Seasonal variation in plasma levels of endothelin-1 and nitric oxide

M. McLaren, G. Kirk, C. Bolton-Smith, J. J. F. Belch

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    Background. There is a sea­son­al vari­a­tion in the inci­dence of ­stroke and cor­o­nary heart dis­ease with admis­sions to hos­pi­tal being high­er in the cold­er ­months of the year. The mech­a­nism where­by this win­ter prev­a­lence of vas­cu­lar dis­ease ­occurs is still not fully under­stood. The aim of our study was to meas­ure plas­ma lev­els of vasoac­tive com­pounds through­out the year to estab­lish wheth­er or not there were any fluc­tu­a­tions which could play a part in the high­er win­ter inci­dence.
    Methods. We meas­ured plas­ma lev­els of the vas­o­con­stric­tive endo­the­lin-1(ET) and the vasor­e­lax­ant ­nitric oxide (NO) through­out the year. Blood sam­ples were col­lect­ed from 176 nor­mal indi­vid­u­als. Samples were col­lect­ed ­between 8.00 and 10.00 hours after an over­night fast of at least 12 hours.
    Results. Results were divid­ed into two-month­ly inter­vals and ana­lysed using a Kruskal-Wallis one-way anal­y­sis of var­i­ance and Mann-Whitney U tests (SPSS). We found a sig­nif­i­cant sea­son­al vari­a­tion in both param­e­ters. Mean lev­els of endo­the­lin were high­est in January/February (4.0 pg/ml) and low­est in May/June (2.3 pg/ml), where­as plas­ma 5 ­nitric oxide lev­els were low­est in January/February (5.7 µM) and high­est in Septem-ber/October (9.9 µM); p val­ues were <0.0001 (Jan/Feb vs May/June) and 0.049 (Jan/Feb vs Sept/Oct), respec­tive­ly.
    Conclusions. The high lev­els of the vas­o­con­stric­tor endo­the­lin com­bined with low lev­els of vasor­e­lax­ant ­nitric oxide may ­account in part for the ­increased inci­dence of ­stroke and cor­o­nary heart dis­ease seen in these ­months.
    Original languageEnglish
    Pages (from-to)351-353
    Number of pages3
    JournalInternational Angiology
    Volume19
    Issue number4
    Publication statusPublished - Dec 2000

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