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. 2016 May 18:12:11-14.
doi: 10.1016/j.ijcha.2016.05.014. eCollection 2016 Sep.

Effect of intravenous infusion of iodinated contrast media on the coronary blood flow in dogs

Thura T Abd  1 , Asim I Shafique  2 , Hayder S Yasir  3 , Jung-Hee Seo  4 , Richard T George  1 , Rajat Mittal  4 , Albert C Lardo  1
Affiliations

Effect of intravenous infusion of iodinated contrast media on the coronary blood flow in dogs

Thura T Abd et al. Int J Cardiol Heart Vasc. .

Abstract

Background: Coronary computed tomography angiography (CCTA) is obtained using peripheral intravenous iodinated contrast agents (ICA) injection. There is continuing attempts to derive coronary physiological information like coronary blood flow (CBF) and/or fractional flow reserve from CCTA images. However, no data is available regarding the effect of peripheral intravenous injection of ICA on CBF.

Methods: A series of 4 experiments was performed using healthy mongrel dogs. All dogs underwent anesthesia and open thoracotomy with placement of ultrasound flowmeter to one of the coronary artery to provide real time absolute CBF measurements. Different infusion protocols of Isovue-370 and Visipaque-320 were injected into a peripheral vein. Similar doses of normal saline injection were performed to be used as controls. The effect of iodinated contrast media injection on absolute coronary blood flow was monitored and recorded.

Results: Injection of normal saline in the peripheral vein did not produce any significant increase in CBF. Peripheral intravenous injection of ICA resulted in a consistent increase of 40-73% in absolute CBF as recorded 5 minutes post-contrast administration. The contrast effect starts about 30 seconds and peaks at about 2 minutepost-contrast injection then slowly fades away in the following 10-15 min. The increase in the CBF was dose related. There was greater increase in the CBF to 50 ml infusion compared to 25 ml infusion of both Visipaque and Isovue.

Conclusions: Peripheral venous administration of iodinated contrast-media in dogs results in a dose related, significant and prolonged increase in CBF.

Keywords: Canine; Coronary flow; Dogs; Intravenous; Iodixanol; Iopamidol; Isovue; Visipaque.

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Figures

Fig. 1
Fig. 1
Shows graphical representation of the effect of different doses of intravenous injection of Isovue and Visipaque on coronary flow over time in the left circumflex artery from dog experiment #4. X axis is time in seconds; Y axis is percentage change of blood flow compared to baseline.
Fig. 2
Fig. 2
Left circumflex blood flow in dog #3 in response to every 10 min of intravenous injection of 25 cm3 of Visipaque for a total of 3 injections. X axis in minutes. Y axis is flow in ml/min. There is a cumulative increase in coronary flow with multiple sequential injection of contrast. X axis is time in minutes with zero time is the time of the first scan. Y axis is the flow as detected by the ultrasound flow meter measured in ml/min.
Fig. 3
Fig. 3
Left circumflex blood flow in dog #4 in response to every 5 minute injection of 25 cm3 of Isovue for a total of 3 injections. There is a cumulative positive response of increased blood flow with each injection. X axis is time in minutes. Y axis is absolute coronary flow in the LCx artery.
See this image and copyright information in PMC

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