Lagi Alfonso, Cencetti Simone, Cartei Alessandro
Dipartimento di Medicina Interna, Ospedale Santa Maria Nuova, Piazza S. Maria Nuova, 50100 Firenze, Italy.
ISRN Cardiol. 2011;2011:659787. doi: 10.5402/2011/659787. Epub 2011 Apr 14.
Objective. The events characterizing the very last part of the vasovagal crisis has not been determined. The aim of the study was to analyze the variations in respiratory pattern preceding the vaso-vagal syncope full-blown and the relationship between cardiovascular functions in order to assess the temporal sequence. Methods. Eleven consecutive patients were studied. Heart rate, arterial pressure, respiratory frequency, tidal volume, carbon dioxide, and oxygen saturation in time domain from supine and standing recordings were analyzed. Results. The respiratory activity is different in the time frame preceding syncope, both in V(T) and breathing rate, and that the increase of the lung ventilation does not influence the baroreflex control during the presyncopal period but may be cause of the baroreflex failure during the full-blown syncope.
目的。血管迷走性晕厥最后阶段的特征性事件尚未确定。本研究的目的是分析血管迷走性晕厥发作前呼吸模式的变化以及心血管功能之间的关系，以评估时间顺序。方法。对11例连续患者进行了研究。分析了仰卧位和站立位记录的时域中的心率、动脉压、呼吸频率、潮气量、二氧化碳和氧饱和度。结果。在晕厥前的时间段内，呼吸活动在潮气量和呼吸频率方面均有所不同，并且肺通气量的增加在晕厥前期不影响压力反射控制，但可能是完全性晕厥期间压力反射衰竭的原因。
