EKG Ch. 7-8 Test

The rhythm this figure is:

• sinus tachycardia.
• sinus rhythm.
• sinus bradycardia.
• sinus arrhythmia.

Which of the following is TRUE about sinus rhythm?

• It is regular.
• It has an irregularly irregular pattern of QRS complexes.
• It has multiple shapes of P waves.
• It has wide QRS complexes without preceding P waves.

Sinus arrhythmia is

• a regular rhythm.
• an irregular rhythm.
• a rhythm that originates in the atria.
• a rhythm that originates in the AV junction.

The heart rate in this figure is closest to

• 170
• 150
• 140
• 100

The rhythm in this figure is

• sinus rhythm.
• sinus bradycardia.
• sinus rhythm with sinus arrest.
• sinus tachycardia.

PR interval in this figure is closest to

• 0.16 seconds.
• 0.28 seconds.
• 0.04 seconds.
• 0.40 seconds.

QRS interval in this figure is closest to

• 0.42 seconds.
• 0.08 seconds.
• 0.28 seconds.
• 0.30 seconds.

The T wave in this figure is

• inverted.
• upright.
• indicative of sinus control of the ventricles.
• indicative of ventricular depolarization.

Sinus rhythms all have

• uniform shape P waves preceding the QRS complexes.
• multiple shapes of P waves preceding the QRS complexes.
• a wavy baseline without P waves or QRS complexes.
• inverted P waves in Lead II.

In sinus block

• the pause is a multiple of the R-R intervals.
• there are P waves inside the pause.
• all R-R intervals are constant.
• the heart rate varies from 100 to 160.