Pacemaker with vasovagal syncope detection

Abstract From the Canadian patent

Pacemaker with improved detection methods for occurrence of vasovagal syncope episodes. Increased rate pacing followed by fallback to lower rate is a retained feature. The lower rate need not be related to the increased pacing rate. One alternative detects stable or persistent rate below a threshold rate after a rapid rate drop through the threshold rate. Another alternative detects a "top rate" as a highest persistent rate and compares the difference between it and the rate that follows a rate drop through a "drop rate" or other threshold level. Yet another alternative finds a persistent rate above a first threshold rate before initiating the rate drop detection function. Once initiated …