Signal Pt.1
This catheter evaluates which atria is stimulated first
What is the CS catheter
filters out signals outside of a range of frequencies (30-500Hz)
band pass
filters out specific frequencies (60Hz)
notch pass filter
if retrograde conduction exists
delivered at a constant rate for short duration, but at successively faster rates with each pace
burst
This configuration of electrode is not effected by far field signals
what is bipolar
filters out signals above 500Hz
low pass filter
the best teacher at ATI is
Madison of course :)
Echo beats occur when
signal can go from atrium -> AVN -> back up to atrium (i.e. when fast pathway completely out of refractory by the time the slow pathway signal reaches it)
pace at a given rate for number of stimuli or seconds. Intervening pauses between each rate increase.
decremental
This helps with wavefront directionality
what is unipolar
filters out signals below 30Hz
high pass filter
this proves conduction occurred (50-120ms)
A-H interval
you know a pt has dual nodal physiology
because of the “Jump” to the slow pathway= AH >35 ms INCREASE.
Fast pathway: AH interval <150 ms.
Slow pathway: AH interval >200 ms
stimuli delivered at a constant rate (PCL), must be faster than baseline rhythm
overdrive
bipolar blindness
increases amplitude of all signals
gain
1st evidence of sinus node depolarization to deflection on HB lead (20-60ms)
P-A baseline interval
HIS potential to earliest ventricular activation (35-55ms)
H-V interval
drive train of paced complexes at a cycle length followed immediately by an extrastimulus at a different cycle length (S1x8,S2)
extra stim
Abbott Labatories made HD Wave Solution to solve what problem
bipolar blindness
A fractionated signal can produce this because of a scar tissue in the Ventricle
double potential
this is the normal order of an IEGM
1. HRA 2. HIS A 3. CS atrial 4.HIS deflection 5.RV 6. (HIS V & CS V)
when this happens the Sinus node impulse either fuses with extrastimulus or collides, leaving paced only atrial stimulation
Extrastimulus falling within last 20-30% of CL
gradual decrease of PCL every several paced complexes
ramp