However, these medications also increase the risk of bleeding, including coughing up blood.
The doctors treating the patient were "astonished" after they unfurled the clot to find it had retained the shape of the lung pathway from which it came.
The patient had a violent coughing fit in hospital a week after surgery to fit him with a pacemaker in case his heart became blocked.
"An Impella ventricular assist device was placed for management of acute heart failure, and a continuous heparin infusion was initiated for systemic anticoagulation".
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The pulmonary surgeon Dr Georg Wieselthaler told The Atlantic when he carefully spread out the clot, realising it was the flawless shape, he was "astonished".
It's less rare for patients to cough up bronchial "casts" made of other substances, such as lymph or mucus. "It's a curiosity you can't imagine-I mean, this is very, very, very rare".
Sadly, a week after the man coughed up the clot, he died due to complications from heart failure despite being fitted out with the ventricular assistance device.
The 25-year-old mum went on to recover fully and delivered a healthy, full-term baby soon after.
When Wieselthaler and his team delicately spread out the clot, they discovered "that the architecture of the airways had been retained so perfectly that they were able to identify it as the right bronchial tree based exclusively on the number of branches and their alignment".