Abstract | OBJECTIVES: Stress thallium-201 (201Tl) myocardial scintigraphy can demonstrate perfusion abnormalities, especially in the septum in patients with complete left bundle branch block (CLBBB) even with angiographically normal coronary arteries. Differences in the images between exercise and pharmacological stress 201Tl myocardial scintigraphy were evaluated in patients with CLBBB and normal coronary arteries. METHODS: RESULTS: Peak blood pressure levels and heart rates were significantly higher in the exercise stress group than in the pharmacological stress group (p < 0.001). The rate of defects in stress images was significantly higher in the exercise stress group (72.4%; 21/29 cases) than in the pharmacological stress group (18.8%; 3/16 cases) (p < 0.01). The rate of redistribution of observed defects in delayed images was 76.2% (16/21 cases) in the exercise stress group, and 0% (0/3 cases)in the pharmacological stress group (p < 0.01). The myocardial segments showing defects were different between the exercise stress group and the pharmacological stress group. CONCLUSIONS: Patients with CLBBB showed different frequencies of defects by stress 201Tl myocardial scintigraphy according to the stress method. Moreover, defects also occured in areas other than the septum. Blood pressure and heart rate were involved in the mechanisms of defects in left bundle branch block.
|
Authors | Hideki Sasaki, Mitsuyuki Shimizu, Kazuhiko Ogawa, Fumiko Okazaki, Tsuneo Mizokami, Masafumi Kusaka, Yoshiki Uehara, Ikuo Taniguchi, Seibu Mochizuki |
Journal | Journal of cardiology
(J Cardiol)
Vol. 49
Issue 4
Pg. 179-85
(Apr 2007)
ISSN: 0914-5087 [Print] Netherlands |
PMID | 17460878
(Publication Type: Comparative Study, Journal Article)
|
Chemical References |
- Thallium Radioisotopes
- Adenosine Triphosphate
|
Topics |
- Adenosine Triphosphate
- Aged
- Blood Pressure
- Bundle-Branch Block
(diagnostic imaging, physiopathology)
- Coronary Angiography
- Exercise Test
- Female
- Heart
(diagnostic imaging)
- Humans
- Male
- Middle Aged
- Thallium Radioisotopes
- Tomography, Emission-Computed, Single-Photon
|