
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        margins: { top: 80, bottom: 80, left: 80, right: 80 },
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      }),
      new TableCell({
        children: [new Paragraph({ children: [new TextRun({ text: 'CORTICAL LEVEL\n(Cognitive modulation)\nCBT, education, relaxation', bold: true, size: 19, color: C.green, font: 'Calibri' })], alignment: AlignmentType.CENTER, spacing: { before: 80, after: 80 } })],
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      }),
    ]})]
  }),
  arrow(),
  flowBox('PAIN PERCEPTION AT CORTEX\n(Somatosensory + Limbic + Prefrontal)', C.yellow, C.amber),
  arrow(),
  flowBox('MODULATION REDUCES/MODIFIES PAIN EXPERIENCE', C.lgreen, C.green, true),
  new Paragraph({ spacing: { before: 100 } }),
  divider(),
];

// ── SECTION 12: High-Yield Key Points ────────────────────────────────────────
const sec12 = [
  heading1('12. High-Yield Exam Key Points'),
  new Table({
    width: { size: 100, type: WidthType.PERCENTAGE },
    rows: [
      headerRow(['#', 'Key Fact to Remember']),
      altRow(['1', 'First pain = A-delta (sharp, fast) | Second pain = C fibers (dull, slow, burning)'], 0),
      altRow(['2', 'Gate is in substantia gelatinosa (Lamina II) of dorsal horn – Melzack & Wall 1965'], 1),
      altRow(['3', 'Large fibers (A-beta) CLOSE the gate; Small fibers (A-delta, C) OPEN the gate'], 0),
      altRow(['4', 'PAG + NRM = the descending pain suppressive system'], 1),
      altRow(['5', 'Three descending transmitters: Serotonin, Norepinephrine, Opioids (SNO)'], 0),
      altRow(['6', 'Endogenous opioids: β-endorphin (hypothalamus), enkephalins (dorsal horn), dynorphins'], 1),
      altRow(['7', 'Referred pain: viscero-somatic convergence at dorsal horn → brain misinterprets origin'], 0),
      altRow(['8', 'Phantom pain = neuropathic (cortical map reorganization + central sensitization)'], 1),
      altRow(['9', 'WDR neurons: key in sensitization, wind-up, and chronic pain'], 0),
      altRow(['10', 'GABA + Glycine = inhibitory interneuron transmitters mediating gate closure'], 1),
      altRow(['11', 'Exercise-induced analgesia = β-endorphin release from hypothalamus/pituitary'], 0),
      altRow(['12', 'Peripheral sensitization = receptor level | Central sensitization = spinal/brain level'], 1),
      altRow(['13', 'Allodynia = pain from non-painful stimulus | Hyperalgesia = exaggerated pain from painful stimulus'], 0),
      altRow(['14', 'Tricyclics/SNRIs reduce chronic pain by enhancing descending serotonin + NE inhibition'], 1),
      altRow(['15', 'Placebo analgesia is REAL – mediated by opioids, reversed by naloxone'], 0),
    ]
  }),
  new Paragraph({ spacing: { before: 100 } }),
  divider(),
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// ── SECTION 13: Answer Writing Guide ─────────────────────────────────────────
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  heading1('13. 20-Mark Answer Writing Structure'),
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    width: { size: 100, type: WidthType.PERCENTAGE },
    rows: [
      headerRow(['Section', 'Content', 'Marks Approx.']),
      altRow(['Introduction', 'IASP definition + multidimensional concept (5–7 lines)', '1–2'], 0),
      altRow(['Three Dimensions', 'Sensory-discriminative, Motivational-affective, Cognitive-evaluative (table)', '2'], 1),
      altRow(['Pain Fibers', 'A-delta, C, A-beta – table with clinical relevance', '2'], 0),
      altRow(['Transmission Pathway', 'Draw the flow diagram from nociceptor to cortex', '2–3'], 1),
      altRow(['Peripheral Sensitization', 'Mediators + mechanism + hyperalgesia/allodynia', '2'], 0),
      altRow(['Clinical Types', 'Acute vs chronic table + referred + phantom pain', '2'], 1),
      altRow(['Gate Control Theory', 'Diagram + mechanism (substantia gelatinosa) – draw!', '3–4'], 0),
      altRow(['Descending Inhibitory Pathways', 'PAG → NRM diagram + 3 neurotransmitters + endorphins', '3'], 1),
      altRow(['Cortical Modulation', 'Psychological influence with PET imaging evidence', '1'], 0),
      altRow(['Physiotherapy Applications', 'Table by 4 levels', '1–2'], 1),
      altRow(['Conclusion', '3–4 lines tying it together', '1'], 0),
    ]
  }),
  new Paragraph({ spacing: { before: 100 } }),
  note('DIAGRAMS EARN EXTRA MARKS – Practice the Gate Control diagram and Descending Pathway diagram before the exam!'),
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  new Table({
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        para('Pain is a multidimensional protective experience mediated by peripheral nociceptors, spinal transmission, ascending tracts, and brain processing. Modulation occurs through gate control at the spinal level, descending inhibitory pathways via PAG and NRM with opioid/serotonin/noradrenergic mechanisms, and cortical cognitive-behavioral influences. A clear understanding of these mechanisms is essential for rational physiotherapy and pain management.'),
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