5 results on '"Whitehead K"'
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2. The total cavopulmonary connection resistance: a significant impact on single ventricle hemodynamics at rest and exercise.
- Author
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Sundareswaran KS, Pekkan K, Dasi LP, Whitehead K, Sharma S, Kanter KR, Fogel MA, and Yoganathan AP
- Subjects
- Adolescent, Cardiac Catheterization, Cardiac Output, Child, Child, Preschool, Computer Simulation, Databases as Topic, Heart Defects, Congenital pathology, Heart Defects, Congenital surgery, Heart Rate, Humans, Magnetic Resonance Angiography, Magnetic Resonance Imaging, Cine, Models, Anatomic, Models, Cardiovascular, Pulmonary Artery pathology, Pulmonary Artery surgery, Reproducibility of Results, Treatment Outcome, United States, Vascular Resistance, Vena Cava, Inferior pathology, Vena Cava, Inferior surgery, Vena Cava, Superior pathology, Vena Cava, Superior surgery, Exercise Tolerance, Fontan Procedure, Heart Defects, Congenital physiopathology, Hemodynamics, Pulmonary Artery physiopathology, Pulmonary Circulation, Vena Cava, Inferior physiopathology, Vena Cava, Superior physiopathology, Ventricular Function
- Abstract
Little is known about the impact of the total cavopulmonary connection (TCPC) on resting and exercise hemodynamics in a single ventricle (SV) circulation. The aim of this study was to elucidate this mechanism using a lumped parameter model of the SV circulation. Pulmonary vascular resistance (1.96+/-0.80 WU) and systemic vascular resistances (18.4+/-7.2 WU) were obtained from catheterization data on 40 patients with a TCPC. TCPC resistances (0.39+/-0.26 WU) were established using computational fluid dynamic simulations conducted on anatomically accurate three-dimensional models reconstructed from MRI (n=16). These parameters were used in a lumped parameter model of the SV circulation to investigate the impact of TCPC resistance on SV hemodynamics under resting and exercise conditions. A biventricular model was used for comparison. For a biventricular circulation, the cardiac output (CO) dependence on TCPC resistance was negligible (sensitivity=-0.064 l.min(-1).WU(-1)) but not for the SV circulation (sensitivity=-0.88 l.min(-1).WU(-1)). The capacity to increase CO with heart rate was also severely reduced for the SV. At a simulated heart rate of 150 beats/min, the SV patient with the highest resistance (1.08 WU) had a significantly lower increase in CO (20.5%) compared with the SV patient with the lowest resistance (50%) and normal circulation (119%). This was due to the increased afterload (+35%) and decreased preload (-12%) associated with the SV circulation. In conclusion, TCPC resistance has a significant impact on resting hemodynamics and the exercise capacity of patients with a SV physiology.
- Published
- 2008
- Full Text
- View/download PDF
3. Definition and accountability: a youth perspective.
- Author
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Whitehead K, Keshet M, Lombrowski B, Domenico A, and Green D
- Subjects
- Adolescent, Affect, Cognition, Human Rights legislation & jurisprudence, Humans, Social Behavior, United States, Residential Treatment standards
- Abstract
This paper reviews the systemic flaws of residential treatment facilities from a youth perspective concerning the lack of transparency, definition and accountability, and the subsequent mistreatment and human rights violations of youth experiencing emotional, behavioral, and cognitive challenges., (((c) 2007 APA, all rights reserved).)
- Published
- 2007
- Full Text
- View/download PDF
4. Healthcare practices among blacks and whites with urinary tract symptoms.
- Author
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Howard DL, Edwards BG, Whitehead K, Amamoo MA, and Godley PA
- Subjects
- Aged, Aged, 80 and over, Culture, Female, Health Care Surveys, Health Services Accessibility, Humans, Male, Middle Aged, North Carolina, Physician-Patient Relations, Socioeconomic Factors, United States, Urinary Tract pathology, Black or African American psychology, Health Behavior ethnology, Patient Acceptance of Health Care ethnology, Urologic Diseases diagnosis, Urologic Diseases ethnology, White People psychology
- Abstract
Context: The reasons for African-American men to seek care for lower urinary care symptoms has not been determined due to sparse population-based data., Objective: Our study examines the solicitation and receipt of medical care for urinary symptoms among racially oversampled elderly urban and rural cohort of African Americans and whites., Design: Longitudinal analyses were conducted on five North Carolina counties through the Piedmont Health Survey of the Elderly Established Populations for the Epidemiological Study of the Elderly. In 1994, the analytic cohort included 482 African Americans and 407 whites; by 1998, 249 and 222, respectively., Results: In 1994, 49.4% of African Americans presented with lower urinary tract symptoms compared to 56.8% of whites. By 1998, these percentages increased to 60.6% and 70.3%, respectively. African Americans reported more interference with activities of daily living than whites. African Americans were less likely than whites to have regular digital rectal exams (DRE) and were more likely to have never received a DRE at all. Additionally, elders with less educational attainment, those who smoked, those who delayed care quite often and those who used less-experienced physicians were less likely to receive regular DREs., Conclusion: Poor health behavior has the greatest impact on healthcare seeking for lower urinary tract symptoms. These health behavior risk factors are systemic of a lack of health education. Increases in health education among African Americans regarding lower urinary tract symptoms may close the racial disparity in healthcare-seeking behaviors.
- Published
- 2007
5. Unlicensed residential programs: the next challenge in protecting youth.
- Author
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Friedman RM, Pinto A, Behar L, Bush N, Chirolla A, Epstein M, Green A, Hawkins P, Huff B, Huffine C, Mohr W, Seltzer T, Vaughn C, Whitehead K, and Young CK
- Subjects
- Accreditation ethics, Accreditation legislation & jurisprudence, Adolescent, Child, Child Abuse ethics, Child Abuse prevention & control, Consumer Organizations ethics, Consumer Organizations legislation & jurisprudence, Humans, Mental Disorders psychology, Patient Care Team ethics, Patient Care Team legislation & jurisprudence, Quality Assurance, Health Care ethics, Residential Treatment ethics, United States, Child Abuse legislation & jurisprudence, Ethics, Institutional, Licensure, Hospital ethics, Mental Disorders therapy, Quality Assurance, Health Care legislation & jurisprudence, Residential Treatment legislation & jurisprudence
- Abstract
Over the past decade in the United States, the number of private residential facilities for youth has grown exponentially, and many are neither licensed as mental health programs by states, nor accredited by respected national accrediting organizations. The Alliance for the Safe, Therapeutic and Appropriate use of Residential Treatment (A START) is a multi-disciplinary group of mental health professionals and advocates that formed in response to rising concerns about reports from youth, families and journalists describing mistreatment in a number of the unregulated programs. This article summarizes the information gathered by A START regarding unregulated facilities. It provides an overview of common program features, marketing strategies and transportation options. It describes the range of mistreatment and abuse experienced by youth and families, including harsh discipline, inappropriate seclusion and restraint, substandard psychotherapeutic interventions, medical and nutritional neglect, rights violations and death. It reviews the licensing, regulatory and accrediting mechanisms associated with the protection of youth in residential programs, or the lack thereof. Finally, it outlines policy implications and provides recommendations for the protection of youth and families who pursue residential treatment., (2006 APA, all rights reserved)
- Published
- 2006
- Full Text
- View/download PDF
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