Cardiovascular System

Reference: Davidson 23rd; P-509

Reference: Davidson 23rd; P-500
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Reference: Davidson 23rd , Page : 542
Explanation : Specific indicator of acute pericarditis in ECG is PR interval depression .

Stem Breakdown:

Acute-onset left leg pain and coldness: This suggests a sudden loss of blood flow, which is concerning for an acute arterial occlusion.
Pale and pulseless leg: These findings confirm that the limb is ischemic due to an arterial blockage.
History of chronic atrial fibrillation: Atrial fibrillation increases the risk of thromboembolism, which can lead to arterial embolism.
Option Analysis:

A) Deep vein thrombosis: Deep vein thrombosis (DVT) affects the veins, not arteries, and typically causes swelling, pain, and warmth in the affected limb, not coldness or pulselessness.
B) Acute arterial embolism: This is the correct diagnosis. Davidson and Harrison explain that acute arterial embolism is a sudden blockage of an artery, often due to an embolus originating from the heart (e.g., in atrial fibrillation). The "5 Ps" of acute arterial occlusion are Pain, Pallor, Pulselessness, Paresthesia, and Paralysis.
C) Chronic venous insufficiency: Chronic venous insufficiency causes leg swelling, varicose veins, and skin changes, but it does not cause sudden limb ischemia or a pulseless leg.
D) Peripheral neuropathy: Peripheral neuropathy causes numbness, tingling, and weakness, but it does not cause acute pain or loss of pulses.

Reference: Davidson 23rd; P-482
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Stem Breakdown:

Recurrent episodes of chest pain, palpitations, and shortness of breath: These symptoms suggest a tachyarrhythmia, such as paroxysmal supraventricular tachycardia (PSVT).
ECG showing PSVT: PSVT is a common type of arrhythmia characterized by sudden onset and termination, often due to reentrant circuits in the atrioventricular (AV) node.
Option Analysis:

A) Beta-blockers: Beta-blockers can be used to control the rate in some arrhythmias, but they are not the first-line treatment for terminating acute PSVT episodes.
B) Adenosine: This is the correct answer. Davidson and Harrison recommend adenosine as the first-line treatment for acute PSVT because it temporarily blocks AV nodal conduction, terminating the reentrant circuit responsible for PSVT. It is highly effective and works within seconds.
C) Calcium channel blockers: Calcium channel blockers (e.g., verapamil, diltiazem) can be used to slow AV nodal conduction in PSVT, but they are typically second-line agents after adenosine.
D) Amiodarone: Amiodarone is used to treat ventricular arrhythmias and atrial fibrillation but is not the first-line treatment for acute PSVT. It has a longer onset of action compared to adenosine.

Diuretics, particularly loop diuretics like furosemide, are the first-line treatment for acute decompensated heart failure (ADHF) to relieve fluid overload. Davidson notes that diuretics reduce pulmonary congestion and improve symptoms of breathlessness and edema. Harrison emphasizes that while ACE inhibitors and beta-blockers are important in chronic heart failure, diuretics are crucial for acute management to quickly reduce volume overload.

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-546

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

Explanation:

Reference: Davidson 23rd; P-464
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

The pivotal investigation is echocardiography, which can confirm the diagnosis and also helps to identify the optimum site for aspiration of the fluid.

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

Explanation: ACE inhibitors causes angioedema

Due to volume and duration of right ventricular ejection remaining the same during inspiration and expiration, there is little inspiratory exaggeration of the splitting of S2 in ASD.

Constrictive pericarditis is a possibility when ascites is out of proportion to peripheral edema.

ECG abnormalities: T-wave inversion, ST depression and prolonged QTc interval

Reference: Davidson 23rd; P-515

Explanation: Some added sounds are physiological but may also occur in pathological conditions; for example, a third sound is common in young people and in pregnancy but is also a feature of heart failure
Davidson 23rd, Box-16.8

Explanation: Acute coronary syndrome is a term that encompasses both unstable angina and myocardial infarction

Reference: Davidson 23rd; P-533
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Reference: Practical Manual in Clinical Medicine by ABM Abdullah Sir; P-797

Reference: Davidson 23rd; P-524

First Heart Sound: 
Loud: hyperdynamic circulation (anaemia, pregnancy, thyrotoxicosis); mitral stenosis
Soft: heart failure; mitral regurgitation

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

Explanation

Explanation: heaving apex beat found in: Pressure overload, such as aortic stenosis, hypertension

Reference: Davidson 23rd; P-496

Myxomas are the most common type of primary cardiac tumor in all age groups, most commonly in third to sixth decade, with a female predilection.

Q waves May signify previous myocardial infarction

Reference: Davidson 23rd; P-514
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Reference: Davidson 23rd; P-514
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

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.