Cardiotoxic Effects of Micrurus surinamensis (Cuvier, 1817) Snake Venom

• DOI: 10.1007/s12012-021-09640-7
• Publication Date: 2021-02-10T02:59:56Z
• Authors: Lilian de Paula G...; Ana Flávia Machad...; Clara Rojo Novais; Aparecida Tatiane...; Maira Souza Olive...; Marina Guimarães ...; Cesar Bonilla; Carlos Chavez-Oló...; Marília Martins Melo
• Keywords: Elapid Venoms; Male; Time Factors; Guinea Pigs; Arrhythmias, Cardiac; Coral Snakes; Ventricular Premature Complexes; Cardiotoxicity; 3. Good health; Necrosis; 03 medical and health sciences; 0302 clinical medicine; Heart Rate; Animals; Myocytes, Cardiac; Atrial Premature Complexes; Atrioventricular Block; Muscle, Skeletal

Micrurus surinamensis is a coral snake from the Elapidae family of wide distribution in Amazonia Forest. Its venom contains neurotoxins that induce muscular and respiratory paralysis; however, its cardiovascular action is not yet characterized. The aim of this study was to investigate the cardiotoxic effects caused by M. surinamensis poisoning in rodents. Twelve guinea pigs (Cavia porcellus) were distributed in two groups (n = 6) named as control and envenomed. The control group received 0.2 ml of PBS/BSA via intramuscular injection (IM), while envenomed animals received 0.75 µg of venom per g of body weight, also via IM. Electrocardiographic examination (ECG) and biochemical serum tests were conducted before and 2 h after inoculation. ECG of the envenomed animals revealed severe progressive arrhythmias including atrioventricular block, supraventricular, and ventricular extrasystoles. Serum biochemistry showed significant increase in CK, CK-MB, and LDH enzymes corroborating the skeletal and cardiac muscle damage. Myonecrosis and degeneration were observed in both skeletal and heart muscle; nevertheless, transmission electron microscopy revealed cardiac muscle fibers fragmentation. In conclusion, M. surinamensis venom has a potent cardiotoxic activity eliciting arrhythmogenic effects and heart damage after only 2 h of envenomation.