Should warfarin be discontinued before a dental extraction? A decision-tree analysis

Area of Science:

• Cardiology
• Oral Surgery
• Pharmacology

Background:

• Warfarin is an anticoagulant medication commonly prescribed for patients with prosthetic heart valves to prevent thromboembolism.
• Dental extractions pose a risk of bleeding, which can be exacerbated in patients taking anticoagulants like warfarin.

Purpose of the Study:

• To determine the optimal management strategy for warfarin therapy in patients with prosthetic heart valves undergoing a single tooth extraction.
• To compare the expected utility of withholding versus continuing warfarin before dental procedures.

Main Methods:

• A quantitative decision tree model was employed to analyze two management strategies: withholding warfarin and continuing warfarin.
• Probabilities and utilities for outcomes such as cardiovascular accident and major bleeding were derived from existing medical literature.

Main Results:

• The analysis indicated a slight preference for withholding warfarin, yielding an optimal expected utility value of 0.976 utile.
• Continuing warfarin resulted in an expected utility value only 0.02 utile lower than withholding it, suggesting a marginal benefit.

Conclusions:

• The decision to withhold or continue warfarin before a dental extraction is primarily influenced by the comparative risk of major bleeding associated with each management strategy.
• The potential consequences of a cardiovascular accident appear to be a less significant factor in this decision-making process.