π« FREE MSRA PODCAST β Aortic Stenosis: High-Yield & Unmissable for Exams π―
Aortic Stenosis can quietly progress until it becomes life-threatening. In this episode, we give you the clearest, quickest breakdown of what you absolutely need to know for the MSRA: causes, symptoms, investigations, and the life-saving management decisions you'll be expected to know.
π What youβll learn (with recall tips):
β Definition:
ββ’ Narrowing of the aortic valve β obstructed flow from left ventricle to aorta
ββ’ Leads to pressure overload and eventual heart failure
β Causes:
β⒠𧬠Congenital: Bicuspid valve (remember "Bi before Bye")
ββ’ π΅ Degenerative/Senile Calcification β most common in elderly
ββ’ π₯ Rheumatic heart disease
ββ’ π§ HOCM (subvalvular), π§βπ Williams syndrome (supravalvular)
β Symptoms:
ββ οΈ The classic triad (only in ~30β40%):
β1οΈβ£ Chest pain
β2οΈβ£ Exertional dyspnoea
β3οΈβ£ Syncope
βπ§ May be absent until disease is severe!
β Clinical Signs:
ββ’ Ejection systolic murmur β radiates to carotids
ββ’ π Slow-rising, weak pulse (pulsus parvus et tardus)
ββ’ π Soft/absent S2, S4 gallop, systolic thrill, narrow pulse pressure
β Investigations:
βπ§ͺ Bloods: FBC, U&Es, LFTs, BNP, Troponin
βπ ECG: LVH, P mitrale, ST depression, LBBB
βπ« Echo = GOLD STANDARD:
βββ’ Mild: Mean gradient <25 mmHg
βββ’ Mod: 25β40 mmHg
βββ’ Severe: >40 mmHg, area <1 cmΒ²
βββ’ Very severe: >80 mmHg, area <0.5 cmΒ²
βπΈ CXR, CT calcium scoring, angiography if surgery planned
β Management:
ββ’ Supportive if mild/asymptomatic
ββ’ Monitor with 6β12 monthly echoes
ββ’ AVR for symptomatic/severe AS
ββ’ TAVI for older/high-risk surgical patients
ββ’ Choose mechanical vs bioprosthetic valve based on age & anticoagulation tolerance
ββ’ π Diuretics carefully if fluid overload (avoid nitrates in severe AS)
β Complications:
ββ’ π Heart failure
ββ’ π Arrhythmias, MI
ββ’ π§ Stroke
ββ’ π¦ Infective endocarditis
ββ’ π Acquired von Willebrand disease
ββ’ β°οΈ Sudden cardiac death
β Epidemiology:
ββ’ π§ Most common valvular disease in UK
ββ’ π΄ ~10% prevalence in adults >80
ββ’ π¨ββοΈ Male predominance ~4:1
ββ’ π Prevalence rises sharply with age
π More MSRA resources on Aortic Stenosis:π Revision Notes: https://www.passthemsra.com/topic/aortic-stenosis-revision-notes-2/
π§ Flashcards: https://www.passthemsra.com/topic/aortic-stenosis-flashcards-2/
π§© Accordion Q&A: https://www.passthemsra.com/topic/aortic-stenosis-accordion-qa-notes-2/
π Topic Page: https://www.passthemsra.com/?post_type=sfwd-topic&p=23568&preview=true
π Main Site: https://passthemsra.com
π Free Questions: https://freemsra.com
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