Showing posts with label Malaria Treatment Guidelines. Show all posts
Showing posts with label Malaria Treatment Guidelines. Show all posts

Saturday, 23 April 2011

MALARIA: Using Artesunate Instead Of Quinine

Geneva, April 19, 2011 – New MSF report calls on African governments, WHO and donors to urgently make the switch
Revolutionary Advance in Severe Malaria Treatment: Using Artesunate Instead Of Quinine Could Save 200,000 Lives Annually

After the revision of World Health Organization (WHO) guidelines yesterday, international medical humanitarian organization Médecins Sans Frontières/Doctors Without Borders (MSF) calls for a drug proven to reduce deaths in children suffering from severe malaria to be immediately rolled out in African countries. In its new report Making the Switch.MSF calls on African governments to follow new World Health Organization (WHO) guidelines, and switch from the far less effective quinine to artesunate treatment, which could avert nearly 200,000 deaths each year. MSF also calls on WHO and donors to support governments so this urgent treatment change can happen quickly.
“When children arrive at the clinic with severe malaria, they often are having convulsions, vomiting or at risk of going into shock, and you just want to be able to give them effective treatment quickly,” said Veronique De Clerck, Medical Coordinator for MSF in Uganda. “For decades, quinine has been used in severe malaria, but it can be both difficult to use and dangerous, so it’s time to bid it farewell. With artesunate, we now have a drug that saves more lives from severe malaria, and is safer, easier and more effective than quinine.”
Quinine has to be given three times a day in a slow intravenous drip that takes four hours, a treatment that is burdensome for both patients and health staff. Artesunate, in contrast, can be given in just four minutes, by giving a patient an intravenous or intramuscular injection.
A landmark clinical trial in late 2010 concluded that the use of artesunate to treat children with severe malaria reduces the risk of death by nearly a quarter. The study, carried out in nine African countries, found that for every 41 children given artesunate over quinine, one extra life was saved. Because of the complexities of administering quinine, children in the trial who were assigned to receive quinine were almost four times more likely to die before even receiving treatment.
MSF participated in the trial through its research affiliate Epicentre, with a research site in Uganda. MSF has since changed its own treatment protocols and now plans to work with national health authorities to roll out artesunate in its projects over the coming months.
The evidence is overwhelming, but MSF’s report stresses that change will not happen on its own. While WHO has now issued new guidelines recommending artesunate for treating severe malaria in children in Africa, it needs to also develop a plan to help countries make this switch. African governments must urgently change their treatment protocols and donors must send a clear signal to countries that they will support the additional cost where needed. Artesunate is three times more expensive, but the difference in cost of US$31 million each year for a global switch is very little for the nearly 200,000 lives that researchers say could be saved.
“We’ve been here before – when WHO changed its treatment recommendations for simple malaria in 2001 it took years for countries to actually make the switch, and shockingly, in some countries the far inferior drugs are still being used ten years on,” said Dr. Martin De Smet, who coordinates MSF’s malaria work. “With severe malaria, WHO needs to make sure that the change is much less sluggish, so lives can be saved immediately. There’s simply no excuse not to make the switch now.”
MSF provided malaria treatment to around one million people in 2010. Severe malaria kills over 600,000 African children under the age of five annually. Each year, around eight million simple malaria cases progress to severe malaria, where patients show clinical signs of organ damage, which may involve the brain, lungs, kidneys or blood vessels. ‘Making the Switch’, MSF’s new report calling for a change in protocol for the treatment of severe malaria in children can be downloaded from www.msfaccess.org

Monday, 8 November 2010

MALARIA: The effects of a pre-season treatment with effective antimalarials on subsequent malaria morbidity

The effects of a pre-season treatment with effective antimalarials on subsequent malaria morbidity in under five-year-old children living in high and seasonal malaria transmission area of Burkina Faso.
Ouédraogo A, Tiono AB, Diarra A, Nébié IO, Konaté AT, Sirima SB.
Abstract
OBJECTIVES: To evaluate the effects of pre-season treatment with single dose of sulfadoxine-pyrimethamine (SP) or artemether-lumefantrine (AL) on subsequent malaria morbidity in under-fives.
METHODS: A cohort of 156 children was enrolled for longitudinal follow-up. Children received curative therapy with SP or AL, and a third group received no treatment. Participants were home-visited twice a week with blood smears taken from children with fever (axillary T° ≥ 37.5 °C) or history of fever. To assess the time to re-infection, a blood film was also systematically obtained from pre-treated children every 2 weeks.
RESULTS: The mean time to the first malaria infection was 36 days in the SP arm and 26 days in the AL arm (P=0.006). The incidence density of malaria infection was similar in both groups (86.5%vs. 92.3%, P=0.52). The mean time to the first malaria episode was 47 days in the SP arm and 32 days in the AL arm (P<0.001). The incidence of malaria episodes was significantly higher in the group pre-treated with AL (45.7 per 1000 child days-at-risk CI 95% [35-56]) than in the control group (10.7 per 1000 child days-at-risk CI 95% [7-15]); P<0.001).
CONCLUSIONS: Our findings suggest that the radical clearance of parasitemia with AL may increase susceptibility to malaria infection and clinical malaria episodes.
Trop Med Int Health. 2010 Nov;15(11):1315-21. doi: 10.1111/j.1365-3156.2010.02618.x. Epub 2010 Sep 24.

http://www.ncbi.nlm.nih.gov/pubmed/20958888?dopt=Abstract
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-3156.2010.02618.x/abstract

