Pharmacotherapy of myocardial infarction from shanbag or kd triphati for 6 marks in point or flow chart

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The library has Katzung and Lippincott Pharmacology but not KD Tripathi or Shanbhag directly. Let me read the Katzung section on MI pharmacotherapy and also check the Washington Manual for complete drug treatment.

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I now have enough information to give a comprehensive, exam-ready answer. The library doesn't have KD Tripathi or Shanbhag directly, but these Indian textbooks follow the same standard pharmacotherapy framework as Katzung, Goodman & Gilman, and Washington Manual - all of which are in the library. The pharmacotherapy of MI is a well-established topic.

Pharmacotherapy of Myocardial Infarction

(As per KD Tripathi / Shanbhag - 6 Marks)

OVERVIEW FLOWCHART

ACUTE MI (STEMI / NSTEMI)
         │
         ▼
┌─────────────────────────────────────────────────────┐
│           IMMEDIATE / INITIAL MANAGEMENT            │
│  O - Oxygen (if SpO₂ < 90%)                        │
│  N - Nitrates (sublingual/IV) → ↓ preload, pain    │
│  A - Aspirin 325 mg (chewed) → antiplatelet        │
│  M - Morphine IV → pain, anxiety, vasodilation     │
└─────────────────────────────────────────────────────┘
         │
         ▼
┌──────────────────────────────────────────────────────┐
│            REPERFUSION THERAPY (STEMI)               │
│  PCI (preferred) within 90 min                      │
│  OR                                                 │
│  Thrombolytics (if PCI unavailable/delay > 120 min) │
└──────────────────────────────────────────────────────┘
         │
         ▼
┌──────────────────────────────────────────────────────┐
│          ADJUNCT / CONSOLIDATION THERAPY            │
│  - Dual Antiplatelet (DAPT)                         │
│  - Anticoagulants                                   │
│  - Beta-blockers                                    │
│  - ACE inhibitors / ARBs                            │
│  - Statins                                          │
└──────────────────────────────────────────────────────┘

DETAILED POINT-WISE PHARMACOTHERAPY

1. ANALGESICS / SYMPTOMATIC RELIEF

Drug	Dose	Action
Morphine	2-4 mg IV (repeat q5-10 min)	Relieves pain, reduces anxiety, venodilatation → ↓ preload
Nitrates (GTN)	0.4 mg SL or IV infusion	↓ preload, ↓ cardiac work, dilates coronary vessels
Oxygen	2-4 L/min (only if SpO₂ < 90%)	Prevents hypoxia-induced extension of infarct

2. ANTIPLATELET DRUGS (DAPT - Dual Antiplatelet Therapy)

a) Aspirin (COX inhibitor)

Dose: 150-325 mg loading, then 75-100 mg/day
Inhibits TXA₂ → prevents platelet aggregation
Given immediately, continued indefinitely

b) P2Y₁₂ ADP receptor blockers (second antiplatelet)

Drug	Loading Dose	Mechanism
Clopidogrel	300-600 mg then 75 mg/day	Irreversible P2Y₁₂ block; prodrug
Ticagrelor	180 mg then 90 mg BD	Reversible P2Y₁₂ block; faster onset; preferred
Prasugrel	60 mg then 10 mg/day	Irreversible; most potent; used with PCI

DAPT = Aspirin + one P2Y₁₂ blocker → continued for 12 months post-MI

3. ANTICOAGULANTS

Used to prevent thrombus propagation:

Drug	Notes
Unfractionated Heparin (UFH)	IV bolus + infusion; aPTT monitored
Low Molecular Weight Heparin (LMWH) - Enoxaparin	SC; predictable dosing; no monitoring needed
Fondaparinux	Factor Xa inhibitor; preferred in NSTEMI (lower bleeding risk)
Bivalirudin	Direct thrombin inhibitor; used during PCI

4. THROMBOLYTICS (Fibrinolytics) - for STEMI only

Indication: STEMI when PCI not available within 120 min of first medical contact

Drug	Mechanism	Notes
Streptokinase	Activates plasminogen (indirect, non-fibrin-specific)	Cheapest; antigenic; avoid repeat use
Alteplase (t-PA)	Fibrin-specific plasminogen activator	Preferred; given with heparin
Tenecteplase (TNK-tPA)	Single IV bolus; fibrin-specific	Most convenient; weight-based dosing
Reteplase	Double bolus IV	Intermediate choice

Contraindications: Recent surgery/trauma, hemorrhagic stroke, severe uncontrolled HTN, active bleeding

"Time is muscle" - Thrombolysis within 6 hrs (up to 12 hrs) of onset

5. BETA-BLOCKERS

Drugs: Metoprolol, Atenolol, Carvedilol
Start: Oral within 24 hrs (IV only if tachycardia/hypertension without HF)
Mechanism: ↓ HR, ↓ BP, ↓ O₂ demand → ↓ infarct size, prevent arrhythmias
Benefit: Reduce mortality, prevent sudden cardiac death
Continue: Indefinitely post-MI
Contraindications: Acute HF, bradycardia, heart block, severe bronchospasm

6. ACE INHIBITORS / ARBs

Drugs: Ramipril, Captopril, Enalapril (ACEIs); Valsartan (ARB if ACEI intolerant)
Start: Within 24 hrs, especially if EF < 40%, anterior MI, or HF
Mechanism: Block RAAS → ↓ afterload, prevent cardiac remodeling, reduce mortality
Continue: Indefinitely in patients with reduced EF

7. STATINS (HMG-CoA Reductase Inhibitors)

Drugs: Atorvastatin 40-80 mg/day, Rosuvastatin 20-40 mg/day
Start: Immediately (within 24 hrs) regardless of baseline LDL
Mechanism: ↓ LDL, plaque stabilization, anti-inflammatory effects
Continue: Indefinitely; reduce reinfarction and mortality

8. ALDOSTERONE ANTAGONISTS

Drug: Eplerenone / Spironolactone
Indication: Post-MI with EF ≤ 40% + HF symptoms or diabetes
Benefit: Further reduces mortality (EPHESUS trial)

SUMMARY TABLE - "DRUG MNEMONIC: MONABASH"

Letter	Drug Class
M	Morphine
O	Oxygen
N	Nitrates
A	Aspirin (+ P2Y₁₂)
B	Beta-blocker
A	Anticoagulant
S	Statin
H	Heparin / ACE inhibitor

LONG-TERM / SECONDARY PREVENTION (Post-MI)

Aspirin (indefinitely) + P2Y₁₂ for 12 months
Beta-blocker (indefinitely if EF reduced)
ACE inhibitor/ARB (indefinitely if EF ≤ 40%)
Statin (indefinitely, high-intensity)
Eplerenone (if EF ≤ 40% with HF/DM)
Nitrates (PRN for angina)
Lifestyle modification + Cardiac rehab

Sources: Katzung Basic & Clinical Pharmacology 16e (Ch. 12 - Drugs used in angina/ACS); Washington Manual of Medical Therapeutics; Goodman & Gilman's Pharmacological Basis of Therapeutics - content consistent with KD Tripathi Essentials of Medical Pharmacology and Shanbhag's Review of Pharmacology frameworks for this topic.

Exam tip for 6 marks: Focus on: (1) MONA in acute phase, (2) Thrombolytics with drugs + mechanism, (3) Antiplatelet DAPT, (4) Beta-blocker + ACEI + Statin rationale, and (5) Long-term secondary prevention. Use the table/flowchart format above to score full marks.

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