Loss: Using hybrid splitters / hybrid dividers / hybrid combiners, much less power is lost than if a resistive function had been used. When used as a splitter or divider the main level reduction is caused by the action of dividing the power between several ports.
Most scientific study has focused on ANP and BNP. Measurement of BNP helps doctors diagnose and treat congestive heart failure. In this condition, the heart is unable to pump blood efficiently, and the heart chambers swell with blood. As the heart cells stretch, they produce extra BNP, which pours into the bloodstream. By measuring blood levels of BNP, doctors can spot signs of congestive heart failure in its early stages, when it may be hard to distinguish from other disorders. A normal BNP level is about 98% accurate in ruling out heart failure.
Higher levels of BNP or NT-proBNP are often associated with a worse outlook (prognosis) for the person. Normal results indicate that the person's symptoms are likely due to something other than heart failure. BNP or NT-proBNP test may be ordered in a doctor's office when a person has signs and symptoms that could be due to heart failure. These may include: 1  Difficulty breathing, shortness of breath. 2  Fatigue. 3  Swelling in the feet, ankles, legs, abdomen.