Everything Flashcards
The A-H interval
55 - 130 msec
The HV interval
35 - 55 msec
The PA interval (p wave to A on HIS catheter)
10-45 msec
1st degree AV Block
Prolonged PR intervals, constant and prolonged.PR > 200 msec
2nd Degree AV Block, Mobitz 1 (Wenkebach)
PR interval gets progressively longer before a QRS interval gets dropped.
2nd Degree AV Block, Mobitz 2
PR interval is elongated but constant then a QRS gets dropped.
Decremental Pacing
pacing at a progressively increasing heart rate by decreasing the amount of time between each paced beat. Used primarily to induce tachycardias. Also called “ramp pacing”
Programmed Electrical Stimulation consists of what 3 types of pacing
1) Incremental (burst)
2) Decremental (ramp)
3) Extrastimulus
Pacing drive train
a series of 6 - 10 fixed paced stimuli at a constant rate that are separated by a pause. S1
Incremental (burst) pacing
pacing the heart at a fixed rate
Extrastimulus pacing
for the standard EP study to test the refractory periods, one extrastimulus (S2) will be used
Absolute Effective Refractory Period (AERP)
no matter how strong the stimulus is, the cell cannot depolarize.
Relative Refractory Period
Access where the vessel is punctured with a sharp hollow needle, syringe is detached and guidewire is advanced through the lumen of the needle, and then the needle is withdrawn
Seldinger technique
SNRT
Sinus Node Recover Time - the interval measured in the high right atrium (HRA) from the last paced complex to the first spontaneous complex after the cessation of pacing.
