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  • Title: Effect of anesthesia on cardiovascular and renal function in the newborn piglet.
    Author: Bailie MD, Alward CT, Sawyer DC, Hook JB.
    Journal: J Pharmacol Exp Ther; 1979 Feb; 208(2):298-302. PubMed ID: 762663.
    Abstract:
    The effects of anesthetic agents, nitrous oxide-oxygen, nitrous oxide-oxygen plus ketamine, pentobarbital sodium and halothane, were determined in piglets 6 to 76 hr of age. After observations of cardiovascular and renal function in the unanesthetized state, the drugs were administered and observations were repeated in the anesthetized state. All of the anesthetics caused a decrease in cardiac output and an increase in total peripheral resistance in the newborn piglet. Both nitrous oxide-oxygen plus ketamine and halothane produced a decrease in heart rate while pentobarbital caused an increase and halothane a decrease in systemic blood pressure. Changes in renal function were minimal. Changes in renal blood flow were inconsistent and renal vascular resistance was not modified by any of the drugs. There was little evidence of redistribution of intrarenal blood flow and no significant changes in glomerular filtration rate or sodium excretion. Plasma renin concentration increased after halothane. It was concluded that changes in renal and cardiovascular function due to anesthesia in the newborn were small. Differences between newborn and adult animals may be related to several factors including the state of development of the autonomic nervous system and species differences used in different studies.
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