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.
2001 - The FDA has approved the Triage BNP blood test by Biosite Diagnostics for early diagnosis of CHF in people age 55 years and older. The test measures levels of BNP (B-type natriuretic peptide) in your blood.t measures levels of BNP or B-type natriuretic peptide. Levels of this hormone are very high in people with acute heart failure. Doctors have often been wrong when faced with a person having CHF, calling it asthma, respiratory infection, pneumonia, or gallstones.