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1.
Anaesthesist ; 70(4): 291-297, 2021 Apr.
Artículo en Alemán | MEDLINE | ID: mdl-33231715

RESUMEN

BACKGROUND: The infraclavicular puncture of the subclavian vein is a standard procedure for anesthetists. Meanwhile the literature and recommendations are clear and the use of real-time ultrasound guidance is the standard procedure; however, anesthetists will always get into special circumstances were they have to use the landmark technique, so this competence must be preserved. Feared complications of infraclavicular subclavian vein puncture are pneumothorax and arterial puncture. Up to now there is no clear learning curve for the infraclavicular subclavian vein puncture in the landmark technique performed by anesthetists. OBJECTIVE: The aim of this study was to examine the influence of the puncture experience on the success rate and mechanical complications, such as pneumothorax and arterial puncture in patients who received an infraclavicular subclavian vein puncture with the landmark technique. Three levels of experience were defined for comparison: inexperienced 0-20 punctures, moderately experienced 21-50 and experienced over 50 punctures. MATERIAL AND METHODS: Post hoc analysis of a previously published noninferiority study to examine the influence of ventilation on the pneumothorax rate in the subclavian vein puncture using the landmark technique. This analysis included 1021 anesthetized patients who were included in the original study between August 2014 and October 2017. Demographic data as well as the number of puncture attempts, puncture success, the overall rate of mechanical complications, pneumothorax rate and arterial puncture rates were calculated. RESULTS: The overall rate of mechanical complications (pneumothorax + arterial puncture) was significantly higher in the inexperienced group (0-21) compared to the experienced group (>50, 15% vs. 8.5%, respectively, p = 0.023). This resulted in an odds ratio of 0.52 (confidence interval, CI: 0.32-0.85, p = 0.027). Likewise, the rate of puncture attempts in the group of inexperienced (0-20) with 1.85 ± 1.12 was significantly higher than in the group of experienced (>50, 1.58 ± 0.99, p = 0.004) and resulted in an odds ratio of 0.59 (CI: 0.31-0.96, p = 0.028). Although the puncture attempts of the moderately experienced (21-50) compared to the inexperienced (0-20) was not significant lower, we found an odds ratio of 0.69 (CI: 0.48-0.99, p = 0.042). The rate of successful puncture was 95.1% in the experienced group versus 89.3% in the inexperienced group (p = 0.001), which resulted in an odds ratio of 2.35 (CI: 1.28-4.31, p = 0.018). When viewed individually, no significant differences were found for pneumothorax and arterial puncture. CONCLUSION: In this post hoc analysis of the puncture of the subclavian vein using the landmark technique, we found a significant reduction of puncture attempts and overall mechanical complications. At least 50 punctures seem to be necessary to achieve the end of the learning curve; however, the landmark technique should only be used under special circumstances, when real-time ultrasound is not available. Anesthetists who want to complete their repertoire and learn the landmark technique should always perform a static ultrasound examination before starting the puncture in order to reduce complications due to anatomical variations or thrombosis.


Asunto(s)
Cateterismo Venoso Central , Neumotórax , Cateterismo Venoso Central/efectos adversos , Humanos , Neumotórax/epidemiología , Neumotórax/etiología , Punciones/efectos adversos , Vena Subclavia/diagnóstico por imagen , Ultrasonografía , Ultrasonografía Intervencional
2.
Acta Neurochir (Wien) ; 159(2): 339-346, 2017 02.
Artículo en Inglés | MEDLINE | ID: mdl-27896454

RESUMEN

BACKGROUND: There is an ongoing debate about the sitting position (SP) in neurosurgical patients. The SP provides a number of advantages as well as severe complications such as commonly concerning venous air embolism (VAE). The best monitoring system for the detection of VAE is still controversial. METHODS: In this retrospective analysis we compared 208 patients. Transesophageal echocardiography (TEE) or transthoracic Doppler (TTD) were used as monitoring devices to detect VAE; 101 cases were monitored with TEE and 107 with TTD. RESULTS: The overall incidence of VAE was 23% (TTD: 10%; TEE: 37%), but the incidence of clinically relevant VAE (drop in end-tidal carbon dioxide above 3 mmHg) was higher in the TTD group (9 out of 17 VAE, 53%) compared to the TEE group (19 out of 62 VAE, 31%). None of the patients with recorded VAE had clinically significant sequelae. CONCLUSIONS: In this small sample we found more VAE events in the TEE group, but the incidence of clinically relevant VAE was rare and comparable to other data. There is no consensus in the definition of clinically relevant VAE.


