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Ann Thorac Surg 2004;78:167-172
© 2004 The Society of Thoracic Surgeons

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Original article: cardiovascular

Instant myocardial blood flow monitor: its calibration and assessment of flow capacity of the intracoronary shunt tube

^a Department of General and Cardiothoracic Surgery, Kanazawa University School of Medicine, Kanazawa, Japan

Accepted for publication December 10, 2003.

^* Address reprint requests to Dr Kamiya, Department of General and Cardiothoracic Surgery, Kanazawa University School of Medicine, Takaramachi 13-1, Kanazawa 920-8641, Japan
e-mail: h.kamiya{at}triton.ocn.ne.jp

BACKGROUND: We developed a new instant regional myocardial blood flow (RMBF) monitor utilizing the thermal diffusion method in which the RMBF value is presented as the value inversely proportional to the thermocouple voltage output (1/V). The purposes of this study were (1) to validate the accuracy of RMBF measurement by the instant RMBF monitor in comparison with the colored microsphere method for calibration; (2) to investigate influences of it on the RMBF; and (3) to assess changes in RMBF caused by the shunt tube insertion.

METHODS: Twenty pigs were used for this study: 4 for comparison between the instant RMBF meter and the colored microsphere method, 4 for validation of reproducibility, and 6 for measurement of RMBF during shunt tube.

RESULTS: The relation between RMBF values obtained by the colored microsphere method and 1/V values by instant RMBF monitor was colored microsphere = 140,992 (1/V) – 231 in epicardial layer (R² = 0.819) and colored microsphere = 111,381 (1/V) – 165 in endocardial layer (R² = 0.693). The correlation coefficient and R² values between RMBF values measured by both methods were 0.985 and 0.839 in epicardial layer, and 0.963 and 0.679 in endocardial layer, respectively. The RMBF at each layer did not change after the attachment of the monitor. Fifteen minutes after shunt tube insertion, RMBF measured by the colored microsphere method decreased to 31.1% (p = 0.0001) and 33.7% (p = 0.0001) in epicardium and endocardium, respectively, and no difference was observed from the value measured by the instant RMBF monitor.

CONCLUSIONS: This instant RMBF monitor can provide instantaneous and continuous information of RMBF without requiring tissue examination.

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