Eisenmenger syndrome occurs when a congenital heart defect is not detected early enough to be treated before damage to the lung arteries occurs. If you or your child receives a diagnosis of a heart defect, it's important to start treatment promptly, including having surgeries or procedures to help correct the defect.
An acute angle is an angle with a measurement between 0Â° and 90Â°, or with less than 90Â° radians. It's the smallest of six different types of angles. There's an easy way to remember that an acute angle is small: think of it as a cute angle, perhaps visualizing a cute child playing an acute angle in a play about geometry.
Note that an angle measuring exactly 90Â° is not an acute angle. Instead, it's a right angle. When you think of angles, you should think of them as part of the radius of a circle, which is 360Â° in total. An acute angle makes up less than one-quarter of that circle's radiusâagain, less than 90Â°.