Holding off Antibiotics for Sinus Infections

bottle of pillsAt many a doctor’s visit, there is often an expectation that the patient goes home with a pill to “fix” the problem. It represents a tangible reminder that the physician has done something — anything — to address the presenting need. There are many scenarios where the use of medication can be easily justified (e.g., high cholesterol, uncontrolled diabetes, hypertension). There are also scenarios where prescribing a pharmacologic agent may be more controversial, such as whether to use of antibiotics or steroids in sinus infections.

In light of growing bacterial drug resistance, and the lag in development of novel antibiotics, there are good reasons to take a conservative approach to prescription writing. Moreover, since current antibiotics predominantly target bacteria and not viruses, the need for antibiotics in infections that are typically viral becomes unclear. Do you empirically treat an infection with drugs or allow the body’s immune system to clear the pathogen on its own?

A randomized controlled study recently performed in the UK tries to address the question of whether antibiotics and/or steroids are beneficial in acute sinusitis. Between 2001 to 2005, 240 adults with
new onset, non-recurrent sinusitis were randomly divided into four groups: treatment with antibiotics (amoxicillin) and nasal steroids (budesonide); placebo antibiotic and steroids; antibiotics and placebo
steroids; and double placebo. The study found that 29% of patients given antibiotics vs. 33.6% without antibiotics experienced symptoms for 10 days or longer. The comparison between steroid and no-steroid use
showed an identical proportion of patients (31.4%) in both groups with symptoms 10 days or longer. The differences are noted to be insignificant.

The authors’ conclusion? . . .

among patients with the typical features of acute bacterial sinusitis, neither an antibiotic nor a topical steroid alone or in combination are effective in altering the symptom severity, the duration, or the natural history of the condition.

Although the small sample size is a limitation of the study, this is purportedly the largest non-pharmaceutically funded study to address the question. Another limitation of the study includes a lack of differentiation between bacterial or viral infections. As mentioned earlier, most viral infections do not typically respond to our current armamentarium of antibiotics.

More research is necessary to validate the results and conclusions. They nevertheless illustrate a point that sometimes no medicine is the best medicine. Of course, there are many more times when directed pharmacologic therapy is vital for a good outcome. But, I would best leave it to the doctor to decide.

  • Source
  • Williamson IG, Rumsby K, Benge S, Moore M, Smith PW, Cross M, Little P. Antibiotics and topical nasal steroid for treatment of acute maxillary sinusitis: a randomized controlled trial. JAMA 2007;298:2487-96.
Occult Hepatitis B Virus in Sweat

A Turkish study, published in the British Journal of Sports Medicine, recently reported the presence of occult hepatitis B virus (HBV) infection in 13% of Turkish Olympic wrestlers. Occult HBV infection is the detectable presence of virus through PCR (polymerase chain reaction), despite the lack of a viral protein called HBsAg (hepatitis B surface antigen) in the blood. The current standard for evaluating hepatitis B infection or immunity relies on measuring hepatitis antibody and antigen markers. By definition, the standard tests used in hospitals did not reveal hepatitis B in these wrestlers even though they were infected. Interestingly, 11% of the wrestlers also secreted HBV in their sweat.

Several studies estimate the HBsAg positivity (indicator for acute or chronic hepatitis B) to be roughly 7% in Turkey. This figure is less than the prevalence of occult HBV found in the wrestlers. For comparison, low-risk regions, such as the United States and Western Europe, have an HBV prevalence of <2%.

Although more studies are needed, it is interesting to speculate the significance of the recent findings. For one, there may be a higher prevalence of hepatitis B infection than earlier believed. It is not standard of care to test individuals for HBV DNA. The occult HBV category may comprise a large yet underdiagnosed group. On the other hand, by nature of their profession, wrestlers sweat copiously and engage in prolonged bodily contact. Their increased risk for exposure could have contributed to the increased prevalence in this population.

Hepatitis B possesses several modes of transmission: maternal-fetal, mucous membranes, exposure to blood via needlestick injuries or contaminated transfusions, and transplantation. Excessive bodily contact has been suggested before as a form of transmission, particularly in children, but the data are unclear. With the finding of HBV DNA in the sweat, we wonder whether this supports transmission through bodily contact and fomites. Should we be concerned about it? Our knowledge in this area of study is still superficial. I am only aware of a few groups engaged in epidemiologic and laboratory-based research of occult HBV. It is nevertheless possible that wrestlers in endemic areas may someday need to get vaccinated prior to participation in sports.

  • Sources
  • Bereket-Yücel S. Risk of hepatitis B infections in Olympic wrestling. Br J Sports Med 2007.
  • Maynard JE. Hepatitis B: global importance and need for control. Vaccine 1990;8 Suppl:S18-20.
  • Mehmet D, Meliksah E, Serif Y, Gunay S, Tuncer O, Zeynep S. Prevalence of hepatitis B infection in the southeastern region of Turkey: comparison of risk factors for HBV infection in rural and urban areas. Jpn J Infect Dis 2005;58:15-9.

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Obesity? Blame It on Bacteria

tape measureIn this week’s issue of the journal Nature, researchers at the Washington University in Saint Louis reported on bacteria and their contribution to obesity. The mouse studies indicated that certain bacterial species were more abundant in obese mice than their lean counterparts. The “obese” bacteria were also found to harvest energy from food more efficiently with less calorie content excreted as waste. Bacterial flora from obese and lean mice were introduced in “germ-free” mice, and mice with the “obese” microbiota experienced a significantly greater increase in body fat. The group had published a related study several years ago, so the idea is not completely novel. On the other hand, it is an interesting concept that has not yet reached common knowledge.

Before anybody blames their gut bacteria as the source of obesity, recall that the study was performed on mice. The findings may or may not translate to humans. The authors describe a related study (Webb et al.) that involved human subjects. Obese individuals were noted to excrete less fecal energy than lean subjects. Although the results were not statistically significant, more research is still needed before discounting bacterial involvement in human obesity. Let us also remember that obesity results from a combination of factors. Dietary intake, physical activity, and genetic composition strongly influence body weight. In the study, the authors equalized food consumption among groups to minimize this possible confounder. Five Big Macs in the mouths of “lean” mice can still produce more weight gain than in “obese” mice fed peanuts.

The implications of the study are fascinating. Consider the potential for future gut therapy (e.g., GoLytely and antibiotic bowel prep, followed by customized bacterial inoculation) to treat obesity or promote weight loss. Time to file my patent!

  • Sources
  • Turnbaugh PJ, Ley RE, Mahowald MA, Magrini V, Mardis ER, Gordon JI. An obesity-associated gut microbiome with increased capacity for energy harvest. Nature 2006;444:1027-31.
  • Backhed F, Ding H, Wang T, Hooper LV, Koh GY, Nagy A, Semenkovich CF, Gordon JI. The gut microbiota as an environmental factor that regulates fat storage. Proc Natl Acad Sci U S A 2004;101:15718-23.
  • Webb P, Annis JF. Adaptation to overeating in lean and overweight men and women. Hum Nutr Clin Nutr 1983;37:117-31.

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Track Flu Trends on Your Desktop

Tamiflu Desktop Flu TrackerRoche Laboratories has produced an interesting marketing adjunct to its famous Tamiflu® (oseltamivir) drug: The Tamiflu Desktop Flu Tracker. The software tracks the latest trends of reported influenza cases throughout the United States and generates a geographical representation of disease demographics. The Desktop Flu Tracker also lets you set alerts for flu outbreaks in different neighborhoods. Additional preventative health information is included. Learn the classic symptoms of flu and how it differs from the common cold.

The program currently runs on Windows (98SE and above). It is not available for the MacOS.

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