Predictors of Clot Retention Post-monopolar Transurethral Resection of the Prostate at Muhimbili National Hospital, Dar es Salaam, Tanzania

For millions of aging men around the world, a common and often frustrating condition develops as the prostate gland, a small organ sitting just below the bladder, slowly grows larger. This enlargement can squeeze the tube that carries urine out of the body, leading to a difficult and painful struggle to empty the bladder. When medicines cannot solve the problem, surgeons often turn to a procedure called a transurethral resection. In this operation, a surgeon passes a thin instrument through the urethra to carefully shave away the excess prostate tissue, opening the path for urine to flow freely again. While this surgery is a standard and highly effective treatment, it carries a specific risk: the raw surface left behind on the prostate can bleed. If that blood clots inside the bladder before it can be washed out, it creates a blockage known as clot retention. This complication forces patients to stay in the hospital longer, causes significant discomfort, and sometimes requires doctors to perform additional, urgent procedures to clear the obstruction.

In a recent study conducted at Muhimbili National Hospital in Dar es Salaam, Tanzania, researchers set out to understand exactly who is most likely to face this complication after the surgery. The team followed 220 men who underwent the standard monopolar version of this procedure, a technique that uses electrical current to cut and cauterize tissue. By tracking these patients from before the operation until they were discharged, the researchers wanted to find the specific factors that predicted whether a man would develop a clot blockage. Their goal was not just to count how often it happened, but to identify the warning signs that could help doctors prepare better and keep patients safer.

The study revealed that clot retention is a significant issue in this setting, occurring in roughly one out of every eight patients. On average, if a blockage did occur, it happened about eleven hours after the surgery was finished. The researchers found that the risk was not random; instead, it was tied to four very specific conditions that could be identified before or during the operation. The most powerful warning sign was the need for a blood transfusion while the surgery was still in progress. Men who required a transfusion were far more likely to develop a clot blockage later, suggesting that heavy bleeding during the operation is a major red flag for future problems.

Beyond the blood loss itself, the duration of the surgery played a critical role. The team discovered a clear pattern where the longer the surgeon spent removing tissue, the higher the chance of a clot forming. Operations that lasted longer than an hour carried a much greater risk than shorter ones, and those extending beyond ninety minutes presented an even steeper danger. Similarly, the amount of tissue removed mattered. When the surgeon had to cut away a large volume of prostate tissue, the risk increased significantly. Finally, the study pointed to a specific blood test result taken before the operation. Men whose blood took longer than a certain threshold to clot, a measure known as the partial thromboplastin time, were much more likely to experience retention, even if they had no known history of bleeding disorders.

Interestingly, the study found that other factors often assumed to be risky did not show a strong link to clot retention in this group. Things like the patient's age, whether they had other health conditions like diabetes or high blood pressure, or the specific size of the catheter used after surgery did not significantly change the odds of a blockage. This suggests that the physical reality of the surgery itself—how long it took, how much was removed, and how much bleeding occurred—matters more than the patient's general health profile in predicting this specific complication.

The findings offer a clear path forward for improving care. Because the risk factors are measurable, doctors can now identify high-risk patients before the surgery even begins. For a man with a large prostate, a blood test showing slow clotting, or a situation where the surgery is expected to take a long time, the medical team can prepare for a higher likelihood of complications. This might mean keeping a closer watch on the patient's bladder drainage in the first day after surgery, ensuring that irrigation fluids are flowing smoothly, or being ready to intervene quickly if a blockage starts to form. By focusing on these specific, observable factors, hospitals can move away from treating every patient the same way and instead tailor their care to the individual risks each man faces, potentially reducing the number of painful complications and helping patients recover more quickly.