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Biomedical subjects

G Balaguer

Publications and source records attributed to G Balaguer.

12 recordsLinked to original sources
PubMed1995

Effect of oral calcidiol treatment on its serum levels and peritoneal losses.

OBJECTIVES: To evaluate calcidiol serum levels in a group of continuous ambulatory peritoneal dialysis (CAPD) patients and the effect of oral calcidiol treatment on serum levels and peritoneal losses. STUDY DESIGN: Twenty patients (13 female, 7 male) were studied for 12-60 months. Their ages ranged 22-72 years (mean 46 +/- 15). Serum calcidiol, total protein and urea were determined at baseline and after the administration per os of 0.133 mcg/day of calcidiol for 10 days. At the same time, calcidiol and total protein were measured in peritoneal effluent at baseline and at 5, 10, and 40 days after starting this treatment. RESULTS: A significant and direct correlation between the calcidiol dialysis/plasma ratio and the peritoneal protein losses was found, both before and 40 days after calcidiol administration when calcidiol serum levels were the lowest. As calcidiol serum levels rose to the normal range in the course of the study, peritoneal losses of this metabolite increased slightly and correlated with calcidiol serum levels and urea mass transfer coefficient (MTC); the significant correlation between calcidiol serum levels and peritoneal protein losses disappeared. CONCLUSIONS: When serum calcidiol levels are low, calcidiol peritoneal losses in patients on CAPD correlate with protein peritoneal losses. However, when serum calcidiol levels rise, the calcidiol peritoneal losses correlate with calcidiol serum levels and urea MTC, and not with protein peritoneal losses.

Administration, Oral↗
PubMed1991

25(OH)D levels in diabetic pregnancies relation with neonatal hypocalcemia.

The levels of 25(OH)D have been quantified in 42 insulin diabetic pregnancies (DP) through the three trimesters of pregnancy with a total of 177 determinations. In parallel we quantified this metabolite in 114 normal pregnant women (NP) and also in 116 normal controls (NC). In addition 25(OH)D was quantified in 18 (DP) and 19 (NP) at delivery in the 35-37th week of pregnancy, and ionic calcium was measured in their newborns at 24 h of life. Grouping by trimesters of gestation, the (NP) group had 25(OH)D levels similar to those of (NC) and none showed significant differences between trimesters of pregnancy. (DP) showed in all seasons lower (25(OH)D levels than (NC) but did not have differences in these levels between trimesters of pregnancy. The newborns of (DP) had lower ionic calcium levels than newborns of (NP). Eight newborns of (DP) had hypocalcemia and seven of their mothers showed 25(OH)D levels lower than 10 ng/ml. These findings suggest that lower 25(OH)D levels in (DP) can influence the neonatal hypocalcemia in their newborns.

Adult↗
PubMed1991

Osteocalcin levels in uremic patients: influence of calcitriol treatment through two different routes and type of dialysis.

Osteocalcin, the most abundant non-collagen protein of bone, is synthesized by the osteoblast. Serum osteocalcin concentration depends primarily on new cellular synthesis, and is a sensitive marker of bone turnover reflecting osteoblastic function. In uremic and hemodialysis (HD) patients, a direct relationship between serum osteocalcin and histological parameters of bone formation has been observed. The modality of dialysis may influence serum osteocalcin levels though the available data are controversial. The aim of this study is to assess the acute and chronic effects of calcitriol and the influence of modality of dialysis on serum osteocalcin levels. Twelve patients on continuous ambulatory peritoneal dialysis (CAPD) were treated with calcitriol. For control purposes, 24 patients, 12 on CAPD and 12 on HD, not treated with calcitriol serum osteocalcin levels were included. In CAPD patients previously treated with calcitriol, serum osteocalcin levels were higher than in nontreated patients. The higher levels occur independent of serum levels of parathyroid hormone (PTH), Ca and P. Hemodialysis patients had osteocalcin levels similar to those of CAPD patients under calcitriol treatment. However, the levels of HD patients were higher than CAPD nontreated patients. Serum ionized Ca was similar in CAPD and HD nontreated patients; however, total Ca was significantly higher in HD than in CAPD patients, both with and without calcitriol. After the intravenous administration of calcitriol, serum osteocalcin levels increased from 9.2 + 2.5 to 13.5 + 5.4 ng/ml (p less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)

Administration, Oral↗
PubMed1991

Comparative study between intact PTH and fragments of PTH in patients on hemodialysis and CAPD.

