ECG (main)

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This page is for adult patients. For pediatric patients, see: ECG (peds)

Measurement

All these measures are valid for the standard paper speed of 25 mm/Sec

  • 1 small box = 1mm = 0.04 sec = 40 miliseconds
  • 5 small boxes = 1 big box = 5mm = 0.2 sec = 200 miliseconds
  • Standard 12 lead ECG duration = 10 seconds
Interval Time(s) Boxes
PR 0.12 - 0.20 3-5
QRS 0.06 - 0.10 1.5-2.5
QTc <0.44 N/A

Primary Analysis

Segments & Intervals

SinusRhythmLabels.svg
Conduction system of the heart.
Grid.png

Waves

Hypertrophy/Enlargement

Cardiac Hypertrophy and Enlargement

Differential includes ischemic events, electrolyte abnormalities, and medication overdoses in addition to rheumatologic conditions[1][2]

Types of second degree AV block

AV Blocks

Bundle and Fascicular Blocks

Premature Beats

See Also

External Links

Videos

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References

  1. Hampton, JR. The ECG in Practice (5th edition), Churchill Livingstone 2008.
  2. Wagner, GS. Marriott’s Practical Electrocardiography (11th edition), Lippincott Williams & Wilkins 2007.