"Sedation doesn't help, but it does add expense and risk," says study leader Steven P. Cohen, M.D., a professor of anesthesiology and critical care medicine at the Johns Hopkins University School of Medicine. "In some places, every patient is being sedated. Our research shows it should be used very sparingly."
Nerve blocks, performed by injecting anesthetics and/or steroids into any number of areas of the body, from the spinal column to the hip joint, are often performed ahead of surgery and in addition to other invasive procedures, such as the ablation of nerves to treat arthritis in the back, to more accurately pin down the source of pain. If the nerve block fails to numb pain, surgery or the nerve ablation may not help. Increasingly, physicians have used light or even deep sedation in a bid to ease anxiety and pain while the injection is given.
However, results of the new study, reported online Feb. 13 in the journal Pain Medicine, show that sedation before a nerve block significantly increases false-positive results, which means patients are more likely to be sent in for surgeries and other procedures that won't cure the underlying pain. Another worry, Cohen says, is the health risk when someone is sedated.
Cohen and researchers from several other medical centers in the United States recruited 73 patients with back or limb pain who were scheduled to receive multiple nerve blocks. Roughly half of the group received the first injection with sedation and the second without. The remaining patients received their injections in the opposite order. Patients were given six-hour pain diaries, a routine step that helps patients determine whether the injections bring relief, and were asked to rate their satisfaction with the treatment. They were also seen a month later and asked to rate their pain and function after the treatment.
Although the sedated patients reported less pain immediately after the nerve block injection, on every other measure — from 30-day pain assessments to overall patient satisfaction — the results were the same whether or not they were sedated.
"A lot of cost for very little benefit," Cohen says.
The increase in false-positive results — the belief that the pain has been relieved when it has not been — can result from many factors, Cohen says. The medication used for the sedation itself can have pain-relieving properties. The sedative can relax muscles. Patients may need to take extra time away from daily activities after being under anesthesia, and that rest alone could make the patient feel better.
But if patients believe that the nerve block eased their underlying pain, the physician will often conclude he or she has found the source and will move ahead with the appropriate treatment, which may include spinal fusion or radiofrequency ablation of nerves for arthritis, Cohen says. In the end, he says, many patients end up back at square one — still in pain, but having suffered through a potentially unnecessary operation.
Cohen says that while many physicians may use sedation in a sincere effort to make the procedure less traumatic for patients, there is also a perverse financial incentive to use it.
"Unfortunately, medicine in many places has become a business. The fact is, you get paid more money to do the procedure with sedation," he says. "The costs of anesthesia can be more than the fee for the procedure itself. And patients are getting harmed."
The research was funded by the Center for Rehabilitation Sciences Research, part of the Uniformed Services University of the Health Sciences in Bethesda, Md.
Haroon Hameed, M.D., and Michael E. Erdek, M.D., both of Johns Hopkins, contributed to this study, as well as researchers from Walter Reed National Military Medical Center in Bethesda; the Uniformed Services University of the Health Sciences; the Mayo Clinic in Scottsdale, Ariz.; the Cleveland Clinic in Ohio; and the University of Florida in Gainesville.
Johns Hopkins Medicine (JHM), headquartered in Baltimore, Maryland, is a $6.7 billion integrated global health enterprise and one of the leading health care systems in the United States. JHM unites physicians and scientists of the Johns Hopkins University School of Medicine with the organizations, health professionals and facilities of The Johns Hopkins Hospital and Health System. JHM's vision, "Together, we will deliver the promise of medicine," is supported by its mission to improve the health of the community and the world by setting the standard of excellence in medical education, research and clinical care. Diverse and inclusive, JHM educates medical students, scientists, health care professionals and the public; conducts biomedical research; and provides patient-centered medicine to prevent, diagnose and treat human illness. JHM operates six academic and community hospitals, four suburban health care and surgery centers, and more than 30 primary health care outpatient sites. The Johns Hopkins Hospital, opened in 1889, was ranked number one in the nation for 21 years in a row by U.S. News & World Report.Media Contacts:
Stephanie Desmon | EurekAlert!
Nanoparticles as a Solution against Antibiotic Resistance?
15.12.2017 | Friedrich-Schiller-Universität Jena
Plasmonic biosensors enable development of new easy-to-use health tests
14.12.2017 | Aalto University
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
15.12.2017 | Power and Electrical Engineering
15.12.2017 | Materials Sciences
15.12.2017 | Life Sciences