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BACKGROUND: Functional tricuspid regurgitation may arise from left heart valve diseases or other factors. If not addressed concurrently with primary surgical intervention, it may contribute to increased morbidity and mortality rates during the postoperative period. This study investigates the impact of various repair techniques on crucial factors such as systolic pulmonary artery pressure (SPAP), tricuspid valve regurgitation, and New York Heart Association (NYHA) functional capacity class in the postoperative period. MATERIALS AND METHODS: From April 2007 to June 2013, 379 adults underwent open-heart surgery for functional tricuspid regurgitation. Patients were categorized into four groups: Group 1 (156) with De Vega suture annuloplasty, Group 2 (60) with Kay suture annuloplasty, Group 3 (122) with Flexible Duran ring annuloplasty, and Group 4 (41) with Semi-Rigid Carpentier-Edwards ring annuloplasty. Demographic, clinical, operative, and postoperative data were recorded over a mean follow-up of 35.6 ± 19.1 months. Postoperative SPAP values, tricuspid regurgitation grades, and NYHA functional capacity classes were compared among the groups. RESULTS: No statistically significant differences were observed among the groups regarding age, gender, preoperative disease diagnoses, history of previous cardiac operations, or echocardiographic characteristics such as preoperative ejection fraction, SPAP, and tricuspid regurgitation. Hospital and intensive care unit length of stay and postoperative complications also showed no significant differences. However, patients in Group 3 exhibited longer Cardio-Pulmonary Bypass duration, cross-clamp duration, and higher positive inotrope requirements. While the mortality rate within the first 30 days was higher in Group 1 compared to the other groups (p: 0.011), overall mortality rates did not significantly differ among the groups. Significant regression in functional tricuspid regurgitation and a notable decrease in SPAP values were observed in patients from Group 3 and Group 4 (p: 0.001). Additionally, patients in Group 3 and Group 4 showed a more significant reduction in NYHA functional capacity classification during the postoperative period (p: 0.001). CONCLUSION: Among the repair techniques, ring annuloplasty demonstrated superiority in reducing SPAP, regressing tricuspid regurgitation, and improving NYHA functional capacity in functional tricuspid regurgitation repairs.
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Anuloplastia de la Válvula Cardíaca , Implantación de Prótesis de Válvulas Cardíacas , Insuficiencia de la Válvula Tricúspide , Adulto , Humanos , Insuficiencia de la Válvula Tricúspide/cirugía , Insuficiencia de la Válvula Tricúspide/diagnóstico , Implantación de Prótesis de Válvulas Cardíacas/métodos , Resultado del Tratamiento , Válvula Tricúspide/cirugía , Válvula Mitral/cirugía , Técnicas de SuturaRESUMEN
OBJECTIVES: Our primary aim was to investigate the association between the preoperative concentration of plasma fibrinogen and the volume of postoperative bleeding. Our secondary aim was to identify whether there is a possible correlation between the patients' different characteristics and haemostatic laboratory variables and the postoperative amount of bleeding after on-pump coronary artery bypass grafting procedures. METHODS: A total of 550 adult patients undergoing isolated coronary artery bypass grafting on cardiopulmonary bypass in our hospital were enrolled and investigated retrospectively. The total amount of chest tube drainage within the first 24 postoperative hours or until the patient was re-explored for bleeding was assessed. Excessive bleeding was defined as more than 500 ml drainage in the first 24 h. The patients were divided into 2 groups: Group 1: the patients who bled ≤500 ml in the first 24 h and Group 2: the patients who bled >500 ml in the first 24 h. RESULTS: A preoperative fibrinogen threshold associated with excessive bleeding was investigated by receiver operating characteristic curve analyses, revealing a calculated cutoff value of 3.1 g/l. Risk factors for increased bleeding were analysed by a logistic regression model that revealed male gender (P < 0.001), body mass index ≤28.3 kg/m2 (P < 0.001), platelet count ≤233 × 103/µl (P < 0.001), estimated glomerular filtration rate ≤90.8 ml/min (P < 0.001) and fibrinogen ≤3.1 g/l (P = 0.01) as significant predictors. CONCLUSIONS: A preoperative plasma fibrinogen concentration <3.1 g/l was associated with increased risk of excessive bleeding in patients undergoing on-pump coronary artery bypass grafting. The amount of postoperative blood loss can be roughly predicted with simple preoperative blood tests.
