Para-[18F]fluorobenzylguanidine kinetics in a canine coronary artery occlusion model.

Abstract

BACKGROUND:

The kinetics of para-[18F]fluorobenzylguanidine ([18F]PFBG) were investigated in a canine coronary artery occlusion model.

METHODS AND RESULTS:

Five dogs were imaged by positron emission tomography (PET) before and after complete surgical ligation of the left anterior descending coronary artery. PET studies included a 10-minute dynamic [13N]NH3 perfusion scan, followed 1 hour later by 3-hour dynamic [18F]PFBG scanning. [18F]PFBG and [13N]NH3 images demonstrated homogeneous myocardial uptake/perfusion before infarction. One hundred eighty minutes after [18F]PFBG administration, myocardial accumulation was decreased by 60% (day 2, 0.0065% +/- 0.0015% injected dose/ml) and 58% (day 16, 0.0069% +/- 0.003% injected dose/ml) compared with a similar myocardial region of interest from the preinfarction (0.016% +/- 0.005% injected dose/ml) study. Myocardial accumulation of [13N]NH3 at 9 minutes showed a 52% (day 2) and 7% (day 16) decrease compared with the preinfarction study. The accumulation of [18F]PFBG in the infarction was decreased significantly at 120 and 180 minutes on all postinfarction studies (p = 0.01). In three dogs a significant decrease in the myocardial norepinephrine concentration was documented in the area of infarction (237 +/- 94 ng/gm) versus the noninfarcted (1018 +/- 48 ng/gm) myocardium (p = 0.001).

CONCLUSIONS:

A decreased accumulation of [18F]PFBG was observed in the area of myocardial infarct in this canine model. The magnitude of the decrease in [18F]PFBG was larger than that seen with [13N]NH3 on day 16 after infarction, suggesting reperfusion and persistent sympathetic neuronal dysfunction.

• Authors: C R Berry, P K Garg, T R DeGrado, P Hellyer, W Weber, S Garg, B Hansen, M R Zalutsky, R E Coleman
• Journal: Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology (J Nucl Cardiol) 1996 Mar-Apr Vol. 3 Issue 2 Pg. 119-29 ISSN: 1071-3581 [Print] United States
• PMID: 8799237 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)

Chemical References

• 4-fluorobenzylguanidine
• Fluorobenzenes
• Guanidines

Topics

• Animals
• Coronary Disease (diagnostic imaging)
• Dogs
• Fluorobenzenes (pharmacokinetics)
• Guanidines (pharmacokinetics)
• Heart (diagnostic imaging)
• Myocardium (metabolism)
• Tomography, Emission-Computed