Sommay Keomany

Publications (6)15.37 Total impact

• Source

  Available from: PubMed Central

  Article: A phase III, randomized, non-inferiority trial to assess the efficacy and safety of dihydroartemisinin-piperaquine in comparison with artesunate-mefloquine in patients with uncomplicated Plasmodium falciparum malaria in southern Laos.

  Mayfong Mayxay, Sommay Keomany, Maniphone Khanthavong, Phoutthalavanh Souvannasing, Kasia Stepniewska, Tiengthong Khomthilath, Siamphay Keola, Tiengkham Pongvongsa, Samlane Phompida, David Ubben, Neena Valecha, Nicholas J White, Paul N Newton
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  ABSTRACT: We conducted an open, randomized clinical trial of oral dihydroartemisinin-piperaquine (DP) versus artesunate-mefloquine (AM) in 300 patients in Laos with uncomplicated Plasmodium falciparum malaria as part of a multicentre study in Asia. Survival analysis and adjustment for re-infection showed that the 63-day cure rates (95% confidence interval [CI]) were 100% for AM and 99.5% (96.4-99.8%) for DP. The 63-day cure rates per protocol were 99% (97 of 98) for AM and 99.5% (196 of 197) for DP (P = 0.55). The difference (AM minus DP) in cure rates (95% CI) was -0.5% (-5.1 to 2.0%), which is within the 5% non-inferiority margin. The median fever and parasite clearance times were also similar for AM and DP. The proportion of patients with at least one recorded potential adverse event was significantly higher in the AM group (38 of 87, 44%) than in the DP group (57 of 182, 31%) (relative risk = 0.6, 95% CI = 0.4-0.9; P = 0.04). Dihydroartemisinin-piperaquine is not inferior to AM in the treatment of uncomplicated P. falciparum malaria in Laos and is associated with fewer adverse effects. The results of this study were similar to those of the larger multicentre study.
  The American journal of tropical medicine and hygiene 12/2010; 83(6):1221-9. · 2.59 Impact Factor
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  Available from: Aung Phyo

  Article: An open-label, randomised study of dihydroartemisinin-piperaquine versus artesunate-mefloquine for falciparum malaria in Asia.

  Neena Valecha, Aung Pyae Phyo, Mayfong Mayxay, Paul N Newton, Srivicha Krudsood, Sommay Keomany, Maniphone Khanthavong, Tiengkham Pongvongsa, Ronnatrai Ruangveerayuth, Chirapong Uthaisil, [......], Antonella Bacchieri, Marco Corsi, Bappanad H K Rao, Prabash C Bhattacharya, Nagesh Dubhashi, Susanta K Ghosh, Vas Dev, Ashwani Kumar, Sasithon Pukrittayakamee, Sasithon Pukittayakamee
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  ABSTRACT: The artemisinin-based combination treatment (ACT) of dihydroartemisinin (DHA) and piperaquine (PQP) is a promising novel anti-malarial drug effective against multi-drug resistant falciparum malaria. The aim of this study was to show non-inferiority of DHA/PQP vs. artesunate-mefloquine (AS+MQ) in Asia. This was an open-label, randomised, non-inferiority, 63-day follow-up study conducted in Thailand, Laos and India. Patients aged 3 months to 65 years with Plasmodium falciparum mono-infection or mixed infection were randomised with an allocation ratio of 2:1 to a fixed-dose DHA/PQP combination tablet (adults: 40 mg/320 mg; children: 20 mg/160 [DOSAGE ERROR CORRECTED] mg; n = 769) or loose combination of AS+MQ (AS: 50 mg, MQ: 250 mg; n = 381). The cumulative doses of study treatment over the 3 days were of about 6.75 mg/kg of DHA and 54 mg/kg of PQP and about 12 mg/kg of AS and 25 mg/kg of MQ. Doses were rounded up to the nearest half tablet. The primary endpoint was day-63 polymerase chain reaction (PCR) genotype-corrected cure rate. Results were 87.9% for DHA/PQP and 86.6% for AS+MQ in the intention-to-treat (ITT; 97.5% one-sided confidence interval, CI: >-2.87%), and 98.7% and 97.0%, respectively, in the per protocol population (97.5% CI: >-0.39%). No country effect was observed. Kaplan-Meier estimates of proportions of patients with new infections on day 63 (secondary endpoint) were significantly lower for DHA/PQP than AS+MQ: 22.7% versus 30.3% (p = 0.0042; ITT). Overall gametocyte prevalence (days 7 to 63; secondary endpoint), measured as person-gametocyte-weeks, was significantly higher for DHA/PQP than AS+MQ (10.15% versus 4.88%; p = 0.003; ITT). Fifteen serious adverse events were reported, 12 (1.6%) in DHA/PQP and three (0.8%) in AS+MQ, among which six (0.8%) were considered related to DHA/PQP and three (0.8%) to AS+MQ. DHA/PQP was a highly efficacious drug for P. falciparum malaria in areas where multidrug parasites are prevalent. The DHA/PQP combination can play an important role in the first-line treatment of uncomplicated falciparum malaria. Controlled-Trials.com ISRCTN81306618.
  PLoS ONE 01/2010; 5(7):e11880. · 4.09 Impact Factor
• Article: Correction: An Open-Label, Randomised Study of Dihydroartemisinin-Piperaquine Versus Artesunate-Mefloquine for Falciparum Malaria in Asia.

