Publications

Export 217 results:
Sort by: Author Title [ Type  (Asc)] Year
Journal Article
Odetoyin, BW, Labar AS, Lamikanra A, Aboderin AO, Okeke IN.  2017.  Classes 1 and 2 Integrons in Faecal {{Escherichia}} Coli Strains Isolated from Mother-Child Pairs in {{Nigeria}}, aug. PLOS ONE. 12(Nübel, Ulrich, Ed.).:e0183383., Number 8: {Public Library of Science} Abstract

Background Antimicrobial resistance among enteric bacteria in Africa is increasingly mediated by integrons on horizontally acquired genetic elements. There have been recent reports of such elements in invasive pathogens across Africa, but very little is known about the faecal reservoir of integron-borne genes. Methods and findings We screened 1098 faecal Escherichia coli isolates from 134 mother-child pairs for integron cassettes by PCR using primers that anneal to the 5' and 3' conserved ends of the cassette regions and for plasmid replicons. Genetic relatedness of isolates was determined by flagellin and multi-locus sequence typing. Integron cassettes were amplified in 410 (37.5%) isolates and were significantly associated with resistance to trimethoprim and multiple resistance. Ten cassette combinations were found in class 1 and two in class 2 integrons. The most common class 1 cassette configurations were single aadA1 (23.4%), dfrA7 (18.3%) and dfrA5 (14.4%). Class 2 cassette configurations were all either dfrA1-satIaadA1 (n = 31, 7.6%) or dfrA1-satI (n = 13, 3.2%). A dfr cassette was detected in 294 (31.1%) of trimethoprim resistant strains and an aadA cassette in 242 (23%) of streptomycin resistant strains. Strains bearing integrons carried a wide range of plasmid replicons of which FIB/Y (n = 169; 41.2%) was the most frequently detected. Nine isolates from five different individuals carried the dfrA17-aadA5-bearing ST69 clonal group A (CGA). The same integron cassette combination was identified from multiple distinct isolates within the same host and between four mother-child pairs. Conclusions Integrons are important determinants of resistance in faecal E. coli. Plasmids in integroncontaining strains may contribute to dispersing resistance genes. There is a need for

Abidoye, I, Ayoola O, Idowu B, Aderibigbe A, Loto O.  2017.  Uterine artery Doppler velocimetry in hypertensive disorder of pregnancy in Nigeria, 2017/12/29. 17 Abstract

Aim of the study: To evaluate the value of uterine artery Doppler indices and waveformpattern in predicting fetuses at risk for intrauterine growth restriction in hypertensive
disorders of pregnancy. Materials and methods: This was a prospective cross-sectional
study including 80 pregnant subjects with hypertensive disorders of pregnancy and two
control groups. Uterine artery Doppler sonography was performed in all study participants.
Uterine artery Doppler indices across the groups were compared using the analysis
of variance (ANOVA) while the presence of prediastolic notch was analyzed with the Chi
Square test. Results: For the hypertensive disorders of pregnancy group, resistivity index
> 0.66 had a sensitivity of 50.0%, specificity of 69.1% and a positive predictive value of
22.2% for predicting intrauterine growth restriction. The odds ratio was 2.2 with a 95%
confidence interval of 0.6–7.8. The presence of prediastolic notching had a sensitivity of
100.0%, specificity of 96.0% and a positive predictive value of 80.0% for predicting intrauterine
growth restriction. The odds ratio was 22.7 with a 95% confidence interval of
7.5–68.5. Conclusion: Uterine artery Doppler sonography is useful for predicting fetuses
at risk for intrauterine growth restriction in hypertensive disorder of pregnancy. Prediastolic
notching is more sensitive and more specific than uterine artery resistivity index in
predicting fetuses at risk of intrauterine growth restriction in established hypertensive
disorder of pregnancy.

