15 High Yield EKG

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• P

• QRS

• Intervals

• ST

P

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• regular: spacing between QRS same

QRS

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Intervals

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• atheletes (high vagal tones) and beta blockers prolong PR

ST

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Practice 1

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• easily identifiable P

• upright P in II, III, AVF: normal sinus P

• QRS: regular

• QRS: narrow

• PR: less than 1 block

• QT: less than half

• ST: no significant depression, elevation

Practice 2

• P: upright in II, III, AVF, normal sinus P

• RR: regular QRS

• QRS: wide in V1, upright QRS in V1 RBBB

• PR: not prolonged

• QT: less than 1/2

• ST: T inversion in V1, normal in RBBB

Practice 2

• P upright in II, III, AVF, sinus

• QRS wide, negative V1, LBBB

• peaked T and ST elevation in V1-3: common

• T inversion 1, L, V5, V6: normal in LBBB

Practice 4

• no clear P waves, afib

• irregularly irregular: QRS closer in some, farther apart in others

Practice 5

• sawtooth, aflut

Practice 6

• ventricle contracts on its own

• buried P waves at different rate as QRS (AV dissociation)

VFib

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• top: VFIB, cardiac arrest

PAC, PVC

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• top: early wide QRS, PVC, something stimulated ventricles to contract on its own (high catecholamines, infection, surgery)

• bottom: early narrow QRS with compensatory pause after