dubin b

Question 1

premature atrial beat (PAB)

Answer 1

originates suddenly in an irritable focus, produces a P’ wave earlier than expected, or hides in T wave, making it taller than usual

Question 2

resets

Answer 2

a center of automaticity ____ its rhythm when it is depolarized by a premature stimulus

Question 3

aberrant ventricular conduction

Answer 3

if ventricular conduction system is depolarized by a Premature Atrial Beat but one Bundle Branch is not completely repolarized (still a little refractory), produces slightly widened QRS for one cycle

Question 4

non-conducted

Answer 4

a ________ premature atrial beat is unable to depolarize a refractory AV node, no ventricular (QRS) response, does depolarize SA node to reset the pacemaking cycle

Question 5

atrial bigeminy

Answer 5

an irritable automaticity focus fires a Premature Atrial Beat that couples to the end of a normal cycle, and repeats this process by coupling a PAB to the end of each successive normal cycle, resets cycle

Question 6

couplet

Answer 6

the cycle containing the premature beat together with the cycle or cycles to which it couples

Question 7

atrial trigeminy

Answer 7

when an irritable atrial focus prematurely fires after 2 normal cycles repeatedly

Question 8

premature junctional beat

Answer 8

when an irritable focus in the av junction spontaneously fires a stimulus, widened qrs

Question 9

junctional bigeminy

Answer 9

when an irritable junctional focus fires a premature stimulus coupled to the end of each normal cycle

Question 10

junctional trigeminy

Answer 10

when an irritable junctional focus fires a stimulus after two consecutive normal cycles

Question 11

ventricular

Answer 11

a _____ focus can be made irritable by low O2, Low K+, pathology (mitral valve prolapse)

Question 12

Premature Ventricular Complex (PVC)

Answer 12

produced on EKG by irritable ventricular focus that suddenly fires, occur early in cycle, easily recognized by their great width and enormous amplitude, usually opposite polarity of normal QRS, weaker pulse bc ventricles aren’t filled yet

Question 13

unifocal

Answer 13

6 or more PVCs per minute is pathological, if they are identical, they are _____ (from the same focus)

Question 14

ventricular bigeminy

Answer 14

when a PVC becomes coupled with a normal cycle with every cycle

Question 15

ventricular trigeminy

Answer 15

when a PVC couples with every two normal cycles

Question 16

ventricular parasystole

Answer 16

produced by a ventricular automaticity focus that suffers from an entrance block that is not irritable. not vulnerable to overdrive suppression

Question 17

ventricular tachycardia

Answer 17

a run of three or more PVC’s in rapid succession, if lasts longer than 30 seconds it is sustained

Question 18

mitral valve prolapse (MVP)

Answer 18

causes PVC’s, including runs of VT and multifocal PVC’s, yet it is considered a benign condition, the mitral valve is floppy and billows into left atrium during ventricular systole

Question 19

R on T phenomenon

Answer 19

if a PVC falls on a T wave, particularly in situations of hypoxia or low serum potassium, dangerous arrhythmias may result

Question 20

tachyarrhythmias

Answer 20

rapid rhythms originating in very irritable automaticity foci