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Objective:To investigate the current basic situation of ultrasound machines of ultrasound departments in Shanghai medical institutions, and to provide the basis for making management policy in order to promote medical quality.Methods:Questionnaire surveys about ultrasound machines and service ability including producing countries of ultrasound machines, the number of ultrasound machines, using years of ultrasound machines, yearly workload and the yearly number of patients that each ultrasound machine accepted were made in 2013 and 2018, respectively. Statistical results were compared between the two surveys.Results:Compared with 2013, the share of imported ultrasound machines declined in 2018 (82% vs 91%). Compared with 2013, the number of ultrasound machines in Shanghai medical institutions had increased by 31% in 2018 (2 123 vs 1 617). The occupancy rate of ultrasound machines in tertiary hospitals was the highest (tertiary hospitals 40%, secondary hospitals 25%, primary grade hospitals 20%, and private hospitals 15%). Compared with 2013, the proportion of ultrasound machines that have been used for more than 10 years increased (9% vs 4%), the yearly workload of ultrasound examination had increased by 46% (19.82 million person-time vs 13.59 million person-time). Tertiary hospitals bored the highest proportion of the workload (tertiary hospitals 51%, secondary hospitals 35%, primary grade hospitals 4%, and private hospitals 10%). Currently, the number of ultrasound machines per 10, 000 people in Shanghai was 1.14. The yearly number of patients that each ultrasound machine accepted had increased by 11% (9300 person-time vs 8400 person-time in 2018).Conclusions:The scale of ultrasound departments in Shanghai medical institutions has been developing. Brand localization of ultrasound machines is improving. However, the renewal ability of ultrasound machines still needs to be improved. The workload of ultrasound department is getting heavier. Hierarchical diagnosis and treatment is unbalanced.
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Objective@#To investigate the current basic situation of ultrasound machines of ultrasound departments in Shanghai medical institutions, and to provide the basis for making management policy in order to promote medical quality.@*Methods@#Questionnaire surveys about ultrasound machines and service ability including producing countries of ultrasound machines, the number of ultrasound machines, using years of ultrasound machines, yearly workload and the yearly number of patients that each ultrasound machine accepted were made in 2013 and 2018, respectively. Statistical results were compared between the two surveys.@*Results@#Compared with 2013, the share of imported ultrasound machines declined in 2018 (82% vs 91%). Compared with 2013, the number of ultrasound machines in Shanghai medical institutions had increased by 31% in 2018 (2 123 vs 1 617). The occupancy rate of ultrasound machines in tertiary hospitals was the highest (tertiary hospitals 40%, secondary hospitals 25%, primary grade hospitals 20%, and private hospitals 15%). Compared with 2013, the proportion of ultrasound machines that have been used for more than 10 years increased (9% vs 4%), the yearly workload of ultrasound examination had increased by 46% (19.82 million person-time vs 13.59 million person-time). Tertiary hospitals bored the highest proportion of the workload (tertiary hospitals 51%, secondary hospitals 35%, primary grade hospitals 4%, and private hospitals 10%). Currently, the number of ultrasound machines per 10, 000 people in Shanghai was 1.14. The yearly number of patients that each ultrasound machine accepted had increased by 11% (9300 person-time vs 8400 person-time in 2018).@*Conclusions@#The scale of ultrasound departments in Shanghai medical institutions has been developing. Brand localization of ultrasound machines is improving. However, the renewal ability of ultrasound machines still needs to be improved. The workload of ultrasound department is getting heavier. Hierarchical diagnosis and treatment is unbalanced.
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Objective To assess the radial systolic function of left ventricle(LV) in patients with dilated cardiomyopathy(DCM) by velocity vector imaging(VVI).Methods Sixteen patients with DCM and twenty control subjects were detected by VVI.VVI data were collected from the six basal segments and six mid segments in parastenal LV short axis views.The radial systolic velocity(V) ,strain(ε) ,strain rate(SR),the time to peak systolic velocity(PTV) and the time to maximum strain(PTε) were measured with special software.The differene of the earliest and the latest time to peak velocity(T-max) and the standard deviation of time to peak velocity(T-SD) of 12 segments were calculated.Results Compared to the controlled group,patients with DCM had significantly lower radial V,ε and SR (P ＜0.01) in all the 12 segments,significantly longer PTV and PTε (P ＜ 0.05) in most segments, and significantly larger T-max and T-SD (P ＜0.05).Conclusions VVI is useful to assess the abnormalities in LV radial movement in patients with DCM and could provide more information about regional cardiac function.
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In this paper is used the rough set theory to deal with the information contained in electrocardiographic waveforms and to find out the correlation between coronary heart disease (CHD) and the selected indices in electrocardiographic lead I. The principles of attribute reduction are applied, the redundancy of a decision-making table is reduced, and the important characters and diagnostic rules are extracted. The real case analysis shows that clear and concise diagnostic rules can be established by using rough set theory, which can be helpful to the clinical diagnosis of CHD.
