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1.
J Thorac Cardiovasc Surg ; 165(1): 134-143.e3, 2023 01.
Artículo en Inglés | MEDLINE | ID: mdl-33712236

RESUMEN

OBJECTIVE: We evaluated whether interhospital variation in mortality rates for coronary artery bypass grafting was driven by complications and failure to rescue. METHODS: An observational study was conducted among 83,747 patients undergoing isolated coronary artery bypass grafting between July 2011 and June 2017 across 90 hospitals. Failure to rescue was defined as operative mortality among patients developing complications. Complications included the Society of Thoracic Surgeons 5 major complications (stroke, surgical reexploration, deep sternal wound infection, renal failure, prolonged intubation) and a broader set of 19 overall complications. After creating terciles of hospital performance (based on observed:expected mortality), each tercile was compared on the basis of crude rates of (1) major and overall complications, (2) operative mortality, and (3) failure to rescue (among major and overall complications). The correlation between hospital observed and expected (to address confounding) failure to rescue rates was assessed. RESULTS: Median Society of Thoracic Surgeons predicted mortality risk was similar across hospital observed:expected mortality terciles (P = .831). Mortality rates significantly increased across terciles (low tercile: 1.4%, high tercile: 2.8%). Although small in magnitude, rates of major (low tercile: 11.1%, high tercile: 12.2%) and overall (low tercile: 36.6%, high tercile: 35.3%) complications significantly differed across terciles. Nonetheless, failure to rescue rates increased substantially across terciles among patients with major (low tercile: 9.1%, high tercile: 14.3%) and overall (low tercile: 3.3%, high tercile: 6.8%) complications. Hospital observed and expected failure to rescue rates were positively correlated among patients with major (R2 = 0.14) and overall (R2 = 0.51) complications. CONCLUSIONS: The reported interhospital variability in successful rescue after coronary artery bypass grafting supports the importance of identifying best practices at high-performing hospitals, including early recognition and management of complications.


Asunto(s)
Puente de Arteria Coronaria , Hospitales , Humanos , Mortalidad Hospitalaria , Puente de Arteria Coronaria/efectos adversos , Selección de Paciente , Complicaciones Posoperatorias/cirugía , Complicaciones Posoperatorias/etiología , Factores de Riesgo
2.
Swiss J Geosci ; 115(1): 22, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36397963

RESUMEN

The Gotthard Base Tunnel (GBT) is a 57 km long railway tunnel, constructed in the Central Alps in Switzerland and extending mainly North-South across numerous geological units. We acquired 80 new gravity data points at the surface along the GBT profile and used 77 gravity measurements in the tunnel to test and constrain the shallow crustal, km-scale geological model established during the tunnel construction. To this end, we developed a novel processing scheme, which computes a fully 3D, density-dependent gravity terrain-adaptation correction (TAC), to consistently compare the gravity observations with the 2D geological model structure; the latter converted into a density model. This approach allowed to explore and quantify candidate rock density distributions along the GBT modelled profile in a computationally-efficient manner, and to test whether a reasonable fit can be found without structural modification of the geological model. The tested density data for the various lithologies were compiled from the SAPHYR rock physical property database. The tested models were evaluated both in terms of misfit between observed and synthetic gravity data, and also in terms of correlation between misfit trend and topography of the target profile. The results indicate that the locally sampled densities provide a better fit to the data for the considered lithologies, rather than density data averaged over a wider set of Alpine rock samples for the same lithology. Furthermore, using one homogeneous and constant density value for all the topographic corrections does not provide an optimal fit to the data, which instead confirms density variations along the profile. Structurally, a satisfactory fit could be found without modifying the 2D geological model, which thus can be considered gravimetry-proof. From a more general perspective, the gravity data processing routines and the density-dependent corrections developed in this case study represent a remarkable potential for further high-resolution gravity investigations of geological structures. Supplementary Information: The online version contains supplementary material available at 10.1186/s00015-022-00422-z.

3.
Proc (Bayl Univ Med Cent) ; 34(1): 215-220, 2020 Sep 14.
Artículo en Inglés | MEDLINE | ID: mdl-33456201

RESUMEN

The high-quality cardiothoracic surgery program is primed for mindful effective surgery. The challenge lies in attaining mindful skills and efficiency. Herein is one journey toward high departmental quality over two decades.

