Efficacy and Safety of Artesunate + Amodiaquine With SLD of Primaquine for Treatment of Falciparum Malaria in Zanzibar

NCT ID: NCT03773536

Last Updated: 2018-12-12

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE4
• Total Enrollment: 146 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2017-05-09
• Study Completion Date: 2017-09-25

Brief Summary

The general objective of this study is to assess the therapeutic efficacy and safety of artesunate + amodiaquine combined with a single low dose of primaquine (0.25 mg/kg) for the treatment of uncomplicated P. falciparum malaria patients in Zanzibar.

The specific objectives are:

• To determine the clinical and parasitological efficacy of artesunate + amodiaquine and primaquine in the treatment of uncomplicated Plasmodium falciparum infection.
• To differentiate recurrent infections during follow-up, i.e. recrudescence from new infections, by polymerase chain reaction (PCR).
• To evaluate the incidence of adverse events, particularly with regards to potential hematological adverse events of primaquine.
• To determine the polymorphism of molecular markers associated with artesunate + amodiaquine tolerance/resistance.
• To formulate recommendations, which will enable the Zanzibar Ministry of Health to make informed decisions about whether the current national antimalarial treatment guidelines should be updated or not.
• To determine efficacy rate of the first line treatment compared to the first efficacy trial thirteen years ago.

Detailed Description

The aim of this study is to provide policymakers with updated efficacy and safety data of artesunate + amodiaquine in combination with a single low dose of primaquine (0.25 mg/kg) and data on genetic markers of tolerance/resistance to artemisinin based combination therapies (ACTs), proposed as an early warning system for development and spread of antimalarial drug resistance, in Zanzibar. The study protocol is based on the new WHO guidelines for surveillance of antimalarial drug efficacy (WHO 2014).

This surveillance study was designed as a one-arm prospective evaluation of the clinical and parasitological responses to directly observed treatment for uncomplicated malaria. Participants were recruited from febrile patients, i.e. documented axillary temperature ≥37.5 °C or history of fever during the past 48 hours, of 3 months and older, presenting at primary health care facilities in Zanzibar, with microscopy confirmed uncomplicated P. falciparum infection. Enrolled patients received directly observed treatment with artesunate + amodiaquine once daily for 3 consecutive days according to the national malaria treatment guidelines. A single low dose of primaquine (0.25 mg/kg) was administered together with the first artesunate + amodiaquine dose. Clinical and parasitological as well as safety parameters were monitored over a 28-day follow-up period. The follow-up consisted of a fixed schedule of check-up visits and corresponding clinical and laboratory examinations. On the basis of the results of these assessments, the patients were classified as having therapeutic failure (early or late) or an adequate response. Blood samples from patients experiencing therapeutic failure during the follow-up period were used to estimate the efficacy of the study drugs based on PCR analysis to distinguish between recrudescence (treatment failures) and reinfection (new infections).

A standard physical examination was performed at baseline (day 0 before drug administration) and on days 1, 2, 3, 7, 14, 21, and 28 ,or any other day if the patient returned spontaneously and parasitological reassessment was required. This examination included measuring axillary temperature, with a thermometer that has a precision of 0.1 °C, as well as conducting a thick film for asexual and gametocyte counts and species identification. Haemoglobin was assessed systematically on all participants on days 0, 3, 7, 14 and 28 using Hemocue, and at any time in case of clinical suspicion of anaemia, i.e. pallor, according to standard case management of malaria in Zanzibar.

In order to differentiate a recrudescence (treatment failure/same parasite strain) from a newly acquired infection (reinfection/different parasite strain) among recurrent parasitemias found during follow-up, a genotype analysis was to be conducted. This analysis was based on the extensive diversity in the following P. falciparum genes: the merozoite surface protein 1 (msp1) and 2 (msp2), and the glutamine-rich protein (glurp) (WHO 2008). The genotypic profiles of pre- and post-parasite strains were to be compared in a stepwise manner to distinguish recrudescence from reinfection. In order to minimize discomfort to the patient due to repeated finger pricks, two to three drops of blood will be collected on a 3MM (Whatman) filter paper during screening or enrollment and each time blood smears are required according to the protocol from day 7.

