Left ventricular Hyperopy is caused by all, Except:
Answer is A (Mitral Stenosis) Isolated Mitral Stenosis is not associated with Left Ventricular Hyperophy Isolated Mitral Stenosis is not associated with Left ventricular Hyperophy The burden of Mitral Stenosis (from obstruction of flow across the mitral valve) is received by the left atrium followed by pulmonary circulation, right ventricle and right atrium in that sequence Left ventricle is off loaded and neither receives pressure overload nor volume overload and hence does not show any hyperophy Pathophysiological overload features from Mitral Stenosis may results in Left Atrial Hyperophy ( tleji Atrial pressure) Pulmonary Hypeension (Dilatation of pulmonary vessels) Right ventricular Hyperophy (Secondary to pulmonary Hypeension) Right Atrial Hyperophy (May be seen with severe M.S. secondary to Pulmonary Hypeension Aoic Stenosis, Aoic Regurgitation and Mitral Regurgitation may all lead to Left Ventricular Hyperophy Left Ventricular Hyperophy may result from either pressure overload (e,g AS) or volume overload (MR, AR etc) of the left ventricle Left Ventricular Hyperophy Pressure Overload Volume Overload * * * Occurs when hea is forced to pump against increased resistance such as - Systemic Hypeensions - Aoic stenosisQ These conditions cause systolic overloads This causes concentric Hyperophyv of left ventricle. (ventricular wall thickens in relation to ventricular cavity) * * * * * Occurs when end diastolic wall stress is such as valvular regurgitation Aoic Regurgitation Mitral Regurgitation These conditions cause diastolic overloadQ This causes Eccenteric hyperophye of Left ventricle (Ventricular wall thickness remains normal in relation to chamber dilatation Systolic overload on ECG is characterized by : - TQRS voltage - Depressed ST segment in left precordial - Inveed T waves Lead Diastolic overload on ECG is characterized by - Tall Late 'R' waves in V5 & V6
M.S (Mitral stenosis)
A. S (Aoic Stenosis)
M.R (Mitral Regurgitation)
A. R (Aoic Regurgitation)