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  • Title: Effect of aminophylline on diaphragmatic contractility in the piglet.
    Author: Mayock DE, Standaert TA, Watchko JF, Woodrum DE.
    Journal: Pediatr Res; 1990 Sep; 28(3):196-8. PubMed ID: 2235113.
    Abstract:
    Minute ventilation, arterial blood gases, arterial pH, cardiac output, and transdiaphragmatic force generation, both during spontaneous ventilation and in response to phrenic nerve stimulation during airway occlusion at end expiration, were measured in nine anesthetized, tracheostomized piglets before and 30 min after parenteral infusion of 20 mg/kg aminophylline. Serum theophylline levels averaged 109 +/- 21 mumol/L (19.7 +/- 3.7 micrograms/mL) at 30 min postinfusion. No significant changes were noted in pH, blood gases, blood pressure, or ventilatory measures after aminophylline. Aminophylline infusion also had no effect on transdiaphragmatic force generation at any frequency of phrenic nerve stimulation studied. It is concluded that aminophylline has no effect on diaphragmatic contractility in the quietly breathing, nonfatigued piglet.
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