Twenty-nine patients on hemodialysis (HD) and 29 patients on continuous ambulatory peritoneal dialysis (CAPD) were studied. Serum calcium and phosphorous levels were similar in the 2 groups. Serum parathyroid hormone (PTH) levels were determined by 4 different methods. Mid-molecule PTH levels were higher in HD (1099.5 +/- 876.8 pmol/L) than in CAPD patients (541.0 +/- 138.8 pmol/L), p less than 0.001, while intact PTH levels were similar. The ratio MM-PTH/Intact PTH was higher in HD (55.2 +/- 29.0) than in CAPD patients (39.0 +/- 20.0), where p less than 0.01. In patients with similar C-PTH, those on CAPD had higher levels of intact PTH (46.0 +/- 27.0 pmol/L) than those in HD (29.3 +/- 29.0 pmol/L), p less than 0.01. The ratio C-PTH/intact PTH was higher in HD (104.9 +/- 39.6) than in CAPD patients (59.3 +/- 32.3), p less than 0.001. The Peritoneal Saturation Index (PSI) of MM-PTH was 23.4 +/- 12%, and it showed a hyperbolic correlation in respect to MM-PTH serum levels. We concluded that CAPD can modify the plasma C-PTH and MM-PTH serum levels by peritoneal losses of these fragments.

Humans↗
PubMed1988

[Parathyroid hormone: perinatal aspects].

Authors have measured parathormone levels in 28 mothers at delivery and their respective newborns at 40-50 hours after birth. They also quantified these levels in umbilical vessels. Control groups was formed by 48 healthy non pregnant women. PTH levels in pregnant women were similar to controls. In umbilical artery these values were higher than in umbilical vein and in both, lower than other groups. Newborns at 40-50 hours after birth showed higher PTH levels than controls and pregnant women at delivery. A positive correlation between the PTH levels of the mother and those of the umbilical vessels is found. PTH levels of the neonate at 40-50 hours after birth correlated with levels of umbilical artery and umbilical vein. They do not observe a hyperparathyroidism at the delivery, although there is a slight decrease in Ca levels. Newborns at 40-50 hours after birth did show an increase in their PTH levels in parallel with hypocalcemia correlation found between PTH levels of the mother and those of the umbilical vessels could suggest a placental transfer for this hormone.

Calcium↗
PubMed1987

[Levels of 25-hydroxycholecalciferol in human serum in all ages: seasonal differences].

The 25-hydroxycholecalciferol (25-HCC) levels have been quantified in 172 normal controls. Three groups were considered: children (0-12 years), younger than 50 year-old adults and older than 50 year-old adults. In order to evaluate the seasonal variations in this metabolite their levels throughout the year were quantified. A negative correlationship was observed between age and 25-HCC levels. Grouping the levels according to maximum and minimum solar irradiation, the children's group showed higher values than the other groups in both seasons, while younger group (under 50 years of age) showed higher levels than the older group only in maximum solar irradiation. The children's and younger people's groups showed significant differences in the 25-HCC levels between the period of maximum and minimum solar irradiation which did not occur in the older group. In our geographic area, age and seasons of the year are factors that may influence 25-HCC levels. Therefore knowledge of these factors is basic for understanding correctly these metabolite levels.

Adult↗
PubMed1986

Ionic calcium levels during pregnancy, at delivery and in the first hours of life.

Free calcium ion concentration (mmol/l) and pH were determined in whole blood using a semiautomatic electrode system (ICA-1 Radiometer, Copenhagen, Denmark) in 37 normal women, 90 pregnant women (30 from each trimester of gestation), 28 mothers at delivery and their respective newborns. The blood samples from normal controls, pregnant women, umbilical cord and 40-50-hour-old infants were collected anaerobically in vacuum tubes. Duplicate samples drawn from newborns shortly after birth by heel puncture were collected in special heparinized capillary tubes. We observed that Ca2+ concentrations in the second (1.20 +/- 0.04) and third (1.20 +/- 0.05) trimesters of pregnancy, and at delivery (1.18 +/- 0.05), were lower than in the control group (1.23 +/- 0.04). The [Ca2+] in samples from the umbilical vein (1.44 +/- 0.11) and artery (1.45 +/- 0.08) and from newborns 2-5 min after birth (1.34 +/- 0.12) was greater than in control samples. The [Ca2+] in newborns 40-50 hours after birth was lower (1.16 +/- 0.14) than in the control group.

Adult↗
PubMed1986

The effects of season and stage of pregnancy on 25-hydroxy-vitamin D levels in pregnant women in Madrid.

The influence of seasonal variations and gestation on 25(OH)D3 levels was studied in a group of women from Madrid, Spain, at different stages of pregnancy, during March and September. The objective was to observe the incidence of this climate and dietary factors. No variations were found in serum concentration of the metabolite throughout pregnancy in comparison with the controls, in either March or September. 25(OH)D3 values decreased after winter in both groups of women, although mean values were consistently higher than 16 ng/ml.

Calcifediol↗