Final Part 2 Flashcards
literally means without rhythm and it is used to denote any abnormal rhythm
arrhythmia
define arrhythmia
An arrhythmia is an abnormal rhythm
define depolarization
Depolarization occurs in the 4 chambers of the heart first the atria and then both ventricles. The SA Node on the wall of the right atrium initiates depolarization in the right and left atria, causing contraction which is symbolized by the P wave on an electrocardiogram
causing contraction
depolarization
the term regular in cardiac monitoring indicates
indicates a rhythm of constant rate.
A P-wave basically is
depolarization passong rapidly through the atrial myocardium produces the P wave on a EKG
A QRS complex is produced by what on a EKG
ventricular depolarization
When the ventricular myocardium depolarizes it produces a
QRS complex on the EKG
A U wave basically is
The final phase of Purkinje depolarization which may record a small hump, the U wave following the T wave on a EKG.
overdrive suppression
allows the automaticity center with the fastest rate to be the dominant pacemaker. NO competition
allows the automaticity center with fastest rate to be the dominant pacemaker (no competition)
SA Node overdrive suppression
Rhythms that lack a constant duration between paced cycles are said to be
irregular
What are irregular rhythms
rhythms that lack a constant duration between paced cycles
The term irregularly irregular describes
an old designation that describes an irregular and chaotic rhythm that has not predictable recurring pattern
When is the term parasystolic said
When automaticity focus has entrance block it is said to be parasystolic the focus paces but can’t be overdrive-supressed
the focus paces but can’t be overdrive-supressed
parasystolic
an irregular rhythm normal rate range, the pacemaking activity wanders from the SA Node atrial foci
Wandering Pacemaker
Define a Wandering Pacemaker
it is a irregular rhythm produced by the pacemaker activity wandering from the SA Node to nearby atrial automaticity foci. Produces cycle length variation as well as variation in the shape of the “P” waves. The overall rate is within normal range
P’wave shape varies, atrial rate less than 100 irregular ventricular rhythm
wandering pacemaker
cycle lengths vary, P wave morphology (shape) varies as the pacemaking center moves
Wandering Pacemaker
MAT
Multifocal Atrial Tachycardia
entrance block
parasystole
having more than one focus
multifocal
An rhythm of patients with COPD, heart rate is over 100 bpm, P’ waves of various shapes, since three or more atrial foci are involved
MAT— Multifocal Atrial Tachycardia
a rhythm sometimes associated with digitalis toxicity in patients with heart disease
MAT— Multifocal Atrial Tachycardia
Is caused by continuous rapid-firing of multiple atrial automaticity foci, no single implies depolarizes the atria completely, an only an occasional, random atrial depolarization reaches the AV Node tone conducted to the ventricles: this produces an irregular QRS rhythm.
atrial fibrillation
Describe Atrial Fibrillation
it is an irregular rhythm, continuous chaotic atrial spikes, irregular ventricular rhythm
not an arrhythmia of healthy young people, results of multiple “irritable” atrial foci, suffering from entrance block, pacing rapidly
Atrial Fib
no single impulse completely depolarizes both atria, there are no P wavs, just a series of erratic spikes on EKG
Atrial Fib
has an irregular rhythm in which we see discernible P waves, P waves are not identical, the rate does not gradually increase, the rate is less than 100, P waves are of different shapes
Wandering Pacemaking
