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In the Posterior left pericardiotomy for the prevention of atrial fibrillation after cardiac surgery (PALACS) trial, posterior pericardiotomy was associated with a significant reduction in postoperative atrial fibrillation (POAF) after cardiac surgery. We aimed to investigate the mechanisms underlying this effect. We included PALACS patients with available echocardiographic data (n = 387/420, 92%). We tested the hypotheses that the reduction in POAF with the intervention was associated with 1) a reduction in postoperative pericardial effusion and/or 2) an effect on left atrial size and function. Spline and multivariable logistic regression analyses were used. Most patients (n = 307, 79%) had postoperative pericardial effusions (anterior 68%, postero-lateral 51.9%). The incidence of postero-lateral effusion was significantly lower in patients undergoing pericardiotomy (37% vs 67%; P < .001). The median size of anterior effusion was comparable between patients with and without POAF (5.0 [IQR 3.0–7.0] vs 5.0 [IQR 3.0–7.5] mm; P = .42), but there was a nonsignificant trend towards larger postero-lateral effusion in the POAF group (5.0 [IQR 3.0–9.0] vs 4.0 [IQR 3.0–6.4] mm; P = .06). There was a non-linear association between postero-lateral effusion and POAF at a cut-off at 10 mm (OR 2.70; 95% CI 1.13, 6.47; P = .03) that was confirmed in multivariable analysis (OR 3.5, 95% CI 1.17, 10.58; P = 0.02). Left atrial dimension and function did not change significantly after posterior pericardiotomy. Reduction in postero-lateral pericardial effusion is a plausible mechanism for the effect of posterior pericardiotomy in reducing POAF. Measures to reduce postoperative pericardial effusion are a promising approach to prevent POAF. Pathophysiological mechanisms explaining the association between postoperative pericardial effusion and the occurrence of postoperative atrial fibrillation. Hb, hemoglobin; MetHb, methemoglobin; OxyHb, oxyhemoglobin; ROS, reactive oxygen species. [Display omitted]

Abstract Objectives The optimal extent of pericardial resection in constrictive pericarditis (CP) remains a subject of surgical debate. This study compared perioperative outcomes, postoperative right ventricular (RV) function, functional status, and long-term survival between total and partial pericardiectomy in a contemporaneous single-centre cohort. Methods A retrospective analysis was performed on 102 consecutive patients undergoing pericardiectomy for CP at a single tertiary cardiac surgical centre between 2005 and 2025. Patients were stratified by operative extent into total pericardiectomy (n = 89) and partial pericardiectomy (n = 13). Preoperative, operative, and postoperative variables were compared. Long-term survival was assessed by Kaplan-Meier analysis with log-rank testing. Results Patients in the partial group were older (67 ± 11 vs 63 ± 12 years; P = .240) with higher operative risk by EuroSCORE II (7.2 ± 4.6 vs 4.9 ± 2.7; P = .010) and logistic EuroSCORE (14.5 ± 19.3 vs 5.6 ± 6.8; P <0.001). Urgent/emergency cases were more frequent in the partial group (61.5% urgent, 15.4% emergency vs 43.8% and 4.5%). Preoperative NYHA III-IV distribution was comparable (51.9% total vs 46.2% partial), as was preoperative RV function (P = .353). Conclusions Despite greater operative complexity, total pericardiectomy confers significantly superior long-term survival and functional recovery compared with partial resection. These data support total pericardiectomy as the standard of care for durable relief of CP, with appropriately selected use of cardiopulmonary bypass to facilitate complete biventricular decortication. The pericardium is a multilayered fibroelastic sac encasing the heart, serving roles as a mechanical barrier, immunomodulator, and vasomotor coordinator. Graphical Abstract For image description, please refer to the figure legend and surrounding text