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Humans , Algorithms , Coronary Disease , Diagnosis , Decision Making, Computer-Assisted , Electrocardiography , Methods , Predictive Value of Tests , Signal Processing, Computer-AssistedABSTRACT
Objective To evaluate the left ventricular(LV) torsion and rotation in normal subjects using vector velocity imaging.Methods LV basal and apical short-axis images were captured in 10 healthy individuals to estimate LV torsion and rotation using routine 2-dimensional echocardiography and vector velocity imaging. Results As viewed from LV apex,the systolic basal rotation was clockwise (negative value),and apical rotation was counterclockwise (positive Value). The apical peak systolic rotational velocity was significantly higher than the basal [endo:(150±62)°/s vs (114±65)°/s;epi:(81±40)°/s vs (55±28)°s,respectively,P＜0.01]. The peak systolic endocardial rotational velocity and rotation was significantly higher than epicardial rotational velocity and rotation[basal:(-114±65)°/s vs (-55±28)°/s,(-12±6)°vs (-4±1)°;apical:(150±62)°s vs (81±40)°s,(10±4)°vs(6±2)°,respectivelv,P＜0.05]. There were no significant differences in the time to peak systolic rotational velocity/rotation between basal endocardium/epicardium and apical endocardium/epicardium. Conclusions Vector velocity imaging can assess LV torsion and rotation non-invasively,and normal LV has a kind of characteristic motion of torsion.
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Objective To describe the echocardiographic and clinical findings of patients with accessory mitral valve(AMV).Methods Four adult patients were diagnosed to have AMV by Doppler echocardiography.Results All the four patients had cardiac murmur but 2 were asymptomatic.Echocardiogram showed that two cases had isolated AMV with significant left ventricular outflow tract (LVOT)obstruction.Another patient was complicated by idiopathic hypertrophic subaortic stenosis and his systolic pressure gradient across the LVOT reduced to normal after taking negative inotropic drugs.The fourth patient was associated with complex congenital cardiac anomalies but without LVOT obstruction.Conclusions AMV may not be very rare as previously reported.An echocardiographic examination Can detect AMV and difierentiate it from other causes of LVOT obstruction.
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Objective To evaluate left ventricular wall motion changes after successful pereutaneous coronary artery intervention (PCI) in patients with acute myocardial infarction (MI) by velocity vector imaging (VVI). Methods Twenty patients with acute MI, 16 anterior MI and 4 inferior MI,were studied by VVI within 3 days before PCI, 1 week and 3 months after PCI. The VVI parameters included peak systolic myocardial velocity (Vsys), peak systolic strain (εsys), maximal strain (εmax), peak systolic strain rate ( SRsys), isovolumic relaxation strain rate(SRivr),segmental ejection fraction (sEF), time to peak of velocity (TPKvel),and time to peak of strain (TPKε). Results Compared with that before PCI,εsys, SRsys, sEF, PSI, SRivr/SRsys, and TPKε were improved one week after PCI,and were further significantly improved at 3 months follow-up. Conclusions The VVI parameters can be used to evaluate the effectiveness of PCI shortly after the procedure and during long-term follow-up.
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Objective To evaluate the role of transeso phageal echocardiography(TEE) before chemical or electric cardioversion for non-vulvular atrial fibrillation. Methods Forty-three patients, confirmed non-vulvular atrial fibrillation, undertook anticoagulation or anti-platelet therapy and transthoracic echocardiography and TEE less than 24-48 hours prior to cardioversion. Results Two thrombi in the left atrial appendage and three spontaneous echo contrasts in the left atrium were evidenced. After anticoagulation or anti-platelet therapy, 39 patients undertook cardioversion therapy. Among them,31 patients received drug cardioversion,success in 19,and failure in 12;8 patients received electric cardioversion,success in 6,and failure in 2. There were no thromboembolic events during the hospitalization. Conclusions TEE performed before cardioversion for atrial fibrillation is necessary to reduce the risks of thromboembolic events and to guide for anticoagulation therapy.
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Objective To determine the accuracy and usefulness of dobutamine stress echocardiography(DSE) in detecting restenosis after percutaneous coronary intervention (PCI). Methods DSE was conducted in 47 patients before coronary angiography, 6 months to 18 months after PCI. The standard protocol of DSE was 5,10,20,30 ?g?kg~(-1)?min~(-1) with subsequent incremental increases every 3 minutes to a maximum dose of 40 ?g?kg~(-1)?min~(-1). Consistency of the results was compared between DSE and coronary angiography.Results Compared with coronary angiographic results, DSE had a low sensitivity(64%) but high specificity(86%) for detection of restenosis after PCI. The total accuracy was 72%. Conclusions DSE can assess restenosis after PCI with lower cost and safety.
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Objective To evaluate the efficacy of a new micro-bubble contrast agent of C_3F_8 in the opacification of the left ventricle. Methods Seven pigs received a bolus injection of C_3F_8 (0.002) and (0.02) (ml/kg) intravenously. Left ventricular opacification grades and number of endocardial border delineation segments were observed and left ventricular ejection fraction(LVEF) were measured using modified Simpson method after each intravenous contrast injection. Heart rate and respiration rate were recorded before and after each injection. Results There was a significant improvement for every measurement of contrast enhancement in each intravenous injection. In addition, part of myocardial tissue could be enhanced after contrast injection. There was no difference in heart rate and respiration rate between pre- and post-injection. Conclusions This new contrast agent is safe and helpful in delineating endocardial border of the left ventricle.