5.
Clin Transl Oncol ; 21(6): 735-744, 2019 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-30430394

RESUMEN

PURPOSE: To evaluate the prognostic factors associated with survival in patients treated with neoadjuvant treatment [chemoradiotherapy (CRT) or chemotherapy] followed by surgery (CRTS) in patients with stage IIIA-N2 non-small cell lung cancer (NSCLC). METHODS: A retrospective study was conducted of 118 patients diagnosed with stage T1-T3N2M0 NSCLC and treated with CRTS at 14 hospitals in Spain between January 2005 and December 2014. Overall survival (OS) and progression-free survival (PFS) were estimated using the Kaplan-Meier method and compared using the log-rank test. Cox regression analysis was performed. RESULTS: Surgery consisted of lobectomy (74.5% of cases), pneumectomy (17.8%), or bilobectomy (7.6%). Neoadjuvant treatment was CRT in 62 patients (52.5%) and chemotherapy alone in 56 patients (47.5%). Median follow-up was 42.5 months (5-128 months). 5-year OS and PFS were 51.1% and 49.4%, respectively. The following variables were independently associated with worse OS and PFS: pneumonectomy (vs. lobectomy); advanced pathologic T stage (pT3 vs. pT0-pT2); and presence of persistent N2 disease (vs. ypN0-1) in the surgical specimen. CONCLUSIONS: In this sample of patients with stage IIIA-N2 NSCLC treated with CRTS, 5-year survival (both OS and PFS) was approximately 50%. After CRTS, the patients with the best prognosis were those whose primary tumour and/or mediastinal nodal metastases were downstaged after induction therapy and those who underwent lobectomy. These findings provide further support for neoadjuvant therapy followed by surgery in selected patients.


Asunto(s)
Carcinoma de Pulmón de Células no Pequeñas/patología , Quimioradioterapia/mortalidad , Neoplasias Pulmonares/patología , Terapia Neoadyuvante/mortalidad , Neumonectomía/mortalidad , Adulto , Anciano , Carcinoma de Pulmón de Células no Pequeñas/terapia , Terapia Combinada , Femenino , Estudios de Seguimiento , Humanos , Neoplasias Pulmonares/terapia , Masculino , Persona de Mediana Edad , Estadificación de Neoplasias , Estudios Retrospectivos , España , Tasa de Supervivencia
7.
Lung Cancer ; 118: 119-127, 2018 04.
Artículo en Inglés | MEDLINE | ID: mdl-29571989

RESUMEN

OBJECTIVES: The role of surgery in stage IIIA-N2 non-small cell lung cancer (NSCLC) is an actively debated in oncology. To evaluate the value of surgery in this patient population, we conducted a multi-institutional retrospective study comparing neoadjuvant chemoradiotherapy or chemotherapy plus surgery (CRTS) to definitive chemoradiotherapy (dCRT). MATERIAL AND METHODS: A total of 247 patients with potentially resectable stage T1-T3N2M0 NSCLC treated with either CRTS or dCRT between January 2005 and December 2014 at 15 hospitals in Spain were identified. A centralized review was performed to ensure resectability. A propensity score matched analysis was carried out to balance patient and tumor characteristics (n = 78 per group). RESULTS: Of the 247 patients, 118 were treated with CRTS and 129 with dCRT. In the CRTS group, 62 patients (52.5%) received neoadjuvant CRT and 56 (47.4%) neoadjuvant chemotherapy. Surgery consisted of either lobectomy (97 patients; 82.2%) or pneumonectomy (21 patients; 17.8%). In the matched samples, median overall survival (OS; 56 vs 29 months, log-rank p = .002) and progression-free survival (PFS; 46 vs 15 months, log-rank p < 0.001) were significantly higher in the CRTS group. This survival advantage for CRTS was maintained in the subset comparison between the lobectomy subgroup versus dCRT (OS: 57 vs 29 months, p < 0.001; PFS: 46 vs 15 months, p < 0.001), but not in the comparison between the pneumonectomy subgroup and dCRT. CONCLUSION: The findings reported here indicate that neoadjuvant chemotherapy or chemoradiotherapy followed by surgery (preferably lobectomy) yields better OS and PFS than definitive chemoradiotherapy in patients with resectable stage IIIA-N2 NSCLC.


