DAVID H. SPODICK, M.D., D.SC.
To the editor: In their excellent review "Noninvasive Assessment of Myocardial Function," Shine and associates(1) present a superb account of the state-of-the-art in echocardiography and radionuclide angiocardiography. Yet do radionuclide studies really qualify as noninvasive? I think the designation "noninvasive" should mean exactly what it says, that is, that the body is not penetrated in any way. Intravenous injection of radionuclide material is in and of itself invasive. Moreover, the rays emitted by the isotopes are also clearly a form of penetration, although "in reverse." (One might make the same rigid definition with regard to the ultrasound beam, too, but
DAVID H. SPODICK. When "Noninvasive" Means "Invasive". Ann Intern Med. 1980;92:722. doi: 10.7326/0003-4819-92-5-722_1
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Published: Ann Intern Med. 1980;92(5):722.
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