[Normal behavior during the exercise test of the left ventricular ejection fraction determined by an angioscintigraphic method].
The correct definition of left ventricular ejection fraction (LVEF) normal response to exercise is still debated. The lack of unanimous agreement firstly depends on the different normality criteria adopted in literature. In order to make ligh, we carefully reviewed several papers on this matter, and performed exercise radionuclide angiography (RNA), by multiple gated blood pool, in 2 different populations. I group: 39 normal subjects, selected on the basis of normal clinical examinations, ECG, X-ray film, exercise test, at rest LVEF greater than 50%: 20 males, mean age 43 +/- 13%. II group: 22 patients, abnormal from the clinical point of view, but elsewhere included in control groups: 13 males, mean age 54 +/- 9%. 14 of them refer only atypical chest pain, in 5 the sole abnormal finding is an exercise-induced ST depression greater than 1 mm, in 2 a left bundle branch block at rest, 1 patient suffers from X syndrome. Symptom limited exercise RNA was carried out by adopting a semi supine (40 degrees) cycloergometer, with a 25 watt initial workload and 25 watt subsequent increases every 3 minutes; count acquisition lasted 2 minutes, from the end of the 1st to the end of the 3rd, during each stage of the test.


RESULTS
I group: constant LVEF increment during exercise in all subjects: mean LVEF at rest was 65 +/- 8%, at maximum workload 80 +/- 8%: mean increase was 15 +/- 7%.(ABSTRACT TRUNCATED AT 250 WORDS)
D000328:Adult; D000368:Aged; D005080:Exercise Test; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging*; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D013318:Stroke Volume
Sul comportamento normale durante sforzo della frazione di eiezione ventricolare sinistra determinata con metodo angioscintigrafico.