By Pat Anson, PNN Editor

Many U.S. hospitals have adopted policies that reduce or even eliminate the use of opioids during surgery, with the goal of lowering the risk of a patient later becoming addicted. That has resulted in greater use of spinal anesthesia as a substitute for general anesthesia.

During spinal anesthesia, non-opioid medications are used to numb the lower part of the body through an injection into the spinal column. During general anesthesia, a combination of opioids and other analgesics are administered intravenously or through a breathing tube to sedate patients.

But a large new study suggests that spinal anesthesia may actually increase the use of prescription opioids – at least when it comes to hip fracture surgeries.

In an analysis of 1,600 patients who had surgery to repair hip fractures, researchers at the University of Pennsylvania Perelman School of Medicine found that patients who received spinal anesthesia reported more pain in the 24 hours after surgery than those who receive general anesthesia. They were also more likely to be using prescription opioids 60 days after surgery.

“In our study, patients who got spinal anesthesia did get fewer opioids in the operating room, but they ended up having more pain, and more prescription pain medication use after surgery,” said lead author Mark Neuman, MD, an associate professor of Anesthesiology and past chair of the Penn Medicine Opioid Task Force.

“While our study can’t determine conclusively whether this was due to the spinal anesthesia itself or the fact that fewer opioids were given up front, this is a result that should make people examine some of the assumptions informing current care pathways.”

The study findings, published this week in The Annals of Internal Medicine, show patients had their worst pain the day after surgery. Spinal anesthesia patients rated their pain an average of 7.9 (on a zero to 10 pain scale), slightly higher than the average of 7.6 reported by those under general anesthesia.

Researchers say 25 percent of patients in the spinal anesthesia group were using prescription opioids 60 days after surgery, compared to 18.8 percent of patients in the general anesthesia group. There were no significant differences in prescription pain medicine use after six and 12 months, but Neuman is wary of what he saw.

“Even though the 180- and 365-day findings are not statistically significant, the 60-day finding is still concerning, since there could be medication-related harms like respiratory depression or over-sedation that could still occur over the short term,” Neuman said.

Neuman and his colleagues found no significant differences in patient satisfaction, pain levels or mental health status after 60, 180 or 365 days between the spinal anesthesia and general anesthesia groups.

More than 250,000 older Americans suffer hip fractures every year and nearly all are repaired through surgery. In the past, most would receive general anesthesia, but in recent years the use of spinal anesthesia has increased significantly, due in part to the belief by some anesthesiologists that it was safer for frail, older patients.  

Elimination of Opioids Has “Unintended Safety Risks’

There is a growing reluctance on the part of surgeons to eliminate the use of opioid anesthesia or to allow patients to opt out of opioids during surgery.

In an op/ed recently published in The Conversation, three physicians at the University of Michigan Medical School called opioid medication “an essential tool in the operating room.”  

“Opioids stand out among the typical sedatives and anesthetics used in the operating room by significantly reducing the amount of other drugs needed to achieve pain relief, sedation and loss of consciousness,” wrote Drs. Mark Bicket, Jennifer Waljee and Paul Hilliard. 

“Whether or not patients receive opioids during surgery doesn’t affect how likely they are to continue using opioids or receive an opioid prescription afterward. We believe that wholesale elimination of opioids without considering the unique setting of the operating room may lead to unintended safety risks for patients. A more nuanced care plan that relies on reduced amounts of opioids could set patients up for a faster recovery with fewer side effects and better outcomes after surgery.”  

Seven states currently allow patients to sign non-opioid directives telling their physicians not to treat them with opioids. Congress is considering bills in the House and Senate that would allow patients to make similar directives nationwide. Although both bills allow providers to override a patient’s directive in special circumstances, Bicket, Waljee and Hilliard are concerned the directives will lead to unsafe care.

“We have seen medical practice shift from embracing opioids to eliminating them altogether. We believe that opioids serve an essential tool in the operating room for many patients, and avoiding them for certain cases can make it difficult if not impossible to avoid harming patients,” they wrote.