False-positive results obtained with stress myocardial SPECT in patients with right bundle branch block.
OBJECTIVE
Right bundle branch block (RBBB) is a conduction defect that often is accompanied by nonspecific patient symptoms. The objective of this study was to evaluate the false-positive results obtained with TI-201 myocardial SPECT in patients with RBBB.


METHODS
Thirty-one patients (24 men, 7 women; age range, 35 to 78 years; mean age, 39 +/- 14 years) had nonspecific chest pain and electrocardiograph-proved RBBB, normal results of echography, and normal results of coronary angiography. None of them had a previous history or evidence of myocardial infarction. All patients underwent stress-rest TI-201 myocardial SPECT; 24 had normal images but 7 showed hypoperfusion in the inferolateral segments, both visually and quantitatively.


RESULTS
TI-201 myocardial perfusion scintigraphs must be evaluated carefully in RBBB because false-positive results are likely to occur as a result of functional changes produced by dissynchronous activation between the ventricles.
Küçük
N O
NO
Ankara University Medical Faculty, Department of Nuclear Medicine, Turkey.
Arican
P
P
Ibiş
E
E
Aras
G
G
Berkalp
B
B
Oral
D
D
Kir
K M
KM
D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000000981:diagnostic imaging / Q000503:physiopathology; D002037:Bundle-Branch Block / Q000000981:diagnostic imaging* / Q000503:physiopathology; D017023:Coronary Angiography; D003326:Coronary Circulation / Q000502:physiology; D004452:Echocardiography; D004562:Electrocardiography; D005080:Exercise Test; D005189:False Positive Reactions; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006352:Heart Ventricles / Q000000981:diagnostic imaging / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D005082:Physical Exertion / Q000502:physiology*; D019275:Radiopharmaceuticals; D013794:Thallium Radioisotopes; D015899:Tomography, Emission-Computed, Single-Photon
D019275:Radiopharmaceuticals; D013794:Thallium Radioisotopes