pNNx: Time Domain Heart Rate Variability Analysis

Software for measuring pNNx, a family of time-domain heart rate variability statistics of which the widely-used pNN50 is a member, has been contributed to PhysioNet. The study that introduced pNNx made use of several PhysioNet databases as well as additional data that have also been contributed to PhysioNet, including the Congestive Heart Failure RR Interval Database, the Normal Sinus Rhythm RR Interval Database, and the remainder of the Fantasia Database (see the news item for 2 March below).