Soyoye, D, Ayandele CO, Anizor C, Owolabi F, Ala O, Yusuff O, Ezekpo O, Lawal-Bello A, Adewusi T, Ikem R, Kolawole B.  2017.  Burden of obesity and hypertension in Nigerians with type 2 diabetes mellitus seen in a tertiary health facility, 2017/10/20. Abstract
n/a
Adeoye, AM, Ovbiagele B, Kolo P, Appiah L, Aje A, Adebayo O, Sarfo F, Akinyemi J, Adekunle G, Agyekum F, Shidali V, Ogah O, Lackland D, Gebregziabher M, Arnett D, Tiwari HK, Akinyemi R, Olagoke OO, Oguntade AS, Olunuga T, Uwanruochi K, Jenkins C, Adadey P, Iheonye H, Owolabi L, Obiako R, Akinjopo S, Armstrong K, Akpalu A, Fakunle A, Saulson R, Aridegbe M, Olowoyo P, Osaigbovo G, Akpalu J, Fawale B, Adebayo P, Arulogun O, Ibinaiye P, Agunloye A, Ishaq N, Wahab K, Akpa O, Adeleye O, Bock-Oruma A, Ogbole G, Melikam S, Yaria J, Ogunjimi L, Salaam A, Sunmonu T, Makanjuola A, Farombi T, Laryea R, Uvere E, Kehinde S, Chukwuonye I, Azuh P, Komolafe M, Akintunde A, Obiabo O, Areo O, Kehinde I, Amusa AG, Owolabi M.  2017.  Exploring Overlaps Between the Genomic and Environmental Determinants of LVH and Stroke: A Multicenter Study in West Africa, 2017. Global Heart. 12(2) Abstract

Background Whether left ventricular hypertrophy (LVH) is determined by similar genomic and environmental risk factors with stroke, or is simply an intermediate stroke marker, is unknown. Objectives We present a research plan and preliminary findings to explore the overlap in the genomic and environmental determinants of LVH and stroke among Africans participating in the SIREN (Stroke Investigative Research and Education Network) study. Methods SIREN is a transnational, multicenter study involving acute stroke patients and age-, ethnicity-, and sex-matched control subjects recruited from 9 sites in Ghana and Nigeria. Genomic and environmental risk factors and other relevant phenotypes for stroke and LVH are being collected and compared using standard techniques. Results This preliminary analysis included only 725 stroke patients (mean age 59.1 ± 13.2 years; 54.3% male). Fifty-five percent of the stroke subjects had LVH with greater proportion among women (51.6% vs. 48.4%; p < 0.001). Those with LVH were younger (57.9 ± 12.8 vs. 60.6 ± 13.4; p = 0.006) and had higher mean systolic and diastolic blood pressure (167.1/99.5 mm Hg vs 151.7/90.6 mm Hg; p < 0.001). Uncontrolled blood pressure at presentation was prevalent in subjects with LVH (76.2% vs. 57.7%; p < 0.001). Significant independent predictors of LVH were age <45 years (adjusted odds ratio [AOR]: 1.91; 95% confidence interval [CI]: 1.14 to 3.19), female sex (AOR: 2.01; 95% CI: 1.44 to 2.81), and diastolic blood pressure > 90 mm Hg (AOR: 2.10; 95% CI: 1.39 to 3.19; p < 0.001). Conclusions The prevalence of LVH was high among stroke patients especially the younger ones, suggesting a genetic component to LVH. Hypertension was a major modifiable risk factor for stroke as well as LVH. It is envisaged that the SIREN project will elucidate polygenic overlap (if present) between LVH and stroke among Africans, thereby defining the role of LVH as a putative intermediate cardiovascular phenotype and therapeutic target to inform interventions to reduce stroke risk in populations of African ancestry.

