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TIVA anesthesia and intubation stage will make the patient's heart is strong pharmacological and physiological changes in the patient's cardiac function is relatively poor, there will be life-threatening in anesthesia and intubation period , so the need to monitor and assessment of the patient's heart during surgery reserve . The cardiac reserve Monitoring allows doctors and patients to understand the changes of various diseases and heart more specifically in the case of stress , more detailed changes, provide the basis for a more detailed cardiac protection . Currently , widely used in clinical anesthesia ECG monitor , anesthesia monitors such as the lack of the monitoring effort , the the floating catheter is invasive method of monitoring cardiac function monitoring inconvenient , and some indicators of sensitivity in the presence of intraoperative echocardiography the disadvantage of poor . Therefore the patient study non-invasive and convenient perianesthesia cardiac reserve monitoring methods , especially quantitative monitoring method is significant . In this thesis convenient noninvasive heart sound monitoring patients with normal cardiac function quantitative research Wai anesthesia during cardiac reserve . Monitor and quantitative analysis of 103 cases of urinary surgery , ASA grade 1 and 2 , the age distribution of the 16-85 year-old patient in the mixed anesthetic midazolam , vecuronium , fentanyl , propofol role cardiac status . FIR filter and wavelet analysis method , it is found that during anesthesia in the statistical sense , relative to the resting period , the first heart sound ( S1 ) and second heart sound ( S2 ) , blood pressure and heart rate decreased , the patient 's cardiac reserve decline ; during intubation during anesthesia relative to the first heart sound and second heart sounds , blood pressure and heart rate slight increase in the patient 's cardiac reserve is also a slight rise . Confirmed the reserve capacity of the patient's heart during surgery will be changed dynamically , under normal circumstances, during anesthesia cardiac reserve with respect to the resting level will drop ; the cannula during cardiac reserve is gradually restored , but still lower than the overall static income levels . This change can provide a reference for physician medication and management of patients . Also confirmed that the heart sound monitoring , as a non-invasive , high - benefit ratio , objective and repeatable operation , convenient to carry for the clinical intraoperative monitoring is necessary and feasible .
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