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Biomedical subjects

X S Yang

Publications and source records attributed to X S Yang.

41 records · Page 3Linked to original sources
PubMedDate not supplied

Automated echocardiographic quantification of left ventricular volumes and ejection fraction: validation in the intensive care setting.

To validate automated boundary detection measurements of left ventricular volumes, cardiac output, and ejection fraction, we studied 50 patients in the intensive care unit. End-diastolic volume, end-systolic volume, and ejection fraction were calculated by automated boundary detection and compared with two-dimensional echocardiographic images. Automated boundary detection-derived cardiac output was compared with thermodilution measurements and Doppler calculations of flow through the aortic and pulmonic valves. Automated boundary detection agreed well with two-dimensional measurements for end-diastolic volume (r = 0.98), end-systolic volume (r = 0.98), and ejection fraction (r = 0.91). Cardiac output derived from automated boundary detection correlated with two-dimensional echocardiographic measurements (r = 0.84), thermodilution (r = 0.83), aortic valve Doppler (r = 0.75), and pulmonic valve Doppler (r = 0.60). Automated boundary detection measurements of left ventricular volumes, ejection fraction, and derived cardiac output are feasible in patients in intensive care units. This method yields rapid, accurate result compared with thermodilution, two-dimensional images, and Doppler measurements.

Aged↗
PubMedDate not supplied

Serum lipids in the People's Republic of China. Comparison of Western and Eastern populations.

Serum cholesterol and HDL cholesterol levels were measured in an urban and a rural population of the People's Republic of China and compared with cholesterol values obtained in Belgium and in the Republic of Korea, with use of the same methodology. Total cholesterol levels were markedly lower in the People's Republic of China than in Belgium and generally lower than in Korea, both in male and female subjects. However, the differences in HDL cholesterol levels among the three populations were small in males and only significantly higher in Belgium in the age classes below 34 years. In women of all age groups, HDL cholesterol values were significantly higher in Belgium than in China and Korea. Total cholesterol levels below 100 mg/dl were found in the People's Republic of China in about 2% of the participants. Apolipoprotein B was significantly lower, and the apolipoprotein A1/B ratio was significantly higher, in China and Korea compared to Belgium.

Adolescent↗