Essential Cardiology Topics – Concise
Academic Notes for Medical Students
Table of Contents
1. Heart Failure – Etiology, Classification, Pathophysiology, Clinical Features- page. 2
2. Acute Left-Sided Heart Failure- page. 4
3. Acute Circulatory Failure (Shock)-page. 7
4. Chronic Congestive Heart Failure (CHF)-page. 11
5. Chronic Cor Pulmonale-page. 14
6. Rheumatic Fever-page. 17
7. Aortic Regurgitation (Aortic Insufficiency)-page. 20
8. Aortic Stenosis-page. 23
9. Mitral Regurgitation (Mitral Insufficiency)-page. 26
10. Mitral Stenosis-page. 29
11. Essential Hypertension-page. 32
12. Hypertensive Disease: Treatment-page. 34
13. Hypertensive crisis-page. 37
14. Symptomatic (Secondary) Hypertension-page. 39
15. Ischemic Heart Disease (IHD) – Classification, Etiology, Pathogenesis. Differential
Diagnosis of Chest Pain-page. 42
16. Ischemic Heart Disease. Acute Coronary Syndrome without ST-Segment Elevation
(NSTE-ACS)-page. 45
17. Acute Coronary Syndrome with ST-Segment Elevation (STEMI)-page. 47
18. Algorithm for Non–ST-Segment Elevation Acute Coronary Syndromes (NSTE-ACS)-p. 49
19. Algorithm for ST-Segment Elevation Acute Coronary Syndrome (STEMI)-page. 51
20. Treatment of Acute Myocardial Infarction (AMI) with Complications-page. 53
21. Myocarditis-page. 56
22. Cardiomyopathies-page. 59
23. Infective Endocarditis-page. 62
24. Pericarditis and Diseases of the Pericardium-page. 65
25. Congenital Heart Defects-page. 68
Pharmacological Treatment-page73
1. Cardioinotropic Drugs – Cardiac Glycosides and Sympathomimetics-page.73
2. Antithrombotic Pharmacotherapy-page. 75
3. Antiarrhythmic Drugs-page. 79
4. Beta-Blockers-page. 82
5. Vasodilators-page. 84
6. Diuretics-page. 86
7. Antilipidemic Drugs-page. 89
8. Inhibitors of the Renin–Angiotensin–Aldosterone System (RAAS)-page. 92
,Heart Failure – Etiology, Classification,
Pathophysiology, Clinical Features
1.Definition
Heart failure represents the final stage of most chronic cardiovascular diseases, including
ischemic heart disease, arterial hypertension, and valvular disorders. It arises from structural or
functional abnormalities of the myocardium, resulting in impaired cardiac output and/or
elevated intracardiac filling pressures. Consequently, the forward stroke volume becomes
insufficient to meet the metabolic requirements of peripheral tissues.
2.Etiology
• Heart failure with reduced ejection fraction (HFrEF): most commonly due to
ischemic heart disease, arterial hypertension, toxic cardiomyopathy, infiltrative or
autoimmune conditions.
• High-output heart failure: secondary to states such as thyrotoxicosis, severe obesity,
anemia, and chronic pulmonary disease.
• Precipitating factors: non-compliance with therapy, recurrent myocardial infarction,
dietary indiscretion, infections, emotional or physical stress, pulmonary embolism,
arrhythmias, and conduction abnormalities.
3.Pathophysiology
Heart failure is a chronic progressive syndrome driven by maladaptive cardiac remodeling.
Initially, compensatory mechanisms maintain cardiac output, but over time they exacerbate
myocardial dysfunction.
• Ventricular remodeling: characterized by myocyte hypertrophy and interstitial
fibrosis.
o Concentric hypertrophy develops in response to increased afterload.
o Eccentric hypertrophy occurs with chronic volume overload (preload).
• Neurohormonal activation: renin–angiotensin–aldosterone system (RAAS) and
sympathetic nervous system contribute to vasoconstriction, fluid retention, increased
myocardial oxygen demand, arrhythmogenesis, and progressive fibrosis.
• Other mediators: endothelin, pro-inflammatory cytokines, and oxidative stress further
impair cardiac function.
4.Classification
• By onset: acute vs. chronic.
, • By anatomic involvement: left-sided, right-sided, or biventricular (global).
• By hemodynamic profile: low-output vs. congestive.
• Functional capacity (NYHA):
o Class I – no limitation of physical activity.
o Class II – mild symptoms with ordinary activity.
o Class III – marked limitation, symptoms with less than ordinary activity.
o Class IV – symptoms present at rest.
• Severity after myocardial infarction (Killip classification):
o Class I – no evidence of heart failure.
o Class II – S3 gallop, basal pulmonary rales.
o Class III – pulmonary edema with diffuse rales.
o Class IV – cardiogenic shock.
5.Clinical Features
• Left-sided failure: fatigue, exertional dyspnea, cardiomegaly, S3/S4 gallop, renal
impairment.