Asunto(s)
Craneotomía/efectos adversos , Embolia Aérea/etiología , Posicionamiento del Paciente/efectos adversos , Adulto , Anciano , Venas Cerebrales/patología , Venas Cerebrales/cirugía , Craneotomía/métodos , Ecocardiografía Transesofágica/métodos , Embolia Aérea/epidemiología , Femenino , Humanos , Incidencia , Masculino , Persona de Mediana Edad , Monitoreo Fisiológico/métodos , Posicionamiento del Paciente/métodos
4.
J Neurosurg Sci ; 2022 Apr 05.
Artículo en Inglés | MEDLINE | ID: mdl-35380206

RESUMEN

BACKGROUND: Mannitol is used in the treatment of raised intracranial pressure (ICP). The aim of this study was to investigate whether mannitol (MAN) leads to a relevant deterioration in platelet function in routine neurosurgical procedures. METHODS: Thirty-eight patients undergoing elective craniotomy due to a brain tumor with elevated ICP were included. After induction of anaesthesia a blood sample was taken (T1). The patients then received 1 g-kg-1 MAN within 30 minutes. The second blood sample (T2) was obtained 60 minutes after T1. Blood samples were examined by means of aggregometry (Multiplate®) and PFA-100® tests. RESULTS: No patient had clinical signs of increased bleeding. We could not find any deterioration in the aggregometry using Multiplate®, neither in the adenosinediphosphate (ADP), the arachidonic acid (ASPI), or the thrombin receptor activating protein (TRAP) test. PFA-100® closing times (cT) showed a significant prolongation between T1 and T2: collagen/adenosindiphosphate (COL/ADP) test 79s [70/99] and 91s [81/109]; p=0.002); collagen/epinephrine (COL/EPI) test 109s [92/129] and 122s [94/159]; p=0.0004). A subgroup analysis showed that the patients who received isotonic balanced infusions only, had no prolongation of cT, whereas the patients who received additionally gelatine solution had a significant prolongation. COL/ADP: 78s [70/98] and 91s [82/133]; p=0.0004). COL/EPI: test 111s [92/128] and 127s [103/146]; p=0.0026). Except for individual outliers, the measured values were in the normal range. CONCLUSIONS: In this study, we found no clinically relevant deterioration of platelet function in neurosurgical patients with increased ICP after administration of MAN. Changes that occurred were all within normal ranges.

5.
J Vasc Access ; 23(3): 348-352, 2022 May.
Artículo en Inglés | MEDLINE | ID: mdl-33541202

RESUMEN

BACKGROUND: Pandemics create challenges for medical centers, which call for innovative adaptations to care for patients during the unusually high census, to distribute stress and work hours among providers, to reduce the likelihood of transmission to health care workers, and to maximize resource utilization. METHODS: We describe a multidisciplinary vascular access team's development to improve frontline providers' workflow by placing central venous and arterial catheters. Herein we describe the development, organization, and processes resulting in the rapid formation and deployment of this team, reporting on notable clinical issues encountered, which might serve as a basis for future quality improvement and investigation. We describe a retrospective, single-center descriptive study in a large, quaternary academic medical center in a major city. The COVID-19 vascular access team included physicians with specialized experience in placing invasive catheters and whose usual clinical schedule had been lessened through deferment of elective cases. The target population included patients with confirmed or suspected COVID-19 in the medical ICU (MICU) needing invasive catheter placement. The line team placed all invasive catheters on patients in the MICU with suspected or confirmed COVID-19. RESULTS AND CONCLUSIONS: Primary data collected were the number and type of catheters placed, time of team member exposure to potentially infected patients, and any complications over the first three weeks. Secondary outcomes pertained to workflow enhancement and quality improvement. 145 invasive catheters were placed on 67 patients. Of these 67 patients, 90% received arterial catheters, 64% central venous catheters, and 25% hemodialysis catheters. None of the central venous catheterizations or hemodialysis catheters were associated with early complications. Arterial line malfunction due to thrombosis was the most frequent complication. Division of labor through specialized expert procedural teams is feasible during a pandemic and offloads frontline providers while potentially conferring safety benefits.


