Idioventricular low frequency oscillation in QT interval responds univocally to RR confusing kinds of mental stress

  • Serban Dincą-Panaitescu
  • Mihaela Dincą-Panaitescu
  • Alin Achim
  • Radu Negoescu


Seventeen male subjects, aged nineteen to twenty, went through a protocol including, while supine, relaxation at rest (10 min) and mental stress (MS) by a Kraepelin (arithmetic) test (5 min), as part of a larger study. With a polygraphic analog recording set-up we also collected a 1 ms - digital facsimile of a lead II-like thoracic ECG with maximum T-wave (Codas, Dataq Instr). Twenty-three stress responses were assigned to three classes according to known cardiotacho-, plethysmo-, and pneumo-graphic marks of “concentrated attention mainly,” “emotion,” or still “high emotion.” During each setting the most stationary 3 min RR epoch in cardiotachogram was selected for joint RR & QT beat-by-beat variability study. RR and QT intervals were detected using a published algorithm. Conventional RR and QT Fourier autospectra were computed while using RR*QT mean square coherence spectrum we detached the RR-independent, idioventricular (IV) fraction of QT low frequency (LF: 0.04–0.15 Hz) power of variability (IV QT-LF).

IV QT-LF responded consistently to varieties of mental stress that confuse RR-LF or let QT-LF unchanged, best witnessing the cortically-issued ventricular adrenergic strain. Indeed, while emotion propels the same way all spectral variables above, concentrated attention increased (Wilcoxon) significantly IV QT-LF only (0.54–0.80 ms2) and decreased RR-LF (715–465 ms2). Findings hold promise of a non-invasive, high resolution Holter based monitoring of sympathetic status of myocardium, robust vis-à-vis of confusion caused by the autonomic interplay at sino-atrial node.


Heart Rate Variability Mental Stress European Heart Journal Systolic Time Interval Diabetic Autonomic Neuropathy 
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Copyright information

© Springer 1988

Authors and Affiliations

  • Serban Dincą-Panaitescu
    • 1
    • 2
  • Mihaela Dincą-Panaitescu
    • 1
    • 2
  • Alin Achim
    • 1
    • 2
  • Radu Negoescu
    • 1
    • 2
  1. 1.Department of Cardiovascular ProphylaxyInstitutul De Sanatate Publica BucurestiBucharestRomania
  2. 2.Institute of Applied InformaticsAISTEDA UniversityBucharestRomania

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