Achieving universal access to obstetric ultrasound in resource constrained settings: A narrative review

The training of midwives to perform obstetric ultrasound scan in Africa for task shifting and extension of scope of practice: a scoping review

INTRODUCTION

Ultrasound scan is one of the essential assessments that is crucial in the early identification of health risks during antenatal care. Its accessibility to women in low-and middle-income countries remains a serious challenge because ultrasound scans are not within the scope of practice for midwives. However, task shifting and extension of scope of practice aim to train midwives to assess pregnant women through an ultrasound scan. This paper aims to report the findings of a scoping review on the training of midwives to perform obstetric ultrasound scans in Africa.

METHODS

The 6-step iterative framework for scoping reviews by Arksey and O'Malley was used to determine the extent of qualitative and quantitative evidence available on the training of midwives on obstetric ultrasound scans, which includes specifying the research question, identifying relevant studies, selecting studies, extracting and charting data, collating, summarising, and synthesising and reporting findings.

RESULTS

A total of 12 articles from eight African countries were included in this scoping review. Three main themes and 13 sub-themes emerged and they are: obstetric ultrasound scan training, challenges experienced by midwives from task shifting and extension of scope of practice regarding obstetric ultrasound scan, and the value of task shifting and extension of scope of practice regarding obstetric ultrasound scan to midwives.

DISCUSSION

Despite the available evidence that the training of midwives on obstetric ultrasound scans is essential to ensure the accessibility of quality antenatal health services, the training of midwives on obstetric ultrasound scans in some African countries remains a serious challenge. It is evident from this scoping review results that there is a need for African countries to incorporate obstetric ultrasound scans as part of the scope of practice of midwives. Task shifting necessitates prioritising the training of midwives on the use of obstetric ultrasound scans as one of the steps towards the achievement of the United Nations Sustainable Development Goal number 3 targets by 2030.

Imperatives of Mathematical Model of Arterial Blood Dynamics for Interpretation of Doppler Velocimetry: A Narrative Review

Clinicians frequently study arterial Doppler velocimetric waveforms depicted by Doppler sonography of the kidneys, the heart, the brain, and the feto-maternal circulation to assess the well-being of the aforementioned vital organs. The waveform interpretation of the Doppler indices can be studied using a mathematical model. The developed models serve as teaching tools and for easy comprehension of the regulatory mechanism of the organs. It will also obtain accurate wall shear stress (WSS) and likely atherosclerotic sites can be predicted early. The aim of this review is to reveal the imperatives of mathematical models in the study of the physical interpretation of Doppler velocimetry. The models will explore sonographic Doppler velocimetry and computational fluid dynamics (CFD) in determining the segments of the arteries that are prone to the development of atheromatous plaque. It will be achieved by comparing and computing the measurement differences of the WSS. A thorough literature review was carried out between 1971 and 2021 on the mathematical modeling of blood dynamics and Doppler velocimetry of different blood vessels, across various electronic databases including NC AHEC Digital Library, PUBMED, ERIC, MEDLINE, Free Medical Journals, and EMBASE. The results of the literature search were presented using the PRISMA flow chat. The narrative review of the mathematical models of arterial blood dynamics is based on incompressible Navier-Stokes equations, the Windkessel model, and CFD. It was deduced that the blood flow velocity decreased with time across the varying frequency from 0.2Hz to 0.50Hz in the interlobar arterial channels. The review also revealed that adult humans' Doppler indices of the renal-interlobar artery agree with developed models of renal interlobar arterial blood dynamics. The mathematical model measurements of the great vessels matched the sonographic Doppler velocimetry with <15% variation. In our fast-paced world of epidemiological transition, the imperatives of mathematical modeling of arterial flow dynamics based on the Navier-Stokes equations to represent various physiologic and pathologic situations cannot be overstated. The practical consequences include the possibility of mathematical models to acquire precise WSS distribution and early detection of potential atherosclerotic sites during cardiovascular Doppler sonography.

Appraisal of trimester-specific fetal heart rate and its role in gestational age prediction

INTRODUCTION

The aim of this study was to evaluate and report normal sonographic FHR values among low-risk singleton women across the three trimesters of pregnancy and determine FHR role in gestational age prediction.

METHOD

A prospective cross-sectional study of 2727 low-risk singleton pregnant women was undertaken. FHR measurements were obtained by a consultant radiologist and three experienced sonographers using transabdominal approach from January 2019 to December 2020. Two FHR measurements were taken for each participant. The fetal lie and presentation were also documented in the first trimester. Data were analysed using SPSS version 24 (IBM, Armonk, NY, USA).

RESULT

The maternal mean ± SD age was 25.8 ± 6.5 years and mean FHR for first, second and third trimesters were 151 ± 16, 145 ± 6 and 125±6 bpm respectively. The mean ± SD gestational age were 10 ± 2, 19 ± 3 and 34 ± 2 weeks for the first, second and third trimester respectively. Using ANOVA, there were statistically significant differences in FHR across the three trimesters (p ≤ 0.05). A positive correlation existed between maternal age and FHR (r = 0.57, p ≤ 0.05).

CONCLUSION

This study has established normal values for FHR in first, second and third trimester respectively. Referring physicians, radiologists, sonographers, obstetricians and gynaecologists may consider FHR of (135-167) bpm (139-151) bpm and (119-131) bpm as normal FHR ranges for the first, second and third trimester respectively. This study has also revealed the possibility of gestational age prediction using FHR with the equation [Gestational Age = 87.8 - (0.47) FHR].

IMPLICATIONS FOR PRACTICE

This paper provides the most up-to-date sonographic FHR recommendations for fetal management. More importantly, findings from this study also suggests that ultrasound practitioners can use FHR measurements as a reliable alternative for fetal dating.

Potential for Use of Portable Ultrasound Devices in Rural and Remote Settings in Australia and Other Developed Countries: A Systematic Review

Introduction

Objective

Methods

Results

Conclusion

Impact of ultrasound scanning on pregnant Women's compliance with attendance at antenatal care visits and supervised delivery at primary healthcare centres in northern Nigeria: Initial experiences

INTRODUCTION

The world health organisation (WHO) recommends at least one ultrasound scan amidst eight antenatal care visits, however, most pregnant women in low and middle-income countries do not achieve this. This study aims to assess the impact of limited obstetrics ultrasound (LOUS) within primary healthcare centres in northern Nigeria.

METHODS

A cross sectional study was conducted across selected primary healthcare centres in Bauchi and Kano States (northern Nigeria). The study protocol was approved by the Ministry of Health in each State. Within each State a total of nine primary healthcare centres were randomly selected. Information on all complete antenatal care (ANC) records of women who used the primary healthcare facility for 12 months prior to introduction of ultrasound (January 2016 to December 2016) and 12 months after (January 2018 to December 2018) were collected. Study data were analysed using descriptive (mean, standard deviations) and inferential statistics. Independent sample t-test were used to find out if there was a statistical difference between the pre and post-intervention data on women compliance to ANC visits, facility based delivery, maternal and child mortality. Data were analysed using the Statistical Package for Social Sciences and significance was set at p ≤ 0.05.

RESULTS

There was a significant increase in the number of ANC visits and supervised facility delivery after introduction of ultrasound services (LOUS) in the primary healthcare centres. The number of ANC visits in Kano State was 2637.6 ± 972.0 before and 3793.0 ± 517.5 after the introduction of ultrasound services. The number of ANC visits in Bauchi State was 1866.6 ± 488.3 before and 2854.0 ± 631.3 after the introduction of ultrasound services. The number of supervised facility deliveries in Kano state was 520.1 ± 128.7 before and 1021.1 ± 217.0 after the introduction of LOUS. The number of supervised facility deliveries for Bauchi state was 553.1 ± 309.9 before and 1056.3 ± 295.4 after introduction of LOUS. A total of 2486 (11.0%) women were referred for further imaging due to equivocal ultrasound findings. A total of 2185 (9.7%) pregnant women were referred for appropriate care due to multiple gestations.

CONCLUSION

This study found that LOUS, in resource scarce settings, has the potential of improving ANC visits, facility delivery rates and reduce maternal and child mortality. It also leads to change in patient management plans resulting in referrals for appropriate care.

IMPLICATION FOR PRACTICE

Technological interventions using ultrasound have the potential to motivate pregnant women to attend ANC, give birth in a healthcare facility and thus reduce maternal and child morbidity and mortality. This is in line with the global drive to reduce maternal and child death by 2030 to less than 70 maternal deaths in 100,000 live births and neonatal mortality reduction to 12 in 1000 live births and under 5 mortality reduction to 25 in 1000 live births.