The effect of alpha-adrenergic blockade on the pulmonary vascular response to dopamine in neonatal lambs.

Abstract:

:The effect of alpha-adrenergic blockade by phentolamine on the pulmonary vascular response to dopamine was studied in chronically prepared newborn lambs. Dopamine was administered at doses of 2.7 micrograms . kg-1 . min-1, 27 micrograms . kg-1 . min-1 and 270 micrograms . kg-1 . min-1 with and without alpha-adrenergic blockade. Dopamine infusion at 270 micrograms . kg-1 . min-1 caused a rise in the mean pulmonary artery pressure from 22 +/- 3.2 mmHg (mean +/- S.E.) at baseline to 36 +/- 4.1 mmHg (P less than 0.001). This rise was unaffected by alpha-adrenergic blockade. Dopamine infusion alone did not change pulmonary blood flow, but, in the presence of alpha-adrenergic blockade, pulmonary blood flow rose from 190 +/- 12 ml . min-1 . kg-1 at baseline to 280 +/- 13 ml . min-1 . kg-1 at the maximum dopamine infusion rate (P less than 0.001). Pulmonary vascular resistance was the same before and after alpha-adrenergic blockade and did not change from the baseline value during dopamine infusion.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Williams BJ,Drummond WH

doi

10.1203/00006450-198306000-00007

subject

Has Abstract

pub_date

1983-06-01 00:00:00

pages

464-7

issue

6

eissn

0031-3998

issn

1530-0447

journal_volume

17

pub_type

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