Lecture Class for MBBS Students Topic: Ischemic Heart Disease (IHD)
1 Hour Lecture Class for MBBS Students
Topic: Ischemic Heart Disease (IHD)
Subtopics:
Angina Pectoris
Myocardial Infarction (MI)
Sudden Cardiac Death (SCD)
1. OBJECTIVE (05 Minutes)
At the end of the class, students will be able to:
Define ischemic heart disease and explain its epidemiology.
Describe the pathophysiology and risk factors of IHD.
Differentiate between stable angina, unstable angina, and myocardial infarction.
Explain the clinical features, diagnosis, complications, and management of myocardial infarction.
Discuss causes and prevention of sudden cardiac death.
Interpret basic ECG changes in ischemic heart disease.
2. PURPOSE OF LEARNING (03 Minutes)
This lecture helps MBBS students understand one of the leading causes of morbidity and mortality worldwide. Knowledge of ischemic heart disease is essential for early diagnosis, emergency management, prevention of complications, and reduction of cardiovascular mortality.
3. PREREQUISITE (02 Minutes)
Students should have prior knowledge of:
Anatomy of the heart and coronary circulation
Physiology of cardiac muscle and blood supply
Basics of ECG interpretation
Cardiac risk factors such as hypertension, diabetes, smoking, and dyslipidemia
4. CONTENTS (40 Minutes)
A. Introduction to Ischemic Heart Disease (05 Minutes)
Definition
Ischemic heart disease is a condition caused by an imbalance between myocardial oxygen supply and demand, usually due to reduced coronary blood flow.
Major Forms of IHD
Angina pectoris
Myocardial infarction
Chronic ischemic heart disease
Sudden cardiac death
Epidemiology
Leading cause of death worldwide
More common in males and elderly patients
Increasing prevalence due to diabetes and sedentary lifestyle
B. Etiology and Risk Factors (05 Minutes)
Non-Modifiable Risk Factors
Age
Male sex
Family history of coronary artery disease
Modifiable Risk Factors
Smoking
Hypertension
Diabetes mellitus
Hyperlipidemia
Obesity
Sedentary lifestyle
Stress
Pathogenesis
Most cases occur due to atherosclerosis of coronary arteries leading to narrowing and thrombosis.
C. Angina Pectoris (10 Minutes)
Definition
Chest pain caused by transient myocardial ischemia without myocardial necrosis.
Types of Angina
1. Stable Angina
Predictable chest pain on exertion
Relieved by rest or nitrates
2. Unstable Angina
Pain occurs at rest or with minimal exertion
Increasing severity and frequency
Medical emergency
3. Variant (Prinzmetal) Angina
Due to coronary vasospasm
Usually occurs at rest
Clinical Features
Retrosternal chest discomfort
Radiation to left arm, neck, jaw, or back
Sweating and breathlessness may occur
Diagnosis
History and examination
ECG
Exercise stress test
Echocardiography
Coronary angiography
Management
Lifestyle Modification
Smoking cessation
Weight control
Exercise
Diet control
Drugs
Nitrates
Beta blockers
Calcium channel blockers
Antiplatelet agents
Statins
D. Myocardial Infarction (15 Minutes)
Definition
Death (necrosis) of myocardial tissue due to prolonged ischemia.
Causes
Acute coronary thrombosis following rupture of atherosclerotic plaque
Types
STEMI
ST elevation myocardial infarction
NSTEMI
Non-ST elevation myocardial infarction
Pathophysiology
\text{Myocardial Oxygen Supply} < \text{Myocardial Oxygen Demand}
Coronary artery occlusion causes prolonged ischemia leading to irreversible myocardial cell death.
Clinical Features
Severe crushing chest pain lasting >20 minutes
Pain radiates to left shoulder or jaw
Sweating
Nausea and vomiting
Dyspnea
Anxiety
ECG Changes
STEMI
ST elevation
Pathological Q waves
T wave inversion
NSTEMI
ST depression
T wave inversion
Cardiac Biomarkers
Troponin I/T
CK-MB
Complications
Arrhythmias
Heart failure
Cardiogenic shock
Ventricular rupture
Pericarditis
Management
Immediate Management
“MONA”
Morphine
Oxygen
Nitrates
Aspirin
Reperfusion Therapy
Primary PCI
Thrombolysis
Long-Term Treatment
Antiplatelet therapy
Statins
ACE inhibitors
Beta blockers
Cardiac rehabilitation
E. Sudden Cardiac Death (05 Minutes)
Definition
Unexpected cardiac death occurring within 1 hour of symptom onset.
Common Causes
Ventricular fibrillation
Ventricular tachycardia
Acute myocardial infarction
Risk Factors
Previous MI
Severe LV dysfunction
Heart failure
Arrhythmias
Prevention
Control of coronary risk factors
Early treatment of MI
Implantable cardioverter defibrillator (ICD) in high-risk patients
5. METHODS (Throughout the Class)
Interactive lecture
PowerPoint presentation
ECG demonstration
Case-based discussion
Question-answer session
6. TEACHING MATERIALS
Multimedia projector
Whiteboard and markers
ECG charts
Coronary artery diagrams
Echocardiography images
Handouts
7. ASSESSMENT (REVIEW & FEEDBACK) (03 Minutes)
Short Questions
Define ischemic heart disease.
Differentiate stable and unstable angina.
Name two cardiac biomarkers used in MI.
Mention complications of myocardial infarction.
What is sudden cardiac death?
ECG Identification
Identify ST elevation in STEMI ECG
8. SUMMARIZATION (01 Minute)
Ischemic heart disease is mainly caused by coronary atherosclerosis.
Angina results from transient ischemia.
Myocardial infarction causes myocardial necrosis and requires urgent treatment.
Sudden cardiac death commonly results from fatal arrhythmias.
Early diagnosis and prevention significantly reduce mortality.
9. REFERENCES
Davidson’s Principles and Practice of Medicine
Harrison’s Principles of Internal Medicine
American Heart Association Guidelines
European Society of Cardiology Guidelines
10. CONCLUSION
Ischemic heart disease remains a major global health problem. Understanding angina, myocardial infarction, and sudden cardiac death is crucial for MBBS students because prompt recognition and management can save lives and reduce complications.
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