Asunto(s)
Carcinoma de Pulmón de Células no Pequeñas/tratamiento farmacológico , Quimioradioterapia , Neoplasias Pulmonares/tratamiento farmacológico , Terapia Neoadyuvante , Neumonectomía , Adulto , Anciano , Anciano de 80 o más Años , Carcinoma de Pulmón de Células no Pequeñas/mortalidad , Carcinoma de Pulmón de Células no Pequeñas/cirugía , Femenino , Estudios de Seguimiento , Humanos , Neoplasias Pulmonares/mortalidad , Neoplasias Pulmonares/cirugía , Masculino , Persona de Mediana Edad , Estadificación de Neoplasias , Estudios Retrospectivos , Análisis de Supervivencia
8.
Ann Thorac Surg ; 105(6): 1724-1730, 2018 06.
Artículo en Inglés | MEDLINE | ID: mdl-29408241

RESUMEN

BACKGROUND: Patients at high risk for having postprocedural complications may receive iodixanol, an iso-osmolar contrast, during coronary angiography to minimize the risk of renal toxicity. For those who also require cardiac surgery, the wait time between angiography and surgery may be a modifiable factor capable of mitigating poor surgical outcomes; however, there have been inconsistent reports regarding the optimal wait time. We sought to determine the effects of wait time between angiography and cardiac surgery, as well as contrast-induced acute kidney injury on the development of major adverse renal and cardiac events (MARCE). METHODS: We merged datasets to identify adults who underwent coronary angiography with iodixanol and subsequent cardiac surgery. RESULTS: Of 965 patients, 126 (13.1%) had contrast-induced acute kidney injury; 133 (13.8%) had MARCE within 30 days and 253 (26.2%) within 1 year of surgery. After adjusting for contrast-induced acute kidney injury, age, and Thakar acute renal failure score, the effect of wait time lost significance for the full cohort, but remained for the subgroup of 654 who had coronary artery bypass graft surgery. Patients undergoing coronary artery bypass graft surgery within 1 day of coronary angiography had an approximate twofold increase in risk of MARCE (30-day hazard ratio 2.13, 95% confidence interval: 1.16 to 3.88, p = 0.014; 1-year hazard ratio 2.07, 95% confidence interval: 1.32 to 3.23, p = 0.002) compared with patients who waited 5 or more days. CONCLUSIONS: Patients who had contrast-induced acute kidney injury and had cardiac surgery within 1 day of angiography had an increased risk of MARCE.


Asunto(s)
Lesión Renal Aguda/inducido químicamente , Medios de Contraste/efectos adversos , Angiografía Coronaria/efectos adversos , Puente de Arteria Coronaria/efectos adversos , Ácidos Triyodobenzoicos/efectos adversos , Lesión Renal Aguda/epidemiología , Lesión Renal Aguda/fisiopatología , Anciano , Procedimientos Quirúrgicos Cardíacos/efectos adversos , Procedimientos Quirúrgicos Cardíacos/métodos , Estudios de Cohortes , Intervalos de Confianza , Angiografía Coronaria/métodos , Puente de Arteria Coronaria/métodos , Femenino , Estudios de Seguimiento , Humanos , Incidencia , Masculino , Persona de Mediana Edad , Complicaciones Posoperatorias/epidemiología , Complicaciones Posoperatorias/fisiopatología , Modelos de Riesgos Proporcionales , Estudios Retrospectivos , Medición de Riesgo , Análisis de Supervivencia
9.
J Thorac Cardiovasc Surg ; 155(5): 2043-2047, 2018 05.
Artículo en Inglés | MEDLINE | ID: mdl-29329802