• Pulmonary manifestations: orthopnea, paroxysmal nocturnal dyspnea, pulmonary
congestion with rales, cough, and frothy sputum.
• Right-sided failure: peripheral edema, hepatomegaly, jugular venous distension,
ascites, varicocele.
6.Diagnosis
• Echocardiography: gold standard for assessment of chamber size, ejection fraction,
and valvular disease.
• Chest X-ray: cardiothoracic ratio >0.5, evidence of pulmonary congestion or edema.
• Electrocardiogram (ECG): left ventricular hypertrophy, arrhythmias, conduction
blocks.
• Biomarkers: elevated B-type natriuretic peptide (BNP) indicating ventricular stress and
remodeling.
, Acute Left-Sided Heart Failure
1.Definition
Acute left-sided heart failure (LHF) is a rapidly developing syndrome of systolic and/or
diastolic dysfunction of the left ventricle, leading to acute cardiogenic respiratory failure.
2.Etiology
• Ischemic causes: acute myocardial infarction, ischemic heart disease.
• Inflammatory/structural: myocarditis, cardiomyopathies.
• Pressure overload: hypertensive crisis.
• Rhythm and conduction disturbances: atrial fibrillation with rapid ventricular
response, advanced AV block, tachyarrhythmias or bradyarrhythmias.
• Valvular pathology: acute aortic stenosis, acute aortic regurgitation, aortic dissection.
• Decompensated chronic heart failure.
3.Clinical Forms:
A. Cardiac asthma – increased left ventricular end-diastolic pressure → left atrial
hypertension → elevated pulmonary capillary pressure → transudation into the
interstitium.
o Fine inspiratory crackles with accentuated vesicular breathing.
o Paroxysmal nocturnal dyspnea, awakening with severe inspiratory difficulty.
o Pink, frothy sputum.
o Symptoms improve slowly after assuming upright position (>30 minutes).
B. Pulmonary edema – severe form of cardiogenic respiratory failure, with alveolar
flooding.
o Severe dyspnea, tachypnea, orthopnea, cough with frothy pink sputum.
o Inspiratory crackles diffusely present across both lung fields.
o Hypoxemia with initial hypocapnia, progressing to hypercapnia.
o Right-to-left intrapulmonary shunting.
o Auscultation: gallop rhythm, systolic murmur of mitral regurgitation.
o Alternating (pulsus alternans).
o Inspiratory retractions of intercostal muscles.
Academic Notes for Medical Students
Table of Contents
1. Heart Failure – Etiology, Classification, Pathophysiology, Clinical Features- page. 2
2. Acute Left-Sided Heart Failure- page. 4
3. Acute Circulatory Failure (Shock)-page. 7
4. Chronic Congestive Heart Failure (CHF)-page. 11
5. Chronic Cor Pulmonale-page. 14
6. Rheumatic Fever-page. 17
7. Aortic Regurgitation (Aortic Insufficiency)-page. 20
8. Aortic Stenosis-page. 23
9. Mitral Regurgitation (Mitral Insufficiency)-page. 26
10. Mitral Stenosis-page. 29
11. Essential Hypertension-page. 32
12. Hypertensive Disease: Treatment-page. 34
13. Hypertensive crisis-page. 37
14. Symptomatic (Secondary) Hypertension-page. 39
15. Ischemic Heart Disease (IHD) – Classification, Etiology, Pathogenesis. Differential
Diagnosis of Chest Pain-page. 42
16. Ischemic Heart Disease. Acute Coronary Syndrome without ST-Segment Elevation
(NSTE-ACS)-page. 45
17. Acute Coronary Syndrome with ST-Segment Elevation (STEMI)-page. 47
18. Algorithm for Non–ST-Segment Elevation Acute Coronary Syndromes (NSTE-ACS)-p. 49
19. Algorithm for ST-Segment Elevation Acute Coronary Syndrome (STEMI)-page. 51
20. Treatment of Acute Myocardial Infarction (AMI) with Complications-page. 53
21. Myocarditis-page. 56
22. Cardiomyopathies-page. 59
23. Infective Endocarditis-page. 62
24. Pericarditis and Diseases of the Pericardium-page. 65
25. Congenital Heart Defects-page. 68
Pharmacological Treatment-page73
1. Cardioinotropic Drugs – Cardiac Glycosides and Sympathomimetics-page.73
2. Antithrombotic Pharmacotherapy-page. 75
3. Antiarrhythmic Drugs-page. 79
4. Beta-Blockers-page. 82
5. Vasodilators-page. 84
6. Diuretics-page. 86
7. Antilipidemic Drugs-page. 89
8. Inhibitors of the Renin–Angiotensin–Aldosterone System (RAAS)-page. 92
,Heart Failure – Etiology, Classification,
Pathophysiology, Clinical Features
1.Definition
Heart failure represents the final stage of most chronic cardiovascular diseases, including
ischemic heart disease, arterial hypertension, and valvular disorders. It arises from structural or
functional abnormalities of the myocardium, resulting in impaired cardiac output and/or
elevated intracardiac filling pressures. Consequently, the forward stroke volume becomes
insufficient to meet the metabolic requirements of peripheral tissues.