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Puente de Arteria Coronaria/efectos adversos , Fibrinógeno/metabolismo , Hemorragia Posoperatoria/sangre , Biomarcadores/sangre , Puente Cardiopulmonar/efectos adversos , Enfermedad de la Arteria Coronaria/cirugía , Femenino , Humanos , Masculino , Persona de Mediana Edad , Recuento de Plaquetas , Hemorragia Posoperatoria/etiología , Periodo Preoperatorio , Estudios Retrospectivos , Factores de RiesgoRESUMEN
The aim of this study was to compare the graft patency rates among patients who had a previous history of percutaneous coronary intervention (PCI) followed by coronary artery bypass grafting surgery (CABG) with the patients who had experienced CABG surgery alone. The 69 patients who were included in the study had a history of bare metal stent implantation prior to CABG (group 1). The coronary angiography results were compared with 69 patients who had a previous history of CABG (group 2). Graft patency rates of the left anterior descending artery and circumflex anastomoses are statistically significant for both groups, whereas the right coronary artery anastomoses are not statistically significant (p = 0.008; 0.009; 0.2). Graft patency rate of LIMA-LAD anastomoses was 43.9 ± 10.8 % in group 1 and 86.2 ± 6 % in group 2 for means of 60 months (p = 0.0001) and circumflex coronary artery anastomosis is 28.9 ± 0.9 % in group 1, 65.7 ± 10.8 % in group 2 (p = 0.0001) and the right coronary artery anastomosis is 37.2 ± 13.6 % in group 1, 56.4 ± 8.9 % in group 2 (p = 0.0001). The graft patency rates of coronary arteries without previous stent implantation were higher than the patients with previous stent implantation and experienced CABG. The results suggest that prior PCI may induce atherosclerotic events in the vessel that can adversely affect graft patency after surgery.
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Enfermedad de la Arteria Coronaria/cirugía , Vasos Coronarios/fisiopatología , Supervivencia de Injerto/fisiología , Intervención Coronaria Percutánea/métodos , Stents , Grado de Desobstrucción Vascular , Angiografía Coronaria , Enfermedad de la Arteria Coronaria/diagnóstico , Enfermedad de la Arteria Coronaria/fisiopatología , Vasos Coronarios/diagnóstico por imagen , Femenino , Estudios de Seguimiento , Humanos , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Factores de Tiempo , Resultado del TratamientoRESUMEN
OBJECTIVE: Coronary artery bypass grafting (CABG) is gradually increasing in the elderly population. We aimed to investigate the risk factors and the results of CABG along with the long term survival in patients at an age of 80 and older. METHODS: Between January 2002 and December 2011, a total of 101 consecutive patients at an age of 80 and older who underwent CABG in our hospital were included in the study. The patients were followed and the long-term survival was estimated. RESULTS: The mean age of the patients was 82.98 ± 2.27 years. Sixty-four (63.4%) were males and 37 (36.6%) were females. Emergency surgery, duration of cardiopulmonary bypass, the intensive care unit (ICU) stay, inotropic support, intra aortic balloon pulsation application, amount of erythrocyte transfusion and fresh frozen plasma transfusion and ventilation period were significantly higher in the patients who died in the hospital. The duration of cardiopulmonary bypass (CPB) was found to be an independent predictor of mortality (OR: 1.18, 95% CI 1.01-1.38, P = 0.034). The in-hospital mortality was 16.8%. Kaplan-Meier analyses revealed a survival ratio of 91.3% at one year, 82.9% at three years and 69.0% at five years. CONCLUSIONS: Patients at the age of 80 and older can be candidates for the CABG procedure bearing in mind that they may have a longer ventilation period and intensive care unit stay. The morbidity and mortality of this age group is considered within an acceptable range. Approaches to minimize CPB, or the choice of off-pump surgery, may be a preventive method to lower the incidence of mortality. Hence, CABG may be performed in this age group with a satisfactory survival ratio.