Adeoye, AM, Ogah OS, Ovbiagele B, Akinyemi R, Shidali V, Agyekum F, Aje A, Adebayo O, Akinyemi JO, Kolo P, Appiah LT, Iheonye H, Kelechukwu U, Ganiyu A, Olunuga TO, Akpa O, Olagoke OO, Sarfo FS, Wahab K, Olowookere S, Fakunle A, Akpalu A, Adebayo PB, Nkromah K, Yaria J, Ibinaiye P, Ogbole G, Olumayowa A, Lakoh S, Calys-Tagoe B, Olowoyo P, Innocent C, Tiwari HK, Arnett D, Godwin O, Ayotunde B, Akpalu J, Obiora O, Joseph O, Omisore A, Jenkins C, Lackland D, Owolabi L, Isah S, Dambatta AH, Komolafe M, Bock-Oruma A, Melikam ES, Imoh LC, Sunmonu T, Gebregziabher M, Olabisi O, Armstrong K, Onyeonoro UU, Sanya E, Agunloye AM, Ogunjimi L, Arulogun O, Farombi TH, Obiabo O, Obiako R, Owolabi M.  2017.  Prevalence and Prognostic Features of ECG Abnormalities in Acute Stroke: Findings From the SIREN Study Among Africans, 2017. Global Heart. 12(2) Abstract

Background Africa has a growing burden of stroke with associated high morbidity and a 3-year fatality rate of 84%. Cardiac disease contributes to stroke occurrence and outcomes, but the precise relationship of abnormalities as noted on a cheap and widely available test, the electrocardiogram (ECG), and acute stroke outcomes have not been previously characterized in Africans. Objectives The study assessed the prevalence and prognoses of various ECG abnormalities among African acute stroke patients encountered in a multisite, cross-national epidemiologic study. Methods We included 890 patients from Nigeria and Ghana with acute stroke who had 12-lead ECG recording within first 24 h of admission and stroke classified based on brain computed tomography scan or magnetic resonance imaging. Stroke severity at baseline was assessed using the Stroke Levity Scale (SLS), whereas 1-month outcome was assessed using the modified Rankin Scale (mRS). Results Patients' mean age was 58.4 ± 13.4 years, 490 were men (55%) and 400 were women (45%), 65.5% had ischemic stroke, and 85.4% had at least 1 ECG abnormality. Women were significantly more likely to have atrial fibrillation, or left ventricular hypertrophy with or without strain pattern. Compared to ischemic stroke patients, hemorrhagic stroke patients were less likely to have atrial fibrillation (1.0% vs. 6.7%; p = 0.002), but more likely to have left ventricular hypertrophy (64.4% vs. 51.4%; p = 0.004). Odds of severe disability or death at 1 month were higher with severe stroke (AOR: 2.25; 95% confidence interval: 1.44 to 3.50), or atrial enlargement (AOR: 1.45; 95% confidence interval: 1.04 to 2.02). Conclusions About 4 in 5 acute stroke patients in this African cohort had evidence of a baseline ECG abnormality, but presence of any atrial enlargement was the only independent ECG predictor of death or disability.

Owolabi, M, Sarfo F, Howard VJ, Irvin MR, Gebregziabher M, Akinyemi R, Bennett A, Armstrong K, Tiwari HK, Akpalu A, Wahab KW, Owolabi L, Fawale B, Komolafe M, Obiako R, Adebayo P, Manly JM, Ogbole G, Melikam E, Laryea R, Saulson R, Jenkins C, Arnett DK, Lackland DT, Ovbiagele B, Howard G.  2017.  Stroke in Indigenous Africans, African Americans, and European Americans: Interplay of Racial and Geographic Factors, 2017. Stroke. 48(5) Abstract

