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  • Title: The effect of atrial pacing on the mitral echocardiogram of mitral stenosis recorded simultaneously with haemodynamic data.
    Author: Yousof AM, Endrys J, Zyka I.
    Journal: Cor Vasa; 1975; 17(4):262-8. PubMed ID: 1212870.
    Abstract:
    Simultaneous mitral echocardiograms and haemodynamic data were recorded in six cases of mitral stenosis during atrial pacing. Due to the prolongation of the P-R interval during atrial pacing, the diastolic closure rate E-F was measurable up to a heart rate of 80 per min. only. At a heart rate of 80 or less, both in sinus rhythm and during atrial pacing the diastolic closure rate remained essentially the same in each case. However, above 80/min E-F became too short and post-atrial systolic closure A-B only was available for measurement which was higher in each case than its corresponding E-F value. This contrasts with cases with sinus rhythm where the diastolic closure rate E-F measurable up to a heart rate of 110 per minute.
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