Asunto(s)
COVID-19 , Cateterismo Venoso Central , Catéteres Venosos Centrales , Cateterismo Venoso Central/efectos adversos , Cateterismo Venoso Central/métodos , Enfermedad Crítica , Humanos , Pandemias , Estudios Retrospectivos
6.
Phys Chem Chem Phys ; 13(35): 15803-9, 2011 Sep 21.
Artículo en Inglés | MEDLINE | ID: mdl-21808801

RESUMEN

We have studied how the formation of molecular hydrogen on silicates at low temperature is influenced by surface morphology. At low temperature (<30 K), the formation of molecular hydrogen occurs chiefly through weak physical adsorption processes. Morphology then plays a role in facilitating or hindering the formation of molecular hydrogen. We studied the formation of molecular hydrogen on a single crystal forsterite and on thin films of amorphous silicate of general composition (Fe(x)Mg((x-1)))(2)SiO(4), 0 < x < 1. The samples were studied ex situ by Atom Force Microscopy (AFM), and in situ using Thermal Programmed Desorption (TPD). The data were analysed using a rate equation model. The main outcome of the experiments is that TPD features of HD desorbing from an amorphous silicate after its formation are much wider than the ones from a single crystal; correspondingly typical energy barriers for diffusion and desorption of H, H(2) are larger as well. The results of our model can be used in chemical evolution codes of space environments, where both amorphous and crystalline silicates have been detected.

7.
Ann Card Anaesth ; 24(3): 281-287, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34269255

RESUMEN

Objective: In this study we compared noninvasive arterial pressure measurement using ClearSight™ vascular-unloading-technique (Edwards Lifesciences Corp, Irvine, CA) with invasive arterial pressure measurement during induction of anesthesia undergoing mayor cardiac surgery. Design: Prospective, monocentric. Setting: University hospital. Participants: 54 patients undergoing mayor cardiac surgery. Interventions: During induction all patients were simultaneously monitored with invasive (reference method) and noninvasive arterial pressure measurement (test-method) over a mean time period of 27 minutes. Measurements and Main Results: We observed slightly lower systolic and mean arterial pressures noninvasive than invasive. For systolic arterial pressure the mean of the differences was -18,05 mmHg (p < 0,05, SD ±16,78 mmHg), the mean arterial pressure MAP -5,47 mmHg (p < 0,05, SD ±11,08 mmHg) and for diastolic pressure -1,09 mmHg (p < 0,05, SD±11,15 mmHg),. The mean of the differences in heartrate was 1,15 (p < 0,05, SD±6,9 mmHg). When considering all measured values of the invasively measured MAP and the ClearSight ™ -MAP at the same timestamp over the recording interval, an almost identical progress can be seen that indicates a sufficient mapping of the hemodynamic changes. The percentage error for mean arterial, systolic and diastolic pressure measured by ClearSight™ amounts to 25,95 %, 26,77 % and 34,16 %, respectively. Conclusions: We conclude that ClearSight ™ is a good option for hemodynamic monitoring during induction of anesthesia. Taking into account the limitations, non-invasive arterial blood pressure measurement offers sufficient security to safely initiate anesthesia, especially when MAP is of particular interest. The use of non-invasive arterial blood pressure measurement with ClearSight ™ during induction of anesthesia in patients scheduled for major cardiac surgery is reliable and easy to use.


Asunto(s)
Presión Arterial , Procedimientos Quirúrgicos Cardíacos , Anestesia General , Presión Sanguínea , Determinación de la Presión Sanguínea , Humanos , Estudios Prospectivos
8.
J Cardiothorac Surg ; 15(1): 255, 2020 Sep 14.
Artículo en Inglés | MEDLINE | ID: mdl-32928262

