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Begin ritodrine infusion at 50 mcg/min(0.05mg/min)
-
Increase by 50 mcg/min every 20 minutes
-
Maximum dose: 350 mcg/min
-
If contractions less frequent than every
10 minutes, wait another 20 minutes before increasing the dose
-
Once labor is stopped, maintain infusion
rate for 1 hour;then reduce every 20 minutes to the lowest rate that inhibits
contractions adequately
-
Continue this maintenance rate for 12
hours
-
Discontinue or decrease dosage for maternal
pulse >150 BPM,FHR>200 BPM,> 6 maternal or fetal PVCs/min,SBP> 180 mm Hg,
DBP< 40 mm Hg.
-
Cardiac monitor. Serum K+ and glucose
q 4 hr.
REF:Caritis S et al.:Pharmacodynamics
of ritodrine in pregnant women during preterm labor.Am J Obstet Gynecol
147:752,1983
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