Abstract
The design of a practical instrument for measurement of the value of the pre-ejection period (p.e.p.) of the cardiac cycle in real time is presented. This arrangement has the capability of determining the p.e.p. in the presence of relatively large amounts of biological-origin noise. A commercial Doppler ultrasound technique is used to obtain the aortic-valve velocity profile. An electrocardiographic (e.c.g.) trigger circuit provides a synchronising signal which is required to establish the beginning of the p.e.p. interval.
Sommaire
Les auteurs présentent un modèle d'instrument pratique permettant de mesurer la valeur de la période de pré-éjection du cycle cardiaque en temps réel. Cette configuration permet de déterminer la période de pré-éjection en présence d'un volume important de bruits d'origine biologique. Pour obtanir le profile de vélocité de la valve aortique, on a fait appel à une technique commerciale d'ultrasons Doppler. Un circuit de déclenchement électrocardiographique fournit le signal de synchronisation nécessaire pour établir le début de l'intervalle de la période de pré-éjection.
Zusammenfassung
Es wird Konstruktion eines praktischen Instruments zum Messen der Herztätigkeit des Fötus vor der Geburt (p.e.p.) in Realzeit vorgestellt. Das Gerät kann durch relativ große Mengen biologische verursachter Geräusche die Zeit bis zur Geburt bestimmen. Ein kommerzielles Ultraschall-Dopplerverfahren wird eingesetzt, um ein Geschwindigkeitsprofil der Aortenklappe zu erhalten. Eine EKG-Impulsauslösung liefert das synchronisierende Signal, das erforderlich ist, um den Anfang der P.E.P.-Strecke festzulegen.
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References
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Cousin, A.J., Smith, K.C., Rowe, I.H. et al. A cardiac pre-ejection period monitor for foetal assessment during labour. Med. & biol. Engng. 12, 479–482 (1974). https://doi.org/10.1007/BF02478604
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DOI: https://doi.org/10.1007/BF02478604