Explain me 10 common heart disease
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I now have solid textbook content for all 10 conditions. Let me compile a comprehensive answer.
10 Common Heart Diseases
1. Coronary Artery Disease (CAD)
Definition: Narrowing or blockage of the coronary arteries, most commonly due to atherosclerosis — the buildup of lipid-rich plaques within the vessel walls.
Pathophysiology: Atherosclerotic plaques reduce myocardial blood supply. When a plaque ruptures, it triggers platelet aggregation and thrombus formation, potentially causing complete occlusion.
Symptoms:
- Stable angina (chest pain with exertion, relieved by rest)
- Unstable angina (pain at rest or with minimal exertion)
- Shortness of breath, fatigue
Risk Factors: Hypertension, dyslipidemia, diabetes, smoking, obesity, family history
Treatment: Lifestyle modification, statins, aspirin, beta-blockers, nitrates, PCI (angioplasty/stenting), or coronary artery bypass grafting (CABG)
2. Myocardial Infarction (Heart Attack)
Definition: Necrosis of heart muscle resulting from ischemia, defined as "acute myocardial injury detected by abnormal cardiac biomarkers in the setting of evidence of acute myocardial ischemia."
Pathogenesis: In the typical sequence:
- An atherosclerotic plaque is disrupted, exposing subendothelial collagen
- Platelets adhere and release thromboxane A₂, ADP, and serotonin → further aggregation and vasospasm
- Coagulation is activated via tissue factor
- A thrombus fully occludes the coronary lumen within minutes
Approximately 10% of MIs occur before age 40; ~45% before age 65. Women are relatively protected during reproductive years but lose this protection after menopause. (Robbins & Kumar Basic Pathology)
Symptoms: Sudden crushing chest pain (often radiating to the left arm/jaw), diaphoresis, nausea, dyspnea
Treatment: Emergency reperfusion — thrombolytics or percutaneous coronary intervention (PCI); antiplatelet therapy (aspirin + P2Y12 inhibitor), anticoagulation, beta-blockers, ACE inhibitors
3. Heart Failure (HF)
Definition: A clinical syndrome resulting from the inability of the heart to meet the metabolic requirements of the body at normal filling pressures.
Types:
- HFrEF (Heart Failure with Reduced Ejection Fraction): EF < 45–50%, impaired LV contraction
- HFpEF (Heart Failure with Preserved EF): EF > 45–50%, impaired LV relaxation/filling — nearly as common as HFrEF
Pathophysiology: Triggered by injuries such as CAD, MI, hypertension, valvular disease, or diabetes → LV remodeling (stretching and dilation) → neurohormonal activation (RAAS, SNS, endothelin-1) → progressive cardiac dysfunction. Mortality remains ~50% within 5 years of diagnosis. (Textbook of Family Medicine 9e)
Symptoms: Dyspnea, reduced exercise tolerance, peripheral edema, orthopnea, paroxysmal nocturnal dyspnea
Treatment: ACE inhibitors/ARBs/ARNI (sacubitril-valsartan), beta-blockers (carvedilol, bisoprolol, metoprolol), aldosterone antagonists (spironolactone), diuretics, SGLT2 inhibitors; cardiac resynchronization therapy for advanced cases
4. Hypertensive Heart Disease
Definition: Cardiac complications arising from sustained arterial hypertension, manifesting primarily as left ventricular hypertrophy (LVH).
Diagnosis criteria:
- LV hypertrophy in the absence of other cardiovascular pathology
- History or pathologic evidence of hypertension in other organs
Morphology: Heart weight can exceed 500 g (normal ~320–360 g); LV wall thickness > 2.0 cm (normal 1.2–1.4 cm). Microscopically: increased myocyte transverse diameter, "boxcar nuclei," and intercellular fibrosis.
