PM Timing Intervals Flashcards
What is the programmable post-ventricular interval during which events sensed in the ventricle do not cause resetting of a timing cycle?
Ventricular Refractory period (VR)
in dual-chamber pacing, the period of time (ms) between an atrial event and a scheduled paced ventricular event is?
Paced Atrial-Ventricular Delay (PAV)
period during which the pacemaker cannot see any atrial activity?
Atrial Blanking period (AB)
an interval during which the device prevents false inhibition by monitoring for non-physiologic ventricular sensed events?
Ventricular Safety Period (VSP)
programmable interval during PVARP during which any atrial sensing is blocked?
Post Ventricular-Atrial Blanking period (PVAB)
the lowest rate in which pacing will occur in the absence of intrinsic atrial activity?
Lower Rate limit (LR)
Consists of the AV interval plus the post ventricular atrial blanking period?
Total Atrial Blanking (TAB)
Consists of the Sensed AV interval (SAV) and PVARP?
Total Atrial Refractory Period (TARP)
What components make the Total Atrial Refractory period (TARP)?
Sensed AV (SAV) interval and PVARP
Total Atrial Refractory Period (TARP) is used for what purpose?
used to determine 2:1 block rate and wenkebach behavior of the pacemaker
defines the max rate the PM will pace the ventricles in response to tracking of atrial events?
- Upper Tracking Rate (UTR)
- intrinsic rates greater than the UTR may cause 2:1 block
period following a VS or VP in which the pacemaker cannot see/sense ventricular activity?
Ventricular Blanking period (VB)
programmable period following a ventricular event intended to prevent pacing the ventricles to quickly in response to fast atrial events (PAC, atrial arrhythmias, or retrograde P-waves) and occurrence of pacemaker mediated tachycardias (PMT)?
Post Ventricular Atrial Refractory Period (PVARP)
in dual chamber pacing, the period of time elapsing between a ventricular event and the next scheduled atrial pace?
Ventricular-Atrial interval (VA)
Which timing intervals are seen on the atrial channel?
- AB
- AV delay (SAV/PAV)
- PVAB
- PVARP
- TARP
interval following an atrial pace during which an atrial event is not seen by the ventricular channel of the pacemaker, prevents crosstalk or inhibition of a need VP?
Post Atrial Ventricular Blanking interval (PAVB)
What is the PAVB?
- Post AV Blanking interval
- the interval after an atrial pacing stimulus during which the ventricular event is not seen by the atrial channel of the pacemaker
period where an atrial event will be sensed but does not affet the pacemaker timing cycle?
Atrial Refractory Period
What is the purpose of the ventricular safety period (VSP)?
- to prevent pacing inhibition d/t cross-talk
- prevents pacing on t-wave
Why is the Paced AV (PAV) interval longer (appx 30ms) than the Sensed AV (SAV) interval?
- the PAV interval is longer then the SAV to account for the slower cell to cell propagation pathway
- pacing site may no be near the conduction p-way so time is needed to allow signal to reach the p-way
How long is the ventricular safety period (VSP)?
110 ms interval that starts after atrial paced event
What is the purpose of the Atrial Blanking period?
to prevent sensing AP output or AS depolarization
What is the purpose of the Post Ventricular Atrial Blanking period (PVAB)?
- prevents crosstalk or sensing of the ventricular signal (VS or VP) on the atrial channel
Which timing intervals are seen on the ventricular channel?
- Post Ventricular Atrial Blanking (PVAB)
- Ventricular Safety Period (VSP)
- Ventricular Blanking (VB)
- Ventricular Refractory Period (VRP)
Which 2 timing intervals prevent crosstalk?
- PVAB
- PAVB
What is the purpose of the Ventricular Refractory Period?
- prevents double counting of wide R-waves and T-wave sensing
