Dr. Shawn Kerfuffle Update

I notice that Dr. Messonier has deleted  my response to his blog post defaming me. I guess polite, reasoned criticism is intolerable to him.

He has also written another post full of strawmen and cliches. He begins by trying to make his readers believe science-based veterinarians live in a fantasy world where nothing is done that is not validated by rigorous clinical trial evidence: “According to the skeptics, unless the therapy has been proven to work through numerous rigidly controlled scientific studies, they would be considered “alternative and unproven therapies” that should not be used in the practice of medicine.” Of course this is nonsense, and attacking a position your opponent doesn’t hold is vacuous rhetorical trickery.

A good definition of evidence-based medicine, which I have often quoted, is “the integration of the best research evidence available with clinical expertise as well as the unique needs or wishes of each client in clinical practice.” Clearly, no one is arguing that we should never do anything unless it has been validated by good clinical trials. The point of evidence-based medicine is simply to organize the evidence in a hierarchy from least reliable (anecdote, personal impressions) to most reliable (replicated and well-designed clinical trials), and to weight most heavily the highest quality evidence available for a given intervention. Obviously, this is too complicated for Dr. Messonier, who prefers to paint an image of an imaginary bogeyman called the “The Skeptic,” which he then pastes over the face of anyone with the temerity to suggest his personal experiences might be mistaken.

He goes on to accuse conventional veterinarians of choosing to kill pets rather than admit their methods have failed and refer their patients to someone, like him, who has the power to help them. How’s this passage for self-aggrandizing, closed-minded, mean-spirited mischaracterization of those who disagree with him?

“I’m still bewildered by the fact that many conventional veterinarians choose euthanasia as a solution for failure of their conventional treatments, rather than simply opening their minds to the healing power that exists when using clinically proven, time-honored natural therapies. My hope is that more owners will continue to seek doctors, for themselves and their pets, who are open-minded to doing what is in the best interest of the patient regardless of which therapy ultimately proves successful, or which one has been “proven” to work by artificially designed controlled studies.”

Note the use of “clinically proven” to mean “I think it works.” And the use of “proven” in scare quotes to denigrate the conclusions of scientific evidence. Then there’s the usual meaningless cliché “time-honored natural” to describe blind faith in tradition combined with the naturalistic fallacy. And finally we have the blithe dismissal of clinical trials as “artificially designed controlled studies.”

This is a portrait of a mind closed to any suggestion of its own fallibility and blind to the history of medicine in the last 200 years, which has seen progress in well-being unlike the previous total of human history thanks to the “artificial” methods of science. This is a doctor so certain that he is right that disagreeing with him is intolerable and must be denounced, with all the self-righteousness of the religious fanatic, as a willful refusal to see the truth that he sees so clearly.

Of course, civil debate about the facts of specific medical interventions is impossible with such an attitude. He’s never once tried to convince me of anything, merely taken my suggestion that his epistemology is flawed as a personal affront and gone on a tirade against a cartoon image of me and other veterinarians who don’t placidly accept his view. The best one can hope for in such situations is that, as he suggests, pet owners will listen to the quite different approaches we represent and decide for themselves where the best hope for their pets lies. I have no doubt Dr. Messonier is genuinely convinced he is offering the best medicine, and I have very little doubt that he is mistaken. However, I agree with him at least so far as to believe pet owners can see through closed-minded nonsense. I just happen to believe that will lead them towards scientific, evidence-based medicine rather than “time-honored” woo.

Posted in General | 7 Comments

Dr. Shawn Messonier Disses the SkeptVet

Dr. Shawn Messonier, a highly visible alternative medicine veterinarian with a blog, radio program, and a couple of books, recently wrote an opinion piece for the online edition of USA Today claiming that changing vaccine recommendations were validation of his personal beliefs and clinical experiences about vaccines. Rather than recognizing that science is a process, not a fixed conclusion, and that such changes based on new evidence are exactly what good science and medicine are about, he prefers to interpret changes in vaccination practices as validation of his alternative medicine perspective, and he recommends we vaccinate even less (based, of course, on his clinical experience and intuition, not any specific evidence). I’ve investigated and written about veterinary vaccination in detail, and while there weren’t many specifics in his piece, I did feel he was too casual about implying that titer testing could be a wholesale replacement for vaccination and in citing his personal experiences as if they were a sound basis for a medical recommendation.

