Shared decision-making is an integral step in lung cancer screening with low-dose CT (LDCT) in high-risk patients, but a cross-sectional study at two academic medical centers in Texas has found wide variability in the quality of shared decision-making encounters and that nearly a third of patients reported being conflicted about their decisions to pursue screening.
Dr. Shawn Nishi
Lead author Shawn P.E. Nishi, MD, associate professor in the division of pulmonary critical care and sleep medicine, department of internal medicine, of the University of Texas Medical Branch, Galveston, noted two striking findings of the study, published in Chest: that physicians rarely used decision aids according to Centers for Medicare & Medicaid Services direction, and that a “considerable imbalance” exists in the way physicians present management choices to patients. “As physicians, we want to focus on the positive,” she said, “but in shared decision-making (SDM) there needs to be a better balance between presentation and understanding of the risks and the benefits of lung cancer screening (LCS).”
Since 2015, CMS has reimbursed for LCS counseling and an shared decision-making visit before a patient has the screening.
The study analyzed self-reported survey results of 266 patients who had been through SDM at UTMB Galveston and MD Anderson Cancer Center in Houston in 2017. They completed patient surveys the following year. The study population was 87% White, 38% had a family history of lung cancer, and 39% were current smokers. The mean pack-year history was 40.4 years.
A high percentage – 86.6% – said they were satisfied with the level in which they were involved in their screening decision. Patients reported that their doctors talked to them about the benefits of LCS far more frequently than the potential harms, 68.3% to 20.8%. And 12.5% said they understood that an abnormal scan was likely to result in a negative finding. Only 30.7% said they’d received educational materials about LCS during the screening process.
A year after completing the SDM process, their knowledge of LCS was variable at best; on average, they answered 41.4% of the questions correctly, and almost one-third (31%) indicated that screening, rather than quitting smoking, was the best way reduce their lung cancer risk.
The study noted that, for patients who derive a small benefit from LCS, the absolute risk reduction is only 0.3%, which may not be enough to offset the potential harms of LDCT.
“The LCS exam itself is a simple noninvasive procedure; you get a scan and go about your day once it’s read,” Dr. Nishi said. “However there is a high false-positive rate, and the question really becomes that, as you start to work up those false positives and even true positives, however small, there is a risk associated with every procedure or evaluation thereafter. So the shared decision-making process is really there to ensure that patients value finding their lung cancer early if they do have it versus the potential harms down the line.”
However, as this study points out, there aren’t many parameters for what SDM entails. “It’s more than just an information exchange back and forth,” Dr. Nishi said. “It’s about having good-quality communication between the provider and patients so that the right decision can ultimately be made for each patient. It takes a very dedicated person that can commit the time and expertise to it. I don’t think that it should be taken lightly.”
As Dr. Nishi and colleagues pointed out in their study, SDM incorporates three essential elements: recognizing and acknowledging that a decision has to be made, knowing and understanding the best available evidence, and incorporating the patient’s own values and preferences in the decision.
CMS outlines specific components of SDM. It includes, beyond a discussion of the potential benefits and harms and use of a decision aid, education on the need for adherence to annual screening, and counseling on either stopping smoking or continued abstinence.
For physicians, dedicating the time and energy SDM needs can be a challenge, Dr. Nishi noted, “Health care doesn’t have a lot of support to perform shared decision-making,” she said. “In a very busy practice it’s very hard to make sure you have a good process where you can sit down and take all the time you need with a patient to open up a dialog about the risks and benefits.”
After they completed the screening process, 33.6% of patients said they had some conflicting feelings about their decision. Non-White patients were about four times more likely than White patients to feel conflicted about their choices (odds ratio, 4.31; 95% confidence interval, 1.36-13.70), as were former smokers, compared with current smokers (OR, 1.93; 95% CI, 1.04-3.55).
Future studies of SDM in LCS should focus on outcomes, said Dr. Nishi. “Hopefully then we can focus on those things that benefit patients the most.”
Abbie Begnaud, MD, FCCP, a pulmonologist at the University of Minnesota, Minneapolis, said this study confirmed what other studies found about shortcomings of SDM, with one difference. “We already knew we were not doing a great job at shared decision-making,” she said. “To me, the difference in this study is that most of the patients were pretty satisfied with their degree of involvement.”
She noted the low percentage of patients who understood that abnormal scans may be noncancerous. “This is one area that I think is an important place for us to improve,” Dr. Begnaud said.
The findings about non-White patients and former smokers are also telling, Dr. Begnaud said. “This highlights that we need to pay close attention to these two groups – people who have traditionally, historically been marginalized in medical care – and provide them the support they need to make a decision.”
Dr. Nishi and colleagues have no relevant disclosures. The study was supported by the Cancer Prevention and Research Institute of Texas and received grants from the National Cancer Institute and the University of Texas MD Anderson Cancer Center Duncan Family Institute for Cancer Prevention and Risk Assessment. Dr. Begnaud has no relevant relationships to disclose.