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AIM: To compare the international normalised ratio (INR) value of patients evaluated using the CoaguChek XS versus conventional laboratory methods, in the period after open-heart surgery for mechanical valve replacement until a therapeutic range is achieved using vitamin K antagonists (VKA) together with low molecular weight heparin (LMWH). METHODS: One hundred and five patients undergoing open-heart surgery for mechanical valve replacement were enrolled. Blood samples were collected from patients before surgery, and on the second and fifth postoperative days, simultaneously for both the point of care device and conventional laboratory techniques. Patients were administered VKA together with LMWH at therapeutic doses (enoxaparin 100 IU/kg twice daily) subcutaneously, until an effective range was achieved on approximately the fifth day after surgery. RESULTS: The mean INR values using the CoaguChek XS preoperatively and on the second and fifth days postoperatively were 1.20 (SD ± 0.09), 1.82 (SD ± 0.45), and 2.55 (SD ± 0.55), respectively. Corresponding results obtained using conventional laboratory techniques were 1.18 (SD ± 0.1), 1.81 (SD ± 0.43), and 2.51 (SD ± 0.58). The correlation coefficient was r = 0.77 preoperatively, r = 0.981 on postoperative day 2, and r = 0.983 on postoperative day 5. DISCUSSION: Results using the CoaguChek XS Handheld Coagulation Analyzer correlated strongly with conventional laboratory methods, in the bridging period between open-heart surgery for mechanical valve replacement and the achievement of a therapeutic range on warfarin and LMWH.
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Anticoagulantes/administración & dosificación , Implantación de Prótesis de Válvulas Cardíacas , Relación Normalizada Internacional/instrumentación , Complicaciones Intraoperatorias/sangre , Vitamina K/antagonistas & inhibidores , Warfarina/administración & dosificación , Adulto , Anciano , Anciano de 80 o más Años , Esquema de Medicación , Quimioterapia Combinada , Enoxaparina/administración & dosificación , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios ProspectivosRESUMEN
BACKGROUND: Severe neurologic injury still represents one of the most devastating complications after surgical repair of thoracoabdominal aneurysms. We therefore aimed to investigate the protective effect of resveratrol, a natural polyphenol antioxidant present in grapes and wine, in an experimental model of spinal cord ischemia-reperfusion injury. METHODS: Sixteen rabbits were assigned either to group A (n = 8; receiving resveratrol, treated group) or group B (n = 8; control group, nontreated group) and underwent a 30-minutes period of spinal cord ischemia by clamping the abdominal aorta between the left renal artery and the aortic bifurcation. Fifteen minutes before clamping, rabbits received either intravenous resveratrol (100 microg/kg; group A) or normal saline (group B). Functional assessment with Tarlov score at 8, 16, and 24 hours postoperatively, histopathologic assessment of the spinal cord, measurements of malondialdehyde levels, and myeloperoxidase activity in the spinal cord were performed. RESULTS: Neurologic impairment (Tavlov score for group A = 4.38 +/- 1.19 and for group B = 0.38 +/- 0.74, p < 0.001), malondialdehyde levels (47.71 +/- 7.81 nmol/g versus 86.56 +/- 11.39 nmol/g, p < 0.001), and myeloperoxidase activity (2.13 +/- 0.72 nm/min versus 3.75 +/- 0.78 nm/min, p = 0.002) were significantly lower in the resveratrol-treated animals. Additionally, pathologically assessed outcomes were better in the resveratrol-treated group. The total number of motor neurons in the gray matter was significantly lower in the nontreated group than in the resveratrol-treated group (14.26 +/- 2.94 versus 29.12 +/- 3.64, p = 0.003). CONCLUSIONS: Prophylactic use of resveratrol reduced neurologic injury and provided clinical improvement by attenuating the inflammatory milieu in the rabbit spinal cord ischemia/reperfusion model.
