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[Evaluation of infantile ventricular tachycardia by 201Tl myocardial SPECT]
Insights
Thallium-201 myocardial SPECT imaging identified persistent defects in children with ventricular tachycardia (VT). This technique aids in determining the cause and prognosis of infantile VT when echocardiography is normal.
Area of Science:
- Nuclear Cardiology
- Pediatric Cardiology
- Diagnostic Imaging
Background:
- Infantile ventricular tachycardia (VT) can be challenging to diagnose.
- Echocardiography often shows normal findings in these cases.
- Identifying the etiology and prognosis of pediatric VT is crucial.
Purpose of the Study:
- To evaluate the utility of 201Tl myocardial SPECT in diagnosing infantile VT.
- To correlate SPECT findings with clinical presentation and prognosis.
- To explore SPECT as a tool for understanding VT origins in children.
Main Methods:
- Four pediatric patients (11-14 years) with VT underwent exercise-loading 201Tl scintigraphy.
- Exercise was performed using a sitting ergometer.
- Electrocardiography (ECG) and echocardiography were also conducted.
Main Results:
- Myocardial SPECT revealed persistent perfusion defects in three out of four cases, predominantly in the anteroseptal wall.
- Echocardiography showed no abnormal findings in any of the patients.
- ECG showed sinus arrhythmia in most cases, with one exhibiting pre-existing ventricular extrasystoles.
Conclusions:
- 201Tl myocardial SPECT is a valuable tool for investigating the etiology of infantile VT.
- SPECT imaging can reveal myocardial abnormalities not detected by echocardiography.
- This technique may assist in assessing the prognosis of ventricular tachycardia in pediatric populations.
Abstract:
201Tl myocardial SPECT findings in infantile ventricular tachycardia (VT) were examined. The subjects were 4 cases of infantile VT subjected exercise-loading 201Tl scintigraphy in 1990. These cases (3 males and 1 female) were aged 11-14 years, being persistent and non-persistent type VT (2 cases each). Echocardiography revealed no abnormal findings in these 4 cases. Exercise-loading was performed by means of sitting ergometer. ECG revealed sinus arrhythmia except for one case which throughout its course of treatment, had already been presenting ventricular extrasystole from before the exercise-loading. Myocardial SPECT revealed persistent defects (anteroseptal wall defects in three case). The above suggests that 201Tl myocardial SPECT enables us to search for etiology of VT, prognosis and the like.