ObjectiveTo clarify the relationship between the G/C polymorphism of inflammatory gene matrix metalloproteinase-2 (MMP2) and warfarin therapy after cardiac valve replacement (CVR). MethodsWe finally identified 96 patients who received additional warfarin therapy after CVR as a trial group and 78 patients without the warfarin therapy as a control group. Gene sequencing techniques were adopted to determine single nucleotide polymorphism allele. We analyzed genotype and clinical features of the two groups and explored the relationship between the different MMP2 geno-types and warfarin therapy after CVR. Logistic regression was used to analyze the correlation between genotypes and risk factors after CVR and Kaplan-Meier survival curves were performed to analyze the survival time and efficacy of patients carrying MMP2 GC and GG genotypes. ResultsThe distribution of MMP2 genotype in patients receiving warfarin therapy after surgery was different from that in patients without warfarin therapy. The results of multivariate logistic regression analysis showed that GC and GG genotypes were risk factors of complications of CVR. The proportion of GG genotype was higher in the patients with postoperative complications compared with those without. The survival time of patients carrying genotype MMP2 GG was shorter than those carrying GC genotype (P < 0.05), which reveals that the level of MMP2 GG genotype was associated with the prognosis. ConclusionG allele of MMP2 is a risk factor of complications following CVR. GG genotype is relevant to CVR and prognosis, which can be regarded as a risk factor post CVR.
【摘要】 目的 分析心脏瓣膜置换术后死亡案例的法医病理学特点，探讨有关瓣膜置换术后死亡案例的法医病理学鉴定思路及原则。 方法 从手术方式、术前心脏状况及术中所见、法医病理检验所见、死亡时间、死亡原因等方面，对2008年1月-2010年2月4例心脏瓣膜置换术后死亡案例进行综合研究分析。 结果 4例均患有风湿性心脏病，且术前心功能较差；3例二尖瓣瓣膜置换术，3例主动脉瓣瓣膜置换术，2例三尖瓣成形术；二尖瓣瓣膜置换术1例平行房间沟的左房纵行切口，1例右心房-房间隔切口，1例右心房-房间隔-左房联合切口；主动脉瓣瓣膜置换术均行升主动脉根部斜形切口或S状切口；死亡时间为1例术中，1例术后30 min，1例术后2 d，1例术后8 d；死亡原因为1例心肌炎，1例传导系统出血，2例失血性休克；1例术前有潜在感染灶。 结论 对有关心脏瓣膜置换术后死亡案例的法医病理学鉴定时，应在了解患者瓣膜置换术前心脏情况以及手术方式、手术路径和缝合方法的基础上，结合法医病理组织学检查进行综合分析。【Abstract】 Objective To analyze the forensic pathological characteristics of those who died after cardiac valve replacement and explore the mentality and principle of documentary evidence of medicolegal expertise. Methods Four death cases after cardiac valve replacement between January 2008 and February 2010 were comprehensively analyzed from various aspects of surgery style, preoperational heart condition, peri-operational observations, results of forensic pathological tests, time of death, and causes of death. Results All cases were rheumatic heart disease and the preoperational heart function was poor. Of the four cases, three had mitral valve replacement (MVR), three had aortic valve replacement (AVR) and two had tricuspid valvuloplasty. Of the three MVR cases, cutting on the left atrium paralleling the interatrial groove was performed in one case, cutting through right atrium and interauricular septum was performed in one case, and cutting left atrium and right atrium through interauricular septum was performed in another case. For all the three AVR cases, cutting on the root of aorta with the shape of diagonal or ’S’ was carried out. One patient died during operation, one died thirty minutes after operation, one died two days after operation and one died eight days after operation. Among them, one died of myocarditis, one died of hemorrhage in the conducting system and two died of hemorrhagic shock. Besides, one patient had potential bacterial infection before surgery. Conclusion For patients who died after cardiac valve replacement, we should acquaintance ourselves with the preoperational heart condition, surgery style, surgical approach and the methods of stitch to make a comprehensive analysis with forensic pathology examination.
Objective To develop and validate a nomogram prediction model for pulmonary infection in patients following cardiac valve replacement surgery, providing a reference for early screening of high-risk populations and implementing targeted preventive measures. Methods Clinical data of patients who underwent cardiac valve replacement surgery at the Second Affiliated Hospital of Anhui Medical University from January 2020 to October 2023 were collected. Patients were randomly assigned to a modeling group and a validation group in a 7 : 3 ratio. Based on the occurrence of pulmonary infection post-surgery, patients were divided into a pulmonary infection group and a non-pulmonary infection group. Risk factors for pulmonary infection after cardiac valve replacement were analyzed using least absolute shrinkage and selection operator (LASSO) regression and logistic regression to establish a risk prediction model, which was subsequently validated. Model evaluation was conducted using the area under the receiver operating characteristic curve (AUC), calibration curves, and decision curve analysis. Results A total of 689 patients were included, comprising 354 males and 335 females, with a median age of 58.0 (50.0, 68.0) years. The incidence of pulmonary infection was 16.0% (110/689). Independent risk factors for pulmonary infection following cardiac valve replacement included emergency admission, smoking history, chronic obstructive pulmonary disease, duration of cardiopulmonary bypass, duration of tracheal intubation, and postoperative renal injury. The AUC for the modeling group was 0.911 [95%CI (0.877, 0.946) ], with a Hosmer-Lemeshow χ2-value of 6.577 (P=0.583) in the modeling group. The AUC value was 0.891 [95%CI (0.840, 0.941) ], with a Hosmer-Lemeshow χ2-value of 5.486 (P=0.705) in the validation group. The model demonstrated good discrimination, calibration, and net benefit. Conclusion The established nomogram prediction model has significant predictive value and can be applied to risk assessment and individualized treatment for pulmonary infection in patients following cardiac valve replacement surgery.
