Sinusitis may be divided into two very different categories: Acute Sinusitis and Chronic Sinusitis. The two are separate diseases, since chronic sinusitis is inflammation whereas acute sinusitis is infection; however chronic sinusitis may cause suffers to have recurring acute sinus infections. The sinuses are bony cavities surrounding the nose lined with active ciliary respiratory tract very similar to that of the bronchi of the lung. The sinuses are completely surrounded by bone except for tiny openings than drain into the nasal cavity. The cilia are microscopic hairs that sweep trapped bacteria and mucus to these openings. There are four sets of sinuses: the maxillary sinuses behind the cheek bones, the ethmoid sinuses between the eyes, the frontal sinuses in the forehead and the sphenoid sinuses deep behind the eyes (not shown):
Acute sinusitis is an infection affecting nearly 1 in 7 of all American adults every year. Respiratory viruses and bacteria are equally likely to cause acute sinusitis and produce rapid onset of symptoms that include:
1. sinus pressure or headache,
2. post nasal drip,
3. nasal mucus drainage that is thick and colored (may be yellow, green or brown) and sometimes bloody.
4. sometimes fever
The symptoms caused by viruses and bacteria are usually indistinguishable. Eighty-one percent of adults presenting to clinics with sinusitis symptoms received antibiotics making this the fifth leading reason doctors prescribe antibiotics to outpatients. Since many of these cases are actually viral infections for which antibiotics are inappropriate, this raises serious concerns because of the spiraling cost of medical care, exposure of patients to potentially dangerous side effects or allergic reactions and risks the development of bacterial resistance to these drugs. To prevent this unnecessary use of antibiotics, three criteria suggest that acute sinusitis may be caused by bacteria include:
1. Persistence of symptoms for >=10 days without an improving trend
2. Initially severe symptoms or high fever (> 102oF) lasting >3-4 days
3. Biphasic illness in which the initial sinus symptoms improve then suddenly worsen with a relapse of fever, headache or increase in thick, discolored nasal mucus discharge/post nasal drip.
For any of these cases, an antibiotic prescription is appropriate. In addition, other helpful treatments include saline sinus irrigation or intranasal topical steroids in the form of sprays or aerosols. Decongestants and antihistamines are generally not recommended for acute sinusitis.
Acute sinusitis is related to viral or bacterial infection and is usually limited to a period of less than 2 to 4 weeks. However, chronic sinusitis is an inflammatory condition of the sinuses persisting beyond 8 weeks. It may lead to recurrent acute sinusitis in which there are three or more episodes of infection per year. In chronic sinusitis, inflammation involves the mucus membrane lining the sinuses similar to that of asthma. Instead of a hollow cavity filled with air, patients with chronic sinusitis have a thickened or swollen lining seen on CT scan (see white arrows below).
Symptoms of chronic sinusitis are often subtle but may include nasal congestion, inability to smell, unrelenting cough, pressure in the forehead, cheeks or between the eyes and constant post-nasal drip. Occasionally, the swollen mucus membrane can block the natural drainage of the sinuses and lead to acute infections. Mucus then turns yellow or green and sinus headache appears. Many patients feel fatigued. Antibiotics may clear the infection but have little effect on the underlying inflammation. Chronic sinusitis may be thought of as “asthma” of the sinuses. Some patients have nasal polyps which are basically extensions of the inflamed sinus lining into the nasal cavity. This can lead to symptoms of severe congestion, complete loss of the sense of smell and, especially in children, facial distortion or double vision.
Because the symptoms of chronic sinusitis are often subtle, CT scan may be required to make the diagnosis. Innumerable studies have shown that compared with objective criteria such as CT scans or rhinoscopy, symptoms are little better than random chance in predicting the presence and severity of chronic sinusitis. Although headaches and pressure are routinely present in acute sinusitis, these subjective symptoms are uncommon in chronic sinusitis alone. Surprisingly, a large number of patients referred for chronic sinus headaches actually have migraines and have normal sinus imaging. The CT scan also identifies the anatomy of chronic sinusitis and is also useful for those that go on to sinus surgery. Although chronic sinusitis occurs in the setting of allergic disease, only about half of patients with chronic sinusitis are identified as having allergies. It is important to identify these potential triggers (especially molds) by skin testing or blood testing for allergies. A fewer number of patients with chronic sinusitis have sensitivity to over-the-counter pain relievers such as aspirin or ibuprofen. Unusual causes of chronic sinusitis include immune deficiencies, cystic fibrosis, ciliary dysfunction or immune disorders such as Wegener’s granulomatosis, Churg-Strauss Syndrome and sarcoidosis.
Surprisingly, there is no FDA-approved treatment for chronic sinusitis. A coordinated approach by allergy/immunology specialists and otolaryngologists (ENT surgeons) is the most effective means of managing chronic sinusitis. Treatment may require some combination of maintenance medications to control inflammation, allergy shots, antibiotics to quell infections, steroids for obstructive inflammation or endoscopic sinus surgery. The optimal treatment plan requires careful consideration of all the contributing factors as well as the extent of disease. The goals of a good management program for chronic sinusitis are to:
1. reduce the frequency and severity of acute infections,
2. restore nasal airflow and the sense of smell and
3. reduce exercise intolerance or sleep disturbance caused by congestion.
--- By Dr. John S. Kellogg