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1.
Ann Rheum Dis ; 68(7): 1220-7, 2009 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-18772191

RESUMO

OBJECTIVES: Abatacept is the only agent currently approved to treat rheumatoid arthritis (RA) that targets the co-stimulatory signal required for full T-cell activation. No studies have been conducted on its effect on the synovium, the primary site of pathology. The aim of this study was to determine the synovial effect of abatacept in patients with RA and an inadequate response to tumour necrosis factor alpha (TNFalpha) blocking therapy. METHODS: This first mechanistic study incorporated both dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) and arthroscopy-acquired synovial biopsies before and 16 weeks after therapy, providing tissue for immunohistochemistry and quantitative real-time PCR analyses. RESULTS: Sixteen patients (13 women) were studied; all had previously failed TNFalpha-blocking therapy. Fifteen patients completed the study. Synovial biopsies showed a small reduction in cellular content, which was significant only for B cells. The quantitative PCR showed a reduction in expression for most inflammatory genes (Wald statistic of p<0.01 indicating a significant treatment effect), with particular reduction in IFNgamma of -52% (95% CI -73 to -15, p<0.05); this correlated well with MRI improvements. In addition, favourable changes in the osteoprotegerin and receptor activator of nuclear factor kappa B levels were noted. DCE-MRI showed a reduction of 15-40% in MRI parameters. CONCLUSION: These results indicate that abatacept reduces the inflammatory status of the synovium without disrupting cellular homeostasis. The reductions in gene expression influence bone positively and suggest a basis for the recently demonstrated radiological improvements that have been seen with abatacept treatment in patients with RA.


Assuntos
Antirreumáticos/farmacologia , Artrite Reumatoide/tratamento farmacológico , Imunoconjugados/farmacologia , Fator de Necrose Tumoral alfa/antagonistas & inibidores , Abatacepte , Artrite Reumatoide/patologia , Feminino , Expressão Gênica , Humanos , Imuno-Histoquímica , Imageamento por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Projetos Piloto , Estudos Prospectivos , RNA Mensageiro/análise , Resultado do Tratamento , Fator de Necrose Tumoral alfa/genética
2.
Scand J Rheumatol ; 38(2): 79-83, 2009.
Artigo em Inglês | MEDLINE | ID: mdl-19177263

RESUMO

OBJECTIVES: The aim of this study was to determine whether magnetic resonance imaging (MRI)-related entheseal changes including osteitis and extracapsular oedema could be used to differentiate between metacarpophalangeal (MCP) joint involvement in rheumatoid arthritis (RA) and psoriatic arthritis (PsA). METHODS: Twenty patients (10 each with early RA and PsA) had dynamic contrast-enhanced MRI (DCE-MRI) of swollen MCP joints. Synovitis and tenosynovitis was calculated using quantitative analysis including the degree and kinetics of enhancement of gadolinium diethylenetriaminepentaacetic acid (Gd-DTPA). Periarticular bone erosion and bone oedema were scored using the Outcome Measures in Rheumatology Clinical Trials (OMERACT) proposals. Entheseal-related features including extracapsular soft tissue enhancement or regions of diffuse bone oedema were also evaluated. RESULTS: MRI was not able to differentiate at the group level between both cohorts on the basis of entheseal-related disease but a subgroup of PsA patients had diffuse extracapsular enhancement (30%) or diffuse bone oedema (20%). The RA patient group had a greater degree of MCP synovitis (p<0.0001) and tenosynovitis than PsA patients (p<0.0001). There were no significant differences in either the total number of erosions (p = 0.315) or the presence of periarticular bone oedema (p = 0.105) between the groups. CONCLUSION: Although conventional MRI shows evidence of an enthesitis-associated pathology in the MCP joints in PsA, this is not sufficiently common to be of diagnostic utility.


Assuntos
Artrite Psoriásica/diagnóstico , Artrite Reumatoide/diagnóstico , Imageamento por Ressonância Magnética/métodos , Articulação Metacarpofalângica/patologia , Adulto , Idoso , Artrite Psoriásica/complicações , Artrite Reumatoide/complicações , Diagnóstico Diferencial , Edema/diagnóstico , Edema/etiologia , Feminino , Gadolínio DTPA , Humanos , Cápsula Articular/patologia , Masculino , Articulação Metacarpofalângica/fisiopatologia , Pessoa de Meia-Idade , Osteíte/diagnóstico , Osteíte/fisiopatologia , Sinovite/diagnóstico , Sinovite/etiologia , Tenossinovite/diagnóstico , Tenossinovite/etiologia , Adulto Jovem
3.
Circulation ; 103(21): 2585-90, 2001 May 29.
Artigo em Inglês | MEDLINE | ID: mdl-11382728