RESUMEN

OBJECTIVES: Readmission rates after cardiac surgery are being used as a quality indicator; they are also being collected by Medicare and are tied to reimbursement. Accurate knowledge of readmission rates may be difficult to achieve because patients may be readmitted to different hospitals. In our area, 81 hospitals share administrative claims data; 28 of these hospitals (from 5 different hospital systems) do cardiac surgery and share Society of Thoracic Surgeons (STS) clinical data. We used these 2 sources to compare the readmissions data for accuracy. METHODS: A total of 45,539 STS records from January 2008 to December 2016 were matched with the hospital billing data records. Using the index visit as the start date, the billing records were queried for any subsequent in-patient visits for that patient. The billing records included date of readmission and hospital of readmission data and were compared with the data captured in the STS record. RESULTS: We found 1153 (2.5%) patients who had STS records that were marked "No" or "missing," but there were billing records that showed a readmission. The reported STS readmission rate of 4796 (10.5%) underreported the readmission rate by 2.5 actual percentage points. The true rate should have been 13.0%. Actual readmission rate was 23.8% higher than reported by the clinical database. Approximately 36% of readmissions were to a hospital that was a part of a different hospital system. CONCLUSIONS: It is important to know accurate readmission rates for quality improvement processes and institutional financial planning. Matching patient records to an administrative database showed that the clinical database may fail to capture many readmissions. Combining data with an administrative database can enhance accuracy of reporting.


Asunto(s)
Reclamos Administrativos en el Cuidado de la Salud , Procedimientos Quirúrgicos Cardíacos/tendencias , Minería de Datos/métodos , Readmisión del Paciente/tendencias , Mejoramiento de la Calidad/tendencias , Indicadores de Calidad de la Atención de Salud/tendencias , Reclamos Administrativos en el Cuidado de la Salud/economía , Procedimientos Quirúrgicos Cardíacos/efectos adversos , Procedimientos Quirúrgicos Cardíacos/economía , Exactitud de los Datos , Bases de Datos Factuales , Precios de Hospital/tendencias , Costos de Hospital/tendencias , Humanos , Readmisión del Paciente/economía , Mejoramiento de la Calidad/economía , Indicadores de Calidad de la Atención de Salud/economía , Texas , Factores de Tiempo
10.
J Thorac Cardiovasc Surg ; 155(1): 172-179.e5, 2018 01.
Artículo en Inglés | MEDLINE | ID: mdl-28958597

RESUMEN

BACKGROUND: Despite many studies comparing on- versus off-pump coronary artery bypass graft (CABG), there is no consensus as to whether one of these techniques offers patients better outcomes. METHODS: We searched PubMed from inception to June 30, 2015, and identified additional studies from bibliographies of meta-analyses and reviews. We identified 42 randomized controlled trials (RCTs) and 31 rigorously adjusted observational studies (controlling for the Society of Thoracic Surgeons-recognized risk factors for mortality) reporting mortality for off-pump versus on-pump CABG at specified time points. Trial data were extracted independently by 2 researchers using a standardized form. Differences in probability of mortality (DPM) were estimated for the RCTs and observational studies separately and combined, for time points ranging from 30 days to 10 years. RESULTS: RCT-only data showed no significant differences at any time point, whereas observational-only data and the combined analysis showed short-term mortality favored off-pump CABG (n = 1.2 million patients; 36 RCTs, 26 observational studies; DPM [95% confidence interval (CI)], -44.8% [-45.4%, -43.8%]) but that at 5 years it was associated with significantly greater mortality (n = 60,405 patients; 3 RCTs, 5 observational studies; DPM [95% CI], 10.0% [5.0%, 15.0%]). At 10 years, only observational data were available, and off-pump CABG showed significantly greater mortality (DPM [95% CI], 14.0% [11.0%, 17.0%]). CONCLUSIONS: Evidence from RCTs showed no differences between the techniques, whereas rigorously adjusted observational studies (with >1.1 million patients) and the combined analysis indicated that off-pump CABG offers lower short-term mortality but poorer long-term survival. These results suggest that, in real-world settings, greater operative safety with off-pump CABG comes at the expense of lasting survival gains.


