What is aortic stenosis with regurgitation?
summary
When the area of normal aortic valve is more than 3.0cm2, it is mild stenosis when the area of aortic valve is reduced to 1.5cm2; 0 cm 2 was moderate stenosis 0 cm 2 was severe stenosis. What is aortic stenosis with regurgitation? Next, I'll tell you something.
What is aortic stenosis with regurgitation?
Labor dyspnea is caused by the decrease of left ventricular compliance and left ventricular enlargement, the increase of left ventricular end diastolic pressure and left atrial pressure, resulting in the increase of pulmonary capillary pressure and pulmonary arterial hypertension. With the development of the course of disease, dyspnea can occur in daily activities, as well as sitting breathing. When there are fatigue, emotional excitement, respiratory tract infection and other inducements, labor dyspnea can occur, It can induce acute pulmonary edema.
One third of patients with angina pectoris may have exertional angina pectoris. The mechanism may be as follows: during the contraction of hypertrophic myocardium, the left ventricular internal pressure and end systolic wall tension increase, and the ejection time prolongs, resulting in the increase of myocardial oxygen consumption; Myocardial contraction makes the increased pressure squeeze the small branches of the coronary artery in the wall of the ventricle and decrease the coronary flow; Left ventricular diastolic compliance decreased, end diastolic pressure increased, coronary perfusion resistance increased, coronary perfusion decreased, especially subendocardial myocardial ischemia; Severe stenosis of valve orifice, decrease of cardiac output and mean arterial pressure can lead to decrease of coronary blood flow. Angina pectoris mostly occurs during sleep at night and after work, with cough, mostly dry cough; When complicated with bronchitis or pulmonary infection, cough with mucoid or purulent sputum, obvious enlargement of left atrium and compression of bronchus can also cause cough.
The mechanism may be as follows: during exercise, the peripheral vascular resistance decreases but the cardiac output cannot increase correspondingly; After the exercise stopped, the amount of return blood decreased, left ventricular filling and cardiac output decreased; Exercise aggravates myocardial ischemia, leads to sudden weakening of myocardial contractility and decrease of cardiac output; During exercise, there may be various arrhythmias, leading to a sudden decrease in cardiac output, especially the sudden decrease in cardiac output, resulting in a significant lack of blood supply to the brain, which can lead to syncope.
matters needing attention
In severe stenosis, due to decreased cardiac output, systolic blood pressure and pulse pressure, elderly patients are often accompanied by main atherosclerosis, so the systolic blood pressure is not significantly reduced, the heart murmur boundary can be normal, the heart failure expands to the left, the apical region can touch the systolic lifting pulse, and the left decubitus can present double pulse, The first is atrial contraction to increase left ventricular filling, and the second is ventricular contraction, which is continuous and powerful. Systolic tremor can be felt at the bottom of heart, supraclavicular fossa and carotid artery.