RESUMO

BACKGROUND: The purpose of this study was to evaluate the long-term outcome of all pediatric epicardial pacing leads. METHODS AND RESULTS: All epicardial leads and 1239 outpatient visits between January 1, 1983, and June 30, 2000, were retrospectively reviewed. Pacing and sensing thresholds were reviewed at implant, at 1 month, and at subsequent 6-month intervals. Lead failure was defined as the need for replacement or abandonment due to pacing or sensing problems, lead fracture, or phrenic/muscle stimulation. A total of 123 patients underwent 207 epicardial lead (60 atrial/147 ventricular, 40% steroid) implantations (median age at implant was 4.1 years [range 1 day to 21 years]). Congenital heart disease was present in 103 (84%) of the patients. Epicardial leads were followed for 29 months (range 1 to 207 months). The 1-, 2-, and 5-year lead survival was 96%, 90%, and 74%, respectively. Compared with conventional epicardial leads, both atrial and ventricular steroid leads had better stimulation thresholds 1 month after implantation; however, only ventricular steroid leads had improved chronic pacing thresholds (at 2 years: for steroid leads, 1.9 muJ [from 0.26 to 16 mu]; for nonsteroid leads, 4.7 muJ [from 0.6 to 25 muJ]; P<0.01). Ventricular sensing was significantly better in steroid leads 1 month after lead implantation (at 2 years: for steroid leads, 8 mV [from 4 to 31 mV]; for nonsteroid leads, 4 mV [from 0.7 to 10 mV]; P<0.01). Neither congenital heart disease, lead implantation with a concomitant cardiac operation, age or weight at implantation, nor the chamber paced was predictive of lead failure. CONCLUSIONS: Steroid epicardial leads demonstrated relatively stable acute and chronic pacing and sensing thresholds. In this evaluation of >200 epicardial leads, lead survival was good, with steroid-eluting leads demonstrating results similar to those found with historical conventional endocardial leads.


Assuntos
Marca-Passo Artificial , Doenças Vasculares/terapia , Adolescente , Adulto , Criança , Pré-Escolar , Seguimentos , Coração/fisiopatologia , Humanos , Lactente , Recém-Nascido , Taxa de Sobrevida , Resultado do Tratamento , Doenças Vasculares/mortalidade
4.
J Am Coll Cardiol ; 29(2): 403-7, 1997 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-9014996

RESUMO

OBJECTIVES: The purpose of this study was to characterize anterograde and retrograde properties of the atrioventricular (AV) node in children and to determine the presence of ventriculoatrial (VA) conduction and dual AV node pathways. BACKGROUND: Although AV node reentry is common in adults, it accounts for 13% of pediatric supraventricular tachycardia (SVT). The age-related changes in the AV node with development are poorly understood. The incidence of dual AV node pathways and VA conduction in the pediatric population is unknown. METHODS: Electrophysiologic studies were performed in 79 patients with normal hearts and no evidence of AV node arrhythmias. Patients were classified into two groups by age: group I = 49 patients (0.39 to 12.8 years old, mean [+/- SD] age 8.5 +/- 3.6); group II = 30 patients (13.4 to 20.0 years old, mean age 15.6 +/- 1.8). RESULTS: There was a significant difference (p < 0.05) in the cycle length (CL) at which anterograde AV block occurred between group I (305 +/- 63 ms) and group II (350 +/- 91 ms). Sixty-one percent of children had VA conduction with no age-related differences. There was no significant difference in the mean CL of retrograde VA block (360 ms). The incidence of dual AV node pathways in group I was 15% and 44% in group II (p < 0.05). CONCLUSIONS: These findings suggest that AV node electrophysiology undergoes maturational changes. The increase in AV node reentrant tachycardia in adults may relate to changes in the relative refractoriness and conduction of the AV node or to differences in autonomic input into the AV node that allow dual pathway physiology to progress to SVT.


Assuntos
Arritmias Cardíacas/fisiopatologia , Nó Atrioventricular/fisiologia , Adolescente , Adulto , Envelhecimento/fisiologia , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Masculino , Taquicardia Supraventricular/fisiopatologia
5.
J Am Coll Cardiol ; 21(3): 571-83, 1993 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-8436737