  Neena Valecha, Aung Pyae Phyo, Mayfong Mayxay, Paul N Newton, Srivicha Krudsood, Sommay Keomany, Maniphone Khanthavong, Tiengkham Pongvongsa, Ronnatrai Ruangveerayuth, Chirapong Uthaisil, [......], Stephan Duparc, Antonella Bacchieri, Marco Corsi, Bappanad H K Rao, Prabash C Bhattacharya, Nagesh Dubhashi, Susanta K Ghosh, Vas Dev, Ashwani Kumar, Sasithon Pukrittayakamee
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  ABSTRACT: [This corrects the article on p. e11880 in vol. 5.].
  PLoS ONE 01/2010; 5(9). · 4.09 Impact Factor
• Article: Toad poisoning in Laos.

  Sommay Keomany, Mayfong Mayxay, Phouthalavanh Souvannasing, Chanthala Vilayhong, Bryan L Stuart, Leila Srour, Paul N Newton
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  ABSTRACT: We describe two patients who developed severe illness after eating the skin and eggs of a toad, probably Bufo melanostictus Schneider, in southeastern Laos. One boy died, and one developed a digoxin toxicity-like syndrome with bradycardia and heart failure but survived. A telephone survey of 16 Lao provincial hospitals suggested that toad poisoning occurs in at least six provinces. That 93% of villagers in three villages in southeastern Laos were aware that toads are poisonous but that 51% had encountered patients with toad toxicity suggests that the potential gravity is not appreciated. These data indicate that toad poisoning may be underestimated and that education on the seriousness of toad toxins could be a useful public health measure.
  The American journal of tropical medicine and hygiene 12/2007; 77(5):850-3. · 2.59 Impact Factor
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  Available from: PubMed Central

  Article: Factors associated with a measles outbreak in children admitted at Mahosot Hospital, Vientiane, Laos.

  Mayfong Mayxay, Tiengthong Khomthilat, Phoutthalavanh Souvannasing, Khamphouvanh Phounesavath, Banlieng Vorasane, Sommay Keomany, Phouvieng Douangdala, Khamseng Philavong, Leila Srour, Paul N Newton
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  ABSTRACT: In 2002 and 2003 there were large outbreaks of measles in many provinces of Laos, including in Vientiane. We therefore conducted a study to determine risk factors associated with measles amongst children admitted at Mahosot Hospital, Vientiane. A retrospective case-control study was conducted in 50 children with clinical measles who were matched by age and sex with 50 healthy children (who had never had a febrile rash) living in the same villages as the cases. The proportion of children with complete immunizations was significantly lower in the group with clinical measles compared to the controls [13/50 (26%) vs 34/50 (68%), P < 0.001). The percentage of children who had received measles vaccine at 9-23 months of age was significantly lower in the group with clinical measles compared to the healthy controls [12/50 (24%) vs 24/50 (48%), P = 0.01). The family educational and socio-economic status did not differ significantly (P > 0.05) between cases and controls. These results emphasize the importance of intensification of measles immunization coverage in Laos. The strengthening of campaigns with large, widespread high second dose coverage is likely to be a key measure to prevent further measles outbreaks in Laos (192 words).
  BMC Public Health 01/2007; 7:193. · 2.00 Impact Factor
• Article: Factors associated with a measles outbreak in children admitted at Mahosot Hospital, Vientiane, Laos

  Mayfong Mayxay, Tiengthong Khomthilat, Phoutthalavanh Souvannasing, Khamphouvanh Phounesavath, Banlieng Vorasane, Sommay Keomany, Phouvieng Douangdala, Khamseng Philavong, Leila Srour, Paul Newton
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  ABSTRACT: Abstract Background In 2002 and 2003 there were large outbreaks of measles in many provinces of Laos, including in Vientiane. We therefore conducted a study to determine risk factors associated with measles amongst children admitted at Mahosot Hospital, Vientiane. Methods A retrospective case-control study was conducted in 50 children with clinical measles who were matched by age and sex with 50 healthy children (who had never had a febrile rash) living in the same villages as the cases. Results The proportion of children with complete immunizations was significantly lower in the group with clinical measles compared to the controls [13/50 (26%) vs 34/50 (68%), P < 0.001). The percentage of children who had received measles vaccine at 9–23 months of age was significantly lower in the group with clinical measles compared to the healthy controls [12/50 (24%) vs 24/50 (48%), P = 0.01). The family educational and socio-economic status did not differ significantly ( P > 0.05) between cases and controls. Conclusion These results emphasize the importance of intensification of measles immunization coverage in Laos. The strengthening of campaigns with large, widespread high second dose coverage is likely to be a key measure to prevent further measles outbreaks in Laos (192 words).
  BMC Public Health. 01/2007;