RESUMEN

BACKGROUND: The management of an incidental patent foramen ovale found during planned cardiac surgery remains a challenge, and current guidelines are not helpful. Although evidence is accumulating, that closure of an incidental found patent foramen ovale might be beneficial, especially in planned off-pump procedures, the diagnosis of a formerly unknown patent foramen ovale with the patient on the operation table has vast consequences by making it necessary to switch to on pump, bi-caval cannulation for patent foramen ovale closure. We therefore developed a technique for transatrial closure of a patent foramen ovale, guided by transesophageal echocardiography. RESULTS: We have performed this surgery in 9 patients. None of them had a previously diagnosed patent foramen ovale. Mean age was 74 (±5) years, Operation time was 175 min (± 34 min), Clamp time 35 min (± 16 min) and Cardiopulmonary bypass time 80 (±17 min). Mortality was 0%. Periprocedural transesophageal echocardiography revealed closure of the patent foramen ovale in all cases. CONCLUSION: We report a new surgical method for transoesophageal echocardiography controlled closure of a patent foramen ovale without the need for an atriotomy. This new technique is especially useful for the closure of patent foramen ovale in the setting of on-pump and off-pump coronary artery bypass graft surgeries alike.


Asunto(s)
Estenosis de la Válvula Aórtica/cirugía , Foramen Oval Permeable/cirugía , Atrios Cardíacos , Anciano , Estenosis de la Válvula Aórtica/complicaciones , Estenosis de la Válvula Aórtica/diagnóstico por imagen , Cateterismo Cardíaco , Puente de Arteria Coronaria Off-Pump , Ecocardiografía Transesofágica , Femenino , Foramen Oval Permeable/complicaciones , Foramen Oval Permeable/diagnóstico por imagen , Implantación de Prótesis de Válvulas Cardíacas , Humanos , Masculino
9.
Vet Surg ; 38(4): 434-8, 2009 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-19538662

RESUMEN

OBJECTIVES: To evaluate laryngeal function using 3 diagnostic techniques: echolaryngography (EL), transnasal laryngoscopy (TNL), and laryngoscopy per os (LPO). STUDY DESIGN: Prospective clinical study. ANIMALS: Dogs with laryngeal paralysis (n=5) and control dogs (n=10); 5 age- and breed-matched dogs and 5 young, breed-matched dogs. METHODS: Laryngeal function was evaluated in conscious dogs using EL. All examinations were recorded and evaluated by separate, blinded observers upon completion of the study. The methods were compared with a standard evaluation incorporating all clinical knowledge of the case (STD) using sensitivity, specificity, positive, and negative predictive values. RESULTS: Three dogs with bilateral laryngeal paralysis requiring surgery were diagnosed as unilaterally affected or normal on EL. Three dogs had paradoxic motion on TNL and LPO, 2 of those were considered normal on EL, and 1 had no motion on EL. Paralysis was diagnosed in 1 age-matched and 3 young control dogs on EL. LPO and TNL falsely diagnosed lack of arytenoid movement in 2 age-matched controls and 1 young control. Two age-matched and 1 young control dog were misdiagnosed as paralyzed with TNL and LPO. DISCUSSION: Direct observation of the larynx allowed better evaluation of laryngeal function compared with EL. TNL did not require induction of anesthesia, but did not improve the ability to assess laryngeal function compared with LPO. CONCLUSIONS: EL was not as effective as direct observation of the larynx. TNL did not improve the evaluation of laryngeal function compared with LPO. CLINICAL RELEVANCE: We use LPO combined with knowledge of the clinical history and physical examination to diagnose laryngeal paralysis in preference to EL and TNL.


Asunto(s)
Enfermedades de los Perros/diagnóstico , Laringoscopía/veterinaria , Ultrasonografía/veterinaria , Parálisis de los Pliegues Vocales/veterinaria , Animales , Estudios de Casos y Controles , Perros , Laringoscopía/métodos , Sensibilidad y Especificidad , Parálisis de los Pliegues Vocales/diagnóstico
10.
Turk J Anaesthesiol Reanim ; 47(3): 199-205, 2019 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-31183466

