RESUMEN
Elongated periods of low flow conditions, which can be termed as streamflow droughts, influence the nutrient (e.g., nitrogen and phosphorus) balance in estuarine systems. Analyzing temporal trends of nutrient fluxes into such systems under different streamflow regimes can complement the understanding about the dynamic evolution of streamflow droughts and their impacts on nutrient levels. The objective of this paper was to evaluate how dynamic evolution of streamflow droughts (from low flow conditions) affects the inorganic nutrient flux in a tropical estuarine system. We analyzed a 20-year time series of streamflow data together with the concentrations of two nutrient parameters-dissolved inorganic phosphorus (DIP) and dissolved inorganic nitrogen (DIN)-in the Lower Apalachicola River that drains into Apalachicola Bay in northeastern Gulf of Mexico, Florida. Our findings revealed that droughts affect the seasonal patterns and fluxes of both DIP and DIN. We also observed post-drought flushing patterns in DIP and contrasting changes in DIP and DIN fluxes in the long-term (20 years here) under different streamflow conditions. Dynamically changing correlations between the streamflow and the fluxes were found throughout different phases of droughts. In the long-term (from 2003 to 2021), the DIP flux in high flows increased by 35.3%, while the flux decreased by 15.7% in low flows. Conversely, DIN flux in high flows showed a decrease of <1.2%, but an increase of <23.7% in low flows after droughts end. The insights from this study highlighted the need for effective regulation plans such as proper nutrient management against streamflow droughts to mitigate negative ecological consequences in estuarine systems such as harmful algal blooms.
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Estuarios , Nitrógeno , Fósforo , Ríos , Movimientos del Agua , Monitoreo del Ambiente , Florida , Estaciones del AñoRESUMEN
PURPOSE: The symptoms of urethral stricture are non-specific and may overlap with other common conditions that can confound diagnosis. Urologists play a key role in the initial evaluation of urethral stricture, currently provide all accepted treatments, and must be familiar with the evaluation, diagnostic tests, and surgical treatments for urethral stricture. MATERIALS AND METHODS: A systematic review of the literature using the Pubmed, Embase, and Cochrane databases (search dates January 1, 1990 to January 12, 2015) was conducted to identify peer-reviewed publications relevant to the diagnosis and treatment of urethral stricture in men. The review yielded an evidence base of 250 articles after application of inclusion/exclusion criteria. The search for the 2023 Amendment was modified to included females and males (search dates December 2015-October 2022 for males; January 1990-October 2022 for females) and a new Key Question on sexual dysfunction was added (search dates: January 1990-10/2022). After inclusion and exclusion criteria were applied, 81 studies were added to the existing evidence base. RESULTS: Once a urethral stricture is diagnosed, clinicians should determine the length and location of the stricture in order to inform treatment. After a period of urethral rest, patients with short (<2cm) bulbar urethral stricture may be treated endoscopically. Urethroplasty may be performed by an experienced surgeon in patients with first time or recurrent anterior and posterior urethral strictures. The best treatment option for urethral stricture in female patients is urethroplasty using oral mucosa grafts or vaginal flaps rather than endoscopic treatment. CONCLUSION: This guideline provides evidence-based guidance to clinicians and patients regarding how to recognize symptoms and signs of a urethral stricture/stenosis, carry out appropriate testing to determine the location and severity of the stricture, and recommend the best options for treatment. The most effective approach for a particular patient is best determined by the individual clinician and patient in the context of that patient's history, values, and goals for treatment.
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Estrechez Uretral , Masculino , Humanos , Femenino , Estrechez Uretral/diagnóstico , Estrechez Uretral/cirugía , Constricción Patológica/cirugía , Resultado del Tratamiento , Uretra/cirugía , Colgajos Quirúrgicos , Procedimientos Quirúrgicos Urológicos MasculinosRESUMEN
PURPOSE: Priapism is a persistent penile erection that continues hours beyond, or is unrelated to, sexual stimulation and results in a prolonged and uncontrolled erection. Given its time-dependent and progressive nature, priapism is a situation that both urologists and emergency medicine practitioners must be familiar with and comfortable managing. METHODOLOGY: A comprehensive search of the literature on acute ischemic priapism and non-ischemic priapism (NIP) was performed by Emergency Care Research Institute for articles published between January 1, 1960 and May 1, 2020. A search of the literature on NIP, recurrent priapism, prolonged erection following intracavernosal vasoactive medication, and priapism in patients with sickle cell disease was conducted by Pacific Northwest Evidence-based Practice Center for articles published between 1946 and February 19, 2021. Searches identified 4117 potentially relevant articles, and 3437 of these were excluded at the title or abstract level for not meeting inclusion criteria. Full texts for the remaining 680 articles were ordered, and ultimately 203 unique articles were included in the report. RESULTS: This Guideline provides a clinical framework for the treatment (non-surgical and surgical) of NIP, recurrent ischemic priapism, and priapism in patients with sickle cell disease. The treatment of patients with a prolonged erection following intracavernosal vasoactive medication is also included. The AUA guideline on the diagnosis of priapism and the treatment of acute ischemic priapism was published in 2021. CONCLUSIONS: All patients with priapism should be evaluated emergently to identify the sub-type of priapism (acute ischemic versus non-ischemic) and those with an acute ischemic event should be provided early intervention when indicated. NIP is not an emergency and treatment must be based on patient objectives, available resources, and clinician experience. Management of recurrent ischemic priapism requires treatment of acute episodes and a focus on future prevention of an acute ischemic event. Sickle cell disease patients presenting with an acute ischemic priapism event should initially be managed with a focus on urologic relief of the erection; standard sickle cell assessment and interventions should be considered concurrent with urologic intervention. Treatment protocols for a prolonged, iatrogenic erection must be differentiated from protocols for true priapism.
