Random Facts
Irritable location in the atria?
Foci
How many atrial impulses fire at the same time?
Hundreds
What is atrial kick?
The last little push from the atria to get every drop of blood out
What is the difference between conductive and contractile cells?
Conductive cells- Create the electricity impulse
Contractile cells- Do all the work
How long are holter monitors warn?
24 hours
The ability to create an impulse without outside stimulation
Automaticity
What can frequent PAC's be a sign of?
impending heart failure, atrial fibrillation, or impending atrial tachycardia.
What is the difference between polarization, depolarization, and repolarization?
Polarized is where there is no charge, Depolarized is where a charge is being sent out, and Repolarized is where the charge is beginning to leave and the cell is returning to a polarized state.
What does the P-wave represent?
Atrial depolarization
During a stress test, the stress test is continued until at least what percentage of the target heart rate acheived?
85%
One small block on ECG paper= __mm __sec __mv
.1 mm .04 sec .1 mv
Atrium is not a main pacemaker, but can do what?
Can fire in escape capacity or usurp
What is the correct order of the heart's conduction pathway?
SA Node, Av Node, Bundle of HIS, Left/Right bundle branches, Purkinje Fibers
What is systole and diastole?
Systole- Ventricles at work
Diastole- Ventricles at rest
how many electrodes are attached to the trunk of the body during holter monitoring?
5 or more electrodes
Which branch in the nervous system causes fight or flight?
Sympathetic nervous system
How are premature beats fired out?
By irritable atrial tissue before the next sinus beat is due.
What is Diastole and Systole?
Diastole: Ventricles are at rest/not at work
Systole: Ventricles are at work
What rhythm do the small f-waves go with?
Atrial fibrillation (A-Fib)
how do you figure out the target heart rate during a stress test
220 - pt age
What is it called when the pacemaker fails/is too slow so a lower pacemaker takes over
An escape
Where is the AV junction tissue located?
Between right atrium and ventricle and surrounding the AV node.
create an impulse, pass the impulse, respond to impulse (depolarization), and contract.
Where exactly is v4 placed on the PT?
5th intercostal space, midclavicular line, QRS isoelectric
during a holter monitoring what skin prep involves the outer layer of skin so electrodes will adhere
abrading