Clinical course: Often asymptomatic initially — discovered by elevated BP on routine exam or ECG/echo findings. LVH leads to diastolic stiffness → left atrial dilation → atrial fibrillation. Long-standing disease can culminate in CHF, ventricular arrhythmias, sudden cardiac death, and increased MI severity. (Robbins & Kumar Basic Pathology)
Treatment: Antihypertensive therapy (target BP < 130/80 mmHg); effective control can regress LVH
5. Atrial Fibrillation (AF)
Definition: An irregular, disorganized atrial rhythm characterized by chaotic electrical activity, abolishing effective atrial contraction and producing an irregularly irregular ventricular response.
Pathophysiology: Multiple re-entrant wavelets within the atria prevent coordinated contraction. Blood stagnates in the left atrial appendage → thrombus formation → embolic stroke (the most feared complication).
Symptoms: Palpitations, fatigue, dyspnea, dizziness; some patients are asymptomatic
Classification: Paroxysmal, persistent, long-standing persistent, permanent
Treatment:
- Rate control: beta-blockers, calcium channel blockers (diltiazem, verapamil), digoxin
- Rhythm control: antiarrhythmic drugs (flecainide, amiodarone), cardioversion, catheter ablation
- Stroke prevention: anticoagulation (warfarin or direct oral anticoagulants — DOACs) guided by CHA₂DS₂-VASc score
6. Valvular Heart Disease
Definition: Structural or functional abnormality of one or more cardiac valves, causing stenosis (obstruction) or regurgitation (backflow), or both.
Major types:
| Valve Lesion | Key Features |
|---|---|
| Aortic stenosis | Most common valvular disease; causes LVH → angina, syncope, heart failure (AVA < 1 cm²) |
| Aortic regurgitation | Volume overload → LV dilation; acute (emergency) vs. chronic forms |
| Mitral stenosis | Usually rheumatic; causes left atrial enlargement → AF, pulmonary hypertension |
| Mitral regurgitation | Volume overload; causes LV and LA dilation; can be primary (MVP) or secondary (ischemic) |
| Mitral valve prolapse | Common (up to 2.5% of general population); usually benign; rarely causes severe MR |
(Textbook of Family Medicine 9e; Braunwald's Heart Disease)
Treatment: Medical management for symptoms; surgical valve repair or replacement, or transcatheter procedures (TAVR for aortic stenosis) for severe cases
7. Cardiomyopathy
Definition: A group of diseases directly affecting the myocardium, classified by structural and functional phenotype.
Main types:
- Dilated cardiomyopathy (DCM): LV dilation with systolic dysfunction; causes include alcohol, viral myocarditis, genetics, chemotherapy
- Hypertrophic cardiomyopathy (HCM): Asymmetric LV hypertrophy, often with dynamic outflow obstruction (HOCM); genetic in most cases (sarcomere mutations); leading cause of sudden cardiac death in young athletes
- Restrictive cardiomyopathy: Stiff, non-compliant ventricles with preserved systolic function; causes include amyloidosis, sarcoidosis, hemochromatosis
- Arrhythmogenic cardiomyopathy (ARVC): Fibrofatty replacement of RV myocardium; associated with sudden death in young people
Symptoms: Dyspnea, palpitations, syncope (especially HCM), heart failure, sudden cardiac death
Treatment: Varies by type — beta-blockers, disopyramide, septal reduction therapy (HCM); ICD for sudden death prevention; heart transplant for end-stage DCM
8. Infective Endocarditis (IE)
Definition: Microbial infection of the endocardial surface of the heart, most often affecting the cardiac valves (native or prosthetic).
Incidence: Increasing due to IV drug abuse and the growing use of prosthetic heart valves and intravascular devices.
Causative organisms: Staphylococcus aureus (acute, aggressive), Streptococcus viridans (subacute), Enterococcus, HACEK organisms
Pathophysiology: Bacteria colonize damaged endothelium or valve surfaces → formation of "vegetations" (fibrin-platelet-bacteria masses) → systemic embolization (especially to brain, kidneys, spleen)
Neurological complications occur in 25–35% of cases, including embolic stroke, mycotic aneurysms, brain abscess, and meningitis — particularly with mitral valve involvement. (Bradley and Daroff's Neurology in Clinical Practice)
Diagnosis: Duke criteria (blood cultures + echocardiography)
Treatment: Prolonged IV antibiotics (4–6 weeks); surgical valve replacement for complications (severe regurgitation, abscess, persistent infection)
9. Congenital Heart Disease (CHD)
Definition: Structural or functional cardiac defects present from birth, arising from abnormal fetal cardiac development.
