Where: QT Interval Time: 0.35 - 0.45 secs QTc - (OT corrected) Male \> 0.46 sec abnormal Female \> 0.44 sec abnormal

Width (time) 5 mm = 0.20 seconds Height (amplitude) 5 mm = 5 mV

Width (time) 1 mm = 0.04 seconds Height (amplitude) 1 mm = 1 mV

Quick Basics Flashcards by B B

PR Interval Duration

Where: Start P-wave to start of Q/R

Time: 0.12 - 0.20 secs

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QRS Complex Duration

Where: Start Q to end of S

Time: 0.08 - 0.10 secs

WIDE = 0.12 sec/120ms (LESS THAN 3 Small BOXES)

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ST-Segment Duration

Where: End of S to the start of T

What: All the ventricular myocardium is depolarized

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QT Interval Duration

Where: QT Interval

Time: 0.35 - 0.45 secs

QTc - (OT corrected)

Male > 0.46 sec abnormal
Female > 0.44 sec abnormal

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Inferior View of Heart

III

avF

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Septal View of Heart

_avR

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Anterior View of Heart

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Lateral View of Heart

avL

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Absolute Refractory

Cells do not respond to any stimulus

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Effective Refractory

Cells do not respond to conducted (cell-to-cell) stimuli, but will respond to other stimuli (cause arrhythmias)

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Relative Refractory

Cells respond to LARGER-than-normal stimulus

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Supernormal Refractory

Cells respond to weaker - than - normal stimulus

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Big Box Duration

Width (time)

5 mm = 0.20 seconds

Height (amplitude)

5 mm = 5 mV

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Small Box Duration

Width (time)

1 mm = 0.04 seconds

Height (amplitude)

1 mm = 1 mV

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P-Wave

Atrial Depolarization

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PR Segment

AV Node holding Action Potential from conducting

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PR Interval

The time between atrial depolarization and ventricular depolarization

0.12 - 0.20 sec (>0.20 sec/200ms is considered delayed/prolonged)

Supraventricular activity

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Q Wave

Basal Septum Depolarization

(0.04 sec or less)

R Wave

Ventricular Depolarization

S Wave

Basal Ventricular Depolarization

ST Segment

Ventricles are positively charged and there is no movement of ions

T Wave

Ventricular Repolarization

Ventricles are turning back to negative charges

U Wave

Repolarization of the Purkinje Fibers

(Not normally seen)

Origin of narrow (< 0.11 secs) QRS Complex

Supraventricular

Narrow (normal) QRS Complex

0.08 - 0.11 seconds | (or less than 0.11)

Wide QRS Complex

0.12 and above

QT Interval

When: Beginning of the QRS Complex to the end of the T Wave How Long: \< 0.44 What: Covers the entire ventricular activity.

Which Segment is used to determine if the ST segment is elevated or depressed?

TP Segment

P wave begins and end at the \_\_\_\_\_\_\_\_

Isoelectric Line

Q wave begins and end at the \_\_\_\_\_\_\_\_

Isoelectric Line

R wave begins and ends at the \_\_\_\_\_\_\_\_

Isoelectric Line

S wave begins and ends at the \_\_\_\_\_\_\_\_

Isoelectric Line

ALL wave begins and ends at the \_\_\_\_\_\_\_\_

Isoelectric Line

Q-Wave Morphology q = \_\_\_\_\_\_\_\_\_ Q = \_\_\_\_\_\_\_\_\_

q = Physiologic Q = PATHologic

Q-Wave Morphology Q = represents what pathology

Pathologic Q waves are a sign of **previous myocardial infarction.** They are the result of the absence of electrical activity. A myocardial infarction can be thought of as an electrical 'hole' as scar tissue is electrically dead and therefore results in pathologic Q waves.

Q-Wave Morphology Q = How do you recognize pathologic Q Wave?

* \> 0.04sec or 40 ms (1 mm) wide. * \> 25% of depth of QRS complex. * Seen in leads V1-3.

PR Interval Represents

Wave goes over the atrium and through the AV node and ends just before it activates the ventricles to depolarize

PR segment represents

Depolarization of the AV node. It’s a flat line because the wave is not strong enough to be recorded on the voltmeter.

Q wave

Ventricular Septal Depolarization

R wave

Resultant or major ventricular muscle depolarization. The resultant vector is directed downward and leftward.

S Wave

Basal Ventricular depolarization The base of the ventricles connects to the atria.

ST segment

All the ventricular myocardium is depolarized.

T wave represents

Ventricular repolarization

QT interval

* It covers the entire ventricular activity. * Captures the beginning of ventricular depolarization through the plateau phase to the ventricular repolarization.