BACKGROUND: 123I-metaiodobenzylguanidine (MIBG) myocardial scintigraphy is a useful tool for diagnosing cardiac autonomic neuropathy (CAN) in non-insulin-dependent diabetes mellitus (NIDDM). However, the long-term prognostic value for cardiac events or mortality in NIDDM has not been clarified. METHODS AND RESULTS: We investigated the long-term prognostic value of cardiac MIBG imaging for both cardiac event and mortality owing to a variety of causes of death in NIDDM. 144 NIDDM patients were analyzed retrospectively with the end-points of a cardiac event and various causes of mortality. The heart-to-mediastinum uptake ratio on the delayed image (H/M [d]) was obtained from anterior planar imaging. The mean follow-up period was 7.2+/-3.2 years. Seventeen patients had a cardiac event onset and 7 patients died during observation. During the same observation course, 16 patients died, including some who died of cardiac event. Both multivariate and univariate analyses revealed that decreased H/M (d) (<1.7) was the independent predictor of long-term mortality for a variety of causes of death. Although the value of H/M (d) was not a significant prognostic factor for predicting a cardiac event, CAN, diagnosed by a combination of H/M (d) and coefficient variance of RR interval, was an independent predictor for the cardiac event in NIDDM. CONCLUSION: MIBG myocardial scintigraphy was useful for predicting cardiac events and long-term mortality in NIDDM.
BACKGROUND:123I-metaiodobenzylguanidine (MIBG) myocardial scintigraphy is a useful tool for diagnosing cardiac autonomic neuropathy (CAN) in non-insulin-dependent diabetes mellitus (NIDDM). However, the long-term prognostic value for cardiac events or mortality in NIDDM has not been clarified. METHODS AND RESULTS: We investigated the long-term prognostic value of cardiac MIBG imaging for both cardiac event and mortality owing to a variety of causes of death in NIDDM. 144 NIDDM patients were analyzed retrospectively with the end-points of a cardiac event and various causes of mortality. The heart-to-mediastinum uptake ratio on the delayed image (H/M [d]) was obtained from anterior planar imaging. The mean follow-up period was 7.2+/-3.2 years. Seventeen patients had a cardiac event onset and 7 patients died during observation. During the same observation course, 16 patients died, including some who died of cardiac event. Both multivariate and univariate analyses revealed that decreased H/M (d) (<1.7) was the independent predictor of long-term mortality for a variety of causes of death. Although the value of H/M (d) was not a significant prognostic factor for predicting a cardiac event, CAN, diagnosed by a combination of H/M (d) and coefficient variance of RR interval, was an independent predictor for the cardiac event in NIDDM. CONCLUSION:MIBG myocardial scintigraphy was useful for predicting cardiac events and long-term mortality in NIDDM.
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