Background and Purpose - The relative contributions of racial and geographic factors to higher risk of stroke in people of African ancestry have not been unraveled. We compared stroke type and contributions of vascular risk factors among indigenous Africans (IA), African Americans (AA), and European Americans (EA). Methods - SIREN (Stroke Investigative Research and Educational Network) is a large multinational case-control study in West Africa - the ancestral home of 71% AA - whereas REGARDS (Reasons for Geographic and Racial Differences in Stroke) is a cohort study including AA and EA in the United States. Using harmonized assessments and standard definitions, we compared data on stroke type and established risk factors for stroke in acute stroke cases aged ≥55 years in both studies. Results - There were 811 IA, 452 AA, and 665 EA stroke subjects, with mean age of 68.0±9.3, 73.0±8.3, and 76.0±8.3 years, respectively (P<0.0001). Hemorrhagic stroke was more frequent among IA (27%) compared with AA (8%) and EA (5.4%; P<0.001). Lacunar strokes were more prevalent in IA (47.1%), followed by AA (35.1%) and then EA (21.0%; P<0.0001). The frequency of hypertension in decreasing order was IA (92.8%), followed by AA (82.5%) and then EA (64.2%; P<0.0001) and similarly for diabetes mellitus IA (38.3%), AA (36.8%), and EA (21.0%; P<0.0001). Premorbid sedentary lifestyle was similar in AA (37.7%) and EA (34.0%) but lower frequency in IA (8.0%). Conclusions - Environmental risk factors such as sedentary lifestyle may contribute to the higher proportion of ischemic stroke in AA compared with IA, whereas racial factors may contribute to the higher proportion of hypertension and diabetes mellitus among stroke subjects of African ancestry.

Zhu, Z, Ge T, Xiao M, Yuan H, Wang, T., Liu S, Atere CT, Wu J.  2017.  Belowground carbon allocation and dynamics under rice cultivation depends on soil organic matter content. Plant and Soil. 410:247–258.
Waitt, C, Diliiy Penchala S, Olagunju A, Amara A, Else L, Lamorde M, Khoo S.  2017.  Development, validation and clinical application of a method for the simultaneous quantification of lamivudine, emtricitabine and tenofovir in dried blood and dried breast milk spots using LC–MS/MS. J Chromatogr B Analyt Technol Biomed Life Sci. 1060:300-307. AbstractDownload (Open Access)

Objectives: To present the validation and clinical application of a LC–MS/MS method for the quantification of lamivudine (3TC), emtricitabine (FTC) and tenofovir (TFV) in dried blood spots (DBS) and dried breast milk spots (DBMS).

Methods: DBS and DBMS were prepared from 50 and 30 μL of drug-spiked whole blood and human breast milk, respectively. Following extraction with acetonitrile and water, chromatographic separation utilised a Synergi polar column with a gradient mobile phase program consisting of 0.1% formic acid in water and 0.1% formic acid in acetonitrile. Detection and quantification was performed using a TSQ Quantum Ultra triple quadrupole mass spectrometer. The analytical method was used to evaluate NRTI drug levels in HIV-positive nursing mothers-infant pairs.

Results: The assay was validated over the concentration range of 16.6–5000 ng/mL for 3TC, FTC and TFV in DBS and DBMS except for TFV in DBMS where linearity was established from 4.2–1250 ng/mL. Intra and inter-day precision (%CV) ranged from 3.5–8.7 and accuracy was within 15% for all analytes in both matrices. The mean recovery in DBS was >61% and in DBMS >43% for all three analytes. Matrix effect was insignificant. Median AUC0-8 values in maternal DBS and DBMS, respectively, were 4683 (4165–6057) and 6050 (5217–6417) ng h/mL for 3TC, 3312 (2259–4312) and 4853 (4124–6691) ng h/mL for FTC and 1559 (930–1915) and 56 (45–80) ng h/mL for TFV. 3TC and FTC were quantifiable (>16.6 ng/mL) in DBS from 2/6 and 1/6 infants respectively whereas TFV was undetectable in all infants.

Conclusions: DBS and DBMS sampling for bioanalysis of 3TC, FTC and TFV is straightforward, robust, accurate and precise, and ideal for use in low-resource settings.