RESUMEN

OBJECTIVE: Mannitol 20% and succinylated gelatin 4% are routinely used in neurosurgical procedures. The aim of this in vitro study was to explore the influence of both agents on blood coagulation and platelet function. METHODS: Blood from 21 healthy volunteers was obtained and then diluted so as to form five groups: (1) 7% dilution with mannitol; (2) 10% dilution with gelatin; (3) 17% dilution with isotonic balanced electrolyte solution; (4) 17% dilution with mannitol+gelatin; and (5) undiluted blood. The extrinsic thrombelastometry (EXTEM) and fibrin thrombelastometry (FIBTEM) tests were examined by rotational thrombelastometry via ROTEM®, and thrombocyte aggregometry with the aspirin inhibiting- (ASPI), adenosine diphosphate- (ADP), and thrombin-activating protein (TRAP) tests performed by Multiplate. RESULTS: In the EXTEM test clot formation time, the alpha angle, and maximum clot firmness were significantly reduced by mannitol and the combination of mannitol with gelatin. The platelet function tested in the ADP test was also significantly reduced with this combination. CONCLUSION: In this in vitro study, clinically relevant dilutions of mannitol and gelatin showed a significant inhibition of whole blood coagulation and the platelet function, which could be detrimental in neurosurgical settings.

11.
J Am Vet Med Assoc ; 233(4): 590-6, 2008 Aug 15.
Artículo en Inglés | MEDLINE | ID: mdl-18710314

RESUMEN

OBJECTIVE: To describe the ultrasonographic appearance of the coelomic cavity in healthy green iguanas. DESIGN: Cross-sectional study. ANIMALS: 26 healthy green iguanas (20 males and 6 females). PROCEDURES: For coelomic ultrasonography, animals were physically restrained in dorsal recumbency by an assistant; chemical restraint was not used. Qualitative and quantitative observations were recorded. RESULTS: Structures that could be visualized in all animals included the heart and cardiac chambers; liver; caudal vena cava; hepatic veins; portal vein; gallbladder; pyloric portion of the stomach; and, when distended, urinary bladder. Visualization of the kidneys was poor. The spleen could be identified in 17 animals, and the gonads could be identified in 22, but were most easily identified in males evaluated during November (ie, during the breeding season); no females were evaluated during the breeding season. Physiologic enlargement of the testes yielded an acoustic window for the spleen by displacing overlying intestine. Anechoic, free coelomic fluid was identified in 3 animals. Measurements of overall cardiac size, ventricular wall thickness, gallbladder size, thickness of the pyloric portion of the stomach, and splenic size were obtained. Only ventricular wall thickness was significantly correlated with body weight. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggested that ultrasonography allowed examination of most coelomic structures in green iguanas. The procedure was easily performed and was well tolerated in conscious animals.


Asunto(s)
Cavidad Abdominal/diagnóstico por imagen , Iguanas/anatomía & histología , Ultrasonografía/veterinaria , Animales , Estudios Transversales , Ecocardiografía/veterinaria , Femenino , Corazón/anatomía & histología , Hígado/anatomía & histología , Hígado/diagnóstico por imagen , Masculino , Valores de Referencia , Estaciones del Año , Bazo/anatomía & histología , Bazo/diagnóstico por imagen , Ultrasonografía/métodos , Sistema Urinario/anatomía & histología , Sistema Urinario/diagnóstico por imagen
12.
J Am Vet Med Assoc ; 230(6): 868-72, 2007 Mar 15.
Artículo en Inglés | MEDLINE | ID: mdl-17362161

RESUMEN

CASE DESCRIPTION: A 1-year-old sexually intact female Netherland dwarf rabbit was examined because of a 3-week history of signs of lethargy, decreased appetite, left unilateral exophthalmia, a previous draining sinus from a left maxillary facial abscess, and bilateral nasal discharge. CLINICAL FINDINGS: The rabbit weighed 1.0 kg (2.2 lb) and had a body condition score of 1.5/5. Physical examination revealed generalized muscle atrophy, bilateral mucopurulent nasal discharge, and severe left-sided exophthalmia. Diagnostic investigation revealed anemia, neutrophilia, severe dental disease, a superficial corneal ulcer of the left eye, and a retrobulbar abscess. TREATMENT AND OUTCOME: Stomatoscopy-aided dental trimming, tooth removal, and abscess debridement were performed. Antimicrobials were flushed into the tooth abscess cavity, and antimicrobial treatment was initiated on the basis of cytologic findings and results of bacterial culture and susceptibility testing. Two months after the initial surgery, minimal exophthalmia was evident and no further physical, radiographic, or ultrasonographic changes were evident. CLINICAL RELEVANCE: Stomatoscopy is a valuable technique that can facilitate diagnosis, treatment, and serial reevaluation of rabbits with dental disease.


