Complete and intermediate atrioventricular canal in infants less than a year old: observations of anatomical and pathological variants in left ventricular outflow tract.
Abstract In a study of 13 postmortem specimens from infants with intermediate and complete forms of persisting atrioventricular (AV) canal, potentially obstructive left ventricular outflow tract morphology was apparent in 6. Possible obstructive components included various causes of anterior mitral leaflet immobility, multiple short chordae, anterior malposition of papillary muscles, and septal hypertrophy. Left ventricular outflow tract obstruction can be exaggerated by corrective techniques that do not produce relief of these conditions.
According to fractal characteristics of the arrival passenger flow volume of the urban rail transit station, the paper established the arrival passenger flow volume short-term forecasting model based on the fractal theory. Then, the paper took the AHQB station of MRT Line Four in Beijing as an example and forecasted the short-term arrival passenger flow volume. Lastly, the paper gave a comparison between the predicted value and the actual value, and found that the maximum error was less than 7 %. It indicated that the model established could be used to forecast the short-term arrival passenger flow volume of the urban rail transit, and had better adaptability.