<prompt> Murmur increasing with Valsalva manouvre aEURVSDHOCMMSAS  <response>: HOCM EFFECT OF VARIOUS INTERVENTIONS ON SYSTOLIC MURMURS Valsalva maneuver Most murmurs decrease in length and intensity with valsalva mane- uver. Two exceptions are:? - HOCM -- becomes louder - Mitral valve prolapse - becomes longer and louder Mitral Regurgitation The systolic murmur of M.R. is reduced during the strain phase of valsalva maneuver. 