Neary, M, Lamorde M, Olagunju A, Darin KM, Merry C, Byakika-Kibwika P, Back DJ, Siccardi M, Owen A, Scarsi KK.  2017.  The Effect of Gene Variants on Levonorgestrel Pharmacokinetics when Combined with Antiretroviral Therapy containing Efavirenz or Nevirapine. Clinical Pharmacology & Therapeutics . (DOI: 10.1002/cpt.667) AbstractJournal Website

Reduced levonorgestrel concentrations from the levonorgestrel contraceptive implant was previously seen when given concomitantly with efavirenz. We sought to assess whether single nucleotide polymorphisms (SNPs) in genes involved in efavirenz and nevirapine metabolism were linked to these changes in levonorgestrel concentration. SNPs in CYP2B6, CYP2A6, NR1I2 and NR1I3 were analysed. Associations of participant demographics and genotype with levonorgestrel pharmacokinetics were evaluated in HIV-positive women using the levonorgestrel implant plus efavirenz- or nevirapine-based ART, in comparison to ART-naïve women using multivariate linear regression. Efavirenz group: CYP2B6 516G>T was associated with lower levonorgestrel log10 Cmax and log10 AUC. CYP2B6 15582C>T was associated with lower log10 AUC. Nevirapine group: CYP2B6 516G>T was associated with higher log10 Cmax and lower log10 Cmin . Pharmacogenetic variations influenced subdermal levonorgestrel pharmacokinetics in HIV-positive women, indicating that the magnitude of the interaction with non-nucleoside reverse transcriptase inhibitors (NNRTIs) is influenced by host genetics.

Shacklett, BL, Derdeyn CA, Folayan MO, Landovitz RJ, Anthony C, Behrens A-J, Hope TJ, Landais E, Leal L, Marrazzo JM, Morris L, Mugo N, Ngure K, Noseda V, Ranasinghe S, Tully DC, Voronin Y, Warren M, Wibmer CK, Xie IY, Scarlatti G, Thyagarajan B.  2017.  HIVR4P 2016, partnering for prevention: conference summary and highlights. . AIDS Research and Human Retroviruses Journal . :.doi:10.1089/AID.2017.0125.
L.J.J, G, T.D B, P.A M, M.A E, W.L A, B A, P D, F.K.N A, P A, O J, P T, R B, A.A O, G P-R, S O-Y, F A, P.E H-W, T H, J.C M, A B.  2017.  The prevalence, penetrance and expressivity of etiologic IRF6 variants in orofacial clefts patients from sub-Saharan Africa. Molecular Genetics Genomic Med.. 5(2):164-171.
Liversidge, HM, Peariasamy K, Folayan MO, Adeniyi AA, Ngom PI, Mikami Y, Shimada Y, Kuroe K, Tvete IF, Kvaa SI.  2017.  A radiographic study of the mandibular third molar root development in different ethnic groups. Journal of Forensic Odonto-Stomatology . 35(2):103-114.
Odetoyin, BW, Labar AS, Lamikanra A, Aboderin AO, Okeke IN.  2017.  Classes 1 and 2 integrons in faecal Escherichia coli strains isolated from mother-child pairs in Nigeria. PloS one. 12:e0183383., Number 8: Public Library of Science Abstract
n/a
Olasehinde, O, Boutin-Foster C, Alatise OI, Adisa AO, Lawal OO, Akinkuolie AA, Adesunkanmi A-RK, Arije OO, Kingham TP.  2017.  Developing a breast cancer screening program in Nigeria: evaluating current practices, perceptions, and possible barriers. Journal of global oncology. 3:490–496., Number 5: American Society of Clinical Oncology Abstract
n/a
Olasehinde, O, Boutin-Foster C, Alatise OI, Adisa AO, Lawal OO, Akinkuolie AA, Adesunkanmi A-RK, Arije OO, Kingham TP.  2017.  Developing a breast cancer screening program in Nigeria: evaluating current practices, perceptions, and possible barriers. Journal of global oncology. 3:490–496., Number 5: American Society of Clinical Oncology Abstract
n/a
Olasehinde, O, Boutin-Foster C, Alatise OI, Adisa AO, Lawal OO, Akinkuolie AA, Adesunkanmi A-RK, Arije OO, Kingham TP.  2017.  Developing a breast cancer screening program in Nigeria: evaluating current practices, perceptions, and possible barriers. Journal of global oncology. 3:490–496., Number 5: American Society of Clinical Oncology Abstract
n/a
Aransiola, EF, Ige OA, Ehinmitola EO, Layokun SK.  2017.  Heavy metals bioremediation potential of Klebsiella species isolated from diesel polluted soil. African Journal of Biotechnology. 16:1098–1105., Number 19: Academic Journals Abstract
n/a
Sartelli, M, Chichom-Mefire A, Labricciosa FM, Hardcastle T, Abu-Zidan FM, Adesunkanmi AK, Ansaloni L, Bala M, Balogh ZJ, Beltran MA, others.  2017.  The management of intra-abdominal infections from a global perspective: 2017 WSES guidelines for management of intra-abdominal infections. World Journal of Emergency Surgery. 12:1–34., Number 1: Springer Abstract
n/a
Adegbehingbe, OO, Adetiloye AJ, Adewole L, Ajodo DU, Bello N, Esan O, Hoover AC, Ior J, Lasebikan O, Ojo O, others.  2017.  Ponseti method treatment of neglected idiopathic clubfoot: Preliminary results of a multi-center study in Nigeria. World journal of orthopedics. 8:624., Number 8: Baishideng Publishing Group Inc Abstract
n/a
Ishola, A, Asaleye M, Ayoola O, Loto O, Idowu B.  2016.  Reference Ranges of Fetal Cerebral Lateral Ventricle Parameters by Ultrasonography, 2016/10/17. 38 Abstract