Atrial fibrillation is the most common complication after cardiac surgery and is associated with extended in-hospital stay and increased adverse outcomes, including death and stroke. Pericardial effusion is common after cardiac surgery and can trigger atrial fibrillation. We tested the hypothesis that posterior left pericardiotomy, a surgical manoeuvre that drains the pericardial space into the left pleural cavity, might reduce the incidence of atrial fibrillation after cardiac surgery. In this adaptive, randomised, controlled trial, we recruited adult patients (aged ≥18 years) undergoing elective interventions on the coronary arteries, aortic valve, or ascending aorta, or a combination of these, performed by members of the Department of Cardiothoracic Surgery from Weill Cornell Medicine at the New York Presbyterian Hospital in New York, NY, USA. Patients were eligible if they had no history of atrial fibrillation or other arrhythmias or contraindications to the experimental intervention. Eligible patients were randomly assigned (1:1), stratified by CHA2DS2-VASc score and using a mixed-block randomisation approach (block sizes of 4, 6, and 8), to posterior left pericardiotomy or no intervention. Patients and assessors were blinded to treatment assignment. Patients were followed up until 30 days after hospital discharge. The primary outcome was the incidence of atrial fibrillation during postoperative in-hospital stay, which was assessed in the intention-to-treat (ITT) population. Safety was assessed in the as-treated population. This study is registered with ClinicalTrials.gov, NCT02875405, and is now complete. Between Sept 18, 2017, and Aug 2, 2021, 3601 patients were screened and 420 were included and randomly assigned to the posterior left pericardiotomy group (n=212) or the no intervention group (n=208; ITT population). The median age was 61·0 years (IQR 53·0–70·0), 102 (24%) patients were female, and 318 (76%) were male, with a median CHA2DS2-VASc score of 2·0 (IQR 1·0–3·0). The two groups were balanced with respect to clinical and surgical characteristics. No patients were lost to follow-up and data completeness was 100%. Three patients in the posterior left pericardiotomy group did not receive the intervention. In the ITT population, the incidence of postoperative atrial fibrillation was significantly lower in the posterior left pericardiotomy group than in the no intervention group (37 [17%] of 212 vs 66 [32%] of 208 [p=0·0007]; odds ratio adjusted for the stratification variable 0·44 [95% CI 0·27–0·70; p=0·0005]). Two (1%) of 209 patients in the posterior left pericardiotomy group and one (<1%) of 211 in the no intervention group died within 30 days after hospital discharge. The incidence of postoperative pericardial effusion was lower in the posterior left pericardiotomy group than in the no intervention group (26 [12%] of 209 vs 45 [21%] of 211; relative risk 0·58 [95% CI 0·37–0·91]). Postoperative major adverse events occurred in six (3%) patients in the posterior left pericardiotomy group and in four (2%) in the no intervention group. No posterior left pericardiotomy related complications were seen. Posterior left pericardiotomy is highly effective in reducing the incidence of atrial fibrillation after surgery on the coronary arteries, aortic valve, or ascending aorta, or a combination of these without additional risk of postoperative complications. None

Constrictive pericarditis is a result of chronic inflammation characterized by thickening and calcification of pericardial fibers, impaired diastolic filling, reduced cardiac output, and ultimately heart failure. The main objective of this multicenter trial is to evaluate whether conventional extracorporeal circulation pericardial resection has a better prognosis than pericardial resection without extracorporeal circulation. This study is a multicenter, randomized controlled, evaluator blinded, parallel group study with an advantageous framework. A total of 436 participants with constrictive pericarditis will be randomly assigned to either the extracorporeal circulation pericardial resection group or the non-extracorporeal circulation pericardial clearance group in a 1:1 ratio using a computer. Incomplete pericardial detachment is associated with low cardiac output syndrome after pericardial resection. The causes of low cardiac output syndrome are related to incomplete resection of thickened pericardium, unsatisfactory relief of left ventricular compression, excessive ventricular dilation after pericardial dissection, myocardial weakness, and heart failure. The relief of left ventricular compression is crucial for the postoperative recovery of cardiac function.