2.Etiology
• Heart failure with reduced ejection fraction (HFrEF): most commonly due to
ischemic heart disease, arterial hypertension, toxic cardiomyopathy, infiltrative or
autoimmune conditions.
• High-output heart failure: secondary to states such as thyrotoxicosis, severe obesity,
anemia, and chronic pulmonary disease.
• Precipitating factors: non-compliance with therapy, recurrent myocardial infarction,
dietary indiscretion, infections, emotional or physical stress, pulmonary embolism,
arrhythmias, and conduction abnormalities.
3.Pathophysiology
Heart failure is a chronic progressive syndrome driven by maladaptive cardiac remodeling.
Initially, compensatory mechanisms maintain cardiac output, but over time they exacerbate
myocardial dysfunction.
• Ventricular remodeling: characterized by myocyte hypertrophy and interstitial
fibrosis.
o Concentric hypertrophy develops in response to increased afterload.
o Eccentric hypertrophy occurs with chronic volume overload (preload).
• Neurohormonal activation: renin–angiotensin–aldosterone system (RAAS) and
sympathetic nervous system contribute to vasoconstriction, fluid retention, increased
myocardial oxygen demand, arrhythmogenesis, and progressive fibrosis.
• Other mediators: endothelin, pro-inflammatory cytokines, and oxidative stress further
impair cardiac function.
4.Classification
• By onset: acute vs. chronic.
, • By anatomic involvement: left-sided, right-sided, or biventricular (global).
• By hemodynamic profile: low-output vs. congestive.
• Functional capacity (NYHA):
o Class I – no limitation of physical activity.
o Class II – mild symptoms with ordinary activity.
o Class III – marked limitation, symptoms with less than ordinary activity.
o Class IV – symptoms present at rest.
• Severity after myocardial infarction (Killip classification):
o Class I – no evidence of heart failure.
o Class II – S3 gallop, basal pulmonary rales.
o Class III – pulmonary edema with diffuse rales.
o Class IV – cardiogenic shock.
5.Clinical Features
• Left-sided failure: fatigue, exertional dyspnea, cardiomegaly, S3/S4 gallop, renal
impairment.
• Pulmonary manifestations: orthopnea, paroxysmal nocturnal dyspnea, pulmonary
congestion with rales, cough, and frothy sputum.
• Right-sided failure: peripheral edema, hepatomegaly, jugular venous distension,
ascites, varicocele.
6.Diagnosis
• Echocardiography: gold standard for assessment of chamber size, ejection fraction,
and valvular disease.
• Chest X-ray: cardiothoracic ratio >0.5, evidence of pulmonary congestion or edema.
• Electrocardiogram (ECG): left ventricular hypertrophy, arrhythmias, conduction
blocks.
• Biomarkers: elevated B-type natriuretic peptide (BNP) indicating ventricular stress and
remodeling.
, Acute Left-Sided Heart Failure
1.Definition
Acute left-sided heart failure (LHF) is a rapidly developing syndrome of systolic and/or
diastolic dysfunction of the left ventricle, leading to acute cardiogenic respiratory failure.
2.Etiology
• Ischemic causes: acute myocardial infarction, ischemic heart disease.
• Inflammatory/structural: myocarditis, cardiomyopathies.
• Pressure overload: hypertensive crisis.
• Rhythm and conduction disturbances: atrial fibrillation with rapid ventricular
response, advanced AV block, tachyarrhythmias or bradyarrhythmias.
• Valvular pathology: acute aortic stenosis, acute aortic regurgitation, aortic dissection.
• Decompensated chronic heart failure.
3.Clinical Forms:
A. Cardiac asthma – increased left ventricular end-diastolic pressure → left atrial
hypertension → elevated pulmonary capillary pressure → transudation into the
interstitium.
o Fine inspiratory crackles with accentuated vesicular breathing.
o Paroxysmal nocturnal dyspnea, awakening with severe inspiratory difficulty.
o Pink, frothy sputum.
o Symptoms improve slowly after assuming upright position (>30 minutes).
B. Pulmonary edema – severe form of cardiogenic respiratory failure, with alveolar
flooding.
o Severe dyspnea, tachypnea, orthopnea, cough with frothy pink sputum.
o Inspiratory crackles diffusely present across both lung fields.
o Hypoxemia with initial hypocapnia, progressing to hypercapnia.
o Right-to-left intrapulmonary shunting.
o Auscultation: gallop rhythm, systolic murmur of mitral regurgitation.
o Alternating (pulsus alternans).
o Inspiratory retractions of intercostal muscles.