ObjectivesThis study was done to evaluate the normal fetal cerebral lateral ventricle dimensions with transabdominal ultrasonography. The atrial width (AW), ventricle-tochoroid measurement (V-C), ventricle-to-hemisphere ratio (VHR), and combined anterior horn measurement (CAHM) were taken.
Methods
This was a cross-sectional study involving 400 normal singleton pregnant subjects whose gestational ages were between 14 and 40 weeks. Transabdominal sonography was performed to obtain the values of the fetal cerebral lateral ventricle (FCLV) parameters. Data were reported as mean standard deviation (SD) for continuous variables. The degrees of correlation between FCLV parameters and the estimated gestational age (EGA) were obtained using Pearson's correlation. Regression equations were used to generate the reference limits for the FCLV measurements.
Results
The values of AW, V-C measurements and CAHM increased with advancing gestation. The mean values of the AW, V-C and CAHM from 14 to 40 weeks increased from 6.60 0.94 mm to 9.75 0.07 mm (R² = 0.114), 0.80 0.00 mm to 1.90 0.14 mm (R²= 0.266), and 6.95 0.06 mm to 23.07 4.02 mm (R²= 0.692) respectively, while the mean VHR decreased from 61.20 1.60% to 42.84 2.91% (R² = 0.706) over the same period.
Conclusion
The AW, V-C, and CAHM increase, while VHR decreases with advancing gestation.

Ishola, A, Asaleye M, Ayoola O, Loto O, Idowu B.  2016.  Reference Ranges of Fetal Cerebral Lateral Ventricle Parameters by Ultrasonography, 2016/10/17. 38 Abstract

ObjectivesThis study was done to evaluate the normal fetal cerebral lateral ventricle dimensions with transabdominal ultrasonography. The atrial width (AW), ventricle-tochoroid measurement (V-C), ventricle-to-hemisphere ratio (VHR), and combined anterior horn measurement (CAHM) were taken.
Methods
This was a cross-sectional study involving 400 normal singleton pregnant subjects whose gestational ages were between 14 and 40 weeks. Transabdominal sonography was performed to obtain the values of the fetal cerebral lateral ventricle (FCLV) parameters. Data were reported as mean standard deviation (SD) for continuous variables. The degrees of correlation between FCLV parameters and the estimated gestational age (EGA) were obtained using Pearson's correlation. Regression equations were used to generate the reference limits for the FCLV measurements.
Results
The values of AW, V-C measurements and CAHM increased with advancing gestation. The mean values of the AW, V-C and CAHM from 14 to 40 weeks increased from 6.60 0.94 mm to 9.75 0.07 mm (R² = 0.114), 0.80 0.00 mm to 1.90 0.14 mm (R²= 0.266), and 6.95 0.06 mm to 23.07 4.02 mm (R²= 0.692) respectively, while the mean VHR decreased from 61.20 1.60% to 42.84 2.91% (R² = 0.706) over the same period.
Conclusion
The AW, V-C, and CAHM increase, while VHR decreases with advancing gestation.

Yusuff, O, Owolabi F, Lawal-Bello A, Amjo O, Soyoye D, Kolawole B.  2016.  Type 2 DM risk evaluation in Nigerian undergraduates in Ile Ife: a comparison of the Finnish vs Indian risk scoring system, 2016/10/14. Abstract

Background & objectives: Type 2 diabetes is on the increase especially among young people around the world due to increase in obesity and sedentary life style. Many risks scoring system has been developed and validated worldwide. Most are simple and inexpensive.This research was to determine the applicability of these scoring systems in our environment and to compare the sensitivity of the Finnish versus the Indian scoring system in OAU undergraduates at Ile-Ife.
Methods: Hundred and eighty undergraduate students of OAU were recruited, the two questionnaires were administered which incorporated simple parameters such as age, abdominal obesity, BMI, physical activity, family history of DM, consumption of fruits and vegetable.
Results: 73.3% had low risk while 26.7% had moderate risk, 0% had high risk using the IDRS. While FINDRISC had 87.2% with low risk, 12.2% slightly elevated risk and 0.6%with moderate risk. The IDRS was more sensitive in detecting those at risk compared to the FINDRISC.
Conclusions: Most of the respondents had low risk of developing type 2 DM, It is important to educate them on prevention of type 2 DM. A Nigerian DM risk score should be developed.
Keywords: T2DM, India Diabetes Risk Score (IDRS), Finnish Diabetes risk score (FINDRISC), Prevention.

Ayoola, O, Bulus P, Loto O, Idowu B.  2016.  Normogram of umbilical artery Doppler indices in singleton pregnancies in south-western Nigerian women: Umbilical Doppler values in pregnancy, 2016/10/01. 42 Abstract

Aim:To determine the Doppler indices of the umbilical arteries in normal singleton pregnancy with a view to generating local reference ranges.
Methods:
In this prospective, cross-sectional study, 400 pregnant women at 15-39 weeks' gestational age, with estimated fetal weight within the 10th and 90th percentile, no fetal malformation(s), and without any history of maternal medical disease, were recruited. Umbilical arteries were assessed on ultrasound, with the subjects in the supine position. Resistivity index (RI), pulsatility index (PI) and systolic/diastolic (S/D) ratio were recorded and analyzed.
Results:
All the umbilical arteries were paired; no single umbilical artery was seen. Mean RI, PI, and S/D ratio declined with gestational age, and decreased from 1.265 to 0.829, from 0.760 to 0.585 and from 4.068 to 2.365, respectively, from 15 to 39 weeks of gestation. With regard to correlation between gestational age and Doppler indices, r = - 0.598 for PI (P < 0.05), - 0.437 for RI (P < 0.05), and - 0.538 for S/D ratio (P < 0.05). Decline in the Doppler indices was progressive with gestational age.
Conclusion:
A normogram of umbilical artery Doppler indices was constructed, which showed that the indices decreased with gestational age. These normative data could serve as reference ranges for evaluation of the umbilical artery circulation in this locality.