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The effect of altitude on the umbilical artery Doppler resistance
Author(s) -
DeVore G R,
Medearis A L,
Platt L D
Publication year - 1992
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/jum.1992.11.7.317
Subject(s) - medicine , umbilical artery , fetus , altitude (triangle) , vascular resistance , cardiology , gestational age , diastole , linear regression , pregnancy , hemodynamics , blood pressure , genetics , geometry , mathematics , machine learning , computer science , biology
This study examined whether there were differences between the umbilical artery systolic‐diastolic (S/D) ratio and resistance index (RI) in patients with normal fetuses living at sea level (group I) and those living between 4,200 and 4,500 feet above sea level (group II). Linear regression demonstrated a significant association (P less than 0.001) between gestational age and the S/D ratio and RI for groups I (n = 100) and II (n = 128). Least‐squares regression analysis demonstrated no significant differences in slopes or intercepts between groups I and II. The results would suggest that altitude, up to 4,500 feet above sea level, does not affect umbilical artery Doppler resistance in normal fetuses.