Asunto(s)
Puente de Arteria Coronaria Off-Pump , Puente de Arteria Coronaria Off-Pump/clasificación , Puente de Arteria Coronaria Off-Pump/métodos , Puente de Arteria Coronaria Off-Pump/mortalidad , Humanos , Factores de Riesgo , Análisis de Supervivencia , Resultado del Tratamiento
11.
Ann Thorac Surg ; 104(6): 1987-1993, 2017 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-28859926

RESUMEN

BACKGROUND: Risk-adjusted operative mortality is the most important quality metric in cardiac surgery for determining The Society of Thoracic Surgeons (STS) Composite Score for star ratings. Accurate 30-day status is required to determine STS operative mortality. The goal of this study was to determine the effect of unknown or missing 30-day status on risk-adjusted operative mortality in a regional STS Adult Cardiac Surgery Database cooperative and demonstrate the ability to correct these deficiencies by matching with an administrative database. METHODS: STS Adult Cardiac Surgery Database data were submitted by 27 hospitals from five hospital systems to the Texas Quality Initiative (TQI), a regional quality collaborative. TQI data were matched with a regional hospital claims database to resolve unknown 30-day status. The risk-adjusted operative mortality observed-to-expected (O/E) ratio was determined before and after matching to determine the effect of unknown status on the operative mortality O/E. RESULTS: TQI found an excessive (22%) unknown 30-day status for STS isolated coronary artery bypass grafting cases. Matching the TQI data to the administrative claims database reduced the unknowns to 7%. The STS process of imputing unknown 30-day status as alive underestimates the true operative mortality O/E (1.27 before vs 1.30 after match), while excluding unknowns overestimates the operative mortality O/E (1.57 before vs 1.37 after match) for isolated coronary artery bypass grafting. CONCLUSIONS: The current STS algorithm of imputing unknown 30-day status as alive and a strategy of excluding cases with unknown 30-day status both result in erroneous calculation of operative mortality and operative mortality O/E. However, external validation by matching with an administrative database can improve the accuracy of clinical databases such as the STS Adult Cardiac Surgery Database.


Asunto(s)
Procedimientos Quirúrgicos Cardíacos/mortalidad , Cardiopatías/cirugía , Complicaciones Posoperatorias/mortalidad , Medición de Riesgo , Adulto , Causas de Muerte/tendencias , Femenino , Estudios de Seguimiento , Cardiopatías/mortalidad , Humanos , Masculino , Reproducibilidad de los Resultados , Estudios Retrospectivos , Tasa de Supervivencia/tendencias , Factores de Tiempo , Estados Unidos/epidemiología
13.
Am J Cardiol ; 119(2): 323-327, 2017 Jan 15.
Artículo en Inglés | MEDLINE | ID: mdl-27839772

RESUMEN

Immediate surgery is standard therapy for acute type A aortic dissections (TAAD). Because of its low incidence, many smaller cardiac surgery programs do not routinely perform this procedure because it may negatively affect outcomes. Many high-risk, low-volume (LV) surgical procedures are now preferentially performed in reference centers. We compared the outcomes of surgery for TAAD in high-volume (HV) and LV centers in a single metropolitan area to determine the optimal setting for treatment. Thirty-five of the 37 cardiac surgery programs in the Dallas Ft. Worth metropolitan area participate in a regional consortium to measure outcomes collected in the Society of Thoracic Surgeons Adult Cardiac Database. From January 01, 2008, to December 31, 2014, 29 programs had treated TAAD. Those programs performing at least 100 operations for TAAD were considered HV centers and the others LV. Surgery for TAAD was performed in 672 patients over the 7-year study period with HV centers performing 469 of 672 (70%) of the operations. Despite similar preoperative characteristics, operative mortality was significantly lower in HV versus LV centers (14.1% vs 24.1%; p = 0.001). There was no significant difference in postoperative paralysis rates (2.6% vs 4.5%; p = 0.196), stroke rates (10.7% vs 9.4%; p = 0.623), or 30-day readmission rates (12.1% vs 15.5%; p = 0.292). An improved survival rate in HV centers was maintained over a 5-year follow-up period. Surgery for TAAD in a single large metropolitan area was most commonly performed in HV centers. In conclusion, the treatment of acute thoracic aortic dissection is recommended to be performed in reference centers because of lower early and midterm mortality.