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Fenoles/uso terapéutico , Daño por Reperfusión/complicaciones , Traumatismos de la Médula Espinal/etiología , Traumatismos de la Médula Espinal/prevención & control , Estilbenos/uso terapéutico , Animales , Masculino , Conejos , Resveratrol , VinoRESUMEN
BACKGROUND: Endothelial injury in human saphenous vein grafts may occur during harvesting and storage, which may have an adverse effect on coronary artery bypass grafting outcome. In this study, we sought to determine whether resveratrol, a natural antioxidant enriched in grape, can limit endothelial activation and reduce endothelial injury in human saphenous vein grafts. METHODS: Human saphenous vein grafts, obtained from 8 patients and divided into two equal groups of control and study specimens, were stored in either heparinized blood (group A) or heparinized blood containing 50 microg/mL resveratrol (group B) for 1 hour at room temperature. Specimens were analyzed by Western blotting to quantify intercellular adhesion molecule-1, vascular cell adhesion molecule-1, and inducible nitric oxide synthase-2 expression, as well as tissue cyclic guanylate monophosphate levels. Myeloperoxidase activity, a marker of neutrophil sequestration in human saphenous vein grafts, was also measured in each group. RESULTS: Intercellular adhesion molecule-1 expression (1,674 +/- 332 versus 559 +/- 282; p = 0.003), vascular cell adhesion molecule-1 expression (753 +/- 183 versus 472 +/- 151; p = 0.025), and myeloperoxidase activity (7.00 +/- 1.05 versus 1.33 +/- 0.45 nm/min; p = 0.004) were significantly lower in group B. In contrast, inducible nitric oxide synthase-2 expression (548 +/- 237 versus 2,234 +/- 726; p = 0.004) and tissue cyclic guanylate monophosphate levels (2.02 +/- 0.53 versus 5.61 +/- 0.89 pmol/mL; p = 0.001) were significantly higher in group B. CONCLUSIONS: Resveratrol reduced upregulation of leukocyte-endothelial cell adhesion molecule expression in human saphenous vein graft endothelium and decreased neutrophil adhesion to saphenous vein graft endothelium. Resveratrol also augmented inducible nitric oxide synthase-2 expression and increased cyclic guanylate monophosphate levels. These results suggest that resveratrol might improve vascular homeostasis and reduce endothelial injury during the hypoxic storage period of human saphenous vein grafts for coronary artery bypass grafting.
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Antiinflamatorios no Esteroideos/farmacología , Moléculas de Adhesión Celular/efectos de los fármacos , Óxido Nítrico/biosíntesis , Vena Safena/efectos de los fármacos , Estilbenos/farmacología , Anciano , Moléculas de Adhesión Celular/metabolismo , Puente de Arteria Coronaria , Humanos , Peroxidasa/metabolismo , Resveratrol , Vena Safena/metabolismoRESUMEN
We suggest an ultrastructural scoring system to evaluate the degree of damage in a time-dependent manner in cardiac myocytes after traumatic brain injury (TBI). Forty Wistar-Albino female rats weighing 170-200 g were randomly allocated into five groups. Group 1 was the control and Group 2 was the sham-operated group. Group 3, Group 4 and Group 5 were trauma groups. Weight-drop technique was used for achieving TBI. Lipid peroxidation was estimated by thiobarbituric acid test. An electron microscopic scoring model was used to grade the subcellular changes. Results of heart injury score (HIS) showed that the 24-h trauma group had statistically significant levels in nuclear damage compared with the other groups (p < 0.05). Sarcoplasmic reticulum and mitochondria scores of all trauma groups were significantly different from the control and sham groups (p < 0.05). The results showed that lipid per oxidation levels were statistically significant different between the control and all trauma groups (p < 0.05). The electron microscopic scoring model worked well in depicting the traumatic changes, which were supported by lipid peroxidation levels. Traumatic brain injury produced obvious gradual damage on the ultrastructure of the cardiac myocytes and this damage was more significant in the 24-h trauma group.
