Describe a kick fracture.
A kick fracture is a fracture from knocking leads together? Causes cyclical, regular to cardiac cycle, high frequency, stable amplitude noise on a lead.
What programming changes should you make to fix RNRVAS?
DON’T shorten PVARP. Shorten PAVD and / or turn off SIR/rate response to move the VP away from the AP.
Define rheobase.
The minimum energy required to capture the heart at an infinite pulse width/duration.
Define chronaxie.
The minimum time/duration at 2x the rheobase (the most efficient pacing output).
If you increase the tilt value, will you increase or decrease the pulse width waveform?
Increase, as it will take longer to deliver the first half of the shock. Higher tilts will work better in lower impedance scenarios.
What are some clues that the EGM is epicardial pacing?
Big latency from a complex on an ECG to an AS/VS marker, bit of fractionation before the signal too.
How can you tell on a Boston EGM if the signal is blanked or in refractory? Is VSP available?
Straight brackets are blanked, round brackets are refractory. No VSP on Boston devices.
What is a highpass filter effective for?
Reducing TWOS.
What is slew rate and what are typical measurements for the V lead and the A lead?
Measured from the steepest slope, it is the rate of voltage change over time. V is 0.75V/s and A is 0.5V/s.
