Management of Rodenticide Poisoning Associated with Synthetic Cannabinoids

Conclusion

In addition to bleeding as a result of coagulopathy, this patient presented with new onset of AF with rapid ventricular response and a newly diagnosed cardiomyopathy. Although the patient had other cardiovascular risk factors, such as hypertension, dyslipidemia, and a remote history of cocaine use, it is likely that the use of the synthetic cannabinoids contributed to the development and/or worsening of this arrhythmia and cardiomyopathy. The patient remained in AF 6 weeks after hospital discharge with a controlled ventricular rate on metoprolol and digoxin. An interval echocardiogram 6 weeks after hospital discharge showed a recovered ejection fraction. In cases of tachycardia-induced cardiomyopathy, the ejection fraction often recovers with control of the tachycardia. The patient was weaned off vitamin K about 6 months after his initial presentation and started on a DOAC for anticoagulation. He subsequently underwent a transesophageal echocardiogram followed by an attempt at DC cardioversion; however, he did not remain in sinus rhythm and is being continued on anticoagulation and rate control for his AF.

Although unclear how synthetic cannabinoids became adulterated with a potent vitamin K antagonist, health care practitioners should consider this if a patient presents with unexplained coagulopathy and widespread bleeding. Fixed-dose PCC should be considered as an alternative to weight-based dosing in these cases. Physicians and pharmacy personnel should anticipate a need for long-term high doses of vitamin K in order to begin work early to obtain sufficient supplies to treat presenting patients.