Adolescent women possess physiologic and, frequently, behavioral characteristics that place them at an increased risk for contracting sexually transmitted infections. Diagnosis and prompt treatment of sexually transmitted infections is of paramount importance for an adolescent's future fertility and prevention of transmission to future partners. Diagnosis and treatment is often hindered by lack...

Aerosol therapy with a variety of drugs is superior to oral and, except perhaps in status asthmaticus, parenteral therapy. An understanding of aerosol physics and the physiologic characteristics relating to ventilation allows optimum aerosol delivery for maximum benefit in the majority of patients. In those patients who are unable to use metered-dose inhalers effectively, simple inhalation devi...

Nicotine is the primary pharmacologic component of tobacco, and users of tobacco products seek out its effects. The highly addictive nature of nicotine is responsible for its widespread use and difficulty with quitting. This technical report focuses on nicotine and discusses the stages of use in progression to dependence on nicotine-containing products; the physiologic characteristics, neurobio...

During an MR procedure, most of the transmitted RF power is transformed into heat within the patient's tissue as a result of resistive losses. Not surprisingly, the primary bioeffects associated with the RF radiation used for MR procedures are directly related to the thermogenic qualities of this electromagnetic field. This review article discusses the characteristics of RF energy-induced heati...

Background Patients with severe asthma represent a significant unmet clinical need. At present, the underlying mechanisms of severe asthma have not been established yet but it is likely they reflect a heterogenous pattern rather than a single unifying process. The aim of this study is to assess the prevalence of severe asthma as well as the clinical and physiologic characteristics of patients a...

Renal function is characterized by different physiologic aspects, including perfusion, glomerular filtration, interstitial diffusion, and tissue oxygenation. Magnetic resonance imaging (MRI) shows great promise in assessing these renal tissue characteristics noninvasively. The last decade has witnessed a dramatic progress in MRI techniques for renal function assessment. This article briefly des...