Document Detail

Intravenous pentoxifylline does not affect the exercise-induced pulmonary arterial, capillary or venous hypertension in Thoroughbred horses.
MedLine Citation:
PMID:  11107006     Owner:  NLM     Status:  MEDLINE    
The present study was carried out to examine whether intravenously administered pentoxifylline-a phosphodiesterase inhibitor which increases red blood cell deformability and decreases blood viscosity-would attenuate the magnitude of exercise-induced pulmonary capillary hypertension in healthy, fit Thoroughbred horses and in turn, diminish the occurrence of exercise-induced pulmonary hemorrhage (EIPH). Experiments were carried out on six healthy, sound, exercise-trained Thoroughbred horses. Hemodynamic data were collected at rest, and during exercise performed at 8 and 14 m/sec on 3.5% uphill grade in the control (no medications) and the pentoxifylline (8.5 mg/kg, i.v.) experiments. The sequence of treatments was randomized for every horse and 7 days were allowed between treatments. Galloping at 14 m/sec on 3.5% uphill grade elicited maximal heart rate. In both treatments, simultaneous measurements of phasic and mean right atrial and pulmonary arterial, capillary and wedge pressures were made using catheter-tip-manometers whose signals were carefully referenced at the point of the left shoulder. In the control study, exercise resulted in progressive significant increments in heart rate, right atrial and pulmonary arterial, capillary and venous pressures; thereby, confirming that exercising Thoroughbreds develop significant pulmonary hypertension. All horses experienced exercise-induced pulmonary hemorrhage (EIPH) in the control experiments. Pentoxifylline administration to standing horses caused anxiety, tachycardia, muscular fasciculations/tremors and mild sweating, but statistically significant changes in right atrial and pulmonary arterial, capillary and venous pressures were not detected. Exercise in the pentoxifylline treatment also resulted in progressive significant increments in heart rate and right atrial as well as pulmonary vascular pressures, but these data were not statistically significantly different from those in the control study and the incidence of EIPH remained unchanged. Thus, it was concluded that i.v. pentoxifylline is ineffective in attenuating the exercise-induced pulmonary arterial, capillary and venous hypertension in healthy, fit Thoroughbred horses.
M Manohar; T E Goetz; P Rothenbaum; S Humphrey
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of veterinary pharmacology and therapeutics     Volume:  23     ISSN:  0140-7783     ISO Abbreviation:  J. Vet. Pharmacol. Ther.     Publication Date:  2000 Oct 
Date Detail:
Created Date:  2000-12-27     Completed Date:  2001-03-08     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7910920     Medline TA:  J Vet Pharmacol Ther     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  317-22     Citation Subset:  IM    
Departments of Veterinary Biosciences and Clinical Medicine, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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MeSH Terms
Hemodynamics / drug effects
Horse Diseases / etiology,  physiopathology,  prevention & control*
Hypertension, Pulmonary / etiology,  prevention & control,  veterinary*
Injections, Intravenous / veterinary
Pentoxifylline / administration & dosage,  therapeutic use*
Phosphodiesterase Inhibitors / administration & dosage,  therapeutic use*
Physical Conditioning, Animal / adverse effects*
Random Allocation
Reg. No./Substance:
0/Phosphodiesterase Inhibitors; 6493-05-6/Pentoxifylline

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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