RESUMO

OBJECTIVES: This study retrospectively assesses the technical aspects of the catheter techniques used to ablate 83 accessory atrioventricular (AV) pathways during 88 procedures in 71 pediatric and adult patients (median age 14 years, range 1 month to 55 years). A number of catheter approaches and techniques evolved that may have improved success and shortened procedure times. BACKGROUND: Radiofrequency catheter ablation of accessory AV pathways can be highly successful. However, the technical difficulty of many of the procedures is masked by the success rate. METHODS: Left free wall, right free wall and septal accessory pathways were ablated with a variety of approaches. RESULTS: Left free wall pathways were ablated successfully by using a standard retrograde approach through the aortic valve in only 10 (24%) of 43 cases. The remaining 33 (76%) required an approach that was either retrograde through the mitral valve (2 of 33), transseptal (21 of 33) or retrograde where the catheter was advanced behind the posterior mitral leaflet at the point of mitral-aortic continuity, so that the catheter course was parallel rather than perpendicular to the mitral anulus (10 of 33). Nineteen of 20 septal pathways were ablated successfully by using either the parallel approach (2 of 29), a transseptal approach (2 of 19), ablation within the coronary sinus or one of its veins (8 of 19) or ablation on the atrial side of the tricuspid valve (7 of 19). Fifteen of 20 right free wall pathways were ablated successfully with a variety of approaches on both the atrial and the ventricular side of the tricuspid valve. Long vascular sheaths were judged to contribute directly to success in 33 (43%) of 77 pathways. The overall success rate has been 93% (77 of 83 pathways), with 100% success for left free wall (43 of 43), 75% for right free wall (15 of 20) and 95% for septal pathways (19 of 20). CONCLUSIONS: Thus, successful ablation of accessory AV pathways in a mixed group of pediatric and adult patients appears to benefit from a wide range of vascular and catheter approaches.


Assuntos
Ablação por Cateter/métodos , Sistema de Condução Cardíaco/cirurgia , Síndrome de Wolff-Parkinson-White/cirurgia , Adolescente , Adulto , Estimulação Cardíaca Artificial , Criança , Pré-Escolar , Eletrocardiografia , Cardiopatias Congênitas/cirurgia , Humanos , Lactente , Cuidados Intraoperatórios/métodos , Pessoa de Meia-Idade , Estudos Retrospectivos , Síndrome de Wolff-Parkinson-White/epidemiologia
6.
Arch Intern Med ; 161(5): 657-63, 2001 Mar 12.
Artigo em Inglês | MEDLINE | ID: mdl-11231697

RESUMO

BACKGROUND: Studies show that patient requests for physician-assisted suicide (PAS) are a relatively common clinical occurrence. The purpose of this study was to describe how experienced physicians assess and respond to requests for assisted suicide. METHODS: Focused ethnography in the offices of 11 acquired immunodeficiency syndrome physicians, 8 oncologists, and 1 hospice physician who had received requests for assisted suicide in their practice. Ten had facilitated PAS. RESULTS: Informants had a similar approach to evaluating patients who requested assisted suicide, often asking, "Why do you want to die now?" Reasons for requests fell into 3 broad categories: physical symptoms, psychological issues, and existential suffering. Physicians thought they competently addressed patients' physical symptoms, and this obviated most requests. They treated depression empirically and believed they did not assist depressed patients with assisted suicide. Physicians had difficulty addressing patients' existential suffering, which led to most facilitated requests. Informants rarely talked to colleagues about requests for assisted suicide, suggesting a "professional code of silence." CONCLUSIONS: Regardless of divergent attitudes about PAS, physicians respond similarly to requests for assisted suicide from their patients, creating a common ground for professional dialogue. Our sample addressed physical suffering aggressively, treated depression empirically, but struggled with requests arising from existential suffering. A professional code of silence regarding PAS creates professional isolation. Clinicians do not share knowledge or receive social support from peers about their decisions regarding assisted suicide. Educational strategies drawing on approaches used by experienced clinicians may create an atmosphere that enables physicians with divergent beliefs to discuss this difficult subject.


Assuntos
Relações Médico-Paciente , Suicídio Assistido/psicologia , Doente Terminal/psicologia , Adulto , Antropologia Cultural , Atitude do Pessoal de Saúde , Comunicação , Etnicidade , Feminino , Humanos , Entrevistas como Assunto , Masculino , Pessoa de Meia-Idade , Dor/psicologia , Papel do Médico , Padrões de Prática Médica , Estresse Psicológico , Suicídio Assistido/legislação & jurisprudência
7.
Am J Cardiol ; 74(4): 353-6, 1994 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-8059697

RESUMO

This report describes the use of programmed atrial stimulation via the esophagus to predict the clinical efficacy of various management strategies for supraventricular arrhythmias in infants and children. A total of 203 transesophageal electrophysiologic studies were performed in 132 patients. Therapies evaluated included medications from each antiarrhythmic class, the Valsalva maneuver, follow-up of radiofrequency ablation, and no therapy. The transesophageal technique appeared to be adequate for inducing tachycardia, yielding a low false-negative rate. Overall, the predictive value of a negative study was high (89%), and increased to 96% when stimulation was performed in the presence of isoproterenol. However, the positive predictive value was significantly lower both with (72%, p < 0.00001) and without (60%, p < 0.0001) isoproterenol. These results were due in part to a very low positive predictive value when evaluating either digoxin and/or beta-blocker therapy, 62% vs 82% for the remaining studies. When clinical tachycardia cannot be induced with therapy, transesophageal techniques can be used to predict freedom from many supraventricular tachycardias for most therapies in children. However, induction of tachycardia may not predict treatment failure. Transesophageal pacing to evaluate arrhythmia therapy may be most useful when managing either severe symptoms, multiple recurrences, or the results of radiofrequency ablation.


