Biomedical subjects

Ichiro Kawabata

Publications and source records attributed to Ichiro Kawabata.

3 recordsLinked to original sources

PubMed2004

Uterine contractions might increase heart preload in the recipient fetus in early-onset twin-twin transfusion syndrome: an ultrasound assessment.

OBJECTIVES: Uterine contractions (UC) in twin pregnancy are often experienced, yet the effects of UC in twin-twin transfusion syndrome (TTTS) remain to be clarified. The recipient heart preload condition and the effects of UC were evaluated and the final objective was to clarify the effects of tocolysis. METHODS: Firstly, the preload indexes (PLIs) and cardiothoracic area ratios (CTARs) were analyzed on both fetuses of 10 TTTS cases, aged from 14 to 28 gestational weeks in stage III/IV cases for evaluating the preload condition. Then, the PLIs in the presence and absence of UC in the recipient fetuses were determined to evaluate the difference. RESULTS: The PLIs of the recipient and the donor fetuses were 0.78 +/- 0.34 (n = 163) and 0.35 +/- 0.13 (n = 71) respectively. The CTARs were 30.2 +/- 6.1 (n = 62) and 23.4 +/- 5.4 (n = 62) respectively. The PLIs in the absence and presence of UC in the recipient fetuses were 0.69 +/- 0.29 and 0.99 +/- 0.38 (n = 35). All above comparisons showed highly significant differences (p < 0.0001). CONCLUSION: The recipient fetuses have signs of cardiac dilatation and a high-preload condition. UC transiently further raises high-preload conditions of the recipient fetus. Thus, tocolysis may be necessary for management in cases of early-onset severe TTTS.

Dilatation, Pathologic↗

PubMed2003

MRI during pregnancy.

The use of ultrasonography (USG) during pregnancy provides a tremendous amount of valuable information about fetal and maternal well-being. However, in some cases the image quality may be poor due to maternal fat tissue, fetal position, or some other reason. Magnetic resonance imaging (MRI) can provide clear images from multiple angles without X-ray exposure. We believe that it is important to evaluate the usefulness of MRI for diagnostic purposes during pregnancy. While MRI can provide different information to what can be obtained from USG, it is not always superior to USG. The clinical indications for MRI during pregnancy are limited but well defined. Fetal MRI is a valuable complement to USG especially in the further evaluation of problems first detected by USG. When MRI is performed, we must consider its purpose and accordingly determine the appropriate procedure to provide the most precise and useful diagnostic information.

Congenital Abnormalities↗

PubMed2002

Leptin as an acute stress-related hormone in the fetoplacental circulation.

OBJECTIVE: To investigate the relationship between fetoplacental leptin secretion and blood gases. METHODS: We measured the levels of umbilical arterial and venous leptin, umbilical cord gas, umbilical venous blood glucose, and estradiol-17beta (E2) in 89 pregnant women. Correlation between the leptin levels and other variables (gestational age, birth weight, maternal body weight, height, body mass index, maternal body weight gain, placental weight, umbilical cord gas data, and levels of umbilical venous blood glucose and E2) were examined statistically. RESULTS: Umbilical arterial and venous leptin levels were 7.64 +/- 12.76 and 7.76 +/- 13.17 (ng/mL), respectively, correlating positively with carbon dioxide pressure levels (r = 0.446, P <.001; r = 0.406, P <.001, respectively) and correlating inversely with pH (r = -0.337, P =.001; r = -0.247, P =.019, respectively). Umbilical venous glucose, E2, and other factors did not correlate with leptin levels. CONCLUSION: Leptin secretion into the fetoplacental circulation may be associated with fetal hypercapnia, suggesting two important roles for leptin: one for basal control of fetal fat tissue and one as an acute stress-related hormone.

Adult↗