QRS Complexes Quiz

You have determined the heart rate and regularity and examined the P waves. The next logical step of analyzing an EKG rhythm is to:

• determine the QT interval.

• evaluate the QRS complexes.

• examine the T waves.

• examine the ST segments.

The normal QRS complex:

• occurs before the PR interval.

• has an amplitude of 5 to 15 mm.

• consists of 2 waveforms.

• has a duration of 0.06 to 0.10 seconds.

The Q wave is:

• the first negative deflection following the P wave.

• a negative deflection following the R wave.

• normally absent.

• sometimes upright.

Tags

NGSS.HS-PS2-5

The R wave:

• precedes the Q wave.

• is the first positive deflection in the QRS complex.

• is the first negative deflection that extends below the baseline.

• is less than 25% of the amplitude of the S wave in that lead.

The S wave in the QRS complex is:

• the negative deflection that follows the R wave and extends below the baseline

• sometime absent.

• triangular shaped.

• normally 0.04 seconds in duration and has an amplitude of 5 to 30 mm.

The point at which the QRS complex meets the ST segment is called the:

• QT junction.

• ST interval.

• J point.

• RS point.

In which of the following will the QRS complex have higher amplitude?

• The elderly.

• In women.

• The precordial leads.

• When there is fluid in the pericardial sac.

In leads I, II, III, aVL, aVF, and V4 to V6, the deflection of the QRS complex is characteristically:

• upright

• biphasic

• inverted

• biphasic or inverted

Normal QRS complexes are those that:

• look different.

• are inverted.

• are upright and narrow.

• are wide and bizarre.

The QRS complexes should appear normal if:

• the rhythm is initiated from the SA node, atria, or AV junction.

• conduction is delayed as the impulse progresses from the bundle of His, through the right and left bundle branches, and through the Purkinje network.

• it originates from the ventricles.

• there is a conduction delay through the ventricles.