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- W2364884046 abstract "Objective To evaluate the effects of left ventricular contractility on the changes of average image intensity(AII) of the myocardial integrated backscatter(IBS) and cyclic variation in IBS(CVIB).Methods Seven adult mongrel dogs were chosen to be studied.The curves of myocardial IBS of several cardiac cycle were acquired to calibrate the magnitude of AII and CVIB before and after dobutamine or propranolol infusion.Results Dobutamine or propranolol did not affect the magnitude of AII (P 0.05 ) of the IBS.However,dobutamine produced a significant increase in the magnitude of CVIB(basal septum: 9.5 ± 0.6 vs 6.8 ± 0.3 ,P 0.001 ;posterio wall: 10.9 ± 0.7 vs 8.5± 0.3 ,P 0.001 ) and propranolol significantly decrease the magnitude of CVIB(basal septum: 5.2 ± 0.3 vs 7.1± 0.2 ,P 0.001 ;posterio wall: 6.3 ± 0.6 vs 8.6 ± 0.3 ,P 0.001 ).Conclusions The changes of the magnitude of AII and CVIB have been demonstrated to reflect different physiological and pathological changes respectively.The contractility alteration can not affect the magnitude of AII,but can produce significant change in CVIB.The increase of left ventricular contractility results in a significant rise of the magnitude of CVIB and the decrease of left ventricular contractility results in a significant fall of the magnitude of CVIB.The correlation between the contractility and the magnitude of CVIB was demonstrated." @default.
- W2364884046 created "2016-06-24" @default.
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- W2364884046 date "2002-01-01" @default.
- W2364884046 modified "2023-09-24" @default.
- W2364884046 title "Influence of contractility on myocardial ultrasonic integrated backscatter and its cyclic variation" @default.
- W2364884046 hasPublicationYear "2002" @default.
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