Assuntos
Estimulação Cardíaca Artificial/métodos , Esôfago , Taquicardia Supraventricular/terapia , Antiarrítmicos/uso terapêutico , Ablação por Cateter , Criança , Pré-Escolar , Seguimentos , Sistema de Condução Cardíaco/fisiopatologia , Humanos , Lactente , Valor Preditivo dos Testes , Estudos Retrospectivos , Taquicardia Supraventricular/diagnóstico , Taquicardia Supraventricular/epidemiologia , Fatores de Tempo , Manobra de Valsalva
8.
Am J Cardiol ; 66(3): 340-5, 1990 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-2368680

RESUMO

From 1946 to March 1989, 92 patients (33 women and 59 men) were seen with ventricular septal defect (VSD) and audible aortic regurgitation (AR). The VSD was subcristal in 62 patients, subpulmonary in 21 and unknown in the remaining 9. The median age of onset of AR was 5.3 years. The risk of developing AR was 2.5 times greater in those with a subpulmonary VSD. The aortic valve was tricuspid in 90% and bicuspid in 10%. Prolapse was seen in 90% of those with subcristal VSD and in all with subpulmonary VSD. Pulmonary stenosis was seen in 46% of the patients with gradients ranging from 10 to 55 mm Hg. The incidence of infective endocarditis was 15 episodes/1,000 patient years. Among 20 patients followed medically, for 297 patient years, 1 died (1959) and most have been stable, including 2 followed for greater than 30 years. In the 72 patients operated on, there were 15 perioperative and 5 late deaths. Operations consisted of VSD closure alone in 7, VSD closure and valvuloplasty in 50 and VSD closure and aortic valve replacement in the other 15. Valvuloplasty was more effective in those operated on under age 10 compared to those older than 15 years (46 vs 14%). The durability of the valvuloplasty was 76% at 12 years and 51% at 18 years.


Assuntos
Insuficiência da Valva Aórtica/complicações , Comunicação Interventricular/complicações , Análise Atuarial , Fatores Etários , Insuficiência da Valva Aórtica/diagnóstico , Insuficiência da Valva Aórtica/cirurgia , Prolapso da Valva Aórtica/complicações , Prolapso da Valva Aórtica/cirurgia , Endocardite Bacteriana/complicações , Feminino , Seguimentos , Comunicação Interventricular/cirurgia , Humanos , Masculino , Estenose da Valva Pulmonar/complicações , Reoperação
9.
J Thorac Cardiovasc Surg ; 109(2): 303-10, 1995 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-7853883

RESUMO

UNLABELLED: Intraatrial baffling procedures such as the Mustard or Senning repair of transposition of the great arteries have been associated with a high incidence of cardiac arrhythmias. These abnormalities are thought to arise from trauma to the sinus node and atrial muscle during the procedure. In the arterial switch operation, there is little intraatrial manipulation other than the repair of the atrial septal defect. In theory, rhythm disturbances after the arterial switch operation should be less prevalent. From January 1, 1983, to December 31, 1990, 390 patients (230 with intact ventricular septum and 160 with a coexisting ventricular septal defect) underwent an arterial switch operation. Electrocardiograms and 24-hour Holter monitor studies were obtained in the 364 survivors at hospital discharge and during follow-up. Limited intracardiac electrophysiologic studies were performed 6 to 12 months after the operation. RESULTS: Atrioventricular node function was preserved in most patients; seven patients (2%) had first-degree, two (0.7%) second-degree, and five (1.7%) had complete atrioventricular block (all with coexisting ventricular septal defect). All five patients with complete heart block received a permanent pacemaker. In those patients not having a permanent pacemaker, sinus rhythm was present in 96% on the surface electrocardiogram and 99% during 24-hour Holter monitor studies (1 month to 8.5 years, mean 2.1 years after the operation). Intracardiac electrophysiologic studies (n = 158) demonstrated normal corrected sinus node recovery times and AH intervals in 97% of patients. Atrial ectopy was present in 152 of 172 (81%) patients, with the majority (64%) of patients having only occasional premature beats without repetitive forms. Ventricular ectopy was a frequent finding during 24-hour monitoring. At hospital discharge 70% had ventricular ectopy; these values fell to 57% (in patients with intact ventricular septum) and 30% (in patients with a coexisting ventricular septal defect) at follow-up. In the early postoperative period, there were 25 episodes of supraventricular tachycardia (14 of which required therapy), 6 episodes of junctional ectopic tachycardia, and 9 episodes of ventricular tachycardia. The incidence of supraventricular tachycardia had fallen to 5% at follow-up, with no atrial flutter or fibrillation noted. Three patients had ventricular tachycardia on follow-up Holter studies. In summary, our results confirm the theoretical advantages of anatomic correction over atrial level correction of transposition of the great arteries with respect to preservation of sinus node function and low incidence of clinically significant tachyarrhythmias.


