Navigation Links
Anesthetic approach stops pain without affecting motor function

BOSTON, Mass. - One of the holy grails of local anesthesia is the ability to achieve a long-lasting nerve block that eliminates pain sensation while not affecting motor function. Now, researchers at Children's Hospital Boston have discovered an anesthetic approach that seems to do just that. If it proves to work in humans as well as it did in rats, it could be useful in a variety of medical applications, providing, for example, a local anesthetic for childbirth that would block pain without interfering with the mother's ability to push, or for musculoskeletal disorders in which it is important to maintain mobility.

The discovery was reported in the online Early Edition of the Proceedings of the National Academy of Sciences during the week of February 1.

The researchers, led by Daniel Kohane, MD, PhD, of the Division of Critical Care Medicine at Children's, originally sought only to find an agent that would prolong the anesthetics' effects. They focused on surfactants, a subclass of so-called "chemical permeability enhancers" that enable drugs to spread more easily throughout a tissue.

In testing three kinds of surfactant along with the anesthetics QX-314 and QX-222 (both derivatives of lidocaine), they found that this approach did prolong the sensory block in rats' sciatic nerves, for up to 7 hours or more depending on the surfactant, but didn't prolong motor impairment; in some cases the motor block was absent or of very short duration. In the rats, this meant they were able to tolerate having their paws on a hot plate for long periods, yet still able to balance and bear weight on their legs.

"This was a surprise finding," says Kohane, who also directs the Laboratory for Biomaterials and Drug Delivery (LBDD) at Children's. "What we've discovered really is a new approach; the question now is to figure out the mechanism by which it works and look at the effects of other chemical permeability enhancers."

Kohane speculates that surfactant made the anesthetic better able to penetrate sensory nerves, which have little or none of the fatty coating known as myelin, whereas in motor neurons, which have abundant myelin, the active drug gets trapped in the myelin, never entering the nerve itself.

The lab's next steps will be to explore the effects of different permeability enhancers and examine their safety, since at high doses the drug combination could potentially be toxic to the nerves. The eventual plan is to test the approach in larger animals.

A parallel approach to achieving a pain-specific nerve block was proposed in 2007 by Clifford Woolf, MD, PhD, recently appointed director of the Children's Hospital Boston Program in Neurobiology. Woolf's team combined QXT-314 with capsaicin, which opens cellular gates that are only present in sensory neurons, and achieved pain-specific blocks in rats lasting 2 hours or more.


Contact: Erin McColgan
Children's Hospital Boston

Related medicine news :

1. Anesthetic Approach Stops Pain Without Affecting Motor Function
2. General anesthetics lead to learning disabilities in animal models
3. Finding of genetic region controlling cardiovascular sensitivity to anesthetic propofol
4. Mass. General team develops potentially safer general anesthetic
5. Cesarean section: Local anesthetic reduces need for painkillers post-op
6. As Fire Ants Continue to Proliferate, Hospital-Proven Burn Anesthetic Brings Instant Relief for Bites, Stings
7. Milestone Scientific Hosts Second Annual Symposium on Computer-Controlled Local Anesthetic Delivery (C-CLAD)
8. Researchers Create Long-Acting Local Anesthetic
9. Medical study shows epidurals and spinal anesthetics are safer than previously reported
10. MINRAD International, Inc. Announces Termination of RxElite Holdings Inc. as Anesthetics Distributor for the Human Market in United States
11. Common anesthetic induces Alzheimers-associated changes in mouse brains
Post Your Comments:
(Date:6/26/2016)... Michigan (PRWEB) , ... June 26, 2016 , ... ... to fertility once they have been diagnosed with endometriosis. These women need a ... they also require a comprehensive approach that can help for preservation of fertility ...
(Date:6/25/2016)... ... ... closing of Bruton Memorial Library on June 21 due to a possible lice infestation, as ... of head lice: the parasite’s ability to live away from a human host, and to ... one in the event that lice have simply gotten out of control. , As lice ...
(Date:6/25/2016)... CA (PRWEB) , ... June 25, 2016 , ... As ... with Magna Cum Laude and his M.D from the David Geffen School of Medicine ... and returned to Los Angeles to complete his fellowship in hematology/oncology at the UCLA-Olive ...
(Date:6/25/2016)... ... June 25, 2016 , ... Conventional wisdom preaches the benefits of moderation, ... the latter, setting the bar too high can result in disappointment, perhaps even self-loathing. ... toward their goal. , Research from reveals that behind the ...
(Date:6/24/2016)... ... June 24, 2016 , ... June 19, 2016 is World Sickle ... chronic pain and the benefits of holistic treatments, Serenity Recovery Center of ... Sickle Cell Disease. , Sickle Cell Disease (SCD) is a disorder of the red ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... , June 24, 2016  Arkis BioSciences, a ... invasive and more durable cerebrospinal fluid treatments, today ... The Series-A funding is led by Innova Memphis, ... and other private investors.  Arkis, new financing will ... and the market release of its in-licensed Endexo® ...
(Date:6/23/2016)... a startling report released today, National Safety Council research ... proven plan to eliminate prescription opioid overdoses. Prescription Nation ... tackling the worst drug crisis in recorded U.S. history, assigned a ... , New Mexico , Tennessee ... failing states, three – Michigan , ...
(Date:6/23/2016)... 23, 2016 Bracket , a leading clinical ... generation clinical outcomes platform, Bracket eCOA (SM) 6.0, at ... 26 – 30, 2016 in Philadelphia , ... Outcome Assessment product of its kind to fully integrate with ... Bracket eCOA 6.0 is a flexible platform for electronic clinical ...
Breaking Medicine Technology: