Pain is not a welcome sensation but it has its place in serving as an early warning system. This is the first chapter in a book on knee osteoarthritis "Knee Deep in Pain" and discusses how pain is triggered and how we feel it.
Zafar Hayat Khan http://www.NouvelleSante.com
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he gods were running out of amusing things to indulge
themselves with. Poseidon was getting tired of slapping
mermaid tails and Zeus had run out of targets after
destroying much of the forest with his bolts of lightning fired
from the top of Mt. Olympus. Feeling a bit mean spirited the
brothers plotted to have some serious fun.
They decided to hold a special give away. They announced they
would hand out gifts, offering four; Beauty, Brains, Drama and
the fourth was a mystery item labeled âPâ. The only rule was,
while anyone could pick one of the four and walk away with it, if
someone went on to take two they must accept the mystery gift
as well.
Narcissus happened to glance up from the edge of the still pond
where he was sitting admiring his looks, and mumbled:
âI am already beautiful, who needs brains; they are boring, I
have no interest in mystery, butâŠ
Summary
hhhmm⊠I could surely use some
Pain is not welcome but it
dramaâŠâ.
serves a purpose. This
He took that one.
chapter outlines a brief
history and general
Big surprise there!
discussion of pain.
Aphrodite came along and knowing that brains were so
overrated snapped up Beauty, and quickly departed fully aware
of the trouble the brothers were capable of.
Athena was passing by and decided she was definitely
interested. She selected Beauty and of course without wasting a
breath also immediately picked up Brains.
Bamm! Zeus roared:
âAthena, you and your sisters will forever live with Painâ.
Unwittingly she had been awarded the mystery gift âPâ. Athena
complained loudly but no one heard.
She tried to console herself by assuming the two gods were
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talking about sharing life with a man, which can bring
unbounded misery all on its own. Finished with their
particularly mean prank, one brother went back to chasing
mermaids, while the other flew back up to the throne on the
mountain amidst smoldering remains of previously zapped tree
tops. Both brothers completely oblivious of the damage their
prank was about to do.
Narcissus was too busy with âMmwahh⊠Mmwahhâ kissing
his own reflection in the pond. It is said he stars in several soaps
on daytime American TV. Judging by how long some of the
soaps have been airing, there might be some truth to that rumor.
One thing is certain. Womenâs pain is real. Even though it
has taken society a very long time to acknowledge it, primarily
because women were expected to suffer in silence, and they did.
Historically what carried more weight was pain in a âmanâ.
Something else has changed. We will see that later toward the
end of the chapter in a conversation about some special
receptors.
Claudius Galen (129-199 A.D.) would know pain when he
saw it. He was the Roman physician officially appointed to
taking care of gladiators.1 Given the cuts, bruises, bludgeoning,
hammering, stabbing and piercing these combatants endured in
the arena there would be no dearth of material for Galenâs study
on treating pain. A picture of a real life gladiator can be painted
from findings of two pathologists at the Medical University of
Vienna 2 working on an archaeological dig in Turkey.
They examined 67 bodies with painstaking detail in what
appeared to be a cemetery where gladiators were buried. Marks
and scars on the bones of skeletons indicate healed wounds on
these professional fighters who were expensive to maintain for
their nourishment, training, and medical treatment. Most of
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nursing staff view them as whiners who have a low tolerance for
pain.4 Such lack of awareness of cultural differences can create
peculiar situations in the delivery of healthcare.
In 1993 authors of the same study looked at two populations
of women patients, one Anglo American and the other Mexican
American, and asked them to use the McGill Pain Questionnaire
to evaluate pain they were experiencing after a cholecystectomy.
Multivariate analysis of variance (MANOVA) was employed to
see if there were any significant differences in the two groups on
any measures of pain. There werenât any. Nursing staff were then
asked to rate pain experienced by patients based on the two
groups of womenâs responses. As it turned out nurses assigned
more pain to Anglo Americans and judged the Mexican
American womenâs pain to be less.5
In the paper âCulture and Painâ, 6 Gary Rollman quotes an
article from the 1985 issue of Clinical Journal of Pain
â..Scandinavians are tough and stoic with a high tolerance to
pain; the British are more sensitive but, in view of their
ingrained âstiff, upper lipâ do not complain when in pain; Italians
and other Mediterranean people are emotional and overreact to
pain; and Jews both overreact to pain and are preoccupied with
pain and suffering as well as physical health.â 7 Quoting another
study Rollman writes about how some Christians, in an attempt
to identify with Christâs own pain and suffering, embrace pain
either when it is accompanied by disease or inducing it by âselfchastisementâ as in stigmata.8
According to the Institute of Medicine, well over a 100
million American adultsâmore than the total affected by heart
disease, cancer, and diabetes combined, suffer from chronic pain
at a cost of up to $635 billion each year in medical treatment and
loss of productivity.9 In his testimony, Dr. Philip A Pizzo, Dean
of the Stanford University School of Medicine as well as
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Professor of Pediatrics and of Immunology and Microbiology,
called the magnitude of pain in the United States âastoundingâ,
with more than 116 million Americans suffering from pain that
persists for weeks to years. This data does not include children,
individuals in nursing homes or chronic care facilities, prisons or
the military, making the impact even more significant. Authors
of the study, released in 2011, argue for ârelieving painâ to be
given a national priority given the toll it takes on human lives
and social consequences, not to mention the hard dollar costs.
Figure-3 "Kaibo Zonshinzu Anatomy Scrolls (1819)
11
There is also a gender element in sensitivity to pain. 10
Women are more frequent sufferers, but seek help more readily,
and as a result recover more quickly from pain. They are also less
likely to allow pain to control their lives. Unfortunately, biology
and skeletal differences make women more prone to pain, and
they also feel it more acutely than men. A constant and
unavoidable irritant in womenâs anatomy is the Q-Angle,
covered in the chapter Care to have a joint? Other causes of pain
may be explained by hormonal differences. When researchers
injected male mice with estrogen, a female hormone, the result
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was a lower tolerance for pain. However, female mice when
injected with testosterone, a male hormone, resulted in the
female mice exhibiting a higher threshold for pain.
So, what is pain?
Galen of Pergamom, the gladiator physician, who was a
famous anatomist and also served as personal physician to the
Roman emperor Marcus Aerilius, distinguished three types of
nerve: "soft" nerves, "hard" nerves, and pain nerves, and believed
the brain was central to sensing pain. His contributions to
medicine are memorialized with naming of the âvena Galeniâ or
âvein of Galenâ; one of the larger vessels responsible for draining
the anterior and central regions of the brain.12
Up until Galen most of existing medical knowledge and
philosophy did not connect pain to the brain and dominant
thinking continued to identify pain as an emotional state. Plato
(c. 427 BC â c. 347 BC), the prominent classical Greek
philosopher, and founder of the Academy in Athens, thought
that the heart and liver were where the sensation of pain was felt
and it arose not only from peripheral sensation but could also be
an emotional response in the soul in the heart. 13 Platoâs student,
Aristotle, did not believe the brain had much to do with the
sensation of pain either. He was of the opinion that pain was the
result of evil spirits entering the body through injuries.
Hippocrates, known as the father of medicine, was of the
view that pain resulted from imbalances in the vital fluids. 14 IbnSina of Persia [980-1037], a great Muslim physician known in the
western world as Avicenna, wrote extensively about the brain as
a center for pain sensation. He expanded Galenâs four pain
classification types to fifteen.15 Many of the terms used by IbnSina in his classification are strikingly similar to those used in
the 1975 McGill Pain Questionnaire16 developed by Ronald
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Under normal conditions substantia gelatinosa also receives
messages from the brain. Further, according to the theory,
messages from the brain may ââŠmake it possible for central
nervous system (brain) activities subserving attention, emotion,
and memories of prior experience to exert control over the
sensory input.â After the first sensations of pain are registered at
the brain, it is possible to modulate the severity by sending
impulses to the gate in order to close it (Figure-4, right panel).
