Respective prevalence of the different carpentier classes of mitral regurgitation: a stepping stone for future therapeutic research and development.

Objectives: To determine the prevalence of mitral regurgitation (MR) in the U.S. adult population by classifying its mechanisms according to Carpentier's functional class.

Heart rate variability index in trauma patients.

Background: Heart rate variability (HRV) changes often reflect autonomic dysfunction with high sensitivity, but the specificity is also low. There are several different methods for measuring HRV, but interpretation is often complex, and the units are not interchangeable. For these reasons, HRV monitoring is not routinely used in many clinical situations.