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Anemia de Células Falciformes , Priapismo , Anemia de Células Falciformes/complicaciones , Humanos , Isquemia/diagnóstico , Isquemia/etiología , Isquemia/terapia , Masculino , Erección Peniana/fisiología , Pene , Priapismo/diagnóstico , Priapismo/etiología , Priapismo/terapiaRESUMEN
PURPOSE: Priapism is a persistent penile erection that continues hours beyond, or is unrelated to, sexual stimulation and results in a prolonged and uncontrolled erection. Given its time-dependent and progressive nature, priapism is a situation that both urologists and emergency medicine practitioners must be familiar with and comfortable managing. Acute ischemic priapism, characterized by little or no cavernous blood flow and abnormal cavernous blood gases (ie, hypoxic, hypercarbic, acidotic) represents a medical emergency and may lead to cavernosal fibrosis and subsequent erectile dysfunction. MATERIALS AND METHODS: A comprehensive search of the literature was performed by Emergency Care Research Institute for articles published between January 1, 1960 and May 1, 2020. Searches identified 2948 potentially relevant articles, and 2516 of these were excluded at the title or abstract level for not meeting inclusion criteria for any key question. Full texts for the remaining 432 articles were reviewed, and ultimately 137 unique articles were included in the report. RESULTS: This Guideline was developed to inform clinicians on the proper diagnosis and surgical and non-surgical treatment of patients with acute ischemic priapism. This Guideline addresses the role of imaging, adjunctive laboratory testing, early involvement of urologists when presenting to the emergency room, discussion of conservative therapies, enhanced data for patient counseling on risks of erectile dysfunction and surgical complications, specific recommendations on intracavernosal phenylephrine with or without irrigation, the inclusion of novel surgical techniques (eg, tunneling), and early penile prosthesis placement. CONCLUSIONS: All patients with priapism should be evaluated emergently to identify the sub-type of priapism (acute ischemic versus non-ischemic) and those with an acute ischemic event should be provided early intervention. Treatment of the acute ischemic patient must be based on patient objectives, available resources, and clinician experience. As such, a single pathway for managing the condition is oversimplified and no longer appropriate. Using a diversified approach, some men may be treated with intracavernosal injections of phenylephrine alone, others with aspiration/irrigation or distal shunting, and some may undergo non-emergent placement of a penile prosthesis.
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Tratamiento de Urgencia/normas , Disfunción Eréctil/prevención & control , Isquemia/terapia , Priapismo/terapia , Urología/normas , Enfermedad Aguda/terapia , Adulto , Terapia Combinada/métodos , Terapia Combinada/normas , Tratamiento de Urgencia/métodos , Disfunción Eréctil/etiología , Disfunción Eréctil/fisiopatología , Humanos , Isquemia/etiología , Isquemia/fisiopatología , Masculino , América del Norte , Erección Peniana/fisiología , Pene/diagnóstico por imagen , Pene/efectos de los fármacos , Pene/fisiopatología , Pene/cirugía , Fenilefrina/administración & dosificación , Priapismo/diagnóstico , Priapismo/etiología , Priapismo/fisiopatología , Sociedades Médicas/normas , Factores de Tiempo , Ultrasonografía Doppler , Urología/métodosRESUMEN
BACKGROUND: Depression is a common condition in cardiac patients. We investigated the effect of cardiac rehabilitation on depressive symptoms as detected by Beck depression inventory II score (BDI) in patients who underwent percutaneous coronary intervention (PCI). METHODS: In this cohort, 95 patients met our criteria. Patients were then studied in two groups based on their participation in the rehabilitation program to rehabilitation (exposure) and the control (non-exposure) groups. The control group consisted of those who only participated in the introductory session and decided not to continue the program. Finally, demographic and clinical parameters as well as the BDI scores were compared between the study groups. RESULTS: Data of 35 patients who completed rehabilitation program was compared with 60 patients who did not. There was no significant difference between the study groups regarding the demographic and clinical variables, except for a higher frequency of family history for CAD in the control group (p<0.001). The frequency of the patients with no or mild depression was significantly higher in the rehabilitation group than the controls (p=0.02). There was also a significant increase in the BDI score of the control group and a significant decrease in the rehabilitation group (p<0.001). After adjustment for confounders (family history and severity of CAD), not attending the rehabilitation program was a strong risk factor for depression (OR=10.8, 95% CI: 1.3, 88.5; P=0.027). CONCLUSION: Overall, this study showed that not attending cardiac rehabilitation program following elective PCI was a risk factor for depression.