Thus messages from the brain could serve to offset or limit
the severity of pain at the spinal cord before pain sensation is
transmitted to the brain. Not only the brain, but sensory inputs
like rubbing or scratching the vicinity of the pain source can
help close the âgateâ to prevent Neurons are self sufficient
or attenuate pain messages
nerve cells that conduct
from reaching the brain. What electrical impulses back and
forth in the body. A vast
makes this theory particularly majority of them are found in
the brain. They die with age
interesting is that it is based
on the differences in the types and disease.
of nerve fibers. Ones that carry âpainâ impulses are being blocked
by those that carry âtouchâ sensations. Scientists know about this
difference in nerve structure and function.
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When you accidentally touch
the hot surface of a toaster in
trying to get your bread out in
a hurry, it is the âAâ fiber over
which this information travels
to the spinal cord from where
a motor neuron shoots a
stimulus to the muscles in
your arm and hand to
withdraw instantly.
If it were not for the âAâ fiber
your fingers would be toast.
Dorsal Horn
The dorsal horn is found
towards the back of the
spine through all levels of
the spinal cord; cervical,
thoracic, lumbar, and sacral.
This area receives
information from the rest of
the body in âsubstantia
gelatinosaâ cells at the cap of
the horn. These sensations
include touch, vibration,
temperature and pain. These
sensory messages are then
relayed to the brain.
Please see Appendix for
more information on
substantia gelatinosa.
Just so they are not left
behind from the âpain inflicting partyâ, prostaglandins,
membrane associated lipids that activate whenever, and
wherever there is a problem, can cause pain by direct action
upon nerve endings. Even at low concentrations, they markedly
lower the pain threshold thereby increasing sensitivity. Lowering
of the threshold can cause even normally painless stimuli to
become exaggerated. When produced within the central nervous
system, they sensitize perception to painful substances. Pain is
thus induced both at the site and at the central nervous system,
where signals are processed.23 Prostaglandins are covered in
more detail in the chapter 10: Veni, Vidi, Vici.
When the Huns invaded China, the dreaded Shan Yu of
Hollywood, and leader of the ruthless warriors, claimed he will
kick a certain rulerâs behind before long. Little did he know that
it would be somewhat difficult since that certain part of the
emperorâs anatomy was a bit preoccupied. Being that he was
sitting on pins and needles, not worrying himself sick, but in fact
relaxing his mind to think clearly and to devise new strategies,
such as bringing Fa Mulan from Disney on board to fight the
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invaders.
Not surprisingly the people who built the Great Wall also
knew a thing or two about gates. The pain relief practice that has
been used, and has thrived, in China for over 2,500 years, some
say 8,000 years, is acupuncture. It remains an an unfathomable
mystery, how, several thousand
A name for Gate Control
years ago, without advanced
Theory does not exist in
diagnostic and analytical
Chinese, but if it did it would
be called âchowmen kumchi
Equipment and billion dollar labs,
luwenâ
some geniuses in China figured out
ééæ§ć¶çè«.24
a connection between nerves, pain
The Chinese name for
acupuncture happens to be and relief.
éćș (pronounced chen su,
written zhen jiu). It
translates as âneedle thornâ
on Google.
Pain Receptors
are found at the receiving
end of the neuronâs pathway
for communications at the
tips of dendrites; tentacle
like nerves. They are found
throughout all tissues of the
body, including skin,
muscles, joints, and organs.
The proposed mechanism used by
the gate control theory, validates
âzhen jiuâ in a fascinating manner. 25
Inserting needles in the skin in
selected areas and then twirling
them stimulates the two sets of
nerves, containing âAâ and âCâ fibers.
Some of the initial pain sensation
gets through to the brain through
the spinal cord possibly because the âAâ fiber nerves have not
been poked yet. Once they get stimulated they start reaching the
spinal cord much faster and with higher frequency than the pain
carrying impulses, in effect closing the gate. At this stage pain
messages are unable to get through to the brain, in a sense,
bumping up against the closed door. This is like a âwhoâs your
daddy nowâ moment for the touch sensing âAâ fiber nerves
standing at the gate looking down at the pain sensing âCâ fibers.
