A slit-like narrowing of the lumen of a vein, even with no alteration in cross-sectional area, may increase resistance to flow. Any test to measure venous outflow obstruction must be identified as ...
Mordue, RNC, MSN, NNP, Department of Advanced Practice Nursing, Loma Linda University Children's Hospital, Loma Linda, CA Two-dimensional echocardiogram showing the anomalous right pulmonary vein ...