ECG UMFT at University Of Medicine And Pharmacy Of Timisoara | Flashcards & Summaries

Lernmaterialien für ECG UMFT an der University of Medicine and Pharmacy of Timisoara

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Limb Leads (frontal plane)?

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D1-D3 & aVL/aVR/avF

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Precordial/Chest leads (transverse plane):

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V1-V6

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Vertical Axis: Units

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1 small square= 1mm(0,1mV)

  1 large square= 5mm(o,5mV)

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Horizontal axis:

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 1 small square= 0,04 sec 

 1 large square= 0,2 sec

  5 large squares= 1 sec

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ECG Leads: (cardial areas) 

Lateral :

Anterior:

Septum: 
Apex: 

Inferior:

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Lateral L1; aVL; V5; V6

Anterior V1V2

Septum: V3
Apex: V4

Inferior L2; L3; aVF

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P-wave:

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Morphology:

-round, symmetrical

,-possibly notched/bifid (DII)

  -biphasic (+/) in V1

- positive in DI, DII and aVF

- negative in aVR

Duration: 0,06-0,10sec

Amplitude: maximum in DII (0,5-1,5mV)

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PQ(PR) Interval: duration


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Duration: 0.12-0.20 sec, 

(-constant to repeated determinations

-->PQ interval variation in physiological respiratory arrhythmia 

Meaning = Atrioventricular conduction (P wave + PQ segment))

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QRS complex:

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Duration: 0,08-0,1sec


Ventricular depolarization

Morphology: 

-depends on the position of the exploring electrode and the electrical position ofthe heart

-positive in most leads, mandatory negative in aVR, V1 and V2



Amplitude:

- R-wave in limb leads=5-14 mm

-R-wave in chest leads=10-25 mm

-the amplitude of the R wave increases progressively from V1->V6


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Q-wave:


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Meaning

-mandatory missing in aVR, V1->V3

-there may be a larger Q wave in DIII that disappears at deep inspiration

Duration: <0,04 sec

Amplitude:< ¼ from R wave

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ST-Segment:

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Last part of ventricular depolarization

Duration: 0,05-0,15 s

Position to the isoelectric line:

-it starts at J point ("junction"), located at the limit between S wave and ST-segment

-on the isoelectric line or +/- 1mm

-1 mm above or below the isoelectric line

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T-wave:

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Ventricular repolarization (Epi->Endocard.)

Morphology:

-rounded and asymmetrical with slower ascending slope and faster descending slope

-concordant as meaning with QRS

-positive

Duration: 0,13-0,3 s

Amplitude: less than 1/3 of the R wave

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QT-Interval:

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Meaning: Ventricular de-&repolarization

Duration: normal: ½ of RR(0,35-0,45 s)

-its values can be adjusted according to the heart rate (QTc), according to the Bazett formula:

QTc = QT/√RR (RR = 60/FC)

-the upper limit of the QTc interval is 0.45 sec

-prolonged QT interval is associated with an increased incidence of sudden cardiac death through ventricular tachyarrhythmias

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Q:

Limb Leads (frontal plane)?

A:

D1-D3 & aVL/aVR/avF

Q:

Precordial/Chest leads (transverse plane):

A:

V1-V6

Q:

Vertical Axis: Units

A:

1 small square= 1mm(0,1mV)

  1 large square= 5mm(o,5mV)

Q:

Horizontal axis:

A:

 1 small square= 0,04 sec 

 1 large square= 0,2 sec

  5 large squares= 1 sec

Q:

ECG Leads: (cardial areas) 

Lateral :

Anterior:

Septum: 
Apex: 

Inferior:

A:

Lateral L1; aVL; V5; V6

Anterior V1V2

Septum: V3
Apex: V4

Inferior L2; L3; aVF

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Q:

P-wave:

A:

Morphology:

-round, symmetrical

,-possibly notched/bifid (DII)

  -biphasic (+/) in V1

- positive in DI, DII and aVF

- negative in aVR

Duration: 0,06-0,10sec

Amplitude: maximum in DII (0,5-1,5mV)

Q:

PQ(PR) Interval: duration


A:


Duration: 0.12-0.20 sec, 

(-constant to repeated determinations

-->PQ interval variation in physiological respiratory arrhythmia 

Meaning = Atrioventricular conduction (P wave + PQ segment))

Q:

QRS complex:

A:



Duration: 0,08-0,1sec


Ventricular depolarization

Morphology: 

-depends on the position of the exploring electrode and the electrical position ofthe heart

-positive in most leads, mandatory negative in aVR, V1 and V2



Amplitude:

- R-wave in limb leads=5-14 mm

-R-wave in chest leads=10-25 mm

-the amplitude of the R wave increases progressively from V1->V6


Q:

Q-wave:


A:

Meaning

-mandatory missing in aVR, V1->V3

-there may be a larger Q wave in DIII that disappears at deep inspiration

Duration: <0,04 sec

Amplitude:< ¼ from R wave

Q:

ST-Segment:

A:

Last part of ventricular depolarization

Duration: 0,05-0,15 s

Position to the isoelectric line:

-it starts at J point ("junction"), located at the limit between S wave and ST-segment

-on the isoelectric line or +/- 1mm

-1 mm above or below the isoelectric line

Q:

T-wave:

A:

Ventricular repolarization (Epi->Endocard.)

Morphology:

-rounded and asymmetrical with slower ascending slope and faster descending slope

-concordant as meaning with QRS

-positive

Duration: 0,13-0,3 s

Amplitude: less than 1/3 of the R wave

Q:

QT-Interval:

A:

Meaning: Ventricular de-&repolarization

Duration: normal: ½ of RR(0,35-0,45 s)

-its values can be adjusted according to the heart rate (QTc), according to the Bazett formula:

QTc = QT/√RR (RR = 60/FC)

-the upper limit of the QTc interval is 0.45 sec

-prolonged QT interval is associated with an increased incidence of sudden cardiac death through ventricular tachyarrhythmias

ECG UMFT

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University of the Free State

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