Abstract | OBJECTIVE: To determine the effects of a continuous epinephrine infusion on renal and mesenteric blood flow in both healthy newborn piglets and animals subjected to hemorrhagic shock. METHODS: Superior mesenteric artery (SMA) and left renal artery ultrasonic flow probes were implanted into 16 1- to 3-day-old piglets. Two days later, the effects of epinephrine on SMA and renal blood flow, mean arterial pressure (MAP) and central venous pressure were measured in conscious, non-sedated normovolemic piglets. Epinephrine doses of 0.2, 0.4, 0.8, 1.6 and 3.2 microg/kg.min were used in random order. Piglets were subsequently hemorrhaged (20 ml/kg) to mild hypotension and again received epinephrine infusion in the same doses. RESULTS: Doses of epinephrine less than 3.2 microg/kg.min had no significant effects on renal or mesenteric arterial flow. At 3.2 microg/kg.min of epinephrine during normovolemia, there was a significant decrease in SMA blood flow (34% [SD 42], p < 0.05) and increase in SMA vascular resistance (147% [SD 114], p < 0.05). Similar results were shown during hypovolemia, SMA flow decreased by 32% (SD 33), and SMA vascular resistance increased by 220.3% (SD 177). At 3.2 microg/kg.min renal artery flow decreased by 43% (SD 21) during normovolemia and a similar decrease occurred during hypovolemia, 37% ( SD 31). Renal vascular resistance increased by about 200% at this dose (normovolemia 211% [SD 185], hypovolemia 186% [SD 150], p < 0.01). Low-to-moderate dose epinephrine caused no significant change in SMA or renal blood flow. During hypovolemia low dose epinephrine infusion was associated with a trend to increased SMA blood flow. CONCLUSION:
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Authors | D L Bigam, K J Barrington, D W Jirsch, P Y Cheung |
Journal | Biology of the neonate
(Biol Neonate)
Vol. 73
Issue 3
Pg. 198-206
( 1998)
ISSN: 0006-3126 [Print] Switzerland |
PMID | 9535538
(Publication Type: Journal Article)
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Chemical References |
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Topics |
- Animals
- Animals, Newborn
(physiology)
- Blood Flow Velocity
(drug effects)
- Blood Pressure
(drug effects)
- Blood Volume
- Epinephrine
(administration & dosage, pharmacology)
- Mesenteric Arteries
(drug effects, physiology)
- Renal Artery
(drug effects, physiology)
- Swine
- Vascular Resistance
(drug effects)
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