Common lesions:
| Defect | Type | Key Feature |
|---|---|---|
| VSD (Ventricular Septal Defect) | L→R shunt | Most common CHD; may close spontaneously |
| ASD (Atrial Septal Defect) | L→R shunt | May present with AF or stroke in adulthood |
| PDA (Patent Ductus Arteriosus) | L→R shunt | Common in premature infants |
| Tetralogy of Fallot | Cyanotic | 4 defects: VSD, RV hypertrophy, pulmonary stenosis, overriding aorta |
| Coarctation of the Aorta | Obstructive | Causes upper-body hypertension; presents with rib notching on CXR |
| Transposition of Great Arteries | Cyanotic | Emergency in neonates; requires immediate prostaglandin E1 |
Eisenmenger syndrome: Long-standing L→R shunt → severe pulmonary hypertension → shunt reversal (R→L) → cyanosis; a late, irreversible complication. (Murray & Nadel's Textbook of Respiratory Medicine)
Treatment: Device closure (catheter-based) or surgical repair; pulmonary hypertension therapies for Eisenmenger syndrome
10. Pericardial Disease (Pericarditis & Pericardial Effusion)
Definition: Inflammation of the pericardium (pericarditis), with or without fluid accumulation in the pericardial sac (pericardial effusion/tamponade).
Acute pericarditis causes: Viral (most common — coxsackievirus, echovirus), bacterial, post-MI (Dressler syndrome), autoimmune (SLE, RA), uremia, malignancy
Symptoms:
- Sharp, pleuritic chest pain that improves when leaning forward
- Friction rub on auscultation (pathognomonic)
- ECG: diffuse saddle-shaped ST elevation + PR depression
Cardiac tamponade: Rapid fluid accumulation compresses the heart → Beck's triad: hypotension, muffled heart sounds, raised JVP → obstructive shock; treated with emergency pericardiocentesis
Constrictive pericarditis: Chronic fibrous scarring of the pericardium → impaired ventricular filling → mimics restrictive cardiomyopathy
Treatment: NSAIDs + colchicine (acute pericarditis); drainage for tamponade; pericardiectomy for constrictive disease
Summary Table
| # | Disease | Key Mechanism | Cardinal Symptom | Hallmark Finding |
|---|---|---|---|---|
| 1 | Coronary Artery Disease | Atherosclerosis | Angina | ST changes on ECG |
| 2 | Myocardial Infarction | Plaque rupture + thrombosis | Crushing chest pain | Elevated troponin |
| 3 | Heart Failure | LV remodeling | Dyspnea | Reduced EF on echo |
| 4 | Hypertensive Heart Disease | Pressure overload → LVH | Often asymptomatic | LVH on echo/ECG |
| 5 | Atrial Fibrillation | Chaotic atrial electrical activity | Palpitations | Irregularly irregular pulse |
| 6 | Valvular Heart Disease | Stenosis or regurgitation | Dyspnea, murmur | Echo valve abnormality |
| 7 | Cardiomyopathy | Primary myocardial disease | Dyspnea, syncope | Dilated/hypertrophied LV |
| 8 | Infective Endocarditis | Valve vegetation from bacteria | Fever, new murmur | Positive blood cultures |
| 9 | Congenital Heart Disease | Developmental structural defect | Cyanosis or HF | Echocardiogram |
| 10 | Pericarditis/Tamponade | Pericardial inflammation/fluid | Sharp positional chest pain | Friction rub, PR depression |
Sources: Robbins & Kumar Basic Pathology; Textbook of Family Medicine 9e; Braunwald's Heart Disease; Bradley and Daroff's Neurology in Clinical Practice; Murray & Nadel's Textbook of Respiratory Medicine
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