A beat of atrial or nodal origin comes earlier than the next expected normal beat. A pause follows and then the rhythm resumes.
Sj may differ in intensity from the Sj of normal beats, and S2 may be decreased. Both sounds are otherwise similar to those of normal beats.
A beat of ventricular origin comes earlier than the next expected normal beat. A pause follows and the rhythm resumes.
Sj may differ in intensity from the Si of the normal beats, and S2 may be decreased. Both sounds are likely to be split.
The heart varies cyclically, usually speeding up with inspiration and slowing down with expiration.
Normal, although Sj may vary with the heart rate.
The ventricular rhythm is S^ varies in intensity.
totally irregular, although short runs of the irregular ventricular rhythm may seem regular.
TABLE 3-12 ■ Abnormalities in Rate and Rhythm of Breathing n
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