Rheumatic & Valvular Heart Disease

Mitral stenosis is the most common long-term cardiac complication of rheumatic fever. Davidson describes that rheumatic fever causes inflammation and scarring of the heart valves, particularly the mitral valve, leading to progressive narrowing. Harrison adds that untreated or recurrent rheumatic fever increases the risk of chronic rheumatic heart disease, often manifesting years after the initial infection.

Reference: Davidson 23rd; P-518
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Stem Breakdown:

Fever, weight loss, and a new systolic murmur: These symptoms are concerning for a systemic infection affecting the heart valves, raising suspicion for infective endocarditis. Murmurs are common in endocarditis due to the vegetation forming on heart valves.
Blood cultures grow gramme-positive cocci. This is typical for organisms like Streptococcus viridans and Staphylococcus aureus, both of which commonly cause infective endocarditis.
Option Analysis:

A) Infective endocarditis: This is the correct diagnosis. Endocarditis is characterised by infection of the heart valves or endocardium, often due to gramme-positive organisms. Davidson and Harrison explain that fever, new murmurs, and positive blood cultures are hallmarks of the disease. Risk factors include valve disease, intravenous drug use, or recent dental procedures.
B) Rheumatic heart disease: While this condition can cause valvular damage, it usually arises as a sequela of untreated streptococcal pharyngitis and does not typically present with acute infection or gramme-positive bacteremia. Rheumatic disease causes chronic changes in valve function, not an acute systemic infection.
C) Pericarditis: Pericarditis often presents with sharp chest pain that improves when sitting up and has different auscultatory findings (pericardial friction rub) compared to a systolic murmur. Blood cultures in pericarditis are typically sterile unless there is a coexisting infection.
D) Myocarditis: Myocarditis primarily involves inflammation of the heart muscle, often due to viral infections. It may cause heart failure symptoms or arrhythmias but typically does not cause systolic murmurs or gramme-positive bacteremia.

Explanation: Aschoff nodules is pathognomonic for rheumatic fever and occur only in the heart

Reference: Davidson 23rd; P-515

Reference: Davidson 23rd; P-524

Explanation: Loud first heart sound, opening snap Mid-diastolic murmur. These are the Auscultation finding of MS

Explanation

Stem Breakdown:

Exertional dyspnoea, chest pain, and syncope: These are classic symptoms of aortic stenosis, indicating reduced cardiac output due to a narrowed aortic valve.
Harsh systolic murmur at the right upper sternal border, radiating to the carotids: This is the hallmark murmur of aortic stenosis, which is best heard at the aortic valve area and radiates to the carotids.
Option Analysis:

A) Aortic stenosis: This is the correct diagnosis. Davidson and Harrison explain that aortic stenosis is a common ventricular heart disease, particularly in older adults. It presents with exertional symptoms due to restricted blood flow through the stenotic aortic valve. The characteristic, harsh systolic murmur radiating to the carotids is diagnostic.
B) Mitral regurgitation: Mitral regurgitation causes a holosystolic murmur best heard at the apex and radiating to the axilla. It is associated with symptoms of heart failure but does not present with aortic murmur characteristics.
C) Aortic regurgitation: Aortic regurgitation causes a diastolic murmur best heard at the left sternal border. It is associated with wide pulse pressure and a "water hammer" pulse, but the systolic murmur described here points to aortic stenosis.
D) Hypertrophic cardiomyopathy: Hypertrophic cardiomyopathy causes a systolic murmur, but it is typically best heard at the left sternal border and increases with manoeuvres like Valsalva. It is associated with a thickened interventricular septum, leading to outflow obstruction.

Reference: Davidson 23rd; P-518

Reference: Davidson 23rd; P-530

Explanation: Echocardiography is a pivotal investigation for vulvular heat disease

Explanation: Night sweats is common in TB & infective endocarditis

Explanation: Tricuspid regurgitation produces giant v waves that coincide with ventricular systole. Davidson 23rd, P-443

Reference: Davidson 23rd , Page : 443, Box : 5

Pansystolic murmur heard best at apex and left sternal edge (diaphragm), radiates to axilla

Reference: Davidson 23rd , Page : 516
Explanation : The most common major manifestation of rheumatic fever is arthritis.

Explanation: Blood culture is the pivotal investigation to identify the organism that is the cause of the infection and to guide antibiotic therapy.