ArticleThe Journal of physiology2025
Enhanced myocardial perfusion in late gestation fetal lambs with impaired left ventricular inflow.
Article in The Journal of physiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Robust preclinical models of asymmetric ventricular loading in late gestation reflecting conditions such as hypoplastic left heart syndrome are lacking. We characterized the morphometry and microvascular function of the hypoplastic left ventricle (LV) and remaining right ventricle (RV) in a sham-controlled late gestation fetal lamb model of impaired left ventricular inflow (ILVI). Singleton fetuses were instrumented at ∼120 days gestational age (dGA; term is ∼147 days) with vascular catheters, an aortic flow probe and a deflated left atrial balloon. Balloons in ILVI fetuses were inflated over the 8 day study until aortic output was eliminated; Sham balloons remained deflated. At the study end-point (∼134 dGA), cardiac function was assessed by echocardiography, microvascular perfusion of each free wall was measured by myocardial contrast echocardiography (MCE) and terminal morphometric data were collected. During the chronic study, flow through the ascending aorta of ILVI fetuses fell from 389 to -48 mL min
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