Citations

The respiratory system undergoes many changes with maturation, resulting in increased capacity and efficiency. In an effort to determine the effects of maturation on airway control, laryngeal airway resistance was studied from infancy to adulthood in dogs. Reflex regulation of laryngeal airway resistance in response to chemoreceptor stimulation was found in puppies 1 day of age and older. Chemoreceptor‐mediated laryngeal reflexes were qualitatively similar in all age groups. However, a significant quantitative difference was found. With maturation, an increase in the sensitivity of both central and peripheral chemoreceptors regulating laryngeal resistance is realized.

To define the relationship between central control of upper airway muscles and respiratory muscle function, the electromyographic responses of the dilator nares muscles to stimulation of chemoreceptors and pulmonary receptors were studied in six anesthetized dogs. Only at maximal levels of hypoxia was the inspiratory activity of the dilator nares significantly increased. Hypercapnic stimulation increased the inspiratory activity with each incremental increase in CO2. Pulmonary stretch receptor stimulation produced by lung inflation inhibited dilator nares activity. Pulmonary irritant receptor stimulation by intravenously administered histamine increased dilator nares activity, as did pulmonary J receptor stimulation by the intravenous administration of capsaicin.

Septic necrosis of the internal carotid artery is a major complication of peritonsillar abscess. Although once a common complication, its occurrence is rare since the introduction of antibiotics. A 12‐year‐old girl was referred to our institution after a false aneurysm of the internal carotid artery had been entered during routine tonsillectomy for a peritonsillar abscess. Review of the literature and features of the present case demonstrate the following findings suggestive of erosion of the internal carotid artery as a result of peritonsillar abscess: (1) spontaneous hemorrhage from a peritonsillar abscess, (2) persistent peritonsillar swelling after resolution of symptoms of peritonsillar abscess, (3) ipsilateral Horner's syndrome, and (4) otherwise unexplained cranial nerve palsies (nerves IX, X, XI, and XII).

The etiology, pathophysiology, and natural history of Meniere's syndrome are poorly understood. The reported studies have had inadequate followup or insufficient numbers of patients to allow conclusions about the natural history. Our study group was 119 patients who had the classic symptom complex of episodic vertigo, tinnitus, and hearing loss in the year 1970. After initial review of these charts, follow‐up information was obtained by questionnaire, telephone interview, chart review, or repeat examination, when possible, both in 1983 and in 1988, for a total followup of 18 years. In the patients with followups of at least 14 years, vertiginous episodes had disappeared completely in 50% of patients and somewhat resolved in 28%; hearing was absent in 48% and worse in 21%. Surprisingly, 43% of patients underwent surgery at some point for control of vertigo. Bilateral disease was present initially in 13% and developed subsequently in 45% of patients. Other areas reviewed included the efficacy of long‐term medical treatment, frequency and severity of vertiginous attacks, and contralateral ear symptoms.