Assuntos
Arritmias Cardíacas/etiologia , Sistema de Condução Cardíaco/fisiopatologia , Complicações Pós-Operatórias/etiologia , Transposição dos Grandes Vasos/cirurgia , Arritmias Cardíacas/epidemiologia , Arritmias Cardíacas/fisiopatologia , Cateterismo Cardíaco , Eletrocardiografia , Eletrocardiografia Ambulatorial , Seguimentos , Comunicação Interventricular/cirurgia , Humanos , Incidência , Lactente , Recém-Nascido , Complicações Pós-Operatórias/epidemiologia , Complicações Pós-Operatórias/fisiopatologia , Fatores de Tempo
10.
J Thorac Cardiovasc Surg ; 120(5): 891-900, 2000 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-11044315

RESUMO

OBJECTIVE: To determine whether operations that theoretically jeopardize the sinus node (hemi-Fontan and/or lateral tunnel Fontan procedures) are associated with a greater risk of sinus node dysfunction than those that theoretically spare the sinus node (bidirectional Glenn and/or extracardiac conduit). METHODS: Between January 1, 1996, and December 31, 1999, a prospective cohort study was conducted evaluating the incidence of sinus node dysfunction in patients undergoing a bidirectional Glenn or hemi-Fontan procedure and those in whom the Fontan repair was completed with either an extracardiac conduit or a lateral tunnel. Sinus node dysfunction was defined (1) as a heart rate more than 2 SD below age-adjusted norms or (2) as a predominant junctional rhythm and/or a sinus pause of more than 3 seconds as determined by the resting electrocardiogram and/or ambulatory monitoring at hospital discharge. RESULTS: Fifty-one patients had a bidirectional Glenn shunt (mean age 7.8 +/- 5.1 months) and 79 a hemi-Fontan procedure (mean age 6.9 +/- 2.8 months). The incidence of sinus node dysfunction on postoperative day 1 was significantly higher after the hemi-Fontan (36%) than after the bidirectional Glenn shunt (9.8%); however, by hospital discharge this difference was no longer apparent (hemi-Fontan [8%]; bidirectional Glenn [6%]; P = not significant). No difference in early sinus node dysfunction was discernible after the extracardiac conduit (4/30 [13%]) compared with the lateral tunnel Fontan procedure (6/46 [13%]) (P = not significant). No diagnostic or perioperative variables were predictive of sinus node dysfunction. CONCLUSIONS: Avoidance of surgery near the sinus node has no discernible effect on the development of early sinus node dysfunction. Thus, concerns about early sinus node dysfunction should not override patient anatomy or surgeon preference as determinants of which cavopulmonary anastomosis to perform.


Assuntos
Técnica de Fontan/métodos , Cardiopatias Congênitas/cirurgia , Complicações Pós-Operatórias/etiologia , Artéria Pulmonar/cirurgia , Nó Sinoatrial/fisiopatologia , Veia Cava Superior/cirurgia , Anastomose Cirúrgica/efeitos adversos , Anastomose Cirúrgica/métodos , Distribuição de Qui-Quadrado , Feminino , Técnica de Fontan/efeitos adversos , Humanos , Lactente , Masculino , Estudos Prospectivos , Resultado do Tratamento
11.
J Thorac Cardiovasc Surg ; 121(4): 804-11, 2001 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-11279424

