Abstract:
INTRODUCTION:Pulmonary hypertension (PH) is a potentially deadly disease for infants and adults with few existing medical interventions and no cure. In PH, increased blood pressure in the pulmonary artery eventually leads to heart failure. Fasudil, an antagonist of Rho-kinase, causes vasodilation leading to decreased systemic artery pressure and pulmonary artery pressure (PAP). This study compared the effects of fasudil administered as either an intravenous infusion or inhaled aerosol in newborn lambs. HYPOTHESIS:Inhaled aerosol delivery of fasudil will provide selective pulmonary vasodilation when compared with intravenous administration. METHODS:Newborn lambs (∼11 days) were surgically instrumented and mechanically ventilated under anesthesia. A pulmonary artery catheter and ultrasonic flow probe were inserted to measure hemodynamics. Acute PH was pharmaceutically induced via continuous intravenous infusion of thromboxane. After achieving a 2- to 3-fold elevation of PAP, fasudil was administered either as intravenous infusion (2.5 mg/kg) or inhaled aerosol (100 mg of fasudil in 2 mL of saline). Changes in PAP, mean systemic arterial pressure (MABP), pulmonary vascular resistance (PVR), systemic vascular resistance (SVR), cardiac output, and heart rate were assessed. In addition, plasma concentrations of fasudil were measured. RESULTS:Both routes of fasudil delivery produced significant decreases in PAP and PVR but also produced similar decreases in MABP and SVR. The Cmax for intravenous fasudil was greater than that for inhaled fasudil. CONCLUSIONS:These results suggest inhaled fasudil lacks pulmonary selectivity when compared with intravenous fasudil.
journal_name
J Cardiovasc Pharmacol Therjournal_title
Journal of cardiovascular pharmacology and therapeuticsauthors
Hanson SFL,Terry MH,Moretta DT,Power GG,Wilson SM,Alam F,Ahsan F,Blood AB,Giri PCdoi
10.1177/1074248418772814subject
Has Abstractpub_date
2018-09-01 00:00:00pages
472-480issue
5eissn
1074-2484issn
1940-4034journal_volume
23pub_type
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