Why must left ventricular pressure be greater than aortic pressure during ventricular ejection?Anatomy-Heart

In the healthy myocardium left ventricular pressure is
higher than aortic pressure because the left ventricle of the heart propels blood into
the aorta and aortic arch which then pushes the blood into the brachiocephalic, left
common carotid, and left subclavian.  However, in different types of cardiac disease
this is not the case. A good example of this is left ventricular hypertrophy. With LVH
the inherent pressure of the left ventricle can be decreased due to the hypertrophic
chamber. All hypertrophied muscles are not necessarily a positive situation. LVH
commonly causes backflow of blood and myocardial and pulmonic congestion which leads to
a multitude of problems. This would adversely affect the cardiac output (lower it) and
disrupt the normal filling times of the other chambers.