Asunto(s)
Aneurisma de la Aorta Torácica/cirugía , Disección Aórtica/cirugía , Hospitales de Alto Volumen , Hospitales de Bajo Volumen , Complicaciones Posoperatorias/epidemiología , Enfermedad Aguda , Adulto , Anciano , Femenino , Hospitalización , Humanos , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Texas , Resultado del Tratamiento
14.
Andrology ; 4(6): 1073-1083, 2016 11.
Artículo en Inglés | MEDLINE | ID: mdl-27696749

RESUMEN

In human spermatozoa, protein kinases have a role in the acrosome reaction (AR) induced by a variety of stimuli. However, there is disagreement or a lack of information regarding the role of protein kinases and phosphatases in the progesterone (P)-induced increase in intracellular calcium concentration ([Ca2+ ]i ). In addition, there are no studies regarding the role of Ser/Thr and Tyr phosphatases and there are contradictory results regarding the role of Tyr kinases in the P-induced acrosome reaction. Here, we performed a simultaneous evaluation of the involvement of protein kinases and phosphatases in the P-induced acrosome reaction and in the P-induced calcium influx. Motile spermatozoa were capacitated for 18 h and different aliquots were allocated to treated or control groups and then evaluated for their ability to undergo the acrosome reaction and to increase [Ca2+ ]i in response to P. The acrosome reaction was evaluated using Pisum sativum agglutinin (PSA)-FITC, and [Ca2+ ]i was evaluated using fura 2AM. At all of the concentrations tested, PKA inhibitors significantly reduced the percentage of the P-induced acrosome reaction (p < 0.001). However, only the highest concentrations of PKA inhibitors reduced the P-induced calcium influx; lower concentrations of PKA inhibitors did not affect it. Similar results were apparent for PKC inhibitors and for tyrosine kinase inhibitors. None of the Ser/Thr phosphatase inhibitors affected the P-induced acrosome reaction or the P-induced calcium influx, except for the PP2B inhibitors that significantly reduced the P-induced acrosome reaction without affecting calcium influx. Finally, the protein tyrosine phosphatase inhibitors significantly blocked the P-induced acrosome reaction and reduced the amplitude of the P-induced calcium transient (p < 0.001) as well as the amplitude of the plateau phase (p < 0.01). The data suggest that protein kinases and possibly PP2B have a role on the acrosome reaction at some point downstream of calcium entry and that Tyr phosphatases have a role on the acrosome reaction upstream of calcium entry.


Asunto(s)
Reacción Acrosómica/fisiología , Calcio/metabolismo , Progesterona/farmacología , Proteínas Quinasas/metabolismo , Proteínas Tirosina Fosfatasas/metabolismo , Espermatozoides/metabolismo , Reacción Acrosómica/efectos de los fármacos , Humanos , Masculino , Inhibidores de Proteínas Quinasas/farmacología , Proteínas Tirosina Fosfatasas/antagonistas & inhibidores , Capacitación Espermática/efectos de los fármacos , Capacitación Espermática/fisiología , Espermatozoides/efectos de los fármacos
15.
Open Heart ; 3(1): e000386, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27042323

RESUMEN

OBJECTIVE: Female sex is considered a risk factor for adverse outcomes following isolated coronary artery bypass graft (CABG) surgery. We assessed the association between sex and short-term mortality following isolated CABG, and estimated the 'excess' deaths occurring in women. METHODS: Short-term mortality was investigated in 13 327 consecutive isolated CABG patients in North Texas between January 2008 and December 2012. The association between sex and CABG short-term mortality, and the excess deaths among women were assessed via a propensity-adjusted (by Society of Thoracic Surgeons-recognised risk factors) generalised estimating equations model approach. RESULTS: Short-term mortality was significantly higher in women than men (adjusted OR=1.39; 95% CI 1.04 to 1.86; p=0.027). This significantly greater risk translates into 35 'excess' deaths among women included in this study (>10% of the total 343 deaths in the study cohort) and into 392 'excess' deaths among the ∼40 000 women undergoing isolated CABG in the USA each year. CONCLUSIONS: The higher risk associated with female sex lead to 35 'excess' deaths in women in this study cohort (over 10% of the total deaths) and to 392 'excess' deaths among women undergoing isolated CABG in the USA each year. Further research is needed to assess the causal mechanisms underlying this sex-related difference. Results of such work could inform the development and implementation of sex-specific treatment and management strategies to reduce women's mortality following CABG. Based on our results, if such work brought women's short-term mortality into line with men's, total short-term mortality could be reduced by up to 10%.

