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Chronobiologic aspects of recurrent transient ischemic attack.

C Fersini, R Manfredini, F Manfredini

    Progress in Clinical and Biological Research
    |January 1, 1987
    PubMed
    Summary
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    Transitory ischemic attacks (TIAs) show a seasonal pattern, peaking in early spring (March-April) and late in the month. Circadian rhythms also influence TIA onset, with a significant acrophase detected.

    Area of Science:

    • Epidemiology
    • Neurology
    • Chronobiology

    Background:

    • Transitory ischemic attacks (TIAs) are critical warning signs for stroke.
    • Understanding temporal patterns of TIAs can aid in prevention and management.

    Purpose of the Study:

    • To investigate the temporal patterns (seasonal, monthly, daily, and hourly) of transitory ischemic attacks (TIAs).
    • To identify potential circadian and seasonal rhythms in TIA occurrence.

    Main Methods:

    • An epidemiologic study analyzed TIA onset data from 80 patients (aged 51-88) from 1979-1984.
    • Time-series analysis and single cosinor methods were employed to detect temporal patterns and acrophases.

    Main Results:

    • A significant seasonal pattern was observed, with peaks in early spring (March-April), and isolated peaks in January and October.

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  • TIA onset showed a distribution in the last 10 days of the month.
  • A significant circadian rhythm (acrophase) for TIA onset was identified (P < 0.05).

    • Conclusions:

    • TIA occurrence exhibits distinct seasonal and daily patterns.
    • These findings highlight the importance of chronobiology in understanding TIA risk and timing.
    • Further research into environmental factors influencing these temporal patterns is warranted.