Calculations/Settings
What is the standard EKG paper speed?
25mm/second
Which limb lead is the "common ground"?
Right leg
What is the normal RR for an adult?
12-20/minute
What does myocardial ischemia look like on an EKG strip?
ST segment depression and T wave inversion
Endocardium (inner), Myocardium (middle muscular), Epicardium (outer)
A patient's EKG shows 16 small boxes between R waves. What is the patient's heart rate?
94bpm
What would cause pauses in EKG activity during a holter monitor?
Loose lead connections.
What all should be included in a medication history?
Vitamins, OTC meds, herbal supplements
What is asystole?
complete stop of electrical activity
How many chambers are in the heart? What are they?
4
Rt and Lt atria
Rt and Lt ventricles
You count a PR interval to be 4 small boxes in length. What is the interval's time duration?
.16 seconds
How many electrodes are placed for a 3 channel holter monitor?
7
What is the J point?
junction point between QRS and ST segment
What are characteristics of sinus rhythms?
PR interval .12-.20 seconds
QRS <.12 seconds
P wave present
What is the strongest valve in the heart?
Mitral/bicuspid
You count the QRS length to be 3 small boxes. What is the time duration for this complex?
.12 seconds
How should you prep the pt for holter monitor electrode placement?
Clean skin with alcohol, remove hair, abrade skin
What is Wilson's Central Terminal?
central reference point for unipolar leads
What is a characteristic of atrial flutter presentation?
saw toothed
What is cyanosis and what is it caused by?
Blue discoloration caused by cardiac distress.
1. What does the vertical axis represent on an EKG strip?
2. What does the horizontal axis represent on an EKG strip?
3. What is the standard voltage for EKG?
1. voltage
2. time
3. 10mm/mV
Proper placement for V4?
5th intercostal mid clavicular
What is the normal heart rate for an adult?
An infant?
60-100bpm
100-160bpm
Where do electrical impulses start in the heart?
SA node