Aconite poisoning with arrhythmia and shock.

A 55-year-old male presented with history of nausea, vomiting, palpitation paresthesis and profuse sweating in emergency department 2h after ingestion of "Bachnaag" (Aconite) root. Examination revealed shock with irregular pulses. Initial ECG showed frequent multifocal ventricular ectopics (VE), which later turned to short runs of ventricular tachycardia (VT). Immediate gastric lavage was done and activated charcoal given. Patient was treated with fluid resuscitation without any improvement in blood pressure. Patient was started on nor-adrenaline infusion with gradual recovery from hypotension over a period of 6h, but support was continued for 48h. Amiodarone was started to control ventricular excitability, which persisted over 72h with gradual decrease in frequency of VT and VE. Patient was discharged with normal sinus rhythm on oral amiodarone on 5th day of hospitalization. On follow-up after 2 weeks patient was totally asymptomatic and amiodarone was stopped.

Case report

A 55-year-male presented in emergency department with history of epigastric burning, nausea, vomiting, dizziness, generalized paresthesia, palpitation, and profuse sweating of 2 h duration. Patient had no history of chest pain. Patient had past history of ischemic stroke 1-year back and residual left hemiparesis. After reading a book of traditional/Ayurvedic medicine, patient decided to self-medicate with “Bachnaag” (Aconite) root for residual hemiparesis. He procured Aconite root from Ayurvedic pharmacy and took about five gram of dried root of aconite plant. Patient became symptomatic within 1 h of taking aconite root (Fig. 1).

Fig. 1

(A) ECG at the presentation. (B) ECG after 24 h.

On examination, patient was anxious, sweating profusely and had pulse rate of 110/min, irregularly irregular, blood pressure of 80/50 mm of mercury, and respiratory rate of 26/min. Cardiovascular examination was normal, except for frequent ectopics and ventricular tachycardia. Neurological examination showed a conscious, coherent but anxious patient with residual left hemiparesis. Other systems were normal.

Electrocardiogram (ECG) obtained showed multifocal ventricular ectopics with bizarre complexes. Complete blood count, renal functions, and liver profile were normal. Serum electrolytes (sodium: 136 mEq/l, potassium: 3.8 mEq/l and magnesium: 1.8 mEq/l) and cardiac enzymes (creatinine phospho kinase-MB and troponin I) were normal. Patient was advised coronary angiography but he refused. Arterial blood gases (ABG) parameters were normal.

Immediate gastric lavage was done and activated charcoal given. Patient was treated with fluid resuscitation to maintain central venous pressure of 14 cm of H2O but there was no improvement in blood pressure. Patient was started on nor-adrenaline infusion. Blood pressure improved gradually over a period of 6 h but patient required inotropic support for next 48 h. As there was persistent multifocal ventricular activity, patient was also started on amiodarone infusion. Ventricular excitability persisted over 72 h with gradual decrease in frequency of ectopics. Patient was discharged in normal sinus rhythm on oral amiodarone on 5th day of hospitalization. On follow-up after 2 weeks patient was totally asymptomatic and amiodarone was stopped.

Discussion

Aconitum also known as aconite, monkshood, women's bane, devil's helmet, Queen of all Poisons, or blue rocket is a genus of over 250 species of flowering plants belonging to the family Ranunculaceae1, 2. In India, it is also called as Bachhnaag, Meetha Vish, Vatsanagaka, Vatsanabha or Visa vajranaga. Different species of Aconitum have been used for centuries both as poisons and medicines. It is still being used in traditional medicines of India, China, and Japan. The toxicity of the extracts follows the same order as the alkaloid content: roots, flowers, leaves, and stems.

Aconite is a fast-acting toxin. The active principles are aconitine and related alkaloids. Pure aconite 2 mg or aconite plant 1 g may cause death. Aconitine's toxicity is characterized by a burning sensation of the lips, tongue, mouth, and throat almost immediately following ingestion; it may be followed by numbness of the oral cavity and throat and difficulty in speech. Salivation, nausea, vomiting, dizziness, syncope, palpitation, and diarrhea may occur. There may be visual blurring or yellow-green color vision distortion, weakness, and incoordination. Toxicity mainly affects cardiovascular system and neuromuscular system. Refractory ventricular arrhythmias and refractory hypotension may lead to death.1, 2, 3, 4

The cardiotoxicity and neurotoxicity of aconitine and related alkaloids are due to their actions on the voltage-sensitive sodium channels of the cell membranes of excitable tissues, including the myocardium, nerves, and muscles. Aconitine binds with the voltage-sensitive sodium channels thereby causing a persistent activation of the sodium channels, which become refractory to excitation. Arrhythmia is triggered due to delayed after-depolarization and early after-depolarization. The arrhythmogenic properties of aconitine are also in part due to its anticholinergic effects mediated by the vagus nerve. It has hypotensive and bradycardic actions due to activation of the ventromedial nucleus of the hypothalamus. Through its action on voltage-sensitive sodium channels in the axons, aconitine blocks neuromuscular transmission by decreasing the evoked quantal release of acetylcholine.

Accidental toxicity and death have resulted when the plant has been consumed accidentally, possibly mistaken for wild parsley, horseradish, or other herbs growing in the wild.5, 6 Few reports of toxicity from western countries have been related to the use of traditional Chinese remedies sometimes with fatal outcome.7, 8 Most incidents of aconite toxicity have been reported from Asian countries with few case reports from India.2, 3, 4, 6, 9, 10, 11

Cardiac arrhythmias arising from aconite poisoning has been successfully treated with amiodarone and in resistant cases with charcoal hemoperfusion. Hypotension resistant to inotropes like dopamine and nor-adrenaline has been successfully treated with ventricular-assist device.

A case series published by Dwivwdi et al. with twelve patients highlights that cardiotoxic effects of “safe” herbs/minerals preparation are notuncommon. Other cardiotoxic herbs include well-known herbs like Digitalis, Areca catechu, and Belladonna and lesser known herbs like Thevetia peruviana, Cleistanus collinus, Mandragora officinarum, Ephedra distachya, and licorice.

Conflicts of interest

The authors have none to declare.