Author + information
- Received May 12, 1993
- Revision received March 11, 1994
- Accepted March 16, 1994
- Published online August 1, 1994.
- Kazuo Komamura, MDa,∗,
- Masafumi Kitakaze, MD, PhD∗,
- Kazuhiko Nishida, MD∗,
- Masashi Naka, MDa,
- Jun Tamai, MD, PhD†,
- Masaaki Uematsu, MD, PhD†,
- Yukihiro Horetsune, MD, PhD, FACC∗,
- Shinsuke Nanto, MD, PhDa,
- Masatsugu Kori, MD, PHD∗,
- Michitoshi Inoue, MD, PhD‡,
- Takenobu Kamada, MD, PhD∗ and
- Kazuhisa Kodama, MD, FACCa
- ↵∗Address for correspondence: Dr. Kazuo Komamura, Cardiovascular Division, Osaka Police Hospital, 10-31 Kitayama-cho, Tennoji-ku. Osaka 543, Honshu, Japan.
Otjectives. This study was undertaken to examine the effects of coronary flow dynamics after thrombolysis on infant size limitation.
Background. It has been commonly accepted that early thrombolysis does not necessarily salvage infarcted myocardium. Plausible causes for myocardial necrosis include such factors as elapsed time to reperfusion, residual stenosis, collateral vessels, hemodynamic loads, preconditioning and reperfusion injury. Recently, the no reflow phenomenon has been elucidated to be associated with infant extension in clinical studies employing contrast echocardiography or thallium scintigraphy.
Methods. Nineteen patients with early reperfusion in acute anterior myocardial infarction and comparable clinical background were studied. The patients were classified into two groups on the basis of pattern of thermodilution measurements of great cardiac vein flow after reperfusion: group A, 9 patients with a progressive decrease in great cardiac vein flow during the 1st 24 h of the onset of infarction; and group B, 10 patients without this observation. Left ventricular ejection fraction and thallium perfusion defect were compared between the two groups at follow-up.
Results. There were no significant differences in systemic hemodynamic variables between groups A and B, and neither group had recurrent ischemic events suggesting reocclusion or restenosis during the study. In group A, both great cardiac vein flow (mean ± SD 44 ± 17% reduction) and oxygen extraction (38 ± 15% reduction) were progressively decreased after the onset of reperfusion. Compared with group B, this group showed a lower left ventricular ejection fraction (36 ± 7% vs. 63 ± 15%, p < 0.01) and a larger thallium-301 defect severity index (1,091 ± 366 U vs. 247 ± 261 U, p < 0.01) at follow-up. Although other patient characteristics were comparable between the two groups, antecedent angina occurred in 90% of group B patients in contrast to only 33% of group A patients.
Conclusions. Salvage of myocardium from infarction by successful thrombolysis was not observed in the patients demonstrating progressive decreases in great cardiac vein flow (group A). In those patients, inadequate myocardial reperfusion on a microvascular basis might be associated with a much larger myocardial infarction. Antecedent angina may protect against a progressive decrease in coronary flow and may have beneficial effects on infarct size limitation.
- Received May 12, 1993.
- Revision received March 11, 1994.
- Accepted March 16, 1994.