Regional myocardial function and response to acute afterload increase in chronically anemic fetal sheep: evaluation by two-dimensional strain echocardiography.
We hypothesized that in chronic fetal anemia, remodeling of the myocardium is related to abnormalities in regional wall motion and acutely increased afterload further disturbs myocardial strain. Chronic anemia was induced in one fetus of each of seven sheep twin pregnancies. The fetuses were studied by two-dimensional (2-D) strain echocardiography at baseline and during increased afterload via angiotensin II (AT II) infusion. At baseline, the peak systolic longitudinal, radial and circumferential strains in the left ventricular lateral wall in anemic fetuses were lower than those in the controls (all p<0.05). During AT II, the circumferential strain of right ventricular free wall decreased significantly both in the control and anemic fetuses. Left ventricular free wall systolic strains were not affected by AT II. Fetal myocardial remodeling in chronic anemia decreases left ventricular systolic free wall strains. The myocardial adaptation does not change ventricular responses to acutely increased afterload.
Wuhan General Hospital of Guangzhou Command, Wuhan, China.
Li
L
Xiong
Leah S
LS
Bernard
Jason N
JN
Hashima
You-Bin
YB
Deng
Zhiwen
Z
Zhou
Muhammad
M
Ashraf
A Roger
AR
Hohimer
Lowell E
LE
Davis
Weihui
W
Shentu
David J
DJ
Sahn
Juha
J
Rasanen
D000740:Anemia / Q000000981:diagnostic imaging / Q000503:physiopathology*; D000804:Angiotensin II / Q000494:pharmacology; D000818:Animals; D001794:Blood Pressure; D002908:Chronic Disease; D004452:Echocardiography; D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology*; D009200:Myocardial Contraction; D011247:Pregnancy; D034561:Sheep, Domestic; D013318:Stroke Volume; D016216:Ultrasonography, Prenatal; D014662:Vasoconstrictor Agents / Q000494:pharmacology; D016277:Ventricular Function, Left; D020257:Ventricular Remodeling
D014662:Vasoconstrictor Agents; D000804:Angiotensin II