ELECTROCARDIOGRAM AND CRITICAL POINTS OF ECG

Elektrokardiogram

EKG is abbreviated from the German

Elektrocardiogram

Is a graphic produced by and electrodiagraph, which records the electrical activity of the heart over time.

P wave

QRS complex and

T wave. A small U wave is normally visible in 50 to 75% of ECGs.

A typical ECG tracing of a normal heartbeat (or cardiac cycle) consists of:

U: 50 to 75%

A small ___wave is normally visible in _____ of ECGs.

P wave

This wave is triggered when the atrium is irritated and is hence depolarized (Atrial depolarization)

sino-atrial node: pacemaker

P wave is formed as impulse originating in the____or____pass through the atrial tissues.

P waves

QRS

The relationship between ____and ___complexes helps distinguish various cardiac arrhythmias.

atrial enlargement

The shape and duration of the P waves may indicate ____

QRS Complex

This is Ventricular depolarization

depolarization

The QRS complex is a structure on the ECG that corresponds to the _____ of the ventricles.

diagnosing cardiac arrhythmias

conduction abnormalities

ventricular hypertrophy

myocardial infarction

electrolyte derangements, and other disease states.

The duration, amplitude, and morphology of the QRS complex is useful in?

T wave

Represents the repolarization (or recovery) of the ventricles

P-R interval: AV node

P wave: QRS complex

120 to 200 ms long

The critical point of the ECG are as follows:

____ → reflects the normal delay of the conduction at the ____. It measured from the beginning of the ____ to the beginning of the ____. It is usually ____.

Q-T interval

The critical point of the ECG are as follows:

_____→ reflects the critical timing of repolarization of the ventricles. from contraction to relaxation

S-T interval

ST segment (flat)

The critical point of the ECG are as follows:

____→ reflects important information about the repolarization of the ventricles. ____ elevation may indicate myocardial infarction.