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Lesiones Encefálicas/complicaciones , Cardiomiopatías/etiología , Cardiomiopatías/patología , Miocitos Cardíacos/ultraestructura , Animales , Femenino , Peroxidación de Lípido , Masculino , Mitocondrias/metabolismo , Mitocondrias/patología , Ratas , Ratas Sprague-Dawley , Ratas Wistar , Retículo Sarcoplasmático/metabolismo , Retículo Sarcoplasmático/patología , Tiobarbitúricos/metabolismo , Factores de TiempoRESUMEN
BACKGROUND: Minimally invasive cardiac surgery has emerged as an alternative to conventional, open surgery. Although most studies of robotically assisted cardiac surgery have reported morbidity and mortality, few have addressed outcome measures, such as pain and quality of life, which was the aim of this study. METHODS: Eleven patients with atrial septal defects (ASD), and five patients with patent foramen ovale, underwent repair using the Da Vinci system (Intuitive Surgical, Mountain View, CA). The Medical Outcomes Study Short Form Survey (SF-36), along with two additional questions, were administered to these patients on postoperative day 30, along with a similar number of patients who underwent ASD repair by mini-thoracotomy or sternotomy. Quality of life endpoints included bodily pain, vitality, mental health, general health, physical function, and social function. RESULTS: Robotic patients demonstrated significantly higher scores in 6 of the eight variables (p < 0.05). There was no significant difference in intensive care unit or overall hospital stay among the groups (p = NS). Robotic patients returned to work after 40.2 +/- 30.2 days, mini-thoracotomy patients after 45.6 +/- 27.9 days, and sternotomy patients after 51.7 +/- 40.2 days (p = 0.767). There were no significant differences in SF-36 scores between patients who underwent mini-thoracotomy and sternotomy approaches. CONCLUSIONS: Closure of an ASD can be performed safely and effectively via an endoscopic approach. Robotic technology minimized the degree of invasiveness, hastened postoperative recovery, and improved quality of life, although length of hospital stay was unchanged.
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Procedimientos Quirúrgicos Cardíacos , Defectos del Tabique Interatrial/cirugía , Calidad de Vida , Robótica , Adulto , Procedimientos Quirúrgicos Cardíacos/métodos , Endoscopía , Femenino , Humanos , Masculino , Persona de Mediana Edad , Procedimientos Quirúrgicos Mínimamente Invasivos , Dolor Postoperatorio , Complicaciones Posoperatorias , Esternón/cirugía , Encuestas y Cuestionarios , ToracotomíaRESUMEN
BACKGROUND AND AIM OF THE STUDY: Angiotensin-converting enzyme (ACE) gene insertion/deletion (I/D) polymorphism, angiotensinogen (AGT) gene polymorphism and angiotensin II type 1 receptor (AT1R) polymorphism in relation to rheumatic mitral valve disease were examined in a case-control study to investigate possible relationships between these gene polymorphisms and rheumatic mitral valve disease in patients undergoing mitral valve replacement (MVR). METHODS: A total of 50 patients with rheumatic mitral valve disease and undergoing MVR was compared with 50 normal, and age- and sex-matched control subjects. ACE I/D, AGT gene M235T and AT1R-adenine/cytosine 1166 (A1166C) genotype polymorphisms were identified by polymerase chain reaction (PCR) -based restriction analysis. RESULTS: ACE I/D polymorphism differed significantly between the groups. The control group mostly represented the heterozygote ID allele (74%), while the MVR group showed frequencies of 60% for the homozygote DD and II alleles. MM homozygote frequency was significantly greater in controls, but TT homozygote frequency was significantly greater in the MVR group. AT1R-A1166C genotype polymorphism also differed significantly between groups; the MVR group had 73.7% of the AC heterozygote allele, while controls had 64.4% of the AA and 66.7% of the CC homozygote alleles. CONCLUSION: These results provided evidence of an association between ACE I/D polymorphism, M235T polymorphism and AT1R-A1166C genotype polymorphism and rheumatic mitral valve disease.
