Biomedical subjects

R A Ajayi

Publications and source records attributed to R A Ajayi.

10 recordsLinked to original sources

PubMed2003

Poor acceptance rate for semen donors to a private cryobank in Nigeria.

A retrospective analysis of sixty one prospective donors who visited the cryobank in person from August 1999 to December 2001 was done. The study evaluated the acceptance rate of prospective semen donors and semen characteristics in order to assess the fertility potential of the supposedly normal population of young men. The outcome of the various screening processes--history taking, infection screening, blood grouping and Hb genotype assessment, semen analyses (pre-freeze and post-thaw), and post-quarantine (six months after production of last sample) infection--was analysed. Out of the 61 enquiries, 9 (14.8%) donors were recruited, 7 (77.8%) of whom were less than 25 years old. Fourteen (22.9%) donors had sperm concentrations greater than 60' 10(6) ml, 31 (50.8%) had motility greater than 60% and 17 (27.8%) had normal forms greater than 30%. Six (9.8%) of the donors were unable to masturbate and thus were disqualified, while only one donor (6.1%) failed to show up for a re-test after the completion of the quarantine period. Twenty one (38.2%) donors had low semen values based on the WHO reference value. We conclude that a high proportion of prospective semen donors may have suboptimal semen parameters, and that using strict criteria, poor acceptance rates for donors is observed in a semen donation programme.

Adult↗

PubMed2003

Live births after intracytoplasmic sperm injection in the management of oligospermia and azoospermia in Nigeria.

Intracytoplasmic sperm injection has revolutionised the management of male infertility. We report two cases that demonstrate the successful application of this technology in Nigeria in the management of both oligospermia and azoospermia. The first case relates to the treatment of a 31-year-old woman who required intracytoplasmic sperm injection of her husband's sperm for the treatment of both tubal fertility and male infertility. She had three embryos transferred on 9th June 1999 and was delivered of healthy male and female infants by caesarean section in January 2000 at 33 weeks gestation. The second case describes a 38-year-old woman who required intracytoplasmic sperm injection of the husband's surgically collected sperm for the management of azoospermia. She had two embryos transferred on 16th December 1999 and was delivered of a healthy male infant by caesarean section on 19th July 2001.

Adult↗

PubMed1995

Ultrasound diagnosis of the Pena Shokeir phenotype at 14 weeks of pregnancy.

This report describes the early prenatal diagnosis of the Pena Shokeir phenotype in an at-risk patient at 14 weeks' gestation. The diagnosis was based on an abnormal fetal movement profile, in association with an abnormal position of the fetal limbs. Pena Shokeir phenotype describes an inherited condition characterized by arthrogryposis and dysmorphic features as a result of fetal akinesia. It is a lethal abnormality and early diagnosis allows safer surgical methods of termination.

Abnormalities, Multiple↗

PubMed1995

Fetal oxygenation at cordocentesis, maternal smoking and childhood neuro-development.

OBJECTIVE: To assess the relationship between subsequent neuro-development and measurements in small for gestational age (SGA) fetuses, including oxygenation at cordocentesis. DESIGN: A longitudinal study of a cohort of SGA fetuses using those with normal oxygenation as controls. SUBJECTS: 65 chromosomally normal children aged 12-66 months who, as fetuses, had been small for gestational age, had undergone cordocentesis and had been delivered after 32 weeks' gestation. RESULTS: Griffiths' developmental quotient (DQ) was significantly associated with fetal blood pH (r = 0.41, P = 0.0008), PO2 (r = 0.25, P = 0.047) and PCO2 (r = -0.28, P = 0.027) at cordocentesis but not with the severity of growth retardation (r = 0.18, P = 0.17). However, the significant correlations between DQ and both PO2 and PCO2 were explained by their co-correlations with pH and neither remained significant after removing the effect of pH by analysis of variance. The association between DQ and pH was still significant after removing the effect of confounding variables. Maternal smoking during pregnancy was significantly associated with DQ (F to remove = 6.89, P = 0.011) even after allowing for the effects of possible confounding variables including fetal blood pH. CONCLUSIONS: Both fetal pH at cordocentesis and maternal smoking correlate significantly with subsequent neuro-development. Further investigation into the causes of these associations is required.