Rather than respond to my quite limited critique, Dr. Messonier chose to create and them attack a strawman with my name on it. He began by defending personal experience (though only of holistic doctors) as solid evidence and then referring vaguely to supposedly supportive studies:”I’m not surprised that “skeptvet” is skeptical of the recommendation for titer testing or other proven natural therapies. The “personal experience” of thousands of holistic doctors constitutes proof, as do controlled studies.”

He then raises some irrelevant uses of titers to test for infectious diseases and ends with the assertion that ” I’m all for scientific proof, but let’s not discount numerous cases of pets who improve with “natural” remedies simply because an admitted skeptic chooses not to “believe” in the facts.”

I responded trying to clarify his mischaracterization of my position and what my specific concerns were and left it at that. I then got an e-mail form Dr. Messonier asking me to appear on his radio program, chat a bit and take some calls from listeners. I got the impression that he was looking for a “sacrificial skeptic” rather than a substantive debate, so I declined. This concern has been confirmed by his recent blog post adding some features to his strawman version of me.

He starts by assuming my objections to CAM must be personal rather than principled and fact-based: “I’m not sure what his argument has to do with the fact that pets no longer need vaccines, but it’s obvious this anonymous person has some sort of grudge against alternative medicine and alternative doctors.” I’m not sure if he got carried away or really believes pets “no longer need vaccines,” but that is certainly a more radical position than he took in the USA Today article. As for having a “grudge” against alternative medicine providers, that is just an ad hominem to invalidate my points without actually addressing them.

He then tried to make hay out of suggesting there was something sinister in my not blogging under my real name: “I decided to check out skeptvet’s website. It was no surprise to find this person still does not identify himself on his website, which automatically raises a red flag for me. If you have a difference of opinion I respect that, but least don’t hide behind some anonymous moniker. In order to judge anyone’s credibility, it’s important we know who is making the statements. So from the outset skeptvet has one strike against him.”

What anonymity has to do with the substance of my positions I don’t know, but as I explained in my response to him, I blog under a nom de plume partly because the blog isn’t about me personally, it’s about the issues in veterinary medicine I am addressing. I don’t have any craving for the media spotlight, as he seems to. I also don’t wish to court unnecessarily the sort of pointless personal attacks he made in his post since adherents to alternative medicine seem to greatly resent criticism. If he is really interested in my identity, it would take about 5 seconds on Google to find it, so I don’t see that little bit of innuendo as meaningful.

He then went on to defend clinical experience as a form of evidence, with rather more passion than clarity of thought. Finally, he wrote me off as a closed-minded skeptic, thus dispensing with my arguments without so much as a glance in the direction of their substance or evidence:”Ultimately like many other skeptics, skeptvet will never be convinced that various therapies with which he does not agree may be helpful for people and pets. For those with an open mind, and the willingness to accept the time-honored tradition of clinical experience, a new world of healing awaits where true health can be obtained. An open mind is needed for change, and with change comes endless possibilities!”

Very convenient, and very consistent with the general world view that places personal faith above objective research in the hierarchy of evidence. Believe hard enough, click your heals together three times, and anything is possible! I’ve written about what real open-mindedness is before, but I doubt he took the time to read or consider that.

Though it was probably pointless, I responded on his blog, chiding him for personalizing his comments and attacking his imaginary image of me rather than dealing with what I actually say. Here’s part of what I said:

“I am quite open-minded to any therapy that is demonstrated to work in a reliable scientific way. I submit I am more open-minded than you are since I acknowledge that my personal intuition and experiences may be mistaken, while you stick by your own beliefs regardless of what the research evidence says. Pick something specific I have said doesn’t work, show me real evidence it works, and I will be happy to admit my error for all the world to see… If I am opposed to alternative medicine it is only because I am opposed to gambling and experimenting on our patients. The problem is not with my closed-mindedness or prejudice, it is with your standards of what constitutes reliable proof… Clinical experience is evidence, yes, but it is weak evidence and progress in medicine will not come from adhering blindly to tradition or simply trusting your gut, it will come from vigorously investigating new ideas to see if they are worthy of applying to our patients.”

This exchange is paradigmatic for the conflict between science-based medicine and faith-based medicine. Challenging a belief based on intuition, experience, faith in folk tradition, and so on automatically creates personal animosity and resentment. Since the basis for the belief is personal, any challenge to it must be taken personally as well. If my clinical practices are challenged and the evidence shows I am wrong, I may be embarrassed, but I will be grateful for the guidance, not resentful of it because the truth is more important than my feelings or my ego.

Sure, clinical experience and intuition form part of the basis for my beliefs just like anybody else. I am human, and I share in all the genius and all the stupidity of human nature. However, I accept that science is a set of tools that compensates for human cognitive flaws, and when the choice is between good science and intuition, I’d bloody well better abandon my intuition or I am valuing my ego above the truth and following in the venerable tradition that brought us therapeutic bloodletting, faith healing, homeopathy, and all manner of ineffectual or dangerous nonsense.

I’m happy to cordially discuss and disagree with Dr. Messonier about veterinary medical practices, and I’m open to the possibility that he knows things I don’t know and that he might be able to show me things I’m wrong about. But he seems more interested in demolishing strawmen, so it’s unlikely I’ll get the chance to learn anything he might have to teach me, and it’s certainly unlikely he’ll be able to learn anything from me.

Posted in General | 6 Comments

Attitude Towards CAM Among Medical Students?

For all that CAM proponents like to claim their methods are philosophically different from (and of course superior to) mainstream medicine, they also can never resist claiming scientific legitimacy or popularity among mainstream health care professionals. “Integrative medicine” is the buzzword for the effort to encourage doctors to mix unproven or outright disproven therapies in with real medicine and then give the woo the credit for any improvement and “allopathic” medicine the blame for any adverse effects.

A recent survey of medical students illustrates the agenda of integrative medicine nicely. One author, a CAM researcher at UCLA named Ryan Abbott, claims: “Complementary and alternative medicine is receiving increased attention in light of the global health crisis…Integrating CAM into mainstream health care is now a global phenomenon, with policy makers at the highest levels endorsing the importance of a historically marginalized form of health care.” These are big claims, and while there certainly has been encroachment of CAM into academic medicine and powerful figures in government are pushing the CAM agenda, I am not convinced that there is a wave of support for legitimizing unproven or nonsense therapies among practitioners, students, and teachers of scientific medicine.

This study claims to show high levels of support among medical students for integrating CAM methods into mainstream medical training and practice. As always with surveys, how the questions are asked says a lot about the reliability of the answers, but the full article is not yet available at the eCAM Journal site, so I can’t evaluate that. The authors do indicate, however, that the response rate to their survey was only 3%, which is extremely low. Response rates necessary to view a random population sample as representative are closer to 70%, so any generalization based on this data would be unjustified. Likely the only students who bothered to respond were those already predisposed to favor CAM, or perhaps those sufficiently motivated against it to take the survey, so it is doubtless a skewed sample. The response rate itself certainly does not suggest the level of interest in CAM that the authors seem to be trying to use the reslts to argue exists among medical students.

The authors also repeat the tired and inaccurate cliches about CAM being more “holistic” and “individualized” that scientific medicine. All-in-all, this “research” looks simply like an attempt to create the perception that the mainstream medicine is beginning to “see the light” and that doctors will soon be more open to spending more time and effort on placebo therapies. One can only hope the perception doesn’t become the reality.

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The Ethics of Honesty in Veterinarian/Client Relationships

There was a thoughtful and cogent essay on the Kevinmd Blog today about a key element in doctor/patient (or in the veterinary case doctor/client) relationships: what happens to the relationship when you say “No” to people. This is certainly a common challenge for veterinarians, and it set me to thinking about situations in which we are required, in my opinion, by ethics to tell our clients things they don’t want to hear, and things that will not endear us to them.

In America there are be two well-known rules:

1. Nothing is ever nobody’s fault.

2. There is never nothing to be done.
(I apologize for the grammar, but I feel the emphasis is more appropriate than the better-written versions of these statements)

As an advocate for science-based medicine, because I truly believe it leads to better health and well-being for patients than opinion and faith-based medicine, I have an ethical responsibility to own up to the limitations of scientific knowledge. I cannot claim one unifying cause for all disease (toxins, subluxations, unbalanced ch’i, dietary deficiencies, and on and on). And I cannot claim to always know why a particular clinical problem affects a particular pet. Philosophically and personally, I am comfortable with some degree of scientific indeterminism, and I believe it is possible that some things simply can never be predicted or fully understood. But even in the more pragmatic, practical world of applied medical science, the reality is that there is much we don’t know, and pretending that we have all the answers is misleading and wrong.

Unfortunately, people don’t like uncertainty, especially when it involved illness, and they tend to view the claim that something bad happened for reasons we don’t understand, or even possible just by chance and so for no good reason at all, as unacceptable and likely a cover for incompetence. Not being able to identify a clear and simple cause for something means we cannot control or prevent it, and this makes us afraid, and fear makes us angry. Facing this anger and dealing with it compassionately, and yet honestly, is a tough part of our job as veterinarians.

It is very difficult to tell a client that we do not know why their pet has a particular medical problem, and even more difficult to then deny them the comfort of the unproven, or even outright bogus theories they come up with or that others offer them. But part of our ethical responsibility to our clients, and the way we earn the trust they must ultimately have for us to do our jobs, is that we must be honest, even when dishonesty might provide some comfort or make us look better.

Along with admitting to the limitations of our knowledge, I believe we must be honest about the knowledge we do have. When we know that 98% of cats under 10 years of age who present with bloody urine do not have urinary tract infections, we must deny the client the antibiotics they may want from us even if we could make the client happy and get the credit for the pet’s subsequent improvement. We know they won’t help, and may even hurt the patient, and we have a responsibility to admit and make appropriate use of that knowledge. Giving antibiotics for infections that are likely viral and vitamins and other supplements that have no demonstrated value are common practice among physicians, and likely veterinarians as well. They serve our need to do something, and the clients’ need to get something for the trouble and expense of coming to see us. However, they are illusions, not medicine, and ultimately I don’t believe they benefit our patients, clients, or profession.

The same holds true for any implausible or outright unproven medical approach. While our clients are likely to perceive improvement, at least in the short term, with almost anything we do (thanks to a placebo effect by proxy), giving a placebo is a form of lying and is essentially unethical and contrary to the principles of a legitimate veterinarian/client relationship. This is especially true for vets as the placebo is more likely to benefit our clients than our patients, who are better served by real therapies.

CAM therapies can have an advantage over science-based medicine in that they frequently offer direct and simple (though false) explanations and treatment protocols. CAM providers seem rarely at a loss for an explanation or a treatment, and though I am sure it must sometimes happen, it seems very rare that a CAM provider will admit that they don’t know why something bad has happened and that they do not have anything but comfort and support to offer. Part of the mythology that CAM  treats causes rather than symptoms, and part of the reality that CAM often makes clients more satisfied with their care than mainstream medicine, has to do with the sense of confidence and certainty (however unjustified) that allows CAM providers to avoid admitting helplessness or uncertainty when we who are dedicated to dealing in evidence and truth cannot avoid it.

There are many other examples of situations in which we are obliged by ethics to say no to clients or tell them something they don’t want to hear. Denying requests for tests, medications, or procedures that are not appropriate for the patient, recommending tests and procedures which are appropriate even if we fear the client may object to the costs, honestly (though gently) explaining their own responsibility for some medical problems and the actions they need to take (overfeeding and obesity, poor medication compliance, etc), and admitting our mistakes are all painful but necessary elements to a veterinarian/client relationship.

It is understandable that we may be tempted to shirk such painful communication, and it is certainly easier in the short run to do so. I have even met veterinarians who based long, financially successful careers on the routine practice of giving clients want they want regardless of what is medically appropriate or best for the pet, and of routinely lying to clients. However, I believe the ethics of our profession, the dictum to do no harm if we are not certain the need or benefit justifies it, and the principle of trust based on honesty in our relationships with clients often requires us to say “No” and to tell clients things they would rather not hear from us In the long run, I also believe we provide better care for our patients if we act this way, and that the short term advantages of false hope and even outright dishonesty cannot compete with the benefits of sticking with the truth, even if it may not always be what we wish it were.

Posted in General | 12 Comments

129th Skeptics’ Circle

Just to let all readers know, on January 28th, I will be hosting the 129th Skeptics’ Circle, a biweekly blog carnival collecting and presenting articles applying the skeptical point of view to a wide variety of issues. I’ve had a few of my own articles included in past Circles, and I’m very excited to have a chance to host!

Check out the recent 127th Circle, and remeber to check back for some ggreat skeptic writing January 28th! Or even better, contribute a blog post of your own!

Posted in General | 2 Comments

Cell Phones Are Good for You!

The question of whether the electromagnetic radiation from cell phones is a risk factor for human disease, especially brain cancer, has been debated and studied at length. There are committed partisans on both sides, but the research is inconsistent and incomplete. A couple of nice summaries and discussion of the issue and the research can be found at the National Cancer Institute and The Skeptics Dictionary. Overall, it seems unlikely to me that cell phone usage represents a significant risk, but the issue has not been decided beyond all reasonable doubt.

However, a recent study has added a bit of fun to the discussion by claiming cell phone radiation may prevent or reverse Alzheimer’s disease! According to news articles about the study:

“The results showed that:

Exposure started when they were young adults, ie before showing signs of memory impairment, appeared to protect the Alzheimer’s mice from becoming cognitively impaired.

Exposed older Alzheimer’s mice performed as well on tests measuring memory and thinking skills as normal older mice without dementia.

When older, previously unexposed Alzheimer’s mice already showing memory problems were exposed to the electromagnetic field, their memory impairment vanished.

Normal mice exposed to the electromagnetic waves for several months showed above normal memory performance.”

The authors seem quite optimistic about the applicability of the results to human disease:

“Since we selected electromagnetic parameters that were identical to human cell phone use and tested mice in a task closely analogous to a human memory test, we believe our findings could have considerable relevance to humans.”

“Arendash and colleagues concluded that electromagnetic field exposure could be an effective, drug-free, non-invasive way to prevent and treat Alzheimer’s disease in humans.”

“The cognitive benefits of long-term electromagnetic exposure are real, because we saw them in both protection- and treatment-based experiments involving Alzheimer’s mice, as well as in normal mice.”

It should come as no surprise that I don’t share this enthusiasm. The results are certainly interesting, but this is precisely the sort of small, animal model study that the media loves to extrapolate wildly from, contributing to the public perception that science is constantly finding phony “miracle cures” and that scientific research results cannot be trusted. The problem, as I’ve argued before, is not with science but with individuals, scientists and others, who treat such curious and preliminary results with excessive enthusiasm.

Talking about a “effective, drug-free, non-invasive way to prevent and treat Alzheimer’s disease” based on exposing mice to EM in the lab and then looking at their behavior and their brains is indefensible. Replication in other laboratories, further elucidation of possible mechanisms, study of safety concerns, and the whole labyrinth of procedures in human subjects to assess safety and efficacy are needed, years of work, before such speculations ought to be publically entertained. I’ve often pointed out that being part of mainstream science and medicine does not, alas, immunize one against some of the lapses in critical thinking often associated with CAM, and this provides another example.

Still, it will be interesting, though, to see what reaction this study generates in the alternative medicine community. I suspect those enamored of “natural” medicine will reject as unholy any such technological methods regardless of whether they ultimately prove useful. I also suspect that if the exact same study came out only “electromagnetic radiation” was replaced throughout with the name of an herb or traditional energy therapy, such a study would be nearly universally proclaimed as justification for immediate use of the agent or procedure in  human clinical practice. This is, after all, exactly the sort of evidence proponents of “Evidence-Based Alternative Medicine” routinely rely on.

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Nutrition in Large Breed Puppies

It is widely known by veterinarians, pet owners, and dog breeders that large breed puppies are at greater risk than other breeds for developmental disorders of the bones and joints, including hip dysplasia, elbow dysplasia, osteochondrosis dissecans (OCD), and hypertrophic osteodystrophy (HOD).[1,2] The breed predisposition for such disorders indicates a strong genetic component, however environmental factors can also influence the frequency of these disorders.[2,3] Nutrition during the growing period (birth until 10-12 months) is one of the most important factors influencing the development of these skeletal disorders. [2] Unfortunately, there are many myths about large breed puppy nutrition, so this article is an attempt to separate these from the real facts about developmental nutrition in large breed puppies.

Calories

By far the most important influence on the skeletal development of large breed puppies is total calories. Excess calories leads to more rapid growth and excess body weight, and these are associated with increased incidence of hip dysplasia, OCD, and elbow dysplasia.[4-8] Lower calorie diets do not reduce the ultimate stature a dog will achieve, but they reduce the rate of growth so that this size is achieved smoothly over the growth period rather than in a rapid burst.[9] This slower, more steady growth leads to fewer developmental orthopedic problems. he appropriate number of calories needed for optimal growth is different for every individual and depends on many factors. The best guideline for how much to feed is body condition. Several scoring systems are available (e.g. from Purina below), and puppies should be fed to an ideal condition (4/9 or 3/5).

Calcium

As with most nutrients, there is an optimal range of calcium levels for growing dogs. Both too much and not enough calcium can lead to developmental bone problems. For large breed dogs, this optimal range is narrower than for other breeds, and excessive levels of calcium cause OCD and other bone disorders earlier and with more severe consequences. While not all studies agree, the majority show a strong link between high calcium levels in the diet and bone problems, even when the levels of calories and other nutrients are the same. Though the level of calcium which increases the risk of skeletal problems varies with age, a calcium level of 210-540mg calcium per kilogram of body weight per day appears safe for large breed puppies of all ages. It is also important not to add vitamin and mineral supplements containing calcium to properly balanced puppy diets as this is very likely to increase calcium intake beyond safe levels. [2,5,10-12]

Protein

Many breeders and pet owners, as well as some veterinarians believe too much protein can contribute to developmental skeletal disorders in large breed puppies, but this is incorrect. An early study [5] observed orthopedic problems in dogs fed diets high in calories, protein, and calcium, but subsequent studies clarified that protein is not a risk factor for any of these problems.[13]

Diet Recommendations

The best way to meet the optimal dietary requirements for large breed puppies is with a commercial diet specifically designed for this purpose. Though many people recommend feeding an adult food, with the idea that it is lower in calories than regular puppy food, adult diets vary widely in calorie content, so this is not automatically true. Additionally, adult diets are not usually appropriately restricted in calcium content. It is also important not to add vitamin and mineral supplements containing calcium to properly balanced puppy diets as this is very likely to increase calcium intake beyond safe levels.

If you choose to feed a homemade diet or to supplement a commercial diet with table food or other additional ingredients, it is important to consult a nutritionist to ensure that the resulting diet has appropriate levels of calories and calcium to reduce the risk f developmental orthopedic disease.

References

1. Lauten SD. Nutritional risks to large-breed dogs: from weaning to the geriatric years. Vet Clin North Am Small Anim Pract. 2006 Nov;36(6):1345-59.

2. Hazewinkel H, Mott J. Main nutritional imbalances in osteoarticular diseases. In: Pibot P, Biourge V, Elliott D, editors. Encyclopedia of canine clinical nutrition. Aniwa SAS; 2006. p. 348-83.

3. LaFond E, Breur GJ, Austin CC. Breed susceptibility for developmental orthopedic diseases in dogs. J Am Anim Hosp Assoc. 2002 Sep-Oct;38(5):467-77.

4. Kealy RD, Lawler DF, Ballam JM, et al. Five-year longitudinal study on limited food consumption and development of osteoarthritis in coxofemoral joints of dogs. JAVMA. 1997;210:222-25.

5. Hedhamer A, Wu F, Krook L, et al. Overnutrition and skeletal disease: an experimental study in growing Great Dane dogs. Cornell Vet. 1974;64(1; Suppl 5):59.

6. Kastrom H. Nutrition, weight gain, and development of hip dysplasia. Acta Radiol. 1975;344(suppl):135.

7. Lavelle RB. The effect of overfeeding of a balanced complete commercial diet to a young group of Great Danes. In: Burger IH, Rivers JPW, editors. Nutrition of the dog and cat. Cambridge (MA), USA. Cambridge University Press; 1989. p. 303-15.

8. Grondalen J, Hedhammer A. Nutrition of the rapidly growing dog with special reference to skeletal disease. In: Anderson RS, editor. Nutrition and behavior in dogs and cats. Oxford, UK. 1982. 81-8.

9. Dammrich K. Relationship between nutrition and bone growth in large and giant dogs. J Nutr. 1991 Nov;121(11 Suppl):S114-21.

10. Hazelwinkel HAW, Goedegeburre SA, Poulos PW, et a;. Influence of chronic calcium excess on the skeletal development of growing Great Danes. J Amer Anim Hosp Assoc. 1985;21:337-91.

11. Schoenmakers I, Hazelwinkel HAW, Voorhout G, et al. Effects of diets with different calcium and phosphorus contents on the skeletal development and blood chemistry of growing Great Danes. Vet Rec. 2000;147:652-60.

12. Weber M, Martin L, Dumon H, et al. Growth and skeletal development in two large breeds fed 2 calciu levels. J Vet Int Med. 2000;388.

13. Nap RC, Hazelwinkel HAW, Voorhout G, et al. Growth and skeletal development in Great Dane pups fed different levels of protein intake. J Nutr. 1991;121:S107-113.

Too Thin

1  Ribs, lumbar vertebrae, pelvic bones and all bony prominences evident from a distance. No discernible body fat. Obvious loss of muscle mass.

2  Ribs, lumbar vertebrae and pelvic bones easily visible. No palpable fat. Some evidence of other bony prominence. Minimal loss of muscle mass.

3  Ribs easily palpated and may be visible with no palpable fat. Tops of lumbar vertebrae visible. Pelvic bones becoming prominent. Obvious waist.

Ideal

4  Ribs easily palpable, with minimal fat covering. Waist easily noted, viewed from above. Abdominal tuck evident.

5  Ribs palpable without excess fat covering. Waist observed behind ribs when viewed from above. Abdomen tucked up when viewed.

Too Heavy

6  Ribs palpable with slight excess fat covering. Waist is discernible viewed from above but is not prominent. Abdominal tuck apparent. 

7  Ribs palpable with difficulty; heavy fat cover. Noticeable fat deposits over lumbar area and base of tail. Waist absent or barely visible. Abdominal tuck may be present.

8  Ribs not palpable under very heavy fat cover, or palpable only with significant pressure. Heavy fat deposits over lumbar area and base of tail. Waist absent. No abdominal tuck. Obvious abdominal distension may be present.

9  Massive fat deposits over thorax, spine and base of tail. Waist and abdominal tuck absent. Fat deposits on neck and limbs. Obvious abdominal distention.

Posted in Nutrition | 13 Comments

Big CAM and Getting Bigger

I’ve pointed out before that despite the David and Goliath myth CAM proponents often market, that CAM is big business. A study in July, 2009 from the National Center for Complementary and Alternative Medicine (NCCAM)  reaffirms this. With all the usual caveats about the reliability of such surveys, the results found that adults in the United States spent $33.9 billion out of pocket on “alternative” medicine, exclusive of any insurance coverage or reimbursement for such treatment. Now, the NCCAM has some loose definitions of CAM, and it includes massage, yoga, and some other practices and products which may be considered CAM if they are provided or used with the intent to treat or prevent disease, but which may also be used for perfectly legitimate, non-medical reasons. Still, the numbers suggest there is a good deal of money to be made selling products and services that do not have a sound scientific basis, and this represents a real threat to the well-being of Americans.

The $33.9 billion represents about 11% of out-of-pocket health care expenditures, and the lion’s share of this (43.7% or $15.4 billion) went to non-vitamin/non-mineral herbs and supplements. That still left a respectable $3.9 billion for chiropractors and osteopaths and $2.9 billion for homeopathic remedies. Another, and scary way of looking at this, is that out-of-pocket expenditures on supplements and herbs was about 30% of that spent on prescription medications, and expenditures on CAM providers was about 25% of what was spent to see physicians. Granted, it is likely that the bulk of the overall $2.2 trillion spent on health care, which is insurance-reimbursed, is spent on scientific medical care, but it is still amazing that such large percentages of what people fork over out of their own pockets for health care goes to unproven “natural remedies” or thoroughly discredited nonsense like homeopathy. This confirms that people have a poor ability to judge the reliability of the health care information they receive and are easily taken advantage of, intentionally or not, by providers of unproven or bogus medical approaches.

So the next time a CAM proponent suggests that advocates of scientific medicine are Big Pharma shills trying to deny people safe and effective natural therapies because these are FREE, you might want to point them in the direction of this study.

Posted in General, Law, Regulation, and Politics | 2 Comments

Nutraceuticals & Cognitive Dysfunction–An Update

Back in September, I reviewed the evidence (or lack thereof) supporting claims of benefits from nutraceuticals in cognitive dysfunction. One of the more popular ingredients in many of the products sold with such claims is Ginkgo biloba, and at the time of my earlier review I concluded:

“The clinical trial evidence in humans does not support a beneficial effect for cognitive impairment or dementia, as summarized in a Cochrane review…”

This month, a new study of ginkgo biloba for prevention of cognitive decline in humans has been published in the Journal of the American Medical Association. It is a large, multicenter, randomized, double-blinded, placebo-controlled prospective clinical trial, and thus represents a very high level of evidence. It concludes quite clearly.\

“Compared with placebo, the use of G biloba, 120 mg twice daily, did not result in less cognitive decline in older adults with normal cognition or with mild cognitive impairment.”

Another nail in the coffin for this particular wonder-herb.

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Exercise in Puppies-Are there rules?

There are many dogmatic opinions available from veterinarians, pet owners, breeders and others concerning a common question owners of new puppies have, How much exercise is ok for puppies? This is an especially pertinent question for owners of large breed puppies, since these breeds have a higher incidence than others of developmental orthopedic disorders such as hip dysplasia, elbow dysplasia, and cartilage abnormalities known as osteochondrosis dissecans (OCD). As is all too often the case, however, these opinions generally lack solid scientific evidence to support them. Very little is known about the precise risks and benefits of different types and intensities of exercise in growing animals.

One case control observational study [1] surveyed dog owners and found playing with other dogs to be a risk factor for OCD. Another, similar study [2] found chasing balls and sticks was a risk factor for development of hip dysplasia and elbow abnormalities. However, these studies cannot answer the overall question, which is how much and what kinds of exercise pose how great a risk and provide how great a benefit. One study [3] found exercise to be part of the treatment of carpal laxity, another joint abnormality seen in large breed puppies, and there is no question that exercise has many benefits, including reducing the risk of obesity and simply being part of a normal, enjoyable life for a puppy.

There are many more studies on the effects of exercise in children than in puppies, and though it is always risky to extrapolate from one species to another, some useful information can be gained by using one organism as a model for another, as long as conclusions drawn in this way are cautious and tentative pending better data. In general, while some intense and repetitive exercise can pose a risk of damage to growth plates in children, exercise is overall seen as beneficial in improving bone density and reducing the risk of obesity and related health problems.

The research evidence, then, really does not provide anything like a definitive answer to questions about the effects of exercise in growing puppies. Common sense suggests that forcing a dog to exercise heavily when it does not wish to is not a good idea. Likewise, puppies sometimes have more enthusiasm than sense and can exercise to the point of heat exhaustion, blistered footpads, and other damage that may be less obvious. Therefore, a general principle of avoiding forced or voluntary extreme exercise is reasonable, but specific and absolute statements about what kind of exercise is allowed, what surfaces puppies should or should not exercise on, and so forth is merely opinion not supported by objective data. Such opinions may very well be informed by personal experience, and they may be reliable, but any opinion not founded on objective data must always be taken with a grain of salt and accepted provisionally until such data is available.

1. Slater MR, Scarlett JM, Donoghue S, Kaderly RE, Bonnett BN, Cockshutt J, et al. Diet and exercise as potential risk factors for osteochondritis dissecans in dogs. Am J Vet Res. 1992 Nov;53(11):2119-24.

2. Sallander MH, Hedhammar A, Trogen ME. Diet, exercise, and weight as risk factors in hip dysplasia and elbow arthrosis in Labrador Retrievers. J Nutr. 2006 Jul;136(7 Suppl):2050S-2052S.

3. Cetinkaya MA, Yardimci C, Sa?lam M. Carpal laxity syndrome in forty-three puppies.Vet Comp Orthop Traumatol. 2007;20(2):126-30.

Posted in Science-Based Veterinary Medicine | 27 Comments