One important point to note with Holter monitor recordings is that dogs with ventricular arrhythmias can have up to 85 % variation in the number of abnormal heartbeats simply on a day - to - day basis without any treatment. (themeowingvet.com)
The Horehound herb helps in improving the regularity of cardiac contraction in low doses, but a physician must be consulted before using it in this situation, and larger doses may cause abnormal heartbeat. (store.newwayherbs.com)