Clinical Laboratory Investigations and Antivenom Administration after Malayan Pit Viper (Calloselasma rhodostoma) Envenoming: A Retrospective Study from Southernmost Thailand

Musleeha Chesor Faculty of Medicine, Princess of Naradhiwas University, Narathiwat, Thailand;

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Janeyuth Chaisakul Department of Pharmacology, Phramongkutklao College of Medicine, Bangkok, Thailand;

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Panuwat Promsorn Galyani Vadhana Karun Hospital, Faculty of Medicine, Princess of Naradhiwas University, Narathiwat, Thailand;

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Wittawat Chantkran Department of Pathology, Phramongkutklao College of Medicine, Bangkok, Thailand

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ABSTRACT.

The Malayan pit viper (MPV: Calloselasma rhodostoma) is a medically important venomous snake causing numerous envenomations in Thailand. Administration of specific snake antivenom is the only effective treatment for MPV-envenomed patients. However, inappropriate administration or misuse of snake antivenom is problematic in some remote areas of tropical countries where the snakebite envenoming rate is notable. Currently, the indications for administration of MPV antivenom are focused mainly on hematological factors. These include 1) venous clotting time > 20 min, 2) unclotted 20-minute whole-blood clotting time, 3) international normalized ratio > 1.2, 4) platelet count < 50 × 103/μL, 5) systemic bleeding, and 6) impending compartment syndrome. We aimed to determine the association between laboratory data and antivenom administration in MPV-envenomed patients. A retrospective study of data from 2016 to 2021 in Narathiwat Province, the southernmost province in Thailand, was conducted. A total of 838 MPV-bitten patients were included in this study. Local effects and systemic effects were observed in 58.8% and 27.7% of patients, respectively. Coagulopathies, which range from abnormal blood clotting to systemic bleeding, represented the majority of systemic effects. Acute kidney injury developed in 2.5% of patients. In this study, 57.3% of patients were considered appropriate antivenom recipients. Interestingly, the present study revealed that local bleeding and mild to moderate thrombocytopenia became the independent factors for inappropriate use of MPV antivenom. Reeducation and supervision regarding the rational use of snake antivenom are needed to minimize the misuse of antivenom.

Author Notes

Data availability: The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Financial support: This research was supported by a Dr. Prasert Prasarttong-Osoth Research grant, which is administered by the Medical Association of Thailand under His Majesty the King’s Patronage. Additional funding was provided by the Phramongkutklao College of Medicine.

Authors’ addresses: Musleeha Chesor, Faculty of Medicine, Princess of Naradhiwas University, Narathiwat, Thailand, E-mail: musleeha.c@pnu.ac.th. Janeyuth Chaisakul, Department of Pharmacology, Phramongkutklao College of Medicine, Bangkok, Thailand, E-mail: jchaisakul@gmail.com. Panuwat Promsorn, Galyani Vadhana Karun Hospital, Faculty of Medicine, Princess of Naradhiwas University, Narathiwat, Thailand, E-mail: panuwat.p@pnu.ac.th. Wittawat Chantkran, Department of Pathology, Phramongkutklao College of Medicine, Bangkok, Thailand, E-mail: chantkran@yahoo.com.

Address correspondence to Wittawat Chantkran, Department of Pathology, Phramongkutklao College of Medicine, Her Royal Highness Princess Bejaratana Building, 317 Ratchawithi Rd., Ratchathewi District, Bangkok 10400, Thailand. E-mail: chantkran@yahoo.com
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