The present study was designed to identify the preoperative clinical and imaging findings influencing adverse clinical outcomes in patients with chronic constrictive pericarditis after pericardiectomy. Patients with constrictive pericarditis who underwent pericardiectomy between January 2009 and September 2023 were retrospectively analyzed. Preoperative evaluations included assessments of clinical symptoms, comorbidities, laboratory tests, cardiac computed tomography (CT), and transthoracic echocardiography. The volume of pericardial calcifications was quantified on calcium scoring CT. Adverse clinical events were defined as cardiovascular death or hospitalization due to cardiac causes, and all-cause mortality was assessed. Univariable and multivariable Cox proportional hazard model analysis were performed to find factors associated with adverse clinical events. Among the 91 patients with available preoperative CT scans, 26 (28.6%) experienced adverse clinical events after pericardiectomy, with 19 (20.9%) experiencing cardiovascular deaths. On multivariable Cox analysis, larger pericardial calcium volume hazard ratio [HR], 1.004 (95% confidence interval [CI], 1.001–1.006) per 1cm 3 increase; p = 0.005), higher E/E’ ratio (HR, 1.059, 95% CI, 1.015–1.105, p  = 0.008), and lower albumin level (HR, 0.476, 95% CI, 0.229–0.986, p  = 0.046) were significant factors associated with the adverse clinical events after pericardiectomy. The amount of pericardial calcification could be associated with the efficacy of pericardiectomy and potentially have implications for postoperative outcomes. Additionally, a high E/E ratio on echocardiography is indicative of unfavorable postoperative prognosis.

We aim to access the effect of pericardiectomy for constrictive pericarditis with or without cardiopulmonary bypass. This was a review of pericardiectomy for constrictive pericarditis. Cardiopulmonary bypass is actually an important maneuver to attain complete relief of the constriction. The short additional time of cardiopulmonary bypass during the procedure has very little effect on the risk of morbidity of the main operation. Incomplete pericardiectomy perhaps was the cause of postoperative remnant constriction and high diastolic filling pressure leading to multiorgan failure. Complete pericardiectomy (removal of phrenic-to-phrenic and the postero-lateral and inferior wall pericardial thickening) using cardiopulmonary bypass should be the routine for total relief of the constriction of the heart.

Background Pericardiectomy is the curative treatment for constrictive pericarditis, yet postoperative low cardiac output syndrome (LCOS) may occur. The application of venoarterial extracorporeal membrane oxygenation (VA-ECMO) in post-pericardiectomy refractory LCOS has limited case reports, and its effectiveness and safety remain unclear. This study aims to provide evidence for the effectiveness of ECMO in treating post-pericardiectomy refractory LCOS. Methods Nine cases of post-pericardiectomy ECMO from two high-volume pericardiectomy centers in China were retrospectively reviewed. Meanwhile, a literature search was performed in PubMed and Embase on December 4, 2024. After screening, 5 articles were finally included for data extraction and comprehensive analysis. Results Case Series: There were 4 cases of tuberculous etiology, 1 with a history of cardiac surgery, and 4 idiopathic cases. All patients were in New York Heart Association class III - IV at baseline. All the patients undertwent pericardiectomy via median sternotomy, and 5 patients underwent concomitant valve procedures. One patient failed to wean from the cardiopulmonary bypass (CPB) and was transferred to femoral VA-ECMO. Eight patients received femoral VA-ECMO support 4–96 h after surgery due to refractory LCOS. All the patients survived to discharge with good neurological outcomes after 120–192 h of ECMO support. Two patient were lost to follow-up, and the rest 7 patients survived to follow-up with a mean follow-up of 56 months. Literature Review: 4 case reports and 1 retrospective study were identified. In the retrospective study of 69 patients, 8 received ECMO during or after pericardiectomy with a hospital mortality rate of 63%. The four Patients of the 4 case reports were all survival at hospital discharge. Conclusions VA-ECMO might be effective for refractory LCOS after pericardiectomy in patients with constrictive pericarditis, and could improve survival rates.

In patients with recurrent pericardial effusions, pericardiectomy is indicated. The purpose of this study was to describe a transdiaphragmatic approach for subtotal pericardiectomy in dogs and to evaluate its feasibility. In total, 20 canine cadavers weighing less than 10 kg (group S) and 20 weighing more than 20 kg (group L) were used. Within each group, half underwent a subphrenic pericardiectomy via an intercostal approach and half via a transdiaphragmatic approach. For each approach and within each weight group, the percentage of resected pericardium was calculated and compared. Additionally, a case series of nine consecutive client-owned dogs that underwent a transdiaphragmatic pericardiectomy for pericardial effusion was reported. Exposure of pericardium and associated phrenic nerves was excellent in cadavers and clinical patients. In group S, the percentage of resected pericardium was not significantly different between the two approaches. In group L, on the other hand, the percentage of resected pericardium was lower with the transdiaphragmatic approach compared with the intercostal approach (P=0.001). In the clinical patients, no intraoperative complications were encountered and no recurrence of pericardial effusion was seen. Subtotal pericardiectomy via a transdiaphragmatic approach is straightforward and a safe surgical procedure to obtain permanent pericardial drainage in small and large breed dogs.