Asunto(s)
Antibacterianos/uso terapéutico , Absceso Periapical/veterinaria , Conejos , Animales , Desbridamiento/veterinaria , Femenino , Pruebas de Sensibilidad Microbiana/veterinaria , Absceso Periapical/tratamiento farmacológico , Absceso Periapical/microbiología , Absceso Periapical/cirugía , Resultado del Tratamiento
14.
PLoS One ; 11(6): e0157349, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27304988

RESUMEN

BACKGROUND: Apnea of Prematurity (AOP) is common, affecting the majority of infants born at <34 weeks gestational age. Apnea and periodic breathing are accompanied by intermittent hypoxia (IH). Animal and human studies demonstrate that IH exposure contributes to multiple pathologies, including retinopathy of prematurity (ROP), injury to sympathetic ganglia regulating cardiovascular action, impaired pancreatic islet cell and bone development, cerebellar injury, and neurodevelopmental disabilities. Current standard of care for AOP/IH includes prone positioning, positive pressure ventilation, and methylxanthine therapy; these interventions are inadequate, and not optimal for early development. OBJECTIVE: The objective is to support breathing in premature infants by using a simple, non-invasive vibratory device placed over limb proprioceptor fibers, an intervention using the principle that limb movements trigger reflexive facilitation of breathing. METHODS: Premature infants (23-34 wks gestational age), with clinical evidence of AOP/IH episodes were enrolled 1 week after birth. Caffeine treatment was not a reason for exclusion. Small vibration devices were placed on one hand and one foot and activated in 6 hour ON/OFF sequences for a total of 24 hours. Heart rate, respiratory rate, oxygen saturation (SpO2), and breathing pauses were continuously collected. RESULTS: Fewer respiratory pauses occurred during vibration periods, relative to baseline (p<0.005). Significantly fewer SpO2 declines occurred with vibration (p<0.05), relative to control periods. Significantly fewer bradycardic events occurred during vibration periods, relative to no vibration periods (p<0.05). CONCLUSIONS: In premature neonates, limb proprioceptive stimulation, simulating limb movement, reduces breathing pauses and IH episodes, and lowers the number of bradycardic events that accompany aberrant breathing episodes. This low-cost neuromodulatory procedure has the potential to provide a non-invasive intervention to reduce apnea, bradycardia and intermittent hypoxia in premature neonates. TRIAL REGISTRATION: ClinicalTrials.gov NCT02641249.


Asunto(s)
Apnea/terapia , Bradicardia/terapia , Hipoxia/terapia , Enfermedades del Prematuro/terapia , Ventilación con Presión Positiva Intermitente/métodos , Vías Aferentes/fisiología , Apnea/fisiopatología , Peso al Nacer , Bradicardia/fisiopatología , Extremidades/inervación , Femenino , Edad Gestacional , Humanos , Hipoxia/fisiopatología , Recién Nacido , Recien Nacido Prematuro , Enfermedades del Prematuro/fisiopatología , Masculino , Proyectos Piloto , Propiocepción/fisiología , Respiración , Resultado del Tratamiento
15.
Circ Arrhythm Electrophysiol ; 8(3): 554-61, 2015 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-25873718

RESUMEN

BACKGROUND: New approaches to ablation of atrial fibrillation (AF) include focal impulse and rotor modulation (FIRM) mapping, and initial results reported with this technique have been favorable. We sought to independently evaluate the approach by analyzing quantitative characteristics of atrial electrograms used to identify rotors and describe acute procedural outcomes of FIRM-guided ablation. METHODS AND RESULTS: All FIRM-guided ablation procedures (n=24; 50% paroxysmal) at University of California, Los Angeles Medical Center were included for analysis. During AF, unipolar atrial electrograms collected from a 64-pole basket catheter were used to construct phase maps and identify putative AF sources. These sites were targeted for ablation, in conjunction with pulmonary vein isolation in most patients (n=19; 79%). All patients had rotors identified (mean, 2.3±0.9 per patient; 72% in left atrium). Prespecified acute procedural end point was achieved in 12 of 24 (50%) patients: AF termination (n=1), organization (n=3), or >10% slowing of AF cycle length (n=8). Basket electrodes were within 1 cm of 54% of left atrial surface area, and a mean of 31 electrodes per patient showed interpretable atrial electrograms. Offline analysis revealed no differences between rotor and distant sites in dominant frequency or Shannon entropy. Electroanatomic mapping showed no rotational activation at FIRM-identified rotor sites in 23 of 24 patients (96%). CONCLUSIONS: FIRM-identified rotor sites did not exhibit quantitative atrial electrogram characteristics expected from rotors and did not differ quantitatively from surrounding tissue. Catheter ablation at these sites, in conjunction with pulmonary vein isolation, resulted in AF termination or organization in a minority of patients (4/24; 17%). Further validation of this approach is necessary.


