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OtherBrief Communications

Simple Analytic Method of 11C-Flumazenil Metabolite in Blood

Yasuhiro Magata, Takahiro Mukai, Masafumi Ihara, Sadahiko Nishizawa, Haruhiro Kitano, Koichi Ishizu, Hideo Saji and Junji Konishi
Journal of Nuclear Medicine March 2003, 44 (3) 417-421;
Yasuhiro Magata
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Takahiro Mukai
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Masafumi Ihara
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Sadahiko Nishizawa
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Haruhiro Kitano
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Koichi Ishizu
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Hideo Saji
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Junji Konishi
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  • FIGURE 1.
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    FIGURE 1.

    Correlation of percentage of unchanged 11C-FMZ fraction between TLC method and extraction method using plasma samples. Linear regression curve shows y = 0.99x + 0.18. Correlation efficient estimated by Pearson correlation analysis is 0.995.

  • FIGURE 2.
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    FIGURE 2.

    Typical time-activity curves after injection of 11C-FMZ. (A) Time-activity curve obtained using whole blood samples and extraction method. +, Radioactivity in whole blood samples (kBq/mL); ○, unmetabolized 11C-FMZ in whole blood samples (kBq/mL). (B) Time-activity curve obtained using plasma samples and extraction method. ×, Radioactivity in plasma samples (kBq/mL); ▵, unmetabolized 11C-FMZ in plasma samples (kBq/mL).

  • FIGURE 3.
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    FIGURE 3.

    Time course of percentage of unchanged 11C-FMZ fraction of all subjects. ○, Time course of percentage of unchanged 11C-FMZ fraction obtained from whole blood extraction method; ▵, time course of percentage of unchanged 11C-FMZ fraction obtained from plasma extraction method. Data are presented as mean ± SD.

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    TABLE 1

    Comparison of BP Values Using Whole Blood and Plasma and Differences Between BP Calculated Using Whole Blood and BP Calculated Using Plasma

    RegionBP value*BP value difference†
    Whole bloodPlasmaHealthy volunteer numberMean*,‡
    12345678910111213
    Frontal cortex8.87 ± 1.208.85 ± 1.14−2.351.150.040.560.46−0.631.02−0.040.361.410.46−0.13−0.100.67 ± 0.67
    Parietal cortex8.58 ± 1.128.56 ± 1.07−2.441.080.040.570.41−0.681.07−0.050.361.490.42−0.13−0.100.68 ± 0.69
    Temp. cortex9.51 ± 1.109.49 ± 1.04−2.541.120.020.660.44−0.751.04−0.070.361.790.47−0.13−0.090.73 ± 0.74
    Occip. cortex10.38 ± 1.3710.35 ± 1.31−2.441.620.050.500.42−0.640.88−0.040.401.300.50−0.14−0.090.69 ± 0.71
    Basal ganglia3.31 ± 0.603.30 ± 0.57−0.392.250.070.300.220.510.160.100.011.800.12−0.030.020.46 ± 0.71
    Thalamus5.01 ± 0.705.00 ± 0.68−0.811.060.170.120.200.030.31−0.030.070.820.01−0.04−0.010.28 ± 0.37
    Cerebellum6.00 ± 0.855.99 ± 0.83−1.660.750.100.360.29−0.190.60−0.030.160.980.15−0.07−0.060.41 ± 0.48
    Brain stem0.84 ± 0.330.84 ± 0.33−0.69−0.690.160.450.13−0.600.15−0.081.200.340.19−0.11−0.140.38 ± 0.33
    • ↵* Mean ± SD (n = 13).

    • ↵† Each value was calculated as follows: (BP [whole blood extraction method] − BP [plasma extraction method])/BP [plasma extraction method] × 100 (%).

    • ↵‡ Mean ± SD were calculated from each absolute value.

    • Temp. = temporal; Occip. = occipital.

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Journal of Nuclear Medicine
Vol. 44, Issue 3
March 1, 2003
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Simple Analytic Method of 11C-Flumazenil Metabolite in Blood
Yasuhiro Magata, Takahiro Mukai, Masafumi Ihara, Sadahiko Nishizawa, Haruhiro Kitano, Koichi Ishizu, Hideo Saji, Junji Konishi
Journal of Nuclear Medicine Mar 2003, 44 (3) 417-421;

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Simple Analytic Method of 11C-Flumazenil Metabolite in Blood
Yasuhiro Magata, Takahiro Mukai, Masafumi Ihara, Sadahiko Nishizawa, Haruhiro Kitano, Koichi Ishizu, Hideo Saji, Junji Konishi
Journal of Nuclear Medicine Mar 2003, 44 (3) 417-421;
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