The 2012-2013 Influenza Epidemic and the Role of Osteopathic Manipulative Medicine

The Osteopathic Difference

In a normal, nonepidemic influenza season, Thompson et al estimated the average annual US death toll from influenza to be 36,000 of 281 million people.^6,7 To put this in perspective, the 1918-1919 pandemic killed approximately 675,000 of 103 million people in the United States and killed 50 million people worldwide (with the possibility of having killed as many as 100 million people worldwide).⁸ During the pandemic, osteopaths had a substantial impact on patient care: according to Smith,⁹ patients who received conventional (ie, allopathic) medical treatment had a death rate 40 times higher than those who received osteopathic care. Unfortunately, there is no way to tell if the osteopathic success rate can be attributed solely to osteopaths' manual medicine and care philosophy of the body's intrinsic healing abilities over statistical issues of reporting. Given that in 1918 the “standard of care” for allopathic medicine entailed many less sophisticated traditions from the late 19th and early 20th century—such as purgative (eg, calomel) treatments⁸ and, in some (mostly rural) settings, bloodletting^8,10—it is hard to imagine that osteopaths were not more successful with a system of rational healing¹¹ than many of their contemporaries were in fighting this virus.

In 1918, in terms of influenza-related complications such as pneumonia, 3 times as many patients died receiving conventional medical treatment than those receiving osteopathic treatment.^8,12 Ward,¹² addressing the Eastern Osteopathic Association in 1937, suggested that OMT, particularly when applied to cervical and upper thoracic regions, can help the body recruit and optimize its own immune system to fight influenza. The lower death rate from influenza and related complications from the patient population treated by osteopaths may be attributable to the less scientifically rigorous reporting methods of morbidity and mortality.⁸ The difference in death rates may also have been an effect of osteopaths having different “practice rights” than physicians in the allopathic medical community (ie, osteopaths were likely not on staff at allopathic hospitals where patients' deaths were recorded). One thing is certain, however: at the time of the Spanish influenza pandemic, there was a substantial difference in the mortality¹³ of patients who were treated by osteopaths. Furthermore, what remains true today is that lymphatic drainage treatments are a safe and efficacious means of treating patients (Figure 1 and Figure 2).¹⁴ Ward¹² emphasized how OMT applied to the chest cage optimized the function of the ventilatory (ie, respiratory) system and reduced complications, and thereby reduced mortality rates. Osteopathic physicians should pay particular attention to the gentleness of the OMT techniques that they choose to perform on patients.¹⁵

Figure 1.

Suggested sequence for anatomic regions and osteopathic manipulative treatment techniques, adapted from Wallace et al.^{14 a}Performed when the patient is seated. ^bExtremity techniques may need to be repeated in the thoracic region.

Figure 2.

Osteopathic manipulative treatment techniques for the lymphatic system. Adapted from Wallace et al.¹⁴

A review article by Hruby and Hoffman¹⁶ included a helpful, step-by-step pictorial lymphatic treatment sequence for avian influenza that can also be adapted for use with any influenza strain. McConnell¹⁵ and D'Alonzo¹⁷ have highlighted, 80 years apart from each other, the tremendous value of osteopathic manipulative medicine in managing influenza.

Prevention

The best prevention is vaccination for all individuals aged 6 months or older.¹⁸ The most recent accounts from the US Centers for Disease Control and Prevention for the 2012-2013 influenza season estimate the vaccine for this season's influenza strains at 56% overall efficacy, with 9% efficacy for individuals aged 65 years or older who were exposed to the type A H3N2v strain.² Even so, if someone does contract influenza A H3N2v, early antiviral treatment (ie, within the first 48 hours after symptom onset) can alleviate symptoms and decrease the risk of death or severe complicating illness (eg, bronchitis, pneumonia) caused by influenza.^19-21 On the basis of 2009 epidemiologic studies, when determining use of treatment and chemoprophylaxis with antiviral medications, the Advisory Committee on Immunization Practices (ACIP)¹⁸ recommends practicing triage to prioritize the treatment of individuals with a greater risk of complications (Figure 3).

Figure 3.

Population at greater risk of complications due to influenza.¹⁸

Antiviral Treatment and Chemoprophylaxis

In terms of antiviral therapy, the ACIP¹⁸ proposes neuraminidase inhibitors over amantadine and rimantadine antiviral medications, chiefly because of the high level of resistance to amantadine and rimantadine in currently circulating viral strains. Oseltamivir (Tamiflu) and zanamivir (Relenza) are neuraminidase inhibitors and are the antiviral medications of choice for managing influenza, with a sensitivity of more than 99% in currently circulating influenza strains.¹⁸ Because inhalation is its route of administration, zanamivir may prove difficult to use for those with underlying pulmonary disease. Use of oseltamivir oxycarbolate is beneficial: it can be given to most populations, including infants and pregnant women, and thus far it has been proven effective with minimal adverse events. In fact, when looking at a combination of 10 clinical trials, Kaiser et al¹⁹ noted a 50% decrease in pneumonia risk among persons with laboratory-confirmed influenza who received oseltamivir compared with that of those receiving placebo. The most frequently reported adverse effect of taking a neuraminidase inhibitor was nausea and vomiting, especially if the medication was taken on an empty stomach.²¹

The predominant theory of viral transmission is close contact, wherein 1 person inhales large-particle respiratory droplets from another person who is 6 feet away or closer.¹⁸ Persons residing in the same household as a person with pandemic or seasonal influenza should also be treated with antiviral therapy.¹⁸ The use of antivirals does not, however, inhibit viral shedding,^20,22 although patients who acquired influenza from household contacts had a lower rate of viral shedding than the index patient—in other words, the primary patient appeared to shed more viral particles than the household contacts who acquired it from him or her. Physicians should explain to patients, especially patients who have started antiviral therapy, that although oseltamivir may make patients feel better, a patient may nevertheless still be contagious to persons around him or her. Hayden et al²¹ reported that as soon as the antiviral medications were stopped, there was no rebound in viral shedding. Thus, only when symptoms have resolved and when antiviral medications have been discontinued can the patient return to activities of daily living without putting others at greater risk of contracting influenza.²¹

Conclusion

As osteopathic physicians, we have many tools in our armamentarium to manage influenza. In addition to vaccination, adequate hand washing, and common sense hygiene, we can prescribe antiviral medication and use lymphatic pump techniques, as well as other means of OMT. As osteopathic physicians, we should embrace our heritage by continuing the work of our predecessors and by using manual medicine in conjunction with modern means of treatment such as antiviral treatment and chemoprophylaxis. Our osteopathic training enables us to maximize a patient's chances of recovering from the influenza virus with the best prognosis and smallest number of complications possible.²³ Should we face additional waves of new influenza infections in the coming year, the use of the gentle lymphatic treatment techniques and medications such as oseltamivir will likely help prevent many persons from getting the influenza-related complications that took so many lives during the Spanish influenza pandemic of 1918-1919. Our hands-on skills and osteopathic principles and practice continue to guide us in our goals of lessening the effect of influenza and of providing patients relief, as the founders of osteopathic medicine did more than a century ago.