[Assessment of the background count to measure the left ventricular ejection fraction with a nuclear stethoscope].

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  • Author(s): Doi M;Doi M; Itoh H; Hiroe M; Taniguchi K; Marumo F
  • Source:
    Kaku igaku. The Japanese journal of nuclear medicine [Kaku Igaku] 1993 Jun; Vol. 30 (6), pp. 681-6.
  • Publication Type:
    Journal Article
  • Language:
    Japanese
  • Additional Information
    • Source:
      Publisher: Japanese Society Of Nuclear Medicine Country of Publication: Japan NLM ID: 2985202R Publication Model: Print Cited Medium: Print ISSN: 0022-7854 (Print) Linking ISSN: 00227854 NLM ISO Abbreviation: Kaku Igaku Subsets: MEDLINE
    • Publication Information:
      Publication: Tokyo : Japanese Society Of Nuclear Medicine
      Original Publication: Tokyo, Nankodo [1964]-
    • Subject Terms:
      Heart Function Tests* ; Stroke Volume* ; Ventricular Function, Left*; Heart/*diagnostic imaging; Adult ; Gamma Cameras ; Gated Blood-Pool Imaging ; Heart Auscultation ; Humans ; Male ; Monitoring, Physiologic ; Scintillation Counting
    • Abstract:
      The nuclear stethoscope is a newly developed device for monitoring left ventricular ejection fraction (EF) with a pair of cadmium telluride detector for both left ventricular count (first channel) and background count (second channel). Although it is useful for evaluating the cardiac function during exercise, the methodology of the calculation for distinguishing the net ventricular blood count from the background count has not been established yet. In order to establish a reasonable method to calculate EF, we measured EF using a nuclear stethoscope and conventional gated blood pool scintigraphy in 20 healthy volunteers. All subjects underwent two supine ergometer exercise tests consisting of the 3 stages for the nuclear stethoscope and blood pool scintigraphy. The EF was determined with the following three method for the nuclear stethoscope; 1) Cut-off level was fixed at 70% of first channel, 2) Cut-off level at 75%, 3) Cut-off level was determined by the background count obtained from second channel. There was a poor relationship between the EFs obtained from gated blood scintigraphy and the EFs from the nuclear stethoscope calculated by any of these method. Regarding the EF calculated using the background count, however, the delta values of EF between rest and any of the 3 stages during exercise correlated closely to those EF from blood scintigraphy. When we apply the EF-at-rest value obtained from blood pool scintigraphy to analysis with the nuclear stethoscope, the EFs of 3 stages indicated good correlation (Stage I r = 0.91, Stage II r = 0.82, Stage III r = 0.69).(ABSTRACT TRUNCATED AT 250 WORDS)
    • Publication Date:
      Date Created: 19930601 Date Completed: 19930907 Latest Revision: 20170220
    • Publication Date:
      20240829
    • Accession Number:
      8345699