RESUMO

OBJECTIVES: There is an increasing incidence of sinus node dysfunction after the Fontan procedure. Inability to maintain atrioventricular synchrony after the Fontan operation has been associated with an adverse late outcome. Although pacing may be helpful as a primary or adjunct modality after the Fontan procedure, the effects of performing a late thoracotomy or sternotomy for epicardial pacemaker implantation are unknown. In addition, little is known about the long-term effectiveness of epicardial leads in patients with single ventricles. The purpose of this study was to compare the hospital course and follow-up of epicardial pacing lead implantation in patients with Fontan physiology and patients with 2-ventricle physiology. METHODS: We retrospectively reviewed all isolated epicardial pacemaker implantations and outpatient evaluations performed between January 1983 and June 2000. RESULTS: There was no difference in the perioperative course for the 31 Fontan patients (27 atrial and 41 ventricular leads [68 total]) compared with the 56 non-Fontan subjects (9 atrial and 61 ventricular leads [70 total]). The median length of stay in Fontan and non-Fontan patients was 3 and 4 days, respectively. There was no early mortality in either group. Pleural drainage for 5 days or longer was reported in 4% of the Fontan cohort and 3% of the non-Fontan group. Late pleural effusions were identified in only 2 patients in the Fontan group and 2 patients in the non-Fontan group. There was no significant difference in epicardial lead survival between the Fontan group and the non-Fontan group (1 year, 96%; 2 years, 90%; 5 years, 70%). The overall incidence of lead failure was 17% (24/138). CONCLUSIONS: Epicardial leads can be safely placed in Fontan patients at no additional risk compared to patients with biventricular physiology. Sensing and pacing qualities were relatively constant in both the Fontan and non-Fontan groups over the first 2 years after implantation.


Assuntos
Arritmia Sinusal/terapia , Estimulação Cardíaca Artificial/métodos , Técnica de Fontan/efeitos adversos , Cardiopatias Congênitas/cirurgia , Marca-Passo Artificial , Pericárdio , Nó Sinoatrial/fisiopatologia , Adolescente , Adulto , Arritmia Sinusal/etiologia , Arritmia Sinusal/fisiopatologia , Criança , Pré-Escolar , Seguimentos , Frequência Cardíaca , Humanos , Lactente , Recém-Nascido , Prognóstico , Estudos Retrospectivos
12.
Ann Thorac Surg ; 66(4): 1383-8, 1998 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-9800837

RESUMO

BACKGROUND: The Ross procedure is performed for a variety of left ventricular outflow tract diseases in children. The preoperative hemodynamic burden of pressure or volume overload and associated ventricular hypertrophy can predispose to ventricular arrhythmias. Additional procedures performed with the Ross procedure (eg, Konno) may damage the conduction system. METHODS: Between January 1995 and February 1997, the Ross procedure was performed in 42 patients, 31 (74%) of whom had 71 prior interventions. Concomitant procedures (n = 42 in 23 patients) included 17 annular-enlarging procedures. Screening was performed for perioperative conduction and rhythm abnormalities. RESULTS: There was one postoperative death. Perioperative ventricular tachycardia occurred in 12 patients (29%), with 2 receiving antiarrhythmic medication for ventricular tachycardia at discharge. Transient complete heart block occurred in 3 patients, all of whom had concomitant procedures performed in the subaortic area; all patients were discharged in sinus rhythm and no patient received a permanent pacemaker. CONCLUSIONS: The Ross procedure can be performed successfully in children with complex cardiac disease with low mortality and perioperative morbidity. The incidence of perioperative ventricular tachycardia is high (29%), suggesting the need for vigilant perioperative monitoring and long-term surveillance.


Assuntos
Arritmias Cardíacas/epidemiologia , Procedimentos Cirúrgicos Cardíacos/efeitos adversos , Taquicardia Ventricular/epidemiologia , Obstrução do Fluxo Ventricular Externo/cirurgia , Arritmias Cardíacas/etiologia , Procedimentos Cirúrgicos Cardíacos/métodos , Criança , Eletrocardiografia , Feminino , Humanos , Incidência , Masculino , Morbidade , Complicações Pós-Operatórias/epidemiologia , Complicações Pós-Operatórias/etiologia , Fatores de Risco , Taquicardia Ventricular/etiologia
13.
Ann Thorac Surg ; 71(6): 2057-8, 2001 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-11426808

RESUMO

We describe a simple technique for the implantation of left atrial epicardial pacing leads in children with congenital heart disease who have undergone multiple operations. The pulmonary veins are exposed to reveal the pulmonary venous to atrial confluence using a left thoracotomy. A pacemaker lead is secured to the posterior left atrium inferior to the lower pulmonary vein. This approach provides a reliable site for atrial lead placement without the need for extensive dissection.