Asunto(s)
Fibrilación Atrial/diagnóstico , Técnicas Electrofisiológicas Cardíacas , Atrios Cardíacos/fisiopatología , Centros Médicos Académicos , Potenciales de Acción , Anciano , Fibrilación Atrial/fisiopatología , Fibrilación Atrial/cirugía , Ablación por Catéter , Femenino , Atrios Cardíacos/cirugía , Humanos , Los Angeles , Masculino , Persona de Mediana Edad , Valor Predictivo de las Pruebas , Venas Pulmonares/fisiopatología , Venas Pulmonares/cirugía , Estudios Retrospectivos , Factores de Tiempo , Resultado del Tratamiento
16.
J Drugs Dermatol ; 2(3): 250-3, 2003 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-12848108

RESUMEN

This article is an in-depth review of various materials and products that have been used for the augmentation of soft tissue in the past, and covers several new products, methods, and techniques that may provide new options for dermatologists who use fillers in their practice. Pros and cons of each are discussed, along with mechanisms of action, dosages, approved and off-label uses, as well as a look ahead at some prospective technology.


Asunto(s)
Técnicas Cosméticas/tendencias , Ácido Hialurónico/análogos & derivados , Ácido Hialurónico/administración & dosificación , Siliconas/administración & dosificación , Administración Cutánea , Animales , Ensayos Clínicos como Asunto/estadística & datos numéricos , Técnicas Cosméticas/normas , Humanos , Cirugía Plástica/métodos , Cirugía Plástica/tendencias
17.
Am Surg ; 80(10): 1003-6, 2014 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-25264648

RESUMEN

In accordance with the Affordable Care Act, Medicare has instituted financial penalties for hospitals with 30-day readmission rates that exceed a predetermined value. Currently, this value only considers "excess" readmissions for myocardial infarction, heart failure, and pneumonia with a maximum fine being one per cent of total Medicare reimbursements. In 2015, this penalty will increase to three per cent and encompass more surgical diagnoses. We retrospectively reviewed a database of adult patients undergoing cardiac surgery treated at our institution in 2012 to establish whether patients with readmissions within 30 days of the index operation could have been managed more cost-effectively without readmission. A calculation of cost efficiency was performed to compare the net hospital profit for two scenarios: admitting patients versus hypothetical preventative measures. Of the 576 patients during the study period, a total of 68 (11.8%) patients with unplanned 30-day readmissions were identified. Outpatient management was determined to have been feasible for 18 (26.5%) patients. Whereas the calculated net profit for readmission was $144,000, inclusion of Medicare's penalty resulted in a loss of $11,950. A readmission reduction program with an annual cost exceeding $11,950 would lead to financial loss. The financial implications of Medicare's readmission penalty alone necessitate the development of cost-effective strategies to reduce rehospitalization.


Asunto(s)
Atención Ambulatoria/economía , Procedimientos Quirúrgicos Cardíacos , Economía Hospitalaria , Medicare/economía , Readmisión del Paciente/economía , Rol del Médico , Cirujanos , Adulto , Anciano , Anciano de 80 o más Años , Análisis Costo-Beneficio , Bases de Datos Factuales , Femenino , Humanos , Los Angeles , Masculino , Medicare/legislación & jurisprudencia , Persona de Mediana Edad , Patient Protection and Affordable Care Act , Readmisión del Paciente/legislación & jurisprudencia , Proyectos Piloto , Estudios Retrospectivos , Estados Unidos
18.
JAMA Otolaryngol Head Neck Surg ; 140(7): 664-6, 2014 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-24875853

