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      On the Reliability of Systolic Time Intervals

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          Abstract

          With the purpose of detecting spontaneous variation of systolic time intervals (STI), 20 normal subjects have been examined and the STI has been recorded for 5 consecutive days at the beginning of the test and 20, 40 and 60 min afterwards. Significant differences were found for PEP, LVET and the PEP/LVET ratio between observations (p < 0.05) and between days (p < 0.01). All the values of the STI at the fifth day are rather near the values recorded at the last observation of the first day. This may be related to the presence of some factor (catecholamine release induced by emotional stress?) resulting in physiological changes which are reduced by repetition of the test. This hypothesis was confirmed in a second series of normal volunteers where the STI were recorded simultaneously with sampling of blood for assessing circulating CA levels. A highly significant correlation (p < 0.001) was recorded between PEP, PEP/LVET and plasma CA making it evident that the increase of PEP<sub>I</sub> and PEP/LVET is directly correlated with the reduction of plasma CA level.

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          Author and article information

          Journal
          CRD
          Cardiology
          10.1159/issn.0008-6312
          Cardiology
          S. Karger AG
          0008-6312
          1421-9751
          1982
          1982
          07 November 2008
          : 69
          : 3
          : 157-165
          Affiliations
          aBrescia Civil Hospitals, 4th Division of Medicine, and bChair of Mathematics for Life Sciences, University of Milan, Italy
          Article
          173498 Cardiology 1982;69:157–165
          10.1159/000173498
          7127348
          © 1982 S. Karger AG, Basel

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          Page count
          Pages: 9
          Categories
          Original Paper

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