The results of this study will be used to assist the Zanzibar Ministry of Health in assessing the current national treatment guidelines for uncomplicated P. falciparum malaria.

Conditions

Plasmodium Falciparum Malaria

Keywords

Artesunate-amodiaquine; Single Low Dose Primaquine; Zanzibar

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

ASAQ + SLD Primaquine

Artesunate + amodiaquine (WHO prequalified Artesunate/Amodiaquine Winthrop®) was administered orally as a fixed dose combination, at a dose of approximately artesunate 4 mg/kg + amodiaquine 10mg/kg once daily for 3 consecutive days. Primaquine was administered orally, as a single dose (0.25 mg/kg) together with the first artesunate + amodiaquine dose. All doses of medicine were administered under direct supervision. Any patient who vomited within a 30 minute observation period was re-treated with the same dose of medicine and observed for an additional 30 minutes. If the patient vomited again after the second study drug administration, he/she was withdrawn and offered rescue therapy (Artesunate IV).

Group Type: EXPERIMENTAL

Artesunate-amodiaquine given with single low dose primaquine

Intervention Type: DRUG

Three day treatment with ASAQ with SLD primaquine given with the first dose of ASAQ.

Interventions

Artesunate-amodiaquine given with single low dose primaquine

Three day treatment with ASAQ with SLD primaquine given with the first dose of ASAQ.

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

• Age 3 months and above;
• P. falciparum infection detected by malaria rapid diagnostic test (mRDT) and confirmed by microscopy;
• Presence of P. falciparum malaria asexual parasitaemia (any level);
• Presence of axillary ≥37.5 °C or history of fever during the past 48 hours
• Ability to swallow oral medication;
• Ability and willingness to comply with the study protocol for the duration of the study and to comply with the study visit schedule; and
• Informed consent from the patient or from a parent or guardian in the case of children.

Exclusion Criteria

• Presence of general danger signs in children aged under 5 years or signs of severe falciparum malaria according to the definitions of WHO (Appendix 1);
• Mono-infection with a Plasmodium species other than P. falciparum detected by microscopy;
• Presence of febrile conditions other than malaria (e.g. measles, acute lower respiratory tract infection, severe diarrhoea with dehydration) or other known underlying chronic or severe diseases (e.g. severe malnutrition, cardiac, renal and hepatic diseases, HIV/AIDS);
• Regular medication, which may interfere with the study drugs;
• History of hypersensitivity reactions or contraindications to any of the study medicines; and
• Pregnancy

• Minimum Eligible Age: 3 Months
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Ministry of Health and Social Welfare, Zanzibar

OTHER_GOV

Sponsor Role: collaborator

Zanzibar Malaria Elimination Programme

OTHER_GOV

Sponsor Role: collaborator

Uppsala University

OTHER

Sponsor Role: collaborator

Professor Anders Björkman

OTHER

Sponsor Role: lead

Responsible Party

Professor Anders Björkman

Professor

Responsibility Role: SPONSOR_INVESTIGATOR

Principal Investigators

Mwinyi I Msellem

Role: PRINCIPAL_INVESTIGATOR

Mnazi mmoja hospital, Zanzibar Ministry of Health

Abduallah S Ali

Role: STUDY_DIRECTOR

Zanzibar Malaria Elimination Programme

Andreas Martensson

Role: STUDY_CHAIR

Uppsala University

Locations

Micheweni, Bububu Jesheni, and Uzini

Zanzibar, , Tanzania

Countries

Tanzania

Provided Documents

Document Type: Study Protocol, Statistical Analysis Plan, and Informed Consent Form

View Document

Other Identifiers

Aco V

Identifier Type: -

Identifier Source: org_study_id