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Válvula Mitral , Polimorfismo Genético , Sistema Renina-Angiotensina/genética , Cardiopatía Reumática/genética , Adulto , Femenino , Humanos , Masculino , Persona de Mediana EdadRESUMEN
OBJECTIVES: To evaluate the effects of intravenous magnesium sulfate (Mg(2)SO(4)) administration on ischemia-reperfusion injury of the spinal cord. MATERIAL AND METHODS: Sixteen rabbits were randomly assigned to the control (group I, 8 rabbits) and the study group (group II, 8 rabbits). The abdominal aorta was clamped for a period of 30 min followed by a reperfusion period of 60 min. The animals in group II received 0.25 ml/kg/h Mg(2)SO(4) intravenous infusion (15% Mg(2)SO(4)) throughout this procedure. The animals were then observed for 24 h after which their neurological states were evaluated and tissue samples obtained from the spinal cord were examined with electron microscopy. RESULTS: Aortic pressure distal to the cross-clamp during the occlusion period was 9 +/- 3 mm Hg in group I and 19 +/- 6 mm Hg in group II. All animals in group I were paraplegic at the end of the study. In group II the neurological outcome of 1 animal was poor while the other 7 animals were neurologically in a good condition. Electron microscopic examinations of the spinal cord tissues of group I revealed severe injury but the ultrastructure was well preserved in group II. CONCLUSIONS: Intravenous Mg(2)SO(4) administration may have protective effects on the ischemia-reperfusion injury of the spinal cord. We propose that Mg(2)SO(4) may be an additional protective pharmacological agent in thoracal and thoracoabdominal aortic surgery.
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Sulfato de Magnesio/farmacología , Fármacos Neuroprotectores/farmacología , Daño por Reperfusión/patología , Isquemia de la Médula Espinal/patología , Animales , Aorta/fisiopatología , Presión Sanguínea , Inyecciones Intravenosas , Sulfato de Magnesio/administración & dosificación , Microscopía Electrónica , Sistema Nervioso/fisiopatología , Fármacos Neuroprotectores/administración & dosificación , Paraplejía/etiología , Conejos , Daño por Reperfusión/complicaciones , Daño por Reperfusión/fisiopatología , Médula Espinal/patología , Médula Espinal/fisiopatología , Médula Espinal/ultraestructura , Isquemia de la Médula Espinal/complicaciones , Isquemia de la Médula Espinal/fisiopatologíaRESUMEN
BACKGROUND AND AIM OF THE STUDY: The study aim was to investigate the long-term efficacy of closed mitral valvotomy (CMV). METHODS: Data obtained over a 36-year period from 1,134 patients who underwent CMV were analyzed. The analysis was carried out retrospectively from hospital records, with follow up examinations being conducted mainly at the outpatient clinic. RESULTS: In-hospital mortality (< or = 30 days after surgery) was 0.4% (n = 5, all closed procedures). Cardiac failure was the main cause of early death, and postoperative peripheral embolism occurred in five cases (0.5%). Freedom from thromboembolism was 99.0 +/- 0.5% at 36 years. Operative results were satisfactory in most patients, and severe mitral incompetence was seen only in three cases. Post-valvotomy mitral regurgitation occurred in 88 patients (7.7%) during the first year after CMV. Reoperation was performed in 500 patients (44.1%). The mean interval between CMV and reoperation was 141.1 +/- 80.8 months (range: 1-436 months). Fourteen patients were reoperated on for mitral regurgitation, 485 for mitral restenosis, and five for mixed mitral valve disease (stenosis and regurgitation). Freedom from reoperation after CMV was 81.4 +/- 1.3% at 10 years, 16.4 +/- 2.1% at 20 years, 3.1 +/- 1.2% at 20 years, and 0% at 36 years. Cox regression analysis indicated that impaired functional capacity, reduced mitral valve area, gradual increase in left atrial diameter and postoperative mitral insufficiency increased the reoperation rate after CMV. CONCLUSION: When compared with percutaneous balloon or surgical open valvotomy, CMV represents a satisfactory technique in terms of simplicity, high efficacy and lower cost.
