Response to: Risk of hemorrhagic stroke after venomous snakebite: correspondence.

The correspondents call attention to unmeasured confounders such as anticoagulants and occupations that might have a moderating or mediating effect on the association between venomous snakebite and subsequent risk of hemorrhagic stroke in our study.[1] However, the limited availability of up-to-date data in the National Health Insurance Research Database (NHIRD) impedes a complete answer to the question pose. We searched for traumatic ICH using the International Classification of Diseases, 9th Revision, Clinical Modification (ICD-9-CM) codes 800-804 and found that the patients with hemorrhagic stroke in our study did not have a traumatic ICH as the cause. First, non-vitamin K antagonist oral anticoagulants (NOACs) are covered by Taiwan national health insurance since 2012, less data we could get about the correlation between NOACs and hemorrhagic stroke. [Extracted from the article]