Child, Preschool↗

PubMed1993

Prediction of morbidity in small and normally grown fetuses by fetal heart rate variability, biophysical profile score and umbilical artery Doppler studies.

OBJECTIVE: To assess the ability of noninvasive tests of fetal wellbeing to predict hypoxic morbidity independent of fetal size. DESIGN: A prospectively planned, longitudinal, observational study. SETTING: Fetal Surveillance Unit, King's College Hospital, London. SUBJECTS: One hundred and ninety-one pregnant women with singleton pregnancies who were delivered after 32 weeks' gestation who were seen in the Fetal Surveillance Unit within seven days of delivery. INTERVENTIONS: Fetal surveillance by fetal abdominal circumference, heart rate variability (mean range), biophysical profile score and umbilical artery pulsatility index measurements. MAIN OUTCOME MEASURES: Birthweight was classified as > or < or = 2.5th centile (AGA or SGA) for gestational age and sex. Morbidity was defined as at least one of the following at birth: delivery by emergency caesarean section for fetal distress, umbilical venous blood pH less than 7.15, 5 min Apgar score less than 7 or admission to the Special Care Baby Unit (SCBU). RESULTS: Fetal abdominal circumference was the best indicator of which fetuses (n = 30) would be SGA. Fourteen of the 30 (47%) SGA fetuses had morbidity at birth and abnormal umbilical Doppler studies significantly predicted this (chi 2 = 2.93, P = 0.003). By contrast, fetal heart rate variability and the biophysical profile score did not. Twenty-seven of the 161 (17%) AGA fetuses had morbidity at birth, but this was not significantly predicted by heart rate variability, biophysical profile score or umbilical Doppler studies. CONCLUSIONS: None of the antenatal testing techniques studied predicted morbidity in normally grown fetuses but Doppler studies indicated whether a small fetus was 'sick small' or 'normal small'.

Blood Flow Velocity↗

PubMed1992

Relationship between fetal acidemia at cordocentesis and subsequent neurodevelopment.

To determine whether there is a relationship between chronic fetal acidemia and subsequent neurodevelopment, a follow-up study was undertaken of 36 children with normal karyotype and morphology, who had prenatal cordocentesis for severe growth retardation. The main outcome measure was the Griffiths neurodevelopmental quotient. The children who had acidemia as fetuses (n = 13) had a significantly lower developmental quotient (mean = 91.8, SD = 6.3) than those with normal (n = 23) fetal blood pH (mean = 100.3, SD = 10.3; t = -2.68, p = 0.011). There was also a significant correlation between developmental quotient and the degree of fetal acidemia (r = 0.41, n = 36, p = 0.012). The pregnancies with acidemic fetuses had similar epidemiological characteristics to those with fetuses with a normal pH, except for a higher incidence of smoking. There was no significant correlation between the degree of growth retardation (birth weight expressed as multiples of SD from the mean for gestational age and sex) and fetal acidemia (r = -0.23, n = 36, NS) or subsequent Griffiths developmental quotient (r = -0.005, n = 36, NS). The results show an association between chronic fetal acidemia and subsequent impaired neurodevelopment. This observation suggests that future preventative interventions may be possible.

Journal Article↗

PubMed1992

A comparison between computerised (mean range) and clinical visual cardiotocographic assessment.

OBJECTIVE: To compare computer cardiotocographic (CTG) analysis with clinical visual analysis. DESIGN: A retrospective blind comparison of the two techniques of CTG assessment. SETTING: Fetal Assessment Unit, King's College Hospital, London. SUBJECTS: One hundred CTG traces of women referred to the unit were studied; the traces were taken after 32 weeks' gestation, within 10 days of delivery and where outcome was known. INTERVENTIONS: The CTG traces were assessed both by the computer (System 8000 computerised CTG analyser, Oxford Sonicaid Ltd) and visually, by one of us. MAIN OUTCOME: Computer mean range from 0 to 80 in ms clinical visual CTG score from 0 to 80 (arbitrary units). A score < 20 is ominous; suspicious when between 20 and 30; and normal when > 30. RESULTS: There was close correlation between the computer mean range and clinical visual assessment (r = 0.78, n = 100, P = 0.001). However, there were 13 occasions where the computer classified the trace as abnormal when clinical visual assessment was normal, indicating computer false positives. All these pregnancies had normal outcomes. There were no traces where computer analysis was normal and clinical visual assessment abnormal. CONCLUSIONS: Computerised CTG analysis gives an objective assessment which agrees closely with experienced visual assessment. It also provides a number which can be used to assess the value of fetal heart rate analysis.