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Procedimientos Quirúrgicos Cardíacos/tendencias , Cateterismo/tendencias , Estenosis de la Válvula Mitral/cirugía , Adolescente , Adulto , Causas de Muerte , Niño , Supervivencia sin Enfermedad , Ecocardiografía , Femenino , Estudios de Seguimiento , Insuficiencia Cardíaca/etiología , Insuficiencia Cardíaca/mortalidad , Insuficiencia Cardíaca/cirugía , Implantación de Prótesis de Válvulas Cardíacas/tendencias , Mortalidad Hospitalaria , Humanos , Masculino , Persona de Mediana Edad , Insuficiencia de la Válvula Mitral/etiología , Insuficiencia de la Válvula Mitral/mortalidad , Insuficiencia de la Válvula Mitral/cirugía , Estenosis de la Válvula Mitral/mortalidad , Estenosis de la Válvula Mitral/fisiopatología , Satisfacción del Paciente , Complicaciones Posoperatorias/etiología , Complicaciones Posoperatorias/mortalidad , Complicaciones Posoperatorias/cirugía , Reoperación , Índice de Severidad de la Enfermedad , Volumen Sistólico/fisiología , Tiempo , Factores de Tiempo , Resultado del Tratamiento , TurquíaRESUMEN
OBJECTIVE: This study was planned to investigate if there is any difference in terms of the muscle force between the distal and proximal segments of the latissimus dorsi muscle. SUBJECTS AND METHODS: An inplantable mock circulation system was placed around the latissimus dorsi muscle. The wrapping procedure around the implantable mock circulation was performed by using two different latissimus dorsi muscle segments. In group 1, the very proximal and in group 2, very distal part of the latissimus dorsi were wrapped. The main difference is the blood supply to the distal part of the latissimus dorsi that was interrupted during dissection. During the stimulation period which lasted 120 minutes, the pressure developed in this system and adenosine triphosphate (ATP) levels were measured. RESULTS: The stimulation at 20 Hz did not result in any change in pressure and metabolic data. When it was switched to 43 and 85 Hz, ATP levels decreased with a resultant drop in pressure in group 2. However ATP levels were 15.9 +/- 2.2 micromol/gr and 14.8 +/- 2.5 micromol/gr in group 1, 12.0 +/- 1.4 micromol/gr and 6.1 +/- 1.2 micromol/gr in group 2 at 43 and 85 Hz respectively (p < 0.05) at the end of the 90 minutes. The pressures at the same time interval were 89 +/- 11 and 102 +/- 7 mmHg in group 1, 61 +/- 7 and 65 +/- 8 mmHg in group 2 (p < 0.05). CONCLUSION: In this study, we demonstrated that changes in the distal segment of the latissimus dorsi muscle affects its performance in terms of metabolic and pressure changes during high frequency electrical stimulation at 43 and 85 Hz.
