Relevance of a Systematic Screening Strategy for Obstructive Sleep Apnea before Thoracic Surgery: A Prospective Monocentric Study

Sleep is often thought of as a time when the body rests and repairs itself, but for some people, breathing becomes a struggle even while they are unconscious. A condition known as obstructive sleep apnea occurs when the muscles in the throat relax too much during sleep, causing the airway to narrow or close completely. This blockage forces the person to stop breathing for short periods, leading to sudden drops in oxygen levels and frequent, brief awakenings that the sleeper rarely remembers. While these events might seem minor in isolation, they place significant stress on the heart and lungs, and over time, they can lead to serious health problems. The condition is surprisingly common, affecting a large portion of the adult population, yet it frequently goes unnoticed because the symptoms, such as daytime tiredness or loud snoring, are often dismissed as normal signs of aging or a busy lifestyle. This lack of awareness becomes particularly dangerous when a patient is scheduled for major surgery, as the stress of an operation and the use of pain medications can worsen breathing difficulties, potentially leading to complications after the procedure.

Researchers at the University Hospital of Tours in France decided to investigate how often this hidden condition appears in patients preparing for thoracic surgery, which involves operations on the chest, lungs, or heart. They knew that patients undergoing these specific surgeries are already at high risk for breathing issues, but they wanted to know how many of them were also suffering from undiagnosed sleep apnea. To find out, the team contacted eighty-one patients who were scheduled for these procedures. They could not examine the patients in person for the initial check, so they conducted a screening over the phone. The process involved asking a series of straightforward questions about sleep habits, such as whether the person snores loudly, if they feel excessively tired during the day, or if anyone has ever watched them stop breathing while asleep. They also gathered information about the patient's age, gender, body weight, and whether they had other health issues like high blood pressure or diabetes. Based on the answers, the researchers identified which patients were at high risk and needed a more detailed examination.

Those identified as high risk were sent home with a device to record their sleep patterns for one night. This home test, known as polysomnography, tracks breathing, oxygen levels, and brain activity to confirm a diagnosis. The results were striking. Out of the fifty patients who completed the screening process, thirteen were sent for the home sleep test. Of those thirteen, ten were found to have obstructive sleep apnea severe enough to require treatment with a machine that gently blows air into the lungs to keep the airway open during sleep. This meant that twenty percent of the screened patients had a serious condition that they did not know they had. When the researchers looked at the entire group of eighty-one people they initially contacted, they found that a total of eighteen patients, or twenty-two percent, had the condition. This included the ten newly discovered cases and eight others who had already been diagnosed and were using the treatment machine before the study began.

The study also looked at what happened to these patients after their surgeries. The researchers compared the recovery of the newly diagnosed patients who started using the air pressure machine before their operation against those who did not have the condition. The outcomes were encouraging. Among the ten patients who were newly diagnosed and treated with the machine, only one needed extra oxygen for more than two days after surgery, and none of them developed serious infections or required transfer to an intensive care unit. In contrast, the group of patients without a diagnosis of sleep apnea experienced more complications, including a higher number of fevers, infections, and cases where patients needed close monitoring in the intensive care unit due to breathing difficulties. This suggests that identifying and treating the condition before surgery might help prevent these postoperative problems.

However, the researchers also noted a significant challenge in the long term. One year after the study began, half of the patients who had been newly diagnosed and prescribed the treatment machine had stopped using it. Some stopped because of discomfort with the equipment, while others cited postoperative pain as the reason. Despite this drop in adherence, the initial findings remain important. The study demonstrates that it is possible to systematically screen for this hidden breathing disorder in patients facing major chest surgery, even within the tight schedules often required for cancer treatments. By integrating simple questionnaires and rapid testing into the standard preoperative care plan, hospitals can identify patients who need extra support. The authors suggest that this approach fits well into modern surgical recovery programs designed to get patients back on their feet quickly. While the study was conducted at a single hospital and involved a relatively small number of people, the high rate of undiagnosed cases found in this group highlights a critical gap in patient care. Identifying these patients before they enter the operating room offers a practical way to improve their safety and recovery, turning a hidden risk into a manageable condition.