Assuntos
Eletrodos Implantados , Cardiopatias Congênitas/cirurgia , Marca-Passo Artificial , Pericárdio , Complicações Pós-Operatórias/terapia , Criança , Átrios do Coração , Humanos , Veias Pulmonares , Reoperação
14.
Ann Thorac Surg ; 68(6): 2314-9, 1999 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-10617023

RESUMO

BACKGROUND: Complex congenital heart disease (CHD) often necessitates the use of epicardial pacing. Adequate right atrial (RA) sensing and pacing thresholds are often difficult to obtain due to suture line scarring and RA dilatation. The purpose of this study was to evaluate the placement of left atrial (LA) epicardial leads in children. METHODS: Patient demographics, pacing, and sensing data of atrial pacing systems implanted between January 1994 and January 1997 were collected. RESULTS: Forty-nine pacing systems were implanted: 14 LA epicardial, 19 RA epicardial, and 16 transvenous in the right atrium. Lead impedance, current, and energy were similar in the two epicardial groups throughout the study. Energy thresholds (ET) were lower in the LA than RA at 6 months, and 1 and 2 years (p < 0.05). Analysis of post-Fontan patients performed alone revealed a lower ET in the LA as compared with the RA. Pacing and sensing parameters from transvenous leads are presented for relative comparison. CONCLUSIONS: Transvenous leads are most efficient but often contraindicated in complex CHD. LA leads offer lower energy thresholds than RA leads with similar sensing parameters.


Assuntos
Cardiopatias Congênitas/complicações , Marca-Passo Artificial , Adolescente , Arritmias Cardíacas/etiologia , Arritmias Cardíacas/terapia , Estimulação Cardíaca Artificial/métodos , Criança , Feminino , Seguimentos , Átrios do Coração , Cardiopatias Congênitas/cirurgia , Humanos , Masculino , Pericárdio , Estudos Retrospectivos
15.
Soc Sci Med ; 48(9): 1189-203, 1999 May.
Artigo em Inglês | MEDLINE | ID: mdl-10220019

RESUMO

This article explores the meaning of diagnostic tests for people with chronic back pain. Lower back pain is one of the most common health problems in the US. Five to ten percent of the patients who visit a primary care provider for back pain ultimately develop a chronic condition. We draw on interviews with chronic back pain patients in Atlanta, Dallas and Seattle to argue that testing constitutes an important element in the legitimation of pain for these patients. We discuss three aspects that make testing an area of concern for patients: a strong historical connection between visual images and the medicalization of the interior of the body, a set of cultural assumptions that make seeing into the body central to confirming and normalizing patients' symptoms, and the concreteness of diagnostic images themselves. Our interviews show that when physicians cannot locate the problem or express doubt about the possibility of a solution, patients feel that their pain is disconfirmed. Faced with the disjunction between the cultural model of the visible body and the private experience of pain, patients are alienated not only from individual physicians but from an important aspect of the symbolic world of medicine. This paper concludes by suggesting that a fluid, less localized understanding of pain could provide a greater sense of legitimacy for back pain patients.


Assuntos
Dor nas Costas/diagnóstico , Adulto , Dor nas Costas/diagnóstico por imagem , Dor nas Costas/psicologia , Doença Crônica , Cultura , Imagem Eidética , Feminino , Humanos , Dor Lombar/diagnóstico , Dor Lombar/diagnóstico por imagem , Dor Lombar/psicologia , Imageamento por Ressonância Magnética , Masculino , Relações Médico-Paciente , Transtornos Psicofisiológicos , Radiografia
16.
Clin Perinatol ; 28(1): 187-207, vii, 2001 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-11265506

RESUMO

Perinatal arrhythmias may occur either during fetal life or in the early neonatal period. These arrhythmias include both tachycardias and bradycardias. This article presents a brief overview of fetal and neonatal arrhythmias concentrating on their presentation, diagnosis, and treatment.


Assuntos
Bradicardia/diagnóstico , Bradicardia/terapia , Doenças Fetais/diagnóstico , Doenças Fetais/terapia , Assistência Perinatal/métodos , Cuidado Pré-Natal/métodos , Taquicardia/diagnóstico , Taquicardia/terapia , Bradicardia/etiologia , Bradicardia/fisiopatologia , Diagnóstico Diferencial , Eletrocardiografia , Humanos , Recém-Nascido , Fatores de Risco , Taquicardia/etiologia , Taquicardia/fisiopatologia
17.
Prog Pediatr Cardiol ; 13(1): 3-10, 2001 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-11413054

RESUMO

Atrioventricular node reentry tachycardia (AVNRT) is a significant cause of paroxysmal supraventricular tachycardia (SVT) in the pediatric population. Symptoms can include palpitations, chest pain, fatigue, light-headedness and syncope. AVNRT is a reentry tachycardia that is comprised of dual conduction pathways through the AV node. On electrocardiogram, AVNRT usually manifests as a regular tachycardia with a narrow QRS complex and P waves that are either absent or distort the terminal portion of the QRS complex. Electrophysiology study will reveal dual AV node pathways: a fast pathway with a short AH interval and a long effective refractory period (ERP); and a slow pathway with a longer AH interval and a shorter ERP. During tachycardia, electrophysiologic signals will reveal conduction up the midline. Introduction of premature ventricular contractions and measurement of the HA interval during SVT can help distinguish AVNRT from a SVT utilizing an accessory pathway. Radiofrequency catheter ablation (RFA) has been used increasingly in children as treatment for AVNRT. The initial approach to RFA of AVNRT was modification of AV fast pathway conduction by lesions placed near the anterosuperior aspect of the triangle of Koch, known as the anterior approach method. However, this technique was associated with a significant risk of complete AV block. Now, the posterior approach slow pathway modification is used more commonly, which positions the ablation catheter along the tricuspid annulus immediately anterior to the coronary sinus ostium. This has been associated with a lower risk of complete AV block. Using this technique, RFA should be considered the method of choice for curative therapy of AVNRT in pediatric patients.

