| phasic a. |
a form of sinus arrhythmia linked to the phases of respiration, the heart rate increasing with inhalation and decreasing with exhalation. Cf. nonphasic a. Click here to view image■Phasic arrhythmia, sinus arrhythmia linked to respiration, in a child four years of age. The P–R interval is constant, but the R–R interval shortens with inspiration and lengthens with expiration.
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| phasic r. |
coordinated r.
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