摘要
对30例安置频率程控起搏器患者用超声多普勒方法评估起搏频率变化及心房收缩对血液动力学的影响,结果提示不同心室率的心输出量呈四种反应类型,随着心室率从40次/分增至120次/分,25例心输出量(CO)上升10%以上,2例上升小于10%。心输出量峰值出现在心室率80至120次/分之间。1例无显著变化,2例下降10%以上。心房收缩可提高心输出量11.9～55.2%(平均31.7±13.4%)。
Doppler ultrasound allows non-invasive measurement of cardiac output(CO). The purpose of this study is to evaluate the effect of variations in ventricular rate on CO of patients with ventricular rate programmable pacemaker.Four types of CO response to alterations in ventricular rate were observed in 30 cases. In 25 patients, the output rose significantly (>10%) as the ventricular rate was increased. In 2 patients the rise in CO with increasing ventricular rate was minimal (<10%) Maximum CO was recorded at ventricular rate of 80 to 120/min. In 1 patient, the output rose only 2.4% as the ventricular rate was increased, it was statistically insignificant. In2 patients, more than a 10% fall in CO was noted as ventricular rate was increased. It is therefore impossible to predict maximal CO by changing ventricular rate.The effects of atrial contraction on CO were also observed in 22 patients. There was a significant increase in CO in ventricular contraction,ranging from 11.9 to 55.2%(31.7±13.4%), with atrial contraction compared to that without atrial contraction. These data strongly suggest that ventricular pacing rate and atrioventricular sequential contraction are important to optimal CO. synchronous P-wave or A-V Sequential pacemakers(PMs) and rate-responsive PMs are physiologlcally and clinically superior to idioventricular PMs. Ultrasound Doppler measurement of CO is simple and easy to be repeated. It can be used to guide the adjusting of pacing rate of patients, especially those having cardiac malfunction.
出处
《中国循环杂志》
CSCD
1991年第1期19-20,共2页
Chinese Circulation Journal