16.
Arch Biochem Biophys ; 598: 40-9, 2016 05 15.
Artículo en Inglés | MEDLINE | ID: mdl-27059850

RESUMEN

New and stimulating results have challenged the concept that cellular senescence might not be synonymous with aging. It is indisputable that during aging, senescent cell accumulation has an impact on organismal health. Nevertheless, senescent cells are now known to display physiological roles during embryonic development, during wound healing repair and as a cellular response to stress. The fact that senescence has been found in cells that did not attain their maximal round of replications, nor have metabolic alterations or DNA damage, also challenges the paradigm that senescence is cellular aging, and it is in favor of the idea that cellular senescence is a phenomenon that has a function by itself. Therefore, in order to understand this phenomenon it is important to analyze the relationship between senescence and other cellular responses that have many features in common, such as apoptosis, cancer and autophagy, particularly highlighting their role during development and adulthood.


Asunto(s)
Envejecimiento/fisiología , Senescencia Celular/fisiología , Daño del ADN , Animales , Humanos
17.
Am J Cardiol ; 117(11): 1790-807, 2016 06 01.
Artículo en Inglés | MEDLINE | ID: mdl-27087174

RESUMEN

Mitral repair operations for correction of pure mitral regurgitation (MR) are generally quite successful. Occasionally, however, the reparative procedure incompletely corrects the MR or the MR recurs. From March 1993 to January 2016, twenty nine patients had mitral valve replacement after the initial mitral repair operation, and observations in them were analyzed. All 29 patients at the repair operation had an annular ring inserted and later (<1 year in 6 and >1 year in 21) mitral valve replacement. The cause of the MR before the repair operation appears to have been prolapse in 16 patients (55%), secondary (functional) in 12 (41%) (ischemic in 5), and infective endocarditis which healed in 1 (3%). At the replacement operation the excised anterior mitral leaflet was thickened in all 29 patients. Some degree of stenosis appeared to have been present in 16 of the 29 patients before the replacement operation, although only 10 had an echocardiographic or hemodynamic recording of a transvalvular gradient; at least 11 patients had restricted motion of the posterior mitral leaflet; 10, ring dehiscence; 2, severe hemolysis; and 2, left ventricular outflow obstruction. In conclusion, there are multiple reasons for valve replacement after earlier mitral repair. Uniformly, at the time of the replacement, the mitral leaflets were thickened by fibrous tissue. Measurement of the area enclosed by the 360° rings and study of the excised leaflet suggest that the ring itself may have contributed to the leaflet scarring and development of some transmitral stenosis.


Asunto(s)
Cuerdas Tendinosas/cirugía , Implantación de Prótesis de Válvulas Cardíacas/métodos , Insuficiencia de la Válvula Mitral/cirugía , Válvula Mitral/cirugía , Adulto , Anciano , Cuerdas Tendinosas/patología , Femenino , Estudios de Seguimiento , Humanos , Masculino , Persona de Mediana Edad , Válvula Mitral/patología , Insuficiencia de la Válvula Mitral/diagnóstico , Insuficiencia de la Válvula Mitral/fisiopatología , Falla de Prótesis , Reoperación , Estudios Retrospectivos , Resultado del Tratamiento , Adulto Joven
18.
Age (Dordr) ; 38(1): 26, 2016 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-26867806