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Contracción Miocárdica/fisiología , Ventrículo de Músculo Esquelético/fisiología , Adenosina Trifosfato/metabolismo , Animales , Presión Sanguínea/fisiología , Circulación Coronaria/fisiología , Perros , Estimulación Eléctrica , Modelos Animales , Modelos Cardiovasculares , Factores de TiempoRESUMEN
The aim of the present study was to evaluate the possibility that aminophylline could serve as a potential myocardial protectant by measuring cardiac troponin T (TnT) and troponin I (TnI) during coronary artery bypass grafting (CABG). Twenty patients were randomly divided into two groups. Ten patients received aminophylline, 200 mg orally per day for 3 days preoperatively (aminophylline group, AG), and 10 patients received placebo (control group, CG). Blood samples were collected before induction of anesthesia (T0), after 30 min of aortic cross clamping (ACC) (T1), and 1, 24, and 48 h postoperatively (T2, T3, T4). Serum concentrations of TnT, TnI, and creatine kinase-MB (CK-MB) were measured. Perioperative hemodynamic data were recorded and cardiac hemodynamics were evaluated by echocardiography preoperatively and 5-7 days after surgery. There were no adverse events in either group. Preoperative serum levels of TnT and TnI were similar. Their concentrations increased after T1 and, peaked at T2 (0.50+/-0.30 vs. 0.30+/-0.40 ng/ml, and 0.50+/-0.30 vs. 7.90+/-2.70 ng/ml, respectively, P<0.001), and progressively declined until T4. The CK-MB levels of both groups also supported these results. After completion of cardiopulmonary bypass (CPB), the serum concentrations of all enzymes in both groups were significantly higher than before CPB (P<0.001), and serum TnT and TnI levels were significantly lower at T1, T2, T3, and T4 in AG (P<0.001). There was no significant difference in echocardiographic data, cardiac index, ejection fraction or any other hemodynamic parameter between the groups. Fewer patients needed inotropic support (one vs. three patients) (P=0.6) and experienced atrial fibrillation (AF) (one vs. four patients) (P=0.3) in the AG after surgery, although not statistically significant. Although there was no statistically valid evidence to indicate that aminophylline improved clinical outcome in this study, several biochemical endpoints suggested that it reduced I-R damage at the cellular level, and such subtle improvement could be clinically significant in high-risk patients.
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BACKGROUND: The successful excision of a renal cell carcinoma (RCC) invading the inferior vena cava (IVC) remains a technical intraoperative challenge and requires a careful preoperative surgical management planning. Although a radical operation remains the mainstay of the therapy for RCC, the optimal management of the patients with RCC causing IVC tumor thrombus remains unresolved. In this study, we reviewed our experience in this group of patients and herein report the results. METHODS: Between July 1990 and August 1998, 11 patients with RCC with IVC tumor thrombus underwent surgical treatment. The mean patient age was 54.2 years and the male to female ratio was 1.75. The cephalad extension of the tumor was suprarenal in all cases, being infrahepatic in 6 patients, intrahepatic in 2, and suprahepatic with right atrial extension in 3 patients. All tumors were resected via inferior vena cava isolation and, when necessary, extended hepatic mobilization and Pringle maneuver, with primary or patch closure of vena cavotomy. Cardiopulmonary bypass (CPB) and deep hypothermic circulatory arrest (DHCA) were used in 3 patients. RESULTS: The mortality rate was 9.1% (1 patient was lost on the 11th postoperative day). Complications occurred in 3 patients. The remaining 10 patients (90.9%) could be successfully discharged from hospital. Two of them were lost during follow-up because of tumor progression at the 43rd and 54th postoperative months. The 10-year Kaplan-Meier survival estimate was 71.4%, with a mean follow-up of 4.6 years. The presence of lymph node metastases and perinephric spread seemed to possess an adverse effect on the survival. Although the groups included small numbers of patients, there was no significant difference in survival in regard to the different levels of tumor thrombus extension into the vena cava. CONCLUSIONS: Surgical treatment is the preferred approach to patients with RCC and IVC tumor thrombi as it provides markedly better results when compared with the other therapeutical modalities. We believe that complete surgical excision of the tumor and the resulting thrombus with appropriate preoperative staging and a well-planned surgical approach, using CPB and DHCA when necessary, provide an acceptable long-term survival with a good quality of life expectation.