Dai Yun Cho

The effects of barrier materials on reduction of pericardial adhesion formation in rabbits: a comparative study of a hyaluronan-based solution and a temperature sensitive poloxamer solution/gel material.

OBJECTIVE This study was performed to examine the efficacy and safety of a hyaluronan solution (Guardix-SL) and a temperature sensitive poloxamer solution/gel material (Guardix-SG) on the prevention of pericardial adhesion in rabbits. METHODS A total of 60 rabbits were divided into three groups according to material applied after epicardial abrasion: the control group (group CO), the Guardix SL group (group SL), and the Guardix SG group (group SG). The ejection fraction and the presence of pericardial effusion were evaluated by echocardiograms at the immediate postoperative period and 2 wk after the surgery. The adhesion was evaluated macroscopically and microscopically 2 wk after the surgery. RESULTS In the group SG, mild pericardial effusions were observed only at the immediate postoperative period in 10 out of 20 rabbits with an insignificant reduction of the ejection fraction. Group CO had a significantly higher macroscopic adhesion and fibrosis score than did groups SL and SG (P < 0.001), and group SL had a significantly higher adhesion score than did group SG (P = 0.045). Inflammation score and the expression of anti-macrophage antibody in group CO were higher than those in groups SL and SG, although the differences were not significant. CONCLUSIONS Guardix-SL and Guardix-SG effectively reduced the adhesion formation, and Guardix-SG is more effective than Guardix-SL for preventing adhesion. However, Guardix-SG showed a potential disadvantage of decreasing the ejection fraction, although this was statistically insignificant. Further study to verify the appropriate dosage to maximize the therapeutic effect without decreasing the heart function is needed.

Is Stopping Heparin Safe in Patients on Extracorporeal Membrane Oxygenation Treatment

Anticoagulation treatment during extracorporeal membrane oxygenation (ECMO) treatment is unavoidