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A family of oligopolies that possess a unique equilibrium was identified in the second authors doctoral dissertation. For such a family, it is therein specified a class of functions-economically related to the price function of a Cournot oligopoly – that satisfy a particular type of quasi-concavity. The first part of the present article (i) conceptualizes that type of quasi-concavity by introducing the notion of demi-concavity, (ii) considers two possible variants and (iii) provides some calculus properties. The second part, by relying on the results on demi-concavity, proves a Cournot equilibrium uniqueness theorem which is new for the journal literature and subsumes various results thereof. A third part shows an example that illustrates the novelty of the result. [ABSTRACT FROM AUTHOR]

Background: The reported association of allergy and sinusitis varies greatly between study, and the exact role of allergy in predisposing to sinusitis is not clear. We attempted to determine whether patients with perennial allergic rhinitis are at greater risk of developing sinusitis with respect to a control group, and to determine whether there is a correlation between rhinomanometry, endoscopy, and nasal swab, and computed tomography (CT) findings. Methods: Forty adult patients with perennial allergic rhinitis underwent CT scans of the paranasal sinuses, and the results were then compared to CTs of the paranasal sinuses of 30 control subjects. All allergic patients underwent nasal endoscopy, nasal swab, and active anterior rhinomanometry, and the results were studied in relation to the CT findings. Results: We found sinusitis in 67.5% of the allergic patients and in 33.4% of the controls, with a statistically significant difference between the two groups (P=0.017). Twenty‐three patients had a positive nasal swab; 22 showed increased nasal resistance on rhinomanometry, and 36 had positive endoscopy, but the association of CT findings with endoscopy, rhinomanometry, or nasal swab was not statistically significant (P=0.583, P=1.00, P=0.506, respectively). Conclusions: Allergic rhinitis is often associated with sinusitis, but the underlying mechanism has yet to be determined. Evidently, factors other than classical pathogen growth and mechanical factors, such as the association of the various factors and immunologic mechanisms, may contribute to the pathogenesis of chronic sinusitis in allergic patients. [ABSTRACT FROM AUTHOR]

The article presents a study on the reduction of repeated syncope as a result of training in physical counterpressure manoeuvres (PCM) in patients with vasovagal syncope. The study engaged 223 patients with recurrent vasovagal syncope who were given conventional therapy or plus training in PCM such as leg crossing, abdominal and buttock muscles or handgrip. The study reveals that conventional therapy plus PCM lessened the syncope burden than conventional therapy alone.