Pacemaker with vasovagal syncope detection

摘要

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, this embodiment preferably detects a rate drop from above said first threshold to below a second threshold rate, and also preferably detects a stable rate below said second threshold rate.;Adaptations to avoiding pacing activation during sleep and combinations of the various embodiments are discussed.