In recent years, the field of transcatheter heart valve interventional therapy has developed rapidly. Valvular thrombosis is a rare postoperative complication, which can affect valvular function early or lead to clinical embolic events, and is gradually being valued by surgeons. The clinical manifestations of thrombosis after different types of interventional valve replacement are different. Although anticoagulant therapy is believed to be effective for valve thrombosis, the selection of anticoagulant drugs and the duration of anticoagulation are still controversial. This article reviews the definition, clinical features, prevention and treatment of valve thrombosis after several types of transcatheter heart valve replacement, mainly related to transcatheter aortic valve replacement and transcatheter mitral valve replacement, and aims to provide a reference for the diagnosis and treatment of valve thrombosis after transcatheter heart valve replacement.
ObjectiveTo analyze the risk factors for the prolonged time of intensive care unit (ICU) stay after isolated heart valve replacement. MethodWe retrospectively analyzed the clinical data of 400 patients underwent heart valve replacement surgery in our hospital in 2013 year. There were 208 males and 192 females with a mean age of 50.5±11.1 years ranging from 11-85 years. We divided them into an A group with the time of ICU stay shorter than 48 hours and a B group with the time of ICU stay longer than 48 hours. We recorded the demographic characteristics, preoperative data, intraoperative data and postoperative data and analyzed those data with univariate and multivariate methods. ResultThere was a statictical difference in the demographic characteristics, preoperative data, intraoperative data and postoperative data between the 2 groups (P < 0.05). The logistic result showed that if we didn't consider the postoperative factors the prolonged time of ICU stay statistically related with age over 70 year(OR 2.024, 95%CI 1.182-3.466, P < 0.05), the cardiac grade of New York Heart Association at Ⅲ-Ⅳ(OR 3.295, 95% CI 1.030-10.544, P < 0.05), preoperative hemoglobin concentration less than 120 g/l (OR 0.500, 95%CI 0.263-0.950, P < 0.05), and the cardiopulmonary bypass time more than 180 min (OR 2.486, 95%CI 1.006-6.143, P < 0.05). If we considered the postoperitive factors, the prolonged time of ICU stay statistically linked to the cardiopulmonary bypass time longer than 180 min (OR 3.295, 95% CI 1.030-10.544, P < 0.05), the postoperative blood glucose more than 10 mmol/l (OR 2.954, 95%CI 1.334-6.543, P < 0.05), and the pulling out trachea canula 24 hours after operation (OR 6.742, 95% CI 3.005-15.124, P < 0.05). ConclusionThe prolonged time of ICU stay after valve replacement surgery is associated with a number of risk factors before, during and after heart valve replacement surgery. Targeting the risk factors, especially the postoperitive risk factors, can be effective to shorten the ICU residence time.
Objective To explore the safety and efficacy of mobile APP in telemanagement for patients who received oral warfarin anticoagulant therapy after mechanical heart valve replacement. Methods A prospective cohort study was performed. According to the inclusion and exclusion criteria, a total of 80 patients who underwent mechanical heart valve replacement for more than half a year and received oral warfarin anticoagulant therapy in outpatient department were included in our hospital from January 1, 2017 to December 31, 2017. These patients were divided into a telemanagement group (40 paitents, telemanagement using mobile APP) and a control group (40 patients, anticoagulant management in outpatient clinics) according to patients' wishes and local hospital international normalized ratio (INR) monitoring conditions. After 12-month follow-up, clinical effect of the two groups was compared. The INR, time in therapeutic range (TTR), fraction in therapeutic range (FTTR), anticoagulation-related complications and patient satisfaction were analyzed. Results During the follow-up period of anticoagulation, there was no significant difference in INR between the two groups (P=0.732). The average interval of INR monitoring in the telemanagement group was 3-65 (21.4 ± 12.5) days, while that in the control group was 7-93 (39.6 ± 14.7) days (P=0.012). TTR was 42.7% (6 027.6 d/14 116.0 d) in the control group and 67.9% (10 168.6 d/14 972.0 d) in the telemanagement group (P=0.018). And FTTR in the two groups was 45.6% (144/316) and 67.1% (432/644), respectively (P=0.015). No serious thromboembolism or hemorrhage events occurred in the 80 patients during the 12-month follow-up period. There was no significant difference in the incidence of anticoagulation-related complications, general bleeding and embolism between the two groups (P>0.05). Conclusion For patients with stable anticoagulation after cardiac mechanical valve replacement, it is safe and effective to telemanagement by mobile APP. Telemanagement can increase the frequency of anticoagulation monitoring without increasing anticoagulation risk, meanwhile, it also could obtain more convenient and rapid consultation, save time and economic costs,and improve the quality of life and patient satisfaction.