RESUMEN

IMPORTANCE: Benign granulomatous disease may mimic malignant disease in the evaluation of mediastinal or pulmonary lesions. However, histoplasmosis as a cause of cervical lymphadenopathy is relatively rare. We report the first case of Histoplasma infection mimicking malignant adenopathy discovered during diagnostic thyroid lobectomy. OBSERVATIONS: A 2.5-cm, calcified, right paratracheal lymph node intimately involving the recurrent laryngeal nerve was discovered during lobectomy for a follicular lesion of undetermined significance with a positive NRAS mutation. Although metastatic thyroid cancer was the most probable diagnosis, results of gross inspection of the bisected thyroid nodule suggested a benign process. Partial removal of the node, sparing the nerve, established the diagnosis of Histoplasma capsulatum infection. CONCLUSIONS AND RELEVANCE: Histoplasmosis is a rare cause of cervical adenopathy that should be considered in cases in which a discordance arises between the malignant gross appearance of the adenopathy and the benign gross appearance of an associated thyroid nodule.


Asunto(s)
Diagnóstico Diferencial , Histoplasmosis/diagnóstico , Enfermedades Linfáticas/diagnóstico , Nervio Laríngeo Recurrente , Tiroidectomía , Histoplasmosis/patología , Humanos , Periodo Intraoperatorio , Enfermedades Linfáticas/patología , Metástasis Linfática/diagnóstico , Metástasis Linfática/patología , Masculino , Persona de Mediana Edad , Nódulo Tiroideo/cirugía
19.
Stud Health Technol Inform ; 196: 378-83, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-24732540

RESUMEN

The aim of this paper is to model and visualize cardiovascular deformations in order to better understand vascular movements inside the lung and heart caused by abnormal cardiac conditions. The modeling was performed in two steps: first step involved modeling the cardiac output taking into account of the heart rate and preload blood volume, contractility and systematic vascular resistance. The second step involved deforming a 3D cine cardiac gated Magnetic Resonance Volume to the corresponding cardiac output. Cardiac-gated MR imaging of 4 healthy volunteers were acquired. For each volunteer, a total of 24 short-axis and 18 radial planar views were acquired on a 1.5 T MR scanner during a series of 12-15 second breath-hold maneuvers. A 3D multi-resolution optical flow deformable image registration algorithm was used to quantify the volumetric cardiovascular displacements for known cardiac outputs. Results show that a real-time visualization of the vascular deformations inside both the lung as well as the heart can be seen for different cardiac outputs representing normal and abnormal cardiac conditions.


Asunto(s)
Simulación por Computador , Corazón/fisiología , Hemodinámica/fisiología , Pulmón/fisiología , Modelos Cardiovasculares , Corazón/fisiopatología , Humanos , Pulmón/fisiopatología
20.
Appl Neuropsychol Adult ; 21(4): 241-59, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-25265306

RESUMEN

In neuropsychological decision-making research, several different tasks are used to measure decision-making competences in patients and healthy study participants. Unfortunately, the existing tasks are often inflexible for modification, use different scenarios, and include several gambling cues. Therefore, comparisons between participants' performances in different tasks are difficult. We developed the Truck Dispatcher Framework (TDF), in which different decision-making tasks can be designed within one unitary, flexible, and real-world-oriented story line. To test the story line, TDF analogues of three standard decision-making tasks (Game of Dice Task, Probability-Associated Gambling task, Iowa Gambling Task) were developed. In three studies with brain-healthy participants, the behavior in standard decision-making tasks and the TDF analogues of those tasks were compared. Similar behaviors indicate that the TDF tasks measure decision making appropriately. Thus, the TDF is recommended for experimental and clinical research because it allows for examining decision-making competences in tasks with different demands that take place within one unitary story line.


Asunto(s)
Toma de Decisiones/fisiología , Juicio/fisiología , Pruebas Neuropsicológicas , Transportes , Adolescente , Adulto , Anciano , Análisis de Varianza , Toma de Decisiones Asistida por Computador , Femenino , Juegos Experimentales , Humanos , Masculino , Persona de Mediana Edad , Probabilidad , Solución de Problemas , Reproducibilidad de los Resultados , Asunción de Riesgos , Transportes/economía , Adulto Joven
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