Simple and accurate assessment of forward cardiac output by use of 1-(11)C-acetate PET verified in a pig model.
Dynamic 1-(11)C-acetate PET (AC-PET) allows quantification of myocardial blood flow and oxidative metabolism. We wanted to determine the accuracy of AC-PET in measuring cardiac output (CO) using first-pass analysis and the indicator dilution principle. Further, we wanted to investigate the pulmonary uptake of acetate in relation to left atrial filling pressures and ventricular function.


METHODS
Twenty-four steady-state experiments were performed in 5 domestic pigs. Pulmonary capillary wedge pressure (PCWP) and CO by thermodilution (CO(thermo)) were recorded invasively simultaneous with AC-PET scans at baseline (n = 9), dobutamine infusion (n = 6), high-dose metoprolol and morphine (n = 6), and angiotensinamide infusion (n = 3). 1-(11)C-Acetate was injected as a rapid manual bolus. Regions of interest (ROIs) were placed in the right (RV) and left (LV) heart cavities. Time-activity curves were constructed and the area under the curve (AUC) was integrated from beginning the scan to the time of visually determined recirculation by simple arithmetic. CO by PET (CO(PET)) was calculated as injected dose/AUC. Image handling and curve analysis were repeated by a blinded observer. Total pulmonary extravascular retention of (11)C, expressed as percentage of injected dose (lung-uptake %ID), was measured using a combination of transmission, (15)O-carbon monoxide, and AC-PET scans.


RESULTS
CO(thermo) ranged from 2.1 to 8.2 L/min. CO(PET) determined from both LV and RV was linearly related to CO(thermo) with slopes close to 1 (LV, r = 0.98; RV, r = 0.96; both P < 0.001). Interobserver reproducibility was r = 0.98, P < 0.001. The PCWP range was 6-14 mm Hg and the lung-uptake %ID was 2.7-8.5 %ID. When normalized to baseline, lung-uptake %ID was correlated with PCWP (r = 0.56, P = 0.01) and linearly correlated with LV input resistance (PCWP divided by CO(thermo); r = 0.91, P < 0.001). When both lung-uptake %ID and stroke volume were normalized to baseline, a piecewise linear relation was found (r = 0.95, P < 0.001).


CONCLUSIONS
Our results suggest that measurements of CO by AC-PET are feasible and accurate. Using RV ROIs might favor CO measurements by any injectable PET tracer. The lung-uptake %ID might be useful in evaluation of pulmonary congestion, but further studies are needed.
Sörensen
Jens
J
Department of Medical Sciences, Academic Hospital, Uppsala, Sweden. jens.sorensen@pet.uu.se
Ståhle
Elisabeth
E
Långström
Bengt
B
Frostfeldt
Gunnar
G
Wikström
Gerhard
G
Hedenstierna
Göran
G
D000085:Acetates / Q000493:pharmacokinetics; D000818:Animals; D002244:Carbon / Q000493:pharmacokinetics; D002302:Cardiac Output / Q000502:physiology*; D006352:Heart Ventricles / Q000000981:diagnostic imaging* / Q000378:metabolism; D007201:Indicator Dilution Techniques; D008168:Lung / Q000000981:diagnostic imaging / Q000378:metabolism; D008657:Metabolic Clearance Rate; D015588:Observer Variation; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013552:Swine; D014055:Tomography, Emission-Computed / Q000379:methods*; D016276:Ventricular Function
D000085:Acetates; D019275:Radiopharmaceuticals; C438206:carbon-11 acetate; D002244:Carbon