ObjectTo evaluate the feasibility of measuring the descending aortic blood flow using transesophageal ultrasound Doppler under cardiopulmonary bypass (CPB). MethodWe retrospectively analyzed the clinical data of 10 adult patients accepted elective cardiac surgery under CPB in March 2014 year. There were 4 males and 6 females with a mean age of 44.5±12.3 years ranging from 24.5-64.0 years. The descending aorta diameter and velocity time integral (VTI) of blood flow of middle esophageal and lower esophageal of these patients were detected by transesophageal echocardiography (TEE) under CPB. We took the formula of classic ultrasound texting the blood flow to calculate the descending aorta blood flow (DABF). At the same time, we recorded the data of CPB and index of hemodynamics. Compared with the flow of CPB pump, we analyzed the correlation between pump flow and the raliability of DABF texting value under CPB. ResultsTwo patients quit the trail for blurred imaging. The quality of blood flow spectrum images aquirded from the middle esophageal were inferior to those from the lower esophageal (P < 0.01) in the 10 patients. Among the patients 90% of DABF from the middle esophageal and 50% of DABF from the lower esophageal were more than pump flow. however, the texting value had an excellence correlation to PF (r=0.795, r=0.825). ConclusionThe classical TEE technique can not obtain accurate blood flow during CPB.
Surgical operation is the first choice for most patients who suffer from early non-small cell lung cancer. The risk of ordinary thoracic surgery is between intermediate and high risk. Due to the high incidence of postoperative pulmonary complications after thoracic surgery, preoperative cardiopulmonary reserve assessment is extremely necessary and important. In recent years, lots of assessment tools are clinically used, including pulmonary function tests, arterial blood gas analysis, breath-holding test and 6-minute walk test. In addition, cardiopulmonary exercise test is used extensively. This article reviews the current status of preoperative cardiopulmonary reserve assessment in thoracic surgery to guide clinical decisions, reduce postoperative complications and improve outcomes.
Abstract： Right ventricular dysfunction or right heart failure is a complex clinical syndrome and often leads to a poor prognosis and high mortality. In order to detect right ventricular dysfunction at an early stage, provide a therapy guidance and evaluate treatment outcomes， right ventricular function evaluation has aroused more and more concern in clinical physicians. With the advantages of being non-invasive， accuracy and repetitiveness， echocardiography is used extensively in the assessment of heart function. In this review， we focus on how to use echocardiography to evaluate right ventricular function easily, efficiently， accurately and sensitively， and provide a good foundation for its further clinical application.
Regional cerebral oxygen saturation cerebral oxygen saturation(rScO2) monitoring by using near-infrared spectroscopy(NIRS) is a simple, sensitive, continuous and noninvasive method, which can detect the change in oxygen supply and demand. It has already draw attentions and applications during perioperative in recent years. The technique was firstly used in cardiac surgery, thereafter some studies found thoracic surgery which mostly used one-lung ventilation also was necessary to monitor rScO2. A series of studies confirmed there were correlations among perioperative adverse events and rScO2. In this paper, we reviewed the basic principle of rScO2, summarized the applications of rScO2 in cardiac and thoracic surgery, discussed the existing problems.
Objective To evaluate the effects of low-dose epinephrine on cerebral oxygen saturation (rScO2) and awakening time during one-lung ventilation (OLV) for thoracic surgery. Methods Thirty consecutive patients undergoing lobectomy from March to July 2016 in our hospital were randomly divided into an epinephrine group (n=15, 8 males and 7 females at an average age of 58.70±11.40 years) or a saline group (n=15, 7 males and 8 females at an average age of 57.00±11.40 years). They were continuously infused with 0.01 μg/(kg·min) epinephrine or saline after general induction. Hemodynamics was maintained ±20% of the baseline value. All patients were ventilated by a pressure control mode during OLV with tidal volume of 5-8 ml/kg and end-tidal carbon dioxide tension (EtCO2) of 35-45 mm Hg. Regional cerebral oxygen saturation (rScO2) was monitored using near-infrared spectroscopy (NIRS) continuously. Results Compared with the saline group, the epinephrine group had a high rScO2 during OLV, with a statisitical significance at OLV 40 min and 50 min (67.76%±4.64% vs. 64.08%±3.07%, P=0.016; 67.25%±4.34% vs. 64.20%±3.37%, P=0.040). In addition, the awakening time of patients in the epinephrine group was shorter than that of the saline group (P=0.004), and the awakening time was associated with the duration of low-dose rScO2 (r=0.374). Conclusion Continuous infusion of 0.01 μg/(kg·min) could improve the rScO2 during OLV and shorten awakening time in thoracic surgery.