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Prognosis in patients with left bundle branch block and normal dipyridamole thallium-201 scintigraphy
Insights
Patients with left bundle branch block (LBBB) and normal myocardial perfusion on dipyridamole thallium-201 scintigraphy have a favorable prognosis. Clinical events were infrequent and occurred late, with no hard cardiac events observed in this study.
Area of Science:
- Cardiology
- Nuclear Cardiology
- Diagnostic Imaging
Background:
- Left bundle branch block (LBBB) often indicates a poorer prognosis, particularly in coronary artery disease (CAD) patients.
- Normal dipyridamole-thallium scintigraphy suggests a favorable outcome in patients with suspected CAD and normal conduction.
Purpose of the Study:
- To evaluate the prognosis of patients diagnosed with LBBB who exhibit normal myocardial perfusion on dipyridamole thallium-201 scintigraphy.
- To determine the clinical outcomes in this specific patient subgroup.
Main Methods:
- Retrospective analysis of 69 patients with complete LBBB and normal myocardial perfusion on dipyridamole SPECT thallium-201.
- Patients were monitored for clinical events between 1988 and 1995 for suspected CAD.
Main Results:
- The study monitored 69 patients (mean age 59 years) for a mean of 33 months.
- Four patients experienced unstable angina, with two requiring revascularization; no deaths or myocardial infarctions occurred.
- All reported events happened at least two years post-scintigraphy.
Conclusions:
- Normal myocardial perfusion on dipyridamole thallium-201 scintigraphy is associated with a very good prognosis in patients with suspected CAD and LBBB.
- This subgroup demonstrates a low rate of clinical events, which manifest late, and a notable absence of major adverse cardiac events.
Background:
The presence of complete left bundle branch block (LBBB) is commonly associated with a poorer prognosis, especially in patients with coronary artery disease (CAD). In the general population with suspected CAD and normal intraventricular conduction, a normal dipyridamole-thallium scintigraphy is a strong marker of a favorable outcome.
Objective:
Our objective was to assess the prognosis in patients with LBBB and a normal dipyridamole thallium-201 scintigram.
Population And Methods:
Patients with complete LBBB and normal myocardial perfusion on dipyridamole SPECT thallium-201 scintigraphy performed in our center for suspected CAD between 1988 and 1995 were monitored for clinical events.
Results:
Sixty-nine patients (36 women and 33 men) with a mean age of 59 years (range 56 to 61) were monitored for a mean period of 33 months (range 25 to 35). During this period, 4 patients had unstable angina, 2 of whom underwent myocardial revascularization. There were no deaths or myocardial infarction. All events occurred at least 2 years after the thallium-201 scintigraphy.
Conclusion:
The presence of a normal myocardial perfusion with dipyridamole thallium-201 scintigraphy in this group of patients with suspected CAD and LBBB was associated with a very good prognosis, a low rate of clinical events occurring only 2 years after the myocardial scintigraphy, and no hard events.