this system involves observing changes in the characteristics of murmurs and abnormal sounds during respiration , the valsalva maneuver , exercise , changes in posture , after pharmacologic agents and during arrhythmias , these techniques will aid in the accurate identification of the origin of the murmur or abnormal sound but do not necessarily indicate the presence or severity of cardiac disease .
C0003811
arrhythmias
C0018799
cardiac