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Stable Control of Physiological Parameters, But Not Infection, in Preterm Lambs Maintained on Ex Vivo Uterine Environment Therapy
Author(s) -
Miura Yuichiro,
Usuda Haruo,
Watanabe Shimpei,
Woodward Eleanor,
Saito Masatoshi,
Musk Gabrielle C.,
Kallapur Suhas G.,
Sato Shinichi,
Kitanishi Ryuta,
Matsuda Tadashi,
Newnham John P.,
Stock Sarah J.,
Kemp Matthew W.
Publication year - 2017
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/aor.12974
Subject(s) - fetus , medicine , gestational age , fetal surgery , umbilical cord , ex vivo , amniotic fluid , saline , umbilical artery , hysterotomy , anesthesia , pregnancy , surgery , in vivo , biology , in utero , anatomy , genetics , microbiology and biotechnology
Ex vivo uterine environment (EVE) therapy is an experimental neonatal intensive care strategy wherein gas exchange is performed by membranous oxygenators attached to the umbilical vessels. Our aim was to assess the ability of a newly refined EVE system to maintain key physiological parameters in preterm lambs within optimal ranges for 48 h. EVE group; n = 6: Preterm lambs were delivered under general anesthesia at 115 ± 2 days of gestational age. Animals were submerged in a bath of artificial amniotic fluid on EVE therapy for 48 h. Physiological parameters were monitored in real‐time over the length of the experiment. Control group; n = 11: Ewes carrying a single fetus (115 ± 2 days of gestational age) underwent recovery surgery to allow placement of a fetal carotid artery catheter. Fetuses received an infusion of sterile saline only. After euthanasia, EVE and Control group fetuses underwent necroscopy to perform static pressure–volume curves and for sampling of lung and cord blood plasma for molecular analyses. Five out of six fetuses in the EVE group completed the study period with key physiological variables remaining within their respective reference ranges for the duration of the 48 h study. Bacteremia was identified in four out of five EVE fetuses, and was associated with a systemic inflammatory response. Using our refined EVE therapy platform, preterm lambs were maintained in a stable physiological condition for 48 h. These findings represent a significant advance over earlier work with this system; however, the identification of bacteremia and a fetal inflammatory response suggests that further refinement to the EVE therapy platform is required.