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Biomedical subjects

H Cho

Publications and source records attributed to H Cho.

At least 199 records · Page 11Linked to original sources
PubMed1986

Scanning electron microscopy of the microvascular system in the inner ear.

In the present work, vessels casts in the inner ear of the rat and guinea pig, prepared by casting method using Mercox resin, were subjected to scanning electron microscopic examination and following results were obtained: In adult guinea pig, numerous capillary nets were found in the following parts: stria vascularis, spiral ligament, spiral prominence, Corti's organ, spiral ganglion, plexus cochlearis, semicircular ampulla, saccule, utricle, and endolymphatic sac. These were consistent with functionally and morophologically important areas in the inner ear. In the central side of the area with capillary nets, arterioles were found to run throughout, like a complex coil, and peripheral capillary diameter was found to be unchanged in an experiment in which the injection pressure was altered, thus autoregulation of blood flow into these important areas is assumed. Vessels in the planum semilunatum were found to form a specific loop-shaped route, where secretion and reabsorption of endolymph is thought to occur. After kanamycin injection into the tympanic cavity, stenosis was observed in capillary nets in the cochlear lateral wall. In guinea pigs on the 30th day of fetal life, the main stem of the inner ear vessel had already formed; however, the peripheral capillary nets were as yet immature in form and vessel density was low.

Alprostadil↗
PubMed1985

Tuberous sclerosis: report of two cases studied by computer-assisted cranial tomography within one week after birth.

Two neonates with tuberous sclerosis are reported. The patients presented convulsive seizures 30 mins or 5 days after birth. Computer-assisted cranial tomography (CT) on admission showed typical paraventricular calcifications in Case 1 and a calcified mass in Case 2. In addition to the CT findings, the diagnosis was made on the basis of the depigmented skin, and the mother with tuberous sclerosis in Case 1 and the pathological findings after surgery in Case 2. The importance of CT as a diagnostic procedure for this disease within 1 wk after birth is emphasized.

Brain↗
PubMed1985

Salivary testosterone concentration and testicular volume in male infants.

In order to investigate the changes in testicular volumes (TV) and salivary testosterone concentrations (ST) in normal male infants aged from birth to one year, TV in 158 and ST in 61 infants were measured cross-sectionally during this period. ST of normal male adolescents in Tanner's public hair stage from P2 to P5 (n = 20) were also measured as the control. To clarify the relationship between remarkable height increase and testosterone (T) during early male infancy, longitudinal follow-up of 10 male infants (4 from birth to 4 months, 6 from birth to 7 months) were also carried out by simultaneous measurement of ST and crown-heel length. Maximum TV (ml) was observed at 1-4 months (1.7 +/- 0.6) (mean +/- SD) and was significantly higher than the values at birth (0.5 +/- 0.1, P less than 0.01) and at 6-12 months of age (1.4 +/- 0.4, P less than 0.01). Maximum St (ng/dl) was also observed at 1-4 months, with the mean value being 3.4 +/- 1.5, which was significantly higher than 1.9 +/- 0.8 at 6-12 months (P less than 0.01). The ST at four month was not significantly different from that at Tanner's pubic hair stage P2. The longitudinal study showed that the rise in ST was concomitant with the maximum increase in crown-heel length at 1-4 months. The fluctuations in ST and height increase were also apparently synchronous during the first year.

Growth↗