ObjectiveAim of this paper is to evaluate the outcomes of ‘idiopathic’ chronic large pericardial effusions without initial evidence of pericarditis.MethodsAll consecutive cases of idiopathic chronic large pericardial effusions evaluated from 2000 to 2015 in three Italian tertiary referral centres for pericardial diseases were enrolled in a prospective cohort study. The term ‘idiopathic’ was applied to cases that performed a complete diagnostic evaluation to exclude a specific aetiology. A clinical and echocardiographic follow-up was performed every 3–6 months.Results100 patients were included (mean age 61.3±14.6 years, 54 females, 44 patients were asymptomatic according to clinical evaluation) with a mean follow-up of 50 months. The baseline median size of the effusion (evaluated as the largest end-diastolic echo-free space) was 25 mm (IQR 8) and decreased to a mean value of 7 mm (IQR 19; p<0.0001) with complete regression in 39 patients at the end of follow-up. There were no new aetiological diagnoses. Adverse events were respectively: cardiac tamponade in 8 patients (8.0%), pericardiocentesis in 30 patients (30.0%), pericardial window in 12 cases (12.0%) and pericardiectomy in 3 patients (3.0%). Recurrence-free survival and complications-free survival was better in patients treated without interventions (log rank p=0.0038).ConclusionsThe evolution of ‘idiopathic’ chronic large pericardial effusions is usually benign with reduction of the size of the effusion in the majority of cases, and regression in about 40% of cases. The risk of cardiac tamponade is 2.2%/year and recurrence/complications survival was better in patients treated conservatively without interventions.

We aimed to determine the rate and impact of post-pericardiotomy syndrome after native valve-sparing aortic valve surgery and the perioperative factors associated with its occurrence. All consecutive patients who underwent native valve-sparing aortic valve surgery (i.e., repair ± ascending aorta replacement, valve-sparing root replacement, Ross procedure ± ascending aorta replacement) at our institution between January 2021 and August 2023 served as our study population. Post-pericardiotomy syndrome was diagnosed if patients showed at least two of the following diagnostic criteria: evidence of (I) new/worsening pericardial effusion, or (II) new/worsening pleural effusions, (III) pleuritic chest pain, (IV) fever or (V) elevated inflammatory markers without alternative causes. A logistic regression model was calculated. During the study period, 91 patients underwent native valve-sparing aortic valve surgery. A total of 21 patients (23%) developed post-pericardiotomy syndrome early after surgery (PPS group). The remaining 70 patients (77%) showed no signs of post-pericardiotomy syndrome (non-PPS group). Multivariate logistic regression revealed blood type O (OR: 3.15, 95% CI: 1.06-9.41, p = 0.040), valve-sparing root replacement (OR: 3.12, 95% CI: 1.01-9.59, p = 0.048) and peak C-reactive protein >15 mg/dl within 48 hours postoperatively (OR: 4.27, 95% CI: 1.05-17.29, p = 0.042) as independent risk factors. 73% (8/11) of patients displaying all three risk factors, 60% (9/15) of patients with blood type O and valve-sparing root replacement, 52% (11/21) of patients with blood type O and early postoperative peak C-reactive protein >15 mg/dl and 45% (13/29) of patients with early postoperative peak C-reactive protein >15 mg/dl and valve-sparing root replacement developed post-pericardiotomy syndrome. In summary, blood type O, valve-sparing root replacement and peak C-reactive protein >15 mg/dl within 48 hours postoperatively are significantly associated with post-pericardiotomy syndrome after native valve-sparing aortic valve surgery. Particularly, the presence of all three risk factors is linked to a particularly high risk of post-pericardiotomy syndrome.