ECGs made easy, 7th edition, Chapter 6 highlights & class
notes
if the ventricles function as the heart's pacemaker, they typically generate impulses at a rate of
___________ beats/min. - (correct Answer) - 20 to 40
what are the characteristics of premature ventricular complexes (PVCs)? - (correct Answer) - rhythm:
irregular because of early beats; if it is interpolated, the rhythm will be regular
rate: 20 to 40 bpm
P-waves: usually absent or with retrograde conduction to the atria.
PR interval: none because the ectopic beat originates in the ventricles.
QRS duration: 0.12 seconds or greater; T wave is usually in the opposite direction of the QRS complex.
(not the exact picture from the textbook)
what is a fusion beat? - (correct Answer) - a result of an electrical impulse from a supraventricular site
(SA node) discharging at the same time as an ectopic site in the ventricles.
sinus bradycardia at 80 beats/min with ventricular bigeminy - (correct Answer) - identify this rhythm:
what are uniform PVCs? - (correct Answer) - premature ventricular beats that look the same in the same
lead and originate from the same anatomical site (focus)
escape beats are - (correct Answer) - late
a ventricular escape beat is a protective mechanism, safeguarding the heart from more extreme slowing
or even _________. - (correct Answer) - asystole
what are the characteristics of ventricular escape beats? - (correct Answer) - rhythm: irregular because
of late beats; the ventricular escape beat occurs after the next expected beat of the underlying rhythm.
rate: 20 to 40
P-waves: usually absent or, with retrograde conduction to the atria, may appear after the QRS (usually
upright in the ST segment or T wave).
PR interval: none
QRS duration: 0.12 secs or greater; the T wave is frequently in the opposite direction of the QRS
complex.
(located at 4)
ventricular escape rhythm (IVR) (idioventricular rhythm)) - (correct Answer) - exists when three or more
notes
if the ventricles function as the heart's pacemaker, they typically generate impulses at a rate of
___________ beats/min. - (correct Answer) - 20 to 40
what are the characteristics of premature ventricular complexes (PVCs)? - (correct Answer) - rhythm:
irregular because of early beats; if it is interpolated, the rhythm will be regular
rate: 20 to 40 bpm
P-waves: usually absent or with retrograde conduction to the atria.
PR interval: none because the ectopic beat originates in the ventricles.
QRS duration: 0.12 seconds or greater; T wave is usually in the opposite direction of the QRS complex.
(not the exact picture from the textbook)
what is a fusion beat? - (correct Answer) - a result of an electrical impulse from a supraventricular site
(SA node) discharging at the same time as an ectopic site in the ventricles.
sinus bradycardia at 80 beats/min with ventricular bigeminy - (correct Answer) - identify this rhythm:
what are uniform PVCs? - (correct Answer) - premature ventricular beats that look the same in the same
lead and originate from the same anatomical site (focus)
escape beats are - (correct Answer) - late
a ventricular escape beat is a protective mechanism, safeguarding the heart from more extreme slowing
or even _________. - (correct Answer) - asystole
what are the characteristics of ventricular escape beats? - (correct Answer) - rhythm: irregular because
of late beats; the ventricular escape beat occurs after the next expected beat of the underlying rhythm.
rate: 20 to 40
P-waves: usually absent or, with retrograde conduction to the atria, may appear after the QRS (usually
upright in the ST segment or T wave).
PR interval: none
QRS duration: 0.12 secs or greater; the T wave is frequently in the opposite direction of the QRS
complex.
(located at 4)
ventricular escape rhythm (IVR) (idioventricular rhythm)) - (correct Answer) - exists when three or more
