Evaluation of myocardial glucose metabolism before and after recovery of myocardial function in patients with tachycardia-induced cardiomyopathy.
BACKGROUND
We assessed left ventricular (LV) function and myocardial glucose metabolism by fluoro-18-deoxyglucose (18F-FDG) positron emission tomography (PET) in patients with tachycardia-induced cardiomyopathy (TC).


METHODS
The subjects were 42 patients with heart disease, consisting of 7 patients with TC (61.4 +/- 19.0 years, LVEF 34.1%+/- 10.6%) and 35 with ischemic heart disease (IHD) (63.1 +/- 10.8 years, LVEF 49.9%+/- 13.5%). Five volunteers with normal ECG were the control group. All of the patients underwent 18F-FDG PET and echocardiography, and all of the patients with TC underwent 18F-FDG PET and echocardiography before and 6 months after antitachycardia therapy. Six patients underwent radiofrequency catheter ablation (RFCA) and 1 patient was medically treated with antitachycardia therapy. Myocardial glucose metabolism was assessed semiquantitatively by using the % dose uptake of 60 kg of BW (% dose uptake).


RESULTS
Mean % dose uptake of the control group was 5.52 +/- 0.54%. After antitachycardia therapy, LVEF significantly improved (34.1 +/- 10.6% vs 54.3 +/- 13.6%, P < 0.01), and % dose uptake also significantly improved (1.26 +/- 0.55% vs 1.49 +/- 0.62%, P < 0.05). Patients with IHD showed higher % dose uptake than those with TC before antitachycardia therapy (3.18 +/- 1.36 vs 1.26 +/- 0.55%, P < 0.01), controls showed higher value of % dose uptake than TC before antitachycardia therapy (5.52 +/- 0.54% vs 1.26 +/- 0.55%, P < 0.01).


CONCLUSIONS
Semiquantitative analysis of 18F-FDG PET showed that antitachycardia therapy improved myocardial glucose metabolism in patients with TC.
Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Kanazawa-ku, Yokohama, Japan. birth-45@fukuhp.yokohama-cu.ac.jp
Katsumi
K
Matsumoto
Nobukazu
N
Takahashi
Toshiyuki
T
Ishikawa
Shinichi
S
Sumita
Kohei
K
Matsushita
Noriko
N
Inoue
Tsukasa
T
Kobayashi
Kazuaki
K
Uchino
Kazuo
K
Kimura
Tomio
T
Inoue
Satoshi
S
Umemura
D009202:Cardiomyopathies / Q000000981:diagnostic imaging* / Q000209:etiology / Q000378:metabolism*; D016022:Case-Control Studies; D017115:Catheter Ablation; D004452:Echocardiography; D004562:Electrocardiography; D005260:Female; D019788:Fluorodeoxyglucose F18; D005947:Glucose / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009206:Myocardium / Q000378:metabolism*; D049268:Positron-Emission Tomography / Q000379:methods*; D019275:Radiopharmaceuticals; D020127:Recovery of Function; D013610:Tachycardia / Q000150:complications* / Q000000981:diagnostic imaging* / Q000601:surgery; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging* / Q000378:metabolism*
D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18; D005947:Glucose