The Latest on Lice

by Perri Klass  (anything written by Perri Klass is worth reading)

NY Times, October 10, 2017

Full Text.

We spend a billion dollars a year on treatments for head lice, according to the American Academy of Pediatrics.

Head lice is spread from person to person.  It is an infestation, not an infection — they do not actually carry infections.  The AAP argues first and foremost that children should not miss school because of head lice or nits.  It’s not necessary to treat all the children in a classroom, or all the people who live in the house, though anyone who shares a bed should get treated.

It can be helpful to treat more than once, usually after about nine days, if you are using a product that does not kill the eggs, or if you see live lice after a first treatment.

There should never be a case for a child with head lice spending days out of school. Families should be notified, they should be able to access topical medication and they should be able to re-enter the next day.”

Perri Klass is a respected pediatric writer.  This is a level-headed. helpful review.

An effective nonchemical treatment for head lice: a lot of hot air.

Goates BM, et. al. Pediatrics. 2006 Nov;118(5):1962-70.

“RESULTS:  The most successful method, which used a custom-built machine called the LouseBuster, resulted in nearly 100% mortality of eggs and 80% mortality of hatched lice. The LouseBuster was effective in killing lice and their eggs when operated at a comfortable temperature, slightly cooler than a standard blow-dryer. Virtually all subjects were cured of head lice when examined 1 week after treatment with the LouseBuster. There were no adverse effects of treatment.

[Strangely, I think the authors of this article had a conflict of interest.The LouseBuster was made in Salt Lake City and Groates does his research there, too.While hot air is an attractive remedy, it may no be practical. DJE]

A Study on the Nocebo Effect

Nocebo Effects Explored

Brief You Tube Introduction

Title and Abstract:
Interactions between brain and spinal cord mediate value effects in nocebo hyperalgesia.  Tinnermann A. et. al.

Abstract: Value information about a drug, such as the price tag, can strongly affect its therapeutic effect. We discovered that value information influences adverse treatment outcomes in humans even in the absence of an active substance. Labeling an inert treatment as expensive medication led to stronger nocebo hyperalgesia than labeling it as cheap medication. This effect was mediated by neural interactions between cortex, brainstem, and spinal cord. In particular, activity in the prefrontal cortex mediated the effect of value on nocebo hyperalgesia. Value furthermore modulated coupling between prefrontal areas, brainstem, and spinal cord, which might represent a flexible mechanism through which higher-cognitive representations, such as value, can modulate early pain processing.

NY Times Expostulation: 10/10/2017

When people believe a medicine is expensive, they may show a greater response to it.

Researchers told 49 volunteers that they were testing two anti-itch creams — one that was costly, and one cheap — that contained the same ingredient known to reduce itch, but that the ingredient sometimes increased sensitivity to heat.

Then they showed them the two medicines, one in an expensive-looking brand-name box with fancy lettering, the other in a plain generic-looking container. They did not tell them that neither cream contained any medicine, and that both contained only the same inert ingredient.

They randomly assigned them to try either the expensive or cheap cream. All participants knew which cream they were using. The study is in Science.

When exposed to heat, the volunteers using the expensive cream felt consistently more pain than those using the cheap one, and the effect increased over time. Using fMRI brain scans, researchers were able to show exactly which parts of the brain were involved in modifying how price information affects pain.

“These expectations that patients have matter,” said the lead author, Alexandra Tinnermann, a doctoral candidate at the University Medical Center in Hamburg, Germany. “This is something doctors should be aware of and make use of to create positive expectations and reduce negative ones.”