Saturday, 10 July 2010

MALARIA: Africa's Children

Although several parasites can cause malaria it is the Plasmodium falciparum species that is responsible for the majority of the malaria deaths in Africa. In the countries at risk, artemisinin-combination therapy (ACT) has become the first-line treatment for the parasite.
However, there is concern that children suffering from a fever are mistakenly being given ACT when they do not actually have malaria.
This better-safe-than-sorry approach arose historically due to an absence of rapid diagnostics for the disease. While understandable, it leads to unnecessary waste of limited and valuable drug stocks, an increased risk of the parasite becoming resistant and the unfortunate consequence that children are being misdiagnosed and treated for the wrong condition.
Now that rapid diagnostic tests for malaria are available, there is a push to see them adopted and used widely. But there is a problem: while we know that ACT is being given to children without malaria, their proportion relative to malaria sufferers is not. This is because the data we have from clinics performing the treatments is either incomplete or unreliable, so it is difficult to accurately estimate how many non-sufferers are wrongly given ACT.
Fortunately, researchers from the
Malaria Atlas Project have succeeded in modelling this proportion. Combining their expertise in mapping the infection risk for P. falciparum, together with data on the prevalence of childhood fever, treatment-seeking behaviour and child populations, they estimate that, in 2007, the majority of fevers in African children attending public clinics were not caused by malaria.
Their study, published in
PLoS Medicine this week, also indicates that there are striking geographic differences. Children in some areas are much less likely to be suffering a fever due to malaria than in others. In Kenya, for example, approximately 15 per cent of fever sufferers seeking treatment are predicted to have malaria, whereas in Burkina Faso, it is nearer 60 per cent.
This model has implications for the healthcare agencies looking for the most rational and cost-effective way to use rapid diagnostic tests for malaria, and distribute drugs to the areas that need it the most. However, while the model is a step forward, the authors themselves sound a cautionary note:
What these models can never replace is high quality information from public sector services in the form of reliable and complete health information on drug use and patient burdens and whether these patients have peripheral infections.
Unfortunately, inadequacies in national health management information systems across Africa are in part a cause of the present imperfections in essential commodity demand and burden estimation.

http://wellcometrust.wordpress.com/2010/07/09/fever-and-malaria-in-african%c2%a0children/

Saturday, 1 May 2010

MALARIA: Historical aspects

Kicking off proceedings was LSHTM’s Professor Brian Greenwood, a legend in malaria research, who painted a picture of how malaria treatment used to be – and how much it has changed.
Forty years ago almost every African child had malaria, with an estimated prevalence of 95 per cent (though Greenwood reckoned it was nearer to 100 per cent in reality). Yet, at the time, confidence in malaria treatments was high. The front-line anti-malaria drugs such as chloroquine were effective and anti-malarials for prophylaxis were widely sold. “We didn’t have seminars about malaria,” said Greenwood, “People didn’t feel there needed to be [any]”.
But that was before the spectre of anti-malaria drug resistance emerged. Following the first report in 1968, resistance spread rapidly through the continent, rendering many of the front-line treatments ineffective and forcing a major rethink of treatment strategies.
A serious barrier was changing doctors’ behaviour. Despite the fact that resistance was widely acknowledged, chloroquine continued to be (mis-)used. Why?
“Everyone liked chloroquine,” said Greenwood, “Doctors had confidence in it from years of effective use, and doctors are very conservative by nature. Getting them to change their minds was a hard task.”
Moreover, chloroquine had benefits beyond malaria. It is an effective anti-inflammatory, one of the reasons the drug was always prescribed, even if the patient didn’t have malaria. Said Greenwood, “It was thought to be fine to do so as they were always likely to benefit”.
Furthermore, there was a widespread (erroneous) belief that having a few parasites circulating in the body ‘stimulated the immune system’. It was common practice in many places to give patients just one day of a three-day course of chloroquine.
We now know that many of these practices are detrimental to health and a boon to increasing the resistance of the parasite to the drug. The patient could develop anaemia or the parasite could recover and cause another bout of malaria.
By the 1990s the malaria community had learnt that treatment should eliminate all parasites. This was in no small part due to pioneering research by scientists such as
Professor Nick White from the Wellcome Trust’s Major Overseas Programme in Thailand (in South-east Asia the idea of leaving parasites around for immunity was never fully accepted). Also, from treating tuberculosis, researchers and healthcare workers soon realised that the use of mono-therapies – and overuse of them at that – was helping to increase drug resistance.
We now know the importance of diagnosing and only treating those who really have malaria, yet the relative slowness with which the community recognised these dangers was disastrous. Even today the idea of leaving a few parasites in the body has not completely been dispelled. As Greenwood said, it’s taken a long time to learn those messages and we are mostly there now, but the message must continue to be broadcast.

http://wellcometrust.wordpress.com/2010/04/26/counting-malaria-out-malaria-treatment-as-it-used-to-be/

Monday, 26 April 2010

Malaria: WHO Treatment Guidelines

April 25 is World Malaria Day, so this is a good opportunity to mention the new second edition of WHO's Guidelines for the treatment of malaria, second edition. Excerpt from WHO's website:
Half of the world's population is at risk of malaria, and an estimated 243 million cases led to an estimated 863 000 deaths in 2008.
Once a person develops malaria, the only means of reducing suffering and preventing death is by diagnosing and treating the disease. There are, today, tools with which a malaria diagnosis can be made even at the community level, and very effective medicines by way of artemisinin-based combination therapies for the treatment of uncomplicated malaria.
The World Health Organization Guidelines for the treatment of malaria provides evidence-based and up-to-date recommendations for countries on malaria diagnosis and treatment which help countries formulate their policies and strategies.

http://crofsblogs.typepad.com/h5n1/2010/04/world-malaria-day.html