Current concepts of warfarin therapy.

Area of Science:

• Pharmacology
• Hematology
• Medical Thrombosis

Background:

• Oral anticoagulants are frequently prescribed for numerous indications.
• The full spectrum of risks associated with oral anticoagulant therapy is not always appreciated.
• Established indications include prophylaxis of venous thrombosis post-hip surgery, prevention of deep venous thrombosis and pulmonary emboli, arterial emboli prevention in high-risk cardiac patients, and thrombosis prophylaxis in hereditary thrombophilias.

Purpose of the Study:

• To review the indications for oral anticoagulant use.
• To highlight the risks associated with oral anticoagulant therapy.
• To discuss the management of bleeding complications and recognized adverse events.

Main Methods:

• Literature review of oral anticoagulant indications and risks.
• Analysis of current recommendations for therapeutic ranges.
• Discussion of treatment strategies for bleeding and adverse effects.

Main Results:

• Oral anticoagulants have diverse prophylactic and therapeutic applications.
• Warfarin sodium is contraindicated during pregnancy.
• Recommended prothrombin time (PT) targets are now lower (1.5-2.0 times control).
• Bleeding is the primary risk, managed with vitamin K or plasma.
• Warfarin-induced skin necrosis and purple-toe syndrome occur more often than previously thought.

Conclusions:

• Oral anticoagulants are essential but require careful risk-benefit assessment.
• Awareness of potential complications, including bleeding, skin necrosis, and purple-toe syndrome, is vital.
• Adherence to updated therapeutic PT ranges is recommended for optimal safety and efficacy.