The gate control theory does not explain how, pain remains
absent for several hours after acupuncture. And for itself,
acupuncture has not done well in studies 26 showing some
benefits of statistical significance but not enough for clinical
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relevance and pain reduction âindependently of the
psychological impact of the treatment ritual is unclear.â 27
A 2005 study in JAMA concluded, âAcupuncture Treatment
No More Effective Than Sham Treatment In Reducing
Migraineâ.28 Even if acupuncture was as effective as supporters
say, it still remains one of the pain remedies and another
weapon against the âmessengerâ. But we are still far from a cure.
Here we will return to the gender-pain connection and see if
men and women respond differently to medications. Well, at
least one remedy appears to be more effective for women than
for men. It has been discovered that pain killers that bind to
kappa-opioids receptors work better in women than men.
Researchers are not sure if it is a woman's estrogen that makes
them more effective, or is it a man's testosterone which
obstructs the mechanism for âkappa-opioidsâ pain relief in men.
But any discussion really becomes strictly academic as the
person feeling the pain is less concerned about its definition and
more about how to seek relief. There is probably no mortal out
there who has gone through life without experiencing pain. In
fact, in the U.S., chronic pain is responsible for more disabilities
than heart disease, stroke, cancer, and AIDS combined. 29
Regardless of where pain originates, prevailing scientific
thought tells us the sensation is communicated to the spinal
cord, from where it is transmitted to the brain to be registered in
memory.30 From there, as a response, signals are sent to facial
muscles where a visible reaction is conveyed and to other
muscles that may help in taking corrective action where the
original stimulus that triggered the pain occurred. At the same
time messages may be sent to muscles that control the vocal
chords to complain about the pain. It would be safe to assume
unless our brain tells us we have pain we will never know about
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it.
Above all, pain is a crucial feedback mechanism. Without
registering pain we would not be able to stop and remedy
whatever we are doing that triggered the stimulus in the first
place, possibly causing irreparable harm to the body. Arguments
against the value of pain as a signaling and messaging
mechanism 31 will continue to place emphasis on finding new
and novel ways of âshooting the messengerâ while ignoring root
causes.
In this, modern medical treatment has diverged from
ancient practices. Where pain was, in many cases, supposed to
be a necessary part of sickness and salvation, the actual cause of
the affliction was given priority, and any cure, medical,
therapeutic, or magical focused on the problem and not the
pain. After all, Attila the Hun, in his lecture to prospective MBA
students, advocated shooting the person who did ânotâ deliver
bad news.32 But it may have been tyrants like Attila the Hun, the
real one, who can be credited for the priority shifting from
curing the disease to the treatment of pain.
Imagine being a personal physician for a ruler. Every time
you stepped out to purchase herbs and ingredients to treat some
royal illness, people in the market place bowed out of respect
and gave you preferential treatment. After all you were
responsible for the kingâs continued health. You were clearly
distinguishable because of the tall pointy hat you always wore in
public.
When the chemist would try to advise you the ingredients
you are shopping for are not related to the malady you were
supposed to be treating, you would mutter under your breath
you donât know my life. They donât know how hard you get
whacked âupside your headâ when the king squirms in pain. And
the throbbing lumps make your head look like a potato with a
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personality which you donât want others to see.
Hence the tall pointy hat!
Now you need pain medication both for yourself and for
your liege.
For your own welfare and self preservation; âbetter to treat
the pain than the problemâ; and in your defense, we understand.
Finding an actual cure for many of the diseases is just not that
simple, if at all possible.
Taking care of pain is only one aspect of treatment. If the
root cause is not addressed, pain will return. The longer it takes
to treat the source, the higher the chances the person will
eventually become a chronic pain patient.
For citations please see pages 253 through 257 in Bibliography.
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Appendix
Spinal chord â gray matter Wikipedia User: Polarlys. CCA 2.5 Generic license.
Pain and other noxious information is transmitted through
myelinated delta-âAâ and unmyelinated âCâ afferents to the
substantia gelatinosa in the dorsal horn, mostly to lamina II. SG
neurons exhibit a variety of excitatory and inhibitory synaptic
responses that range in duration from milliseconds to minutes.
The sensory received at the SG is modified and integrated
regulating the outputs of projection neurons located in lamina I,
IVâV. 33