Congestive heart failure, or simply heart failure, is progressive and should not be confused with a heart attack, which involves sudden tissue death of the heart muscle. Although heart failure may occur suddenly in some cases, gradual loss of function is more common.
I believe SI it stands for: Sacroiliac Joint Injections Sacroiliac (SI) joint injections are commonly used to determine what is causing back pain. SI joint injections are primarily diagnostic injections, meaning that they help your doctor determine the cause of your back pain but may not provide you with any long-term relief from the pain.
Sacroiliac joint. The sacroiliac (SI) joint is a diarthroidal joint as are the hip, knee and shoulder. The SI joint is responsible for connecting the spine to the pelvis and transmitting forces between the lower extremities and the spine. The joint can become hyper or hypo mobile in response to an injury.