```
These pigs needed to be observed for many days after surgery in order to obtain experimental data. Every day they had to undergo a variety of tests such as heart surface ultrasound, brain MRI, lung CT, and even angiography to see if any debris had formed that could lead to embolism in important organs.
To monitor the condition of the heart, they also had to perform a 24-hour dynamic electrocardiogram to dynamically observe cardiac electrical activity and understand if the surgery might interfere with the electrocardiogram.
Blood was drawn for various tests, such as coagulation functions, to see if blood clots formed after myocardial resection, as blood clots also have the potential to embolize.
Professor Xin decided to stay a few more days to observe the postoperative condition of these pigs and follow up on Teng Xinmei's surgery.