RESUMEN

Cellular senescence is a multifactorial phenomenon of growth arrest and distorted function, which has been recognized as an important feature during tumor suppression mechanisms and a contributor to aging. Senescent cells have an altered secretion pattern called Senescence-Associated Secretory Phenotype (SASP) that comprises a complex mix of factors including cytokines, growth factors, chemokines, and matrix metalloproteinases. SASP has been related with local inflammation that leads to cellular transformation and neurodegenerative diseases. Various pathways for senescence induction have been proposed; the most studied is replicative senescence due to telomere attrition called replicative senescence (RS). However, senescence can be prematurely achieved when cells are exposed to diverse stimuli such as oxidative stress (stress-induced premature senescence, SIPS) or proteasome inhibition (proteasome inhibition-induced premature senescence, PIIPS). SASP has been characterized in RS and SIPS but not in PIIPS. Hence, our aim was to determine SASP components in primary lung fibroblasts obtained from CD-1 mice induced to senescence by PIIPS and compare them to RS and SIPS. Our results showed important variations in the 62 cytokines analyzed, while SIPS and RS showed an increase in the secretion of most cytokines, and in PIIPS only 13 were incremented. Variations in glutathione-redox balance were also observed in SIPS and RS, and not in PIIPS. All senescence types SASP displayed a pro-inflammatory profile and increased proliferation in L929 mice fibroblasts exposed to SASP. However, the behavior observed was not exactly the same, suggesting that the senescence induction pathway might encompass dissimilar responses in adjacent cells and promote different outcomes.


Asunto(s)
Envejecimiento , Senescencia Celular/fisiología , Citocinas/metabolismo , Pulmón/citología , Estrés Oxidativo , Animales , Animales Recién Nacidos , Proliferación Celular , Células Cultivadas , Daño del ADN , Fibroblastos/citología , Fibroblastos/metabolismo , Pulmón/crecimiento & desarrollo , Pulmón/metabolismo , Ratones , Fenotipo , Telómero/metabolismo
19.
Proc (Bayl Univ Med Cent) ; 29(1): 97-100, 2016 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-26722187

RESUMEN

Traditional sternal precautions, given to sternotomy patients as part of their discharge education, are intended to help prevent sternal wound complications. They vary widely but generally include arbitrary load and time restrictions (lifting no more than a specified weight for up to 12 weeks) and may prohibit common shoulder joint and shoulder girdle movements. Having observed the negative effects of restrictive sternal precautions for many years, our research team performed a series of studies that measured the forces exerted during various common activities and their relationship to the sternum. The results, though informative, led us to realize that the goal of identifying "the" appropriate load restriction to prescribe for sternotomy patients was futile. The alternative approach that we introduce applies standard kinesiological principles and teaches patients how to perform load-bearing movements in a way that avoids excessive stress to the sternum.

20.
J Surg Oncol ; 112(5): 481-5, 2015 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-26356493

RESUMEN

The inferior vena cava (IVC) is the most common site of leiomyosarcomas arising from a vascular origin. Leiomyosarcomas of the IVC are categorized by anatomical location. Zone I refers to the infrarenal portion of the IVC, Zone II from the hepatic veins to the renal veins, and Zone III from the right atrium to the hepatic veins. This is a rare presentation of a Zone I-III leiomyosarcoma. Fifty-two-years-old female with a medical history significant only for HTN was admitted to the hospital with bilateral lower extremity edema and dyspnea. Two-dimensional echo demonstrated a right atrial thrombus, extending into the IVC. On subsequent CT and MRI, a 15 cm mass was noted that began in the right atrium and extended into the IVC, with continuation below the renal veins to above the level of the confluence of the common iliac veins. The patient underwent a complete resection of the mass, replacement of the IVC with Dacron graft, total hepatectomy and bilateral nephrectomy, with liver and kidney autotransplantation. Pathology was consistent with a high grade spindle cell sarcoma of vena cava origin. Patient was readmitted approximately 4 weeks postoperatively to begin adjuvant chemotherapy. This case represents a zone I-III IVC leiomyosarcoma treated with surgical R0 resection. This included a hepatectomy, bilateral nephrectomy, and hepatic and left renal autotransplantation. These complex tumors should be treated with surgical resection, and require a multidisciplinary approach.


Asunto(s)
Hepatectomía , Trasplante de Riñón , Leiomiosarcoma/cirugía , Trasplante de Hígado , Nefrectomía , Procedimientos de Cirugía Plástica , Neoplasias Vasculares/cirugía , Vena Cava Inferior/cirugía , Femenino , Humanos , Leiomiosarcoma/patología , Leiomiosarcoma/terapia , Persona de Mediana Edad , Pronóstico , Tomografía Computarizada por Rayos X , Trasplante Autólogo , Resultado del Tratamiento , Neoplasias Vasculares/patología , Neoplasias Vasculares/terapia , Vena Cava Inferior/patología
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