Advertisement Upgrade to remove ads

My notes from Chapter 2: Basic Electrophysiology Section: Ectrocardiogram Paper ECGs Made Easy 4th Ed., 2011 Barbara Aehlert, RN, BSPA

ECG

graphical representation of the heart's electrical activity [p50]

the machine records

the voltage (potential difference) between the electrodes [p50]

needle/pen of the ECGs

moves a specific distance depending on the voltage measured; made on ECG paper [p50]

ECG paper

graph paper made up of small and large boxes measured in millimeters [p52]

horizontal axis of the ECG paper

time; used to measure the interval between or duration of specific cardiac events; stated in seconds [p52]

ECG paper normally records at a constant speed of ___________.

25 mm/sec [p52]

each horizontal 1mm box represents____.

.04 seconds [p52]

large box represents

.20 seconds (5 small boxes) [p52]

vertical axis of the ECG paper measures...

the voltage or amplitude of a waveform [p52]

voltage is measured in ___.

millivolts (mV) [p52]
may be positive or negative

amplitude is measured in ____.

millimeters (mm) [p52]

the ECG machine's sensitivity must be calibrated so that a 1-mV electrical signal will produce a deflection measuring exactly...

10 mm tall [p52]

waveform

aka deflection, is a movement away from the baseline in a positive (upward) or negative (downward) direction [p52]

when electrical activity is not detected...

a straight line is recorded [p52]

each waveform on an ECG is related to ...

a specific electrical event in the heart [p52]

baseline or isoelectric line

electrical activity is not detected; a straight line is recorded [p52]

which leads see INFERIOR surface of the heart

II, III, aVF

which leads see SEPTAL surface of the heart

V1, V2

which leads see ANTERIOR surface of the heart

V3, V4

which leads see LATERAL surface of the heart

I, aVL, V5, V6

segment

a line between waveforms; named by the waveform that precedes or follows it [p56]

interval

a waveform and a segment [p56]

complex

several waveforms [p56]

biphasic waveform

partly positive, partly negative [p56]

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 above and try again

Example:

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

NEW! Voice Recording

Create Set