Create an account
IF sensitivity is turned down to 1/2
the EKG will record all cardiac action at half its normal amplitude, deflections appear half as big, with waves half as tall
If sensitivity is increased to 2`
the EKG will record cardiac action at twice its normal amplitude, waves twice as tall
how is a calibration check done
automatically by the EKG, and the mark it produces is called a standardization mark
The universal standard for the calibration check
1 millivolt of electrical activity should deflect the stylus exactly 10mm high
Discharge of electrical energy in the heart that typically causes contraction of the heart muscle cells
term for the heart muschle cells electrically "resetting" itself or returning to its polarized state.
how can we determine the probable location of artifact voltages
by finding the commonalities within the views that record them
Somatic or muscle artifact AKA somatic tremor, AC interference (alternating current), wandering baseline, interrupted basline
cause of somatic artifact
pt movement, talking, or shaking due to cold or apprehension, vibration within the environment
Cause of AC interference
improper grounding, presence of an electrical field, "cross talking" from crossed lead wires
Causes of wandering baseline
loose sensors, oily skin or lotion on skin, corroded sensors, or improper electorlyte
how to obtain a good quality EKG
pt comfortable and relaxed, warm, pillow under head, adequate support for arms and legs
Chest lead requires what
placement precise and proper positioning in order to obtain the most accurate results
AKA baseline, relatively straight line that is recorded in the absence of electrical activity
standard limb leads
Leads I, II, III, they are bipolar and typically demonstrate upward, or positive deflections
aurgmented limb leads
aVR, aVF, aVL and are unipolar. They typically demonstrate downward of negative deflections
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together