Cardiotocography↗

PubMed1992

Antenatal testing to predict outcome in pregnancies with unexplained antepartum haemorrhage.

OBJECTIVE: To investigate whether Doppler studies of placental perfusion and antenatal tests for fetal hypoxia can identify reduced placental functional reserve in women with unexplained antepartum haemorrhage (APH). DESIGN: A prospective, longitudinal study. SETTING: Fetal Surveillance Unit, King's College Hospital, London. SUBJECTS: 48 women with bleeding from the genital tract after 26 weeks gestation without a clinical diagnosis of abruption or ultrasound evidence of placenta praevia. INTERVENTIONS: Fetal surveillance by Doppler measurements of the umbilical and uterine arteries, biophysical profile scoring and computerized measurement of the mean minute range of FHR variation. MAIN OUTCOME MEASURES: A poor outcome was defined by one or more of the following: (i) birthweight greater than 2SD below the normal mean for gestational age and sex, (ii) abnormal FHR pattern in labour resulting in operative delivery, (iii) umbilical vein blood pH at delivery less than 7.15, (iv) a 5-min Apgar score less than 7. RESULTS: Fifteen of the 48 pregnancies had a poor outcome; seven occurred in the 10 women delivered preterm (less than 37 weeks) and eight in the 36 women delivered between 37 and 42 weeks. Two women were delivered after 42 weeks and both infants had a good outcome. The results of Doppler studies of uterine and umbilical arteries, fetal biophysical profile or FHR variation were not significantly different between the two outcome groups. The 36 pregnancies delivered between 37 and 42 weeks were matched retrospectively for maternal age, parity and race with 36 pregnancies without APH; there was no significant difference in outcome between the women with unexplained APH and the matched comparison group. CONCLUSION: Morbidity related to unexplained APH is associated with preterm delivery rather than with damage to utero-placental function.

Female↗

PubMed1991

Ultrasound assessment of amniotic fluid volume: a comparison of the single deepest pool and amniotic fluid index to predict perinatal morbidity.

The ability of the amniotic fluid index and the single deepest pool to predict perinatal morbidity was compared in 291 high-risk singleton pregnancies without ruptured membranes or fetal renal abnormalities. A poor outcome was defined as a birth weight < -2 standard deviations, emergency Cesarean section for fetal heart rate abnormalities in labor, 5-minute Apgar score < 7, umbilical venous pH at delivery < 7.15 and admission to the special care baby unit. At least one of these parameters occurred in 71 (24%) of the 291 pregnancies. Oligohydramnios (an amniotic fluid index 5 cm (chi(2) = 2.41, p = 0.02). There was a significant correlation between amniotic fluid index and single deepest pool measurements (r = 0.83, n = 291, p < 0.0001). At the recommended cut-off values, the single deepest pool and the amniotic fluid index had sensitivities of 7% and 13%, respectively and specificities of 96% and 95% for predicting perinatal morbidity. Receiver operating characteristic curve analysis showed that these poor results were not the result of the cut-off values chosen and that the performances of the amniotic fluid index and single deepest pool were similar.

Journal Article↗

PubMedDate not supplied

Fetal biochemistry in growth retardation.

A substantial proportion of fetuses with severe early onset growth retardation are chromosomally abnormal and in these cases detailed ultrasound scanning will often demonstrate the presence of fetal anatomical defects. Chromosomally normal SGA fetuses with no biochemical abnormalities are likely to be normal small fetuses and seem to develop normally. SGA fetuses with evidence of impaired placental perfusion such as altered fetal cardiovascular dynamics and disturbances in biochemical, haematological, metabolic and endocrine status are at increased of neurodevelopmental delay. Although incomplete, the data collected so far suggest the biochemical changes may be caused by reduced placental transfer of nutrients (e.g. oxygen, glucose and essential amino-acids) and subsequent reduced fetal metabolism leading to high levels of substrates (e.g. triglycerides and non-essential amino-acids) and low levels of tissue products (e.g. thyroid hormone, insulin, platelets and white cells).

Female↗