An 83-year-old female patient was admitted to the emergency department with progressive dyspnea and orthopnea for 3 days. She was discharged with warfarin therapy (5 mg per day) due to pulmonary embolism 5 months previously. On admission she was orthopneic and tachypneic. Her arterial blood pressure was 90/60 mmHg and heart rate was 115/min with sinus rhythm. On cardiac auscultation, S1 and S2 intensity were decreased, and pathologic murmur and pericardial friction were not observed. Other physical examination findings were unremarkable. An increased cardio-thoracic ratio was revealed on chest X-ray ( Figure 1a). Decreased QRS voltage and sinus tachycardia was evaluated on electrocardiogram. The internalised normalised ratio (INR) level was 8.6 and the prothrombin time was 70 seconds. Haemoglobin was determined to be 11.1 g/dL. The other laboratory findings were normal. An emergency thoracic computed tomography (CT) scan was performed to exclude recurrent pulmonary embolism, and surprisingly showed a massive pericardial effusion (Figure 1b). However, echocardiography revealed severe pericardial effusion that was compressing the right ventricle. Therefore, vitamin K and fresh frozen plasma infusion were administered promptly. As a result, the INR was decreased to 1.4 and 800 mL haemorrhagic fluid was drained percutaneously (P/S) with the apical approach. The patient's blood pressure, orthopnoea and dyspnoea improved dramatically. There was no other source of bleeding except haemopericardium. Consequently, the cardiac tamponade in our patient, secondary to haemopericardium, was considered to be the result of the incorrect dosage of Warfarin.
Spontaneous Isolated Pericardial Tamponade Associated with Warfarin