Abstract:
:The synthetic catecholamine isoprenaline (ISO) has been used as an inductor in the acute myocardial infarction model for more than a half century. Despite the fact that many articles were published on this topic, precise early haemodynamic pathology remains unknown. Acute haemodynamic changes were measured in rats; first, in preliminary experiments by the thermodilution method; and second, in main experiments continuously for 2 h using a Millar catheter. Animals received saline or ISO in the cardiotoxic dose (100 mg/kg, subcutaneously). Also, additional experiments were performed with salbutamol in order to evaluate the role of β(2)-receptors. ISO caused a rapid, within 1 min, approximately 40% decrease in arterial blood pressures, 30% increase in the heart rate, and 30% decrease in the stroke volume. Within the first 2 min, the changes were followed by decreases in afterload (-40%), preload (-10%), diastolic relaxation (-50%), diastolic filling (-40%), and a marked, but short-term, increase in the left ventricle contractility (+100%). Ejection fraction did not significantly change, suggesting diastolic dysfunction. Salbutamol, with the exception of diastolic pressure and afterload, did not substantially influence other parameters. In conclusion, this study demonstrated that diastolic dysfunction precedes systolic dysfunction and β(2)-receptor stimulation alone is not sufficient for an early induction of diastolic dysfunction.
journal_name
Hum Exp Toxicoljournal_title
Human & experimental toxicologyauthors
Filipský T,Zatloukalová L,Mladěnka P,Hrdina Rdoi
10.1177/0960327112438927subject
Has Abstractpub_date
2012-08-01 00:00:00pages
830-43issue
8eissn
0960-3271issn
1477-0903pii
0960327112438927journal_volume
31pub_type
杂志文章abstract::This study was designed to evaluate the hepato and neuroprotective activity of Daflon and low-dose γ radiation on thioacetamide (TAA)-induced liver damage and hepatic encephalopathy (HE) in rats. Effect of daily Daflon treatment (100 mg/kg body weight, Per OS (p.o.) for consecutive 3 days) and/or fractionated low-dose...
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