18.
Med Anthropol Q ; 14(3): 346-73, 2000 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-11036583

RESUMO

This essay describes the use of the Diagnostic and Statistical Manual of Psychiatry in the prison setting. The distinction between the Axis I disorders (major mental illness) and those designated Axis II (character disorders) is explored in terms of the professional division of labor in prison and the problems posed for prison discipline by "behaviorally disturbed" inmates. Conflicts over diagnosis are placed in ethnographic and historical perspective and form the basis for a discussion of the problematic relationship between disciplinary space and issues of subjection and agency.


Assuntos
Serviços de Saúde Mental , Transtornos do Humor/classificação , Transtornos da Personalidade/classificação , Prisioneiros/psicologia , Esquizofrenia/classificação , Sociologia Médica , Humanos , Prática Institucional , Transtornos Mentais/classificação , Prisões/organização & administração , Relações Profissional-Paciente , Psiquiatria , Estados Unidos , Washington
19.
J Fam Pract ; 50(9): 762-6, 2001 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-11674908

RESUMO

OBJECTIVES: The American health care system is complicated and can be difficult to navigate. The physician who observes the care of a family member has a uniquely informed perspective on this system. We hoped to gain insight into some of the shortcomings of the health care system from the personal experiences of physician family members. STUDY DESIGN: Using a key informant technique, we invited by E-mail any of the chairpersons of US academic departments of family medicine to describe their recent personal experiences with the health care system when their parent was seriously ill. In-depth semi-structured telephone interviews were conducted with each of the study participants. The interviews were transcribed, coded, and labeled for themes. POPULATION: Eight family physicians responded to the E-mail, and each was interviewed. These physicians had been in practice for an average of 19 years, were nationally distributed, and included both men and women. Each discussed their father's experience. RESULTS: All participants spoke of the importance of an advocate for their fathers who would coordinate medical care. These physicians witnessed various obstacles in their fathers's care, such as poor communication and fragmented care. As a result, many of them felt compelled to intervene in their fathers' care. The physicians expressed concern about the care their fathers received, believing that the system does not operate the way it should. CONCLUSIONS: Even patients with a knowledgeable physician family member face challenges in receiving optimal medical care. Patients might receive better care if health care systems reinforced the role of an accountable attending physician, encouraged continuity of care, and emphasized the value of knowing the patient as a person.


Assuntos
Medicina de Família e Comunidade , Família , Papel do Médico , Qualidade da Assistência à Saúde , Humanos , Masculino
20.
J Fam Pract ; 46(1): 73-82, 1998 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-9451373

RESUMO

BACKGROUND: Primary care physicians are often held to the same standard of performance as mental health specialists, yet they face special challenges in recognizing and treating depression. The purpose of this study was to explore the range of approaches to diagnose depression. METHODS: A purposeful sample of 21 primary care physicians in three US cities participated. A semistructured series of questions and clinical cases stimulated discussions about recognizing and managing major and minor depression. The focus groups were videotaped, and data were analyzed by two independent reviewers using the classic method of content analysis. RESULTS: Primary care providers have three major ways of approaching the diagnosis of depression: a biomedical exclusionary approach, where investigation of all physical complaints occurs first; a mental health approach, where psychosocial aspects of a presentation are pursued first; and a synergistic approach, where physical and mental health complaints are addressed simultaneously. Physicians move freely across all approaches depending on patient cues. CONCLUSIONS: Physicians' approaches to depression vary depending on patient characteristics and cues. Through a better understanding of current practices, future researchers can identify the optimal clinical approaches to match the characteristics and cues of specific patients. This study informed the development of a larger objective study of primary care physician performance.


Assuntos
Atitude do Pessoal de Saúde , Transtorno Depressivo/diagnóstico , Médicos/psicologia , Padrões de Prática Médica , Adulto , Idoso , Transtorno Depressivo/psicologia , Medicina de Família e Comunidade , Feminino , Grupos Focais , Humanos , Medicina Interna , Masculino , Pessoa de Meia-Idade , Estados Unidos
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