03/09/2023
💥🇦🇴🇷🇹🇮🇨 🇸🇹🇪🇳🇴🇸🇮🇸(🇦🇸)
Defined as narrowing of Aortic valve(difficult to open during LV systole).
🅒🅐🅤🅢🅔🅢 :
1.
𝔻𝕖𝕘𝕖𝕟𝕖𝕣𝕒𝕥𝕚𝕧𝕖 𝕔𝕒𝕝𝕔𝕚𝕗𝕚𝕔𝕒𝕥𝕚𝕠𝕟
Initiated by Endothelial dysfunction >>> incrased Gap Between enfothelial cells>>> Macrophage,lipids go through the Gap to Sub-endothelial tissues >>> Inflammation is going on at Subendothelial tissue >>>> stimulates Fibroblast >>> Fibrosis of Aortic valve(AV) leaflets >>> Thikend leaflets >>> difficult to open at LV systole >>> AS.
2.
ℝ𝕙𝕖𝕦𝕞𝕒𝕥𝕚𝕔 𝕗𝕖𝕧𝕖𝕣(mechanisms same as Mitral stenosis )
3.
ℂ𝕠𝕟𝕘𝕖𝕟𝕚𝕥𝕒𝕝 𝔸𝕊.
💥🅟🅐🅣🅗🅞🅟🅗🅨🅢🅘🅞🅛🅞🅖🅨 💥
1.
AS >> less Cadiac output at LV systole due to narrow Aortic Opening >> LV যেহেতু এই বাধাকে overcome করার চেষ্টা করবে >>> LV needs more POWER to pump strongly through Narrow Aortic ভালভে >>> Increased pressure at LV which causes >>> LV hypertrophy >>> Enlargement of LV >>>> increased pressure Of LV >>> Eventually Left atrial hypertrophy ( যেহেতু LV এ pressure বেশি তাই Left atrium কে High pressure এর Against এ Pump করা লাগবে >>> Left atrial pressure বেশি হতে হবে>>>মানে LA hypertrophy হবে) >>> increased LA প্রেসসুরে >>> Pulmonary congestion >>> 🄳🅈🅂🄿🄽🄴🄰.
2.
Pulmonary congestion leads to increased Right ventricular pressure >>> 🄸🄽🄲🅁🄴🄰🅂🄴🄳 🄹🅄🄶🅄🄻🄰🅁 🅅🄴🄽🄾🅄🅂 🄿🅁🄴🅂🅂🅄🅁🄴,,,,,, 🄷🄴🄿🄰🅃🄾🄼🄴🄶🄰🄻🅈,,,,,,, 🄰🅂🄲🄸🅃🄸🅂,,,,,,🄿🄴🅁🄸🄿🄷🄴🅁🄰🄻 🄴🄳🄴🄼🄰..
3.
আবার আসি Increased LV pressure এ আর কি হয়??
🄰🄽🄶🄸🄽🄰(decreased perfusion of blood to LV myocardium.
কিভাবে??
1.
LV hypertrophy তে LV Muscle size increased হয় >>> needs more oxygen to produce adequate ATP for Muscle contraction.
2.
LV এ pressure বেশি যার ফলে LV এর wall এ জোরে pressure দেয় >>sub- Endocardium এর blood vessels গুলো constricted হয়ে যায় >>> decreased Oxygen supply to myocardium.
মানে একদিকে Myocardial oxygen demand বেড়ে যায় অন্য দিকে myocardial oxygen supply কমে যায়>>>🄰🄽🄶🄸🄽🄰.
3.
🅂🅈🄽🄲🄾🄿🄴 (At the time of exertion LV tries to Pump more blood >>> যদিও LV এর hypertrophy আছে strongly pump করবে >>>কিন্তু AS এ যে Narrow or***ce সেটা fixed থাকে >>> তাই LV জোরে pump করলেও Cardiac output significantly increase করবে না >>> decreased cerebral perfusion >>> loss of consciousness >>>🅂🅈🄽🄲🄾🄿🄴)
4.
🄷🄴🄰🅁🅃 🄵🄰🄸🄻🅄🅁🄴 (যদি Chronically LV pressure অনেক দিন ধরে বাড়তে থাকে >>>> LA pressure ও বাড়বে >>> Pulmonary congestion >>>> edema of whole bodies organ>>> dyspnea).