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Rehabilitación Cardiaca/métodos , Angiografía Coronaria/métodos , Enfermedad de la Arteria Coronaria/cirugía , Depresión/epidemiología , Intervención Coronaria Percutánea/rehabilitación , Enfermedad de la Arteria Coronaria/complicaciones , Enfermedad de la Arteria Coronaria/diagnóstico , Depresión/etiología , Depresión/psicología , Femenino , Estudios de Seguimiento , Humanos , Incidencia , Irán/epidemiología , Masculino , Persona de Mediana Edad , Intervención Coronaria Percutánea/psicología , Estudios Prospectivos , Factores de RiesgoRESUMEN
Tris(2-(2-formylphenoxy)ethyl)amine was designed and synthesized by reaction of salicylaldehyde with tris(2-chloroethyl)amine hydrochloride and evaluated as a new multi-functional cross-linker for preparation of new pH- and thermo-responsive chitosan hydrogels through formation of covalent Schiff-base linkage. The structure and properties of the hydrogels were characterized by FT-IR, 1H NMR and scanning electron microscopy (SEM). The swelling behavior of prepared hydrogels at different pHs and temperatures was investigated. Also, in vitro controlled release behavior of the metronidazole model drug was studied with prepared hydrogels. The release profiles of metronidazole from the hydrogels were determined by UV-Vis absorption measurement. The results showed that the new hydrogels exhibit a pH and temperature-responsive swelling ratio. Also, the pH and temperature were found to strongly influence the drug release behavior of these swollen polymers. Due to the concurrent rapid and significant stimuli-response, these smart hydrogels prepared from chitosan as a natural polymer may expand the scope of hydrogel applications in various fields of research such as targeted (cellular or tissue) delivery of drugs. In addition, these new hydrogels can be used to improve bioavailability, sustain release of drugs or solubilize drugs for systemic delivery.
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Aminas/química , Quitosano/química , Portadores de Fármacos/química , Hidrogeles/química , Liberación de Fármacos , Concentración de Iones de Hidrógeno , TemperaturaRESUMEN
Architectural and environmental psychology literature has shown the importance of urban design in provoking stress feelings or enhancing well-being and quality of life. The aim of this contribution is to show the main results of a set of cross-cultural survey studies concerning the perceived quality of urban features at the neighbourhood level. A questionnaire was used including the extended or the short version of the 11 scales measuring Perceived Residential Environment Quality Indicators (PREQIs), which cover architectural, social, functional, and contextual aspects. Both versions of PREQIs showed a similar factorial structure and a good (or at least acceptable) reliability across different geographical contexts, even though some differences emerged in those countries that are more distant from the Western linguistic and cultural milieu. The development of tools like PREQIs should increase a "user-centred" vision on urban issues.
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Comparación Transcultural , Ambiente , Características de la Residencia , Femenino , Francia , Humanos , Italia , Masculino , Análisis de Componente Principal , Medio Social , Encuestas y CuestionariosRESUMEN
STUDY DESIGN: The study is a prospective cross-sectional study of 514 patients with low back pain and sciatica. OBJECTIVE: The aim of this study was to assess the relation of various risk factors on upper and lower lumbar levels. SUMMARY OF BACKGROUND DATA: Various risk factors such as aging, job (physical habits), obesity, and cigarette smoking have been reported to accelerate lumbar degenerative process, possibly to a different extent in upper and lower lumbar spine. Lumbar spine motion segment degenerative process has been radiologically assessed by severity of nucleus pulposus (NP) dislodgement, annular tears, and Modic changes in adjacent end plates. METHODS: Five hundred and fourteen patients with low back pain of at least 4 weeks duration, aged 18 to 70 years were prospectively enrolled. All underwent thorough neurological assessment and lumbar 1.5 T high-resolution magnetic resonance imaging, being evaluated by independent neurosurgeon and neuroradiologists. NP dislodgement and Modic changes as well as neurological findings were graded. Statistical analysis was performed by analysis of variance, t test, chi, and Fisher exact test. RESULTS: There were 244 men and 270 women. Sixty-six percent of lower lumbar levels showed NP dislodgement at least in 1 level. Aging had significant association with NP dislodgement, and patients with lower lumbar NP dislodgement had a mean age, 10 years younger than those with upper lumbar NP dislodgement. There was no significant association between sex, body mass index >25 kg/m, and vibratory job either in upper or lower lumbar levels and NP degeneration. Heavy lifting was associated with upper lumbar NP dislodgement while, sedentary and housework were associated with NP dislodgement only in lower lumbar levels. Also cigarette smoking (> or =10 pack/y) and older age (>50 y) were associated only with upper lumbar NP dislodgement. Modic changes correlated only with advanced age (>50 y), and there was no association with body mass index >25, smoking, job habits and sex. CONCLUSIONS: The study revealed that pathological alteration in vertebral end plates is the same in upper and lower lumbar bony tissues as detected by Modic's criteria, whereas those of intervertebral discs is different regarding spinal level and risk factor.