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Biomedical subjects

V Caballero

Publications and source records attributed to V Caballero.

7 recordsLinked to original sources
PubMed1998

Premature luteal regression in goats superovulated with PMSG: effect of hCG or GnRH administration during the early luteal phase.

Twenty-two goats were superovulated with PMSG; 84 h after the onset of estrus the goats were treated with saline solution (control group n = 7), hCG (hCG group, n = 7), or GnRH (GnRH group, n = 8). The ovaries of all the goats were laparoscopically examined 3 and 6 d after the onset of estrus. In each case the CL were counted and classified according to their appearance as normal-looking or as regressing. Blood samples for progesterone determination were collected every 12 h from Day 1 to Day 6. Premature luteal regression was considered to have occurred if progesterone concentrations declined to less than 1 ng/mL by Day 6. According to progesterone concentrations, 57.5, 0 and 37.5% of the goats underwent premature luteal regression in the control, hCG and GnRH groups, respectively. Progesterone concentrations were higher in the hCG group than in the other groups on Days 5 and 6 post estrus (P < 0.05). The control group was the only one in which there was a significant (P < 0.05) increase in the number of regressing CL between Day 3 (1.6 +/- 1.4) and Day 6 (7.3 +/- 1.4). It was also the only group in which there was a significant decrease in the number of normal-looking CL between Day 3 (12.6 +/- 2.1) and Day 6 (2.6 +/- 2.1). On Day 6 the animals treated with hCG had significantly more normal-looking CL (12.0 +/- 2.3) than those in the control group (2.6 +/- 2.1). The number of large follicles present on the ovaries on Day 6 post estrus had negative correlations with progesterone concentrations (P = 0.05) and with the number of normal-looking CL (P < 0.05). It is concluded that the administration of hCG 84 h after the onset of estrus prevents premature luteal regression in goats superovulated with PMSG.

Animals↗
PubMed1996

SUNCT syndrome: duration, frequency, and temporal distribution of attacks.

Duration, frequency, and temporal distribution of attacks have been objectively estimated in 11 SUNCT patients (3 women and 8 men). The mean age at the time of the study was 69 years (range 52 to 81). The duration of a total of 348 attacks was measured from videotape records, polygraphic tracings, or by stopwatch. The duration of attacks ranged from 5 to 250 seconds, with an unweighted mean of 61 seconds. Both frequency and exact timing of attacks were assessed in four patients who filled in a time chart with the exact onset of 585 consecutive attacks. The majority of attacks occurred during daytime, with a bimodal distribution; ie, morning and afternoon/evening peaks, and only a few attacks were noted at night (ie, 1.2% of the attacks). The unweighted mean frequency of attacks was 28 per day (range 6 to 77). Duration and timing of attacks in SUNCT syndrome may be of help in the differential diagnosis versus other disorders with the same localization, especially first division trigeminal neuralgia.

Aged↗
PubMed1994

SUNCT syndrome: repetitive and overlapping attacks.

A 79-year-old patient had been suffering from right orbital pain attacks since he was 77. The pain, of an "electrical" or burning character, was moderate to severe in intensity. Single attacks lasted for 30-60 seconds each and were accompanied by prominent ipsilateral conjunctival injection and tearing as well as slight rhinorrhoea. The temporal pattern of attacks was irregular with spontaneous remissions alternating with unpredictable symptomatic phases. During active periods, attacks could be triggered by several precipitants acting on trigeminal and extra-trigeminal innervated areas. On most occasions, the patient had 2-3 attacks daily but, at worst, he might have almost continuous short-lasting attacks in periods of 1 to 3 hours length. When attacks had such frequency they presented either as repetitive or overlapping single episodes. According to the clinical features it is concluded that the case reported is a new case of SUNCT syndrome.

Aged↗
PubMed1988

Mitotic activity of the endothelial vascular cell in the immature retina.

We studied the ultrastructural characteristics of the mitoses of the retinal vascular endothelium during normal vasculogenesis in the immature retina of 45 newborn albino rats, from birth to the end of the 1st month of postnatal development. For the first time mitotic phenomena in the endothelial cells to the adjacent endothelium during all mitosis stages. Direct budding from the pre-existing vessels seems to be the actual mechanism of growth of the retinal vessels in the holangiotic immature retina.

Animals↗
PubMed1988

Ultrastructural study of a retinoma by intraocular fine-needle aspiration biopsy.

The authors present the results of a transmission electron-microscopic study performed on a tissue sample obtained by an intraocular fine-needle aspiration biopsy in a case of retinoma. The ultrastructural study showed that the tumor was composed mainly of granular osmiophilic material which contained some tumor cells. These cells showed peculiar ultrastructural characteristics, which demonstrated their neural character, and appeared in different degenerative stages. Apparently, this is the first case in whom ultrastructural technique have been applied to study an intraocular tumor sample obtained by intraocular fine-needle aspiration biopsy, and the first case of retinoma studied by such a diagnostic approach.

Biopsy, Needle↗
PubMedDate not supplied

SUNCT syndrome. Statuslike pattern.

Four SUNCT patients with a clinical "SUNCT status" witnessed by the investigators are reported. Such an extreme aggregation of typical attacks lasting for the better part of the day, 1 to 3 days in a row has not previously been observed. Appropriate supplementary examinations ruled out an intracranial lesion in all four patients. Indeed, an observation period of more than 5 years speaks against a symptomatic etiology of SUNCT in these cases. Although rarely seen, clinical status may be a feature of the SUNCT syndrome.

Aged↗