From the parasternal long axis view, a thickening of the aortic valve leaflets can be appreciated, along with reduced excursion of the aortic valve leaflets (right and non coronary cusps can been seen from this view). Color Doppler typically reveals aliasing that begins at the level of the aortic valve. This is also a good view to assess for aortic regurgitation. This is the view from which the diameter of the aortic valve annulus should be measured at end systole.
Transducer placed on the left sternal border
3rd or 4th intercostal space
Notch pointed towards the patient's right shoulder (11 o'clock)