SonoSite Ultrasound Investigating Schistosomiasis

February 16, 2018

Schistosomiasis, a disease that is common in sub-Saharan Africa, is particularly widespread in Madagascar. The Schistosoma mansoni parasite responsible for the disease is linked to fibrotic changes in the liver which can be detected using point-of-care ultrasound. Junior doctor Hannah Russell described how point-of-care ultrasound was put to the test in remote locations during an expedition to study the disease in Malagasy school children.

My interest in schistosomiasis – also known as bilharzia – and the Madagascar project began when I was a medical student, after meeting fellow student – now doctor – Stephen Spencer. He became interested in schistosomiasis during a placement in Egypt, and realised that there was little in the way of up-to-date research on the disease in parts of Madagascar. He asked myself and two other students to join him in a research study investigating schistosomiasis in school children living in remote rural areas of the country. Planning the expedition was hard work and took a long time, but we managed to secure funding from several different bodies to complement our own personal contributions, eventually setting off to Madagascar for the first phase of the study in 2015. Our aim was to measure the prevalence of schistosomiasis in school children aged between five and 14 years – a group that it was feasible to enlist in sufficient numbers – living in six villages located alongside the Nosivolo river in the Marolambo District, an area south of the capital, Antananarivo.

After landing in Antananarivo, we spent four days travelling overland to the capital of the district, the town of Marolambo, and then a further day to reach the first of the six villages. From there, we trekked along the Nosivolo River, stopping at each village to collect urine and stool samples, and examining them for the eggs of the parasite. We discovered that the area had an almost unheard of proportion of children – 97 per cent – infected with the parasites, and this led to a follow-up expedition to investigate the morbidity associated with the disease.

During my final year medical elective, I had become absolutely fascinated with point-of-care ultrasound and its potential applications. We had the idea of using it to look into the morbidity associated with schistosomiasis, complementing other information obtained through questionnaires about disease symptoms, cardiovascular fitness tests and a fingerprick test for anaemia. We based our research on the WHO recommendations for using ultrasound to investigate schistosomiasis, which included looking at the echogenicity of the liver, periportal fibrosis and the diameter of the portal vein. However, using large cart-based instruments in remote villages accessible only on foot is just not feasible; we needed a portable ultrasound system. We contacted FUJIFILM SonoSite, explaining what we were doing and why, and the company kindly lent us an iViz system for the project, which was ideal as its light weight and small size made it easy to carry around in a kit bag. The touchscreen interface is very logical and easy to use, and we were lucky enough to have the opportunity to practice our ultrasound skills in clinic under the guidance of a consultant radiologist – who was also very impressed by the system – before we left the UK.

Another consideration before we left for Madagascar was how to recharge the system’s batteries. We knew that we would not have access to power during the trip, and so we contacted a gentleman from Mobile Solar Chargers Ltd who had experience of using this technology in developing countries. He was very excited by what we were doing and kindly made some solar panels that could be used.  We took six batteries with us, which allowed us to work right through the day, and then we recharged them overnight from the power generated by the solar panels.

We performed all the ultrasound examinations in the school huts, and found the villagers to be unbelievably welcoming of our team, consisting of Stephen Spencer, James Penney, Cortland Linder and myself. Initially the children were very unsure what to make of it all, but once one child had put themselves forward and we had made it into a bit of a game with the jelly, saying “Oh, it's really cold”, they all had a bit of a giggle. After a few of them had been scanned, the rest jumped at the opportunity. With every person we scanned, we rotated the screen to show the image to the children, and their faces just lit up. They were really intrigued, climbing over each other to see the screen. Given the age group of the study cohort, we did not anticipate a huge incidence of fibrotic changes, but there were definitely a few children whose scans were not quite what you would expect in a healthy individual.

A really good thing about the iViz is its capability to record videos. This meant that we could not only take a snapshot, but also film for a few seconds. We came home with footage from about 300 children, which we are currently reviewing to determine any correlation between parameters such as height, weight and age, as well as doing statistical analysis of the results. Ultrasound was an excellent tool to have to hand, and we are extremely grateful to FUJIFILM SonoSite for lending the system to us. We look forward to completing the analysis of the data and publishing the results.

 

Acknowledgements

The author would like to acknowledge:

2015 team members – Stephen Spencer, James Penney, Anthony Howe, Andriamahitsisambatra Rakotomampianina, Anjara Nandimbiniaina, and Alain Rahetilahy.

2016 team members – Stephen Spencer, James Penny, Cortland Linder, Stephanie Jokhan, Andriamahitsisambatra Rakotomampianina, Anjara Nandimbiniaina, Alain Rahetilahy, Manu Andriamasy, and Lalarizo Rakoto Mahary.

Thanks in particular to the Royal Geographical Society (with the Institute of British Geographers), SES Rivers Foundation, Zochonis Enterprise Award, British Society of Immunology, University of Manchester Learning Enrichment Fund, MAF Madagascar, Mobile Solar Chargers Ltd, Craghoppers and FUJIFILM SonoSite. 

 

Collaboration

This project was initiated by, and is for, medical students, and could not have gone ahead without collaboration, advice, guidance and funding. Starting from scratch with very little knowledge of schistosomiasis, international work or Madagascar, an enormous amount of help was needed. The people and organisations who guided us through this process are: Professor Anthony Freemont and Manchester Medical School, Dr Ed Wilkins and the Infectious Diseases Unit at North Manchester General Hospital, Professor Andrew MacDonald, Dr Sheena Cruikshank and the Immunology Department at the University of Manchester, Dr Jane Wilson-Howarth, Anglo-Malagasy Society, Jayne Jones and the Liverpool School of Tropical Medicine, Herizo Andrianandrasana and the Durrell Wildlife Conservation Trust, Dr Peter Long (University of Oxford), Dr Shona Wilson (University of Cambridge), Schistosomiasis Control Initiative, Natural History Museum London, World Health Organization, Royal Geographical Society, East Lancashire Hospitals NHS Trust, Mission Aviation Fellowship, Dr Alain Rahetilahy and the Madagascar Ministry of Health, Professor Luc Samison and the University of Antananarivo, Dr Clara Fabienne and the Institut Pasteur (Madagascar), Zochonis Enterprise Award, British Medical and Dental Schools’ Trust, Dr Richard Sawyer and the Radiology Department at University Hospital South Manchester, Dr Elizabeth Joekes (Liverpool School of Tropical Medicine), Professor Bertie Squire (Liverpool School of Tropical Medicine), and Professor Russ Stothard (Liverpool School of Tropical Medicine).

 

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