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Ayoola, OO, Bolarinwa RA, Aderibigbe AS, Onigbinde SO, Oguntade BO.  2020.  Portal hypertension evolving from sickled hepatopathy: Could hepatic venous Doppler ultrasound be beneficial in its evaluation? Medical hypotheses. 135:109450.: Elsevier Abstract
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Ayoola, TJ, Obokoh LO.  2018.  Corporate Governance and Financial Distress in the Banking Industry: Nigerian Experience. Journal of Economics and Behavioural Studies. 10(1):182-193.2101-13-3095-1-10-20180315.pdf
Ayoola, OO, Bolarinwa RA, Onwuka CC, Idowu BM, Aderibigbe AS.  2020.  Association Between Endothelial Dysfunction, Biomarkers of Renal Function and Disease Severity in Sickle Cell Disease. Kidney360. :10–34067.: Am Soc Nephrol Abstract
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Ayoola, MD, Adebajo AC, Zotor FB, Pinkoane MG.  2019.  Justifying Antidiabetic Ethnomedicinal Claim of Senecio biafrae through Its Antihyperglycemic and Anti-Oxidant Activities. Ann Complement Altern Med. 2019; 1 (2). 1006 Abstract
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Ayoola, TJ.  2014.  Computer-Assisted-Audit Tools and Techniques and Financial Statement Fraud: Lessons from the Nigerian Banking Crises. International Conference on Accounting, Finance and Management on Accountability and Sustainable Business Development in Emerging Economies. :61-79., Conference Centre and Guest Houses: Department of Management and Accounting, Faculty of Administration, Obafemi Awolowo University, Ile Ife
Ayoola, O, Bolarinwa R, Onakpoya U, Onwuka C, Adedeji T, Afolabi B, Onigbinde S, Arogundade F.  2019.  Doppler ultrasonographic evaluation of celiac and mesenteric arteries in subjects with sickle cell disease, 2019/05/07. 47 Abstract

Vasculopathy, as occurring in sickle cell disease (SCD), can affect celiac and mesenteric arteries and result in stenosis, with elevated peak systolic velocity (PSV) on Doppler ultrasonography. In six subjects with confirmed SCD in steady state, routine Doppler ultrasonographic examination discovered features of celiac artery (CA) or superior mesenteric artery (SMA) stenosis with CA PSV >200 cm/s (median = 222.8 cm/s; range = 201.5‐427.1 cm/s) and/or SMA PSV >275 cm/s (median 183.2 cm/s; range = 87.8‐289.3 cm/s). Among the six subjects, five had elevated soluble P‐selectin values (median 72.55 ng/mL), while all six (100%) had elevated cystatin C levels (median 4.15 mg/L). Peripheral oxygen saturation was suboptimal in five subjects. All subjects had low hemoglobin concentration levels (median 8.5 g/dL) while four had elevated white blood cell count. Although vaso‐occlusive crises result from microvessel occlusion, these findings at the macrovascular level suggest that SCD patients may also be vulnerable to mesenteric ischemic injury, especially in the setting of anemic heart failure from hemolysis.

Ayoola, TJ, Oyerinde AA, Inneh GE.  2019.  Audit Market Concentration and Audit Fees: Empirical Evidence from Nigerian Deposit Money Banks. International Journal of Accounting and Management. 3(2):91-106.audit_market_concentration_and_audit_fees.pdf
Ayoola, TJ.  2013.  Nigeria-China Trade Relations: Implication on the Nigerian Domestic Economy. Research Journal of Finance and Accounting. 4(17):91-97.
Ayoola, TJ.  2013.  The Effect of Cashless Policy of Government on Corruption in Nigeria. International Review of Management and Business Research. 2(3):682-690.
Ayoola, O, Bolarinwa R, Onigbinde S, Onakpoya O, Asaleye M, Odedeyi A.  2019.  Intima-media thickness of the common carotid arteries as a marker of retinopathy in sickle cell disease, 2019/07/05. 39 Abstract

Purpose:This study was conducted to test the hypothesis that the carotid intima-media thickness (CIMT) is higher in patients with sickle cell disease (SCD) than in the normal population, and to determine the relationships of the CIMT with central retinal artery (CRA) and renal artery Doppler indices.
Methods:
Forty-four confirmed steady-state SCD patients aged 16 years and above were recruited consecutively. The Doppler velocimetric indices of their right renal artery and both CRAs were obtained. The CIMT was also measured on each side via B-mode ultrasonography. The subjects were categorized by age and sex. Mean and median values for each group were determined. The Spearman correlation test was used to quantify the relationships between CIMT and the Doppler parameters.
Results:
The participants had a median age of 24.50 years (interquartile range, 12.50 to 36.50 years). Twenty-three were men (52.3%) and 21 were women (47.7%). The median CIMT was 0.70 mm (IQR, 0.50 to 0.90 mm). Significant correlations with the CIMT were found for the CRA peak systolic velocity (r=0.312, P=0.003), the renal artery resistivity index (RI) (r=0.284, P=0.007), and the renal artery pulsatility index (PI) (r=0.273, P=0.010). There was no significant relationship between the CIMT and the CRA end-diastolic velocity, CRA RI, or CRA PI.
Conclusion:
The CIMT was higher in SCD patients than in the normal population. In addition, the CIMT was significantly correlated with the CRA peak systolic velocity, the renal artery RI, and the renal artery PI.

Ayoola, O.  2020.  Sickle cell disease: Studying arteries with Doppler ultrasound, 2020/08/19. Abstract

Sickle cell disease is one of the most common genetic diseases worldwide. Occlusion of blood vessels triggers painful crises and leads to various clinical manifestations such as kidney failure, leg ulcers, bowel ischemia, portal hypertension and retinopathy. Many imaging methods allow to observe vaso-occlusion but are limitedby cost and availability issues. In this write-up, the value of Doppler
ultrasonography, a cheap, readily accessible, and noninvasive technique, is illustrated in the evaluation of different vessels in sickle cell disease patients.

Ayoola, O, Soyoye D, Dawha S, Ikem R, Onakpoya O, Adedeji T, Arogundade F.  2016.  The Relationship between Central Retinal Artery Resistive Index and Measures of Renal Function in Type 2 Diabetes, 2016/01/01. 06:146-151. Abstract
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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.

Ayoola, OO, Bolarinwa RA, Onakpoya UU, Adedeji TA, Onwuka CC, Idowu BM.  2018.  Intima-media thickness of the common femoral artery as a marker of leg ulceration in sickle cell disease patients. Blood advances. 2:3112–3117., Number 22: American Society of Hematology Washington, DC Abstract
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Ayoola, TJ.  2011.  Gas Flaring and its Implication for Environmental Accounting in Nigeria. Journal of Sustainable Development. 4(5):244-250.11356-37509-1-pb.pdf
Ayoola, O, Soyoye D, Dawha S, Ikem R, Onakpoya O, Adedeji T, Arogundade F.  2016.  The Relationship between Central Retinal Artery Resistive Index and Measures of Renal Function in Type 2 Diabetes, 2016/01/01. 06:146-151. Abstract
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Ayoola, O, Bolarinwa R, Onigbinde S, Onakpoya O, Asaleye M, Odedeyi A.  2019.  Intima-media thickness of the common carotid arteries as a marker of retinopathy in sickle cell disease, 2019/07/05. 39 Abstract

Purpose:This study was conducted to test the hypothesis that the carotid intima-media thickness (CIMT) is higher in patients with sickle cell disease (SCD) than in the normal population, and to determine the relationships of the CIMT with central retinal artery (CRA) and renal artery Doppler indices.
Methods:
Forty-four confirmed steady-state SCD patients aged 16 years and above were recruited consecutively. The Doppler velocimetric indices of their right renal artery and both CRAs were obtained. The CIMT was also measured on each side via B-mode ultrasonography. The subjects were categorized by age and sex. Mean and median values for each group were determined. The Spearman correlation test was used to quantify the relationships between CIMT and the Doppler parameters.
Results:
The participants had a median age of 24.50 years (interquartile range, 12.50 to 36.50 years). Twenty-three were men (52.3%) and 21 were women (47.7%). The median CIMT was 0.70 mm (IQR, 0.50 to 0.90 mm). Significant correlations with the CIMT were found for the CRA peak systolic velocity (r=0.312, P=0.003), the renal artery resistivity index (RI) (r=0.284, P=0.007), and the renal artery pulsatility index (PI) (r=0.273, P=0.010). There was no significant relationship between the CIMT and the CRA end-diastolic velocity, CRA RI, or CRA PI.
Conclusion:
The CIMT was higher in SCD patients than in the normal population. In addition, the CIMT was significantly correlated with the CRA peak systolic velocity, the renal artery RI, and the renal artery PI.

Ayoola, O, Bolarinwa R, Onigbinde S, Onakpoya O, Asaleye M, Odedeyi A.  2019.  Intima-media thickness of the common carotid arteries as a marker of retinopathy in sickle cell disease, 2019/07/05. 39 Abstract

Purpose:This study was conducted to test the hypothesis that the carotid intima-media thickness (CIMT) is higher in patients with sickle cell disease (SCD) than in the normal population, and to determine the relationships of the CIMT with central retinal artery (CRA) and renal artery Doppler indices.
Methods:
Forty-four confirmed steady-state SCD patients aged 16 years and above were recruited consecutively. The Doppler velocimetric indices of their right renal artery and both CRAs were obtained. The CIMT was also measured on each side via B-mode ultrasonography. The subjects were categorized by age and sex. Mean and median values for each group were determined. The Spearman correlation test was used to quantify the relationships between CIMT and the Doppler parameters.
Results:
The participants had a median age of 24.50 years (interquartile range, 12.50 to 36.50 years). Twenty-three were men (52.3%) and 21 were women (47.7%). The median CIMT was 0.70 mm (IQR, 0.50 to 0.90 mm). Significant correlations with the CIMT were found for the CRA peak systolic velocity (r=0.312, P=0.003), the renal artery resistivity index (RI) (r=0.284, P=0.007), and the renal artery pulsatility index (PI) (r=0.273, P=0.010). There was no significant relationship between the CIMT and the CRA end-diastolic velocity, CRA RI, or CRA PI.
Conclusion:
The CIMT was higher in SCD patients than in the normal population. In addition, the CIMT was significantly correlated with the CRA peak systolic velocity, the renal artery RI, and the renal artery PI.

Ayoola, TJ.  2022.  Audit fees, audit seasonality and audit quality in Nigeria: a mediation analysis. Journal of Financial Reporting and Accounting.
Ayoola, TJ, Inneh EG, Obokoh LO, Kolawole PE, Adeoye ET.  2022.  Competition and efficiency in an oligopolistic audit market: Evidence from the Nigerian banking industry. Banks and Bank Systems. 17(4):129-139.bbs_2022_04_ayoola.pdf
Ayorinde, AT, Makanjuola GA, Aluko OB, Owolarafe OK, Sanni LA.  2019.  Performance evaluation of a kenaf decorticator. Agricultural Engineering International: CIGR Journal. 21:192–202., Number 1 Abstract
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