Blood thinners are widely used medicines that help prevent dangerous blood clots.
Many older adults take these medications to reduce the risk of heart attacks, strokes, and other serious problems caused by blocked blood vessels.
Doctors often prescribe blood thinners to people who have heart disease, irregular heart rhythms, or a history of clotting problems.
Although these medicines help prevent clots, they also increase the risk of bleeding. Because of this, doctors often tell patients to stop taking blood thinners before surgery. The goal is to reduce the chance of excessive bleeding during the operation.
However, new research suggests that stopping these medications for too long may also create risks. A study from researchers at the University of Missouri School of Medicine has found that delaying blood thinner use too much before and after surgery could lead to more complications.
The findings were recently published in the medical journal The Laryngoscope.
In the study, researchers examined the medical records of 470 patients who underwent a procedure known as free flap reconstruction.
This type of surgery is often used in head and neck cancer treatment. During the operation, surgeons take healthy tissue from one part of the body and transplant it to another area that needs repair or rebuilding.
Free flap reconstruction is a complex procedure that requires careful control of blood flow.
The transplanted tissue must quickly connect to new blood vessels so that it receives enough oxygen and nutrients to survive. If blood flow is disrupted, the transplanted tissue can fail.
Because blood circulation is so important in these surgeries, managing blood thinners correctly is a major concern for surgeons.
The research team wanted to understand how the timing of stopping and restarting blood thinners affects surgical outcomes. They found that most blood-thinning medications did not increase complications on their own. Instead, the biggest problems appeared when the medications were stopped too early before surgery or restarted too late afterward.
Across the study group, about 17 percent of patients experienced complications. This number included patients who were not taking blood thinners at all. However, patients who had their medications stopped for longer periods showed a higher rate of complications.
Dr. Megan Gillespie, the lead author of the study and a resident physician in otolaryngology, explained that doctors face a difficult balance when managing blood thinners around surgery.
On one side is the risk of excessive bleeding during or after the operation. On the other side is the risk of blood clots forming if the medication is stopped for too long. Both situations can threaten the success of the surgery.
The researchers found that the timing of restarting blood thinners after surgery appears to be especially important. In the patients studied, the average time before restarting blood thinners was about five days after surgery.
However, Dr. Patrick Tassone, one of the study authors and an associate professor of otolaryngology at the University of Missouri School of Medicine, believes that waiting this long may not always be necessary.
In his own clinical practice, Tassone said he often feels comfortable restarting blood thinners about 48 hours after surgery, as long as the patient has not experienced a bleeding complication. Restarting the medication earlier may help reduce the risk of dangerous blood clots without significantly increasing bleeding.
Still, the researchers caution that more data is needed before firm medical guidelines can be established.
Free flap reconstruction surgeries in the head and neck are already highly successful. About 95 percent of these operations succeed in restoring healthy tissue and function. However, when complications occur, they can be serious. Problems such as bleeding, clotting, or failure of the transplanted tissue may require additional surgery.
Understanding how to safely manage blood thinners during the surgical period could help improve these outcomes even further.
Dr. Tassone explained that there is currently no universal standard for how to manage blood thinners around surgery. One reason is that many earlier studies were conducted before newer blood-thinning medications became widely used. As a result, doctors often rely on personal experience and individual judgment when deciding when to stop and restart these drugs.
The new study helps begin an important conversation about how to find the safest balance.
The researchers describe the challenge as finding a “sweet spot.” Doctors need to stop blood thinners long enough to reduce the risk of bleeding during surgery, but not so long that patients develop dangerous blood clots.
By studying real-world outcomes in hundreds of patients, the team hopes their work will guide future research and eventually lead to clearer medical recommendations.
The study was led by Dr. Megan Gillespie and Dr. Patrick Tassone at the University of Missouri School of Medicine. Other contributors included medical student Dylan Hood, biostatistics director Alok Dwivedi, and otolaryngologist Dr. Tabitha Galloway from MU Health Care.
Their research, titled “Bleeding, Clotting, and Flap Failures: Management of Blood Thinners in Head & Neck Free Flaps,” was recently published in The Laryngoscope.
In the end, the study highlights how small decisions in medical care—such as the timing of medication changes—can have a big impact on surgical success. With more research, doctors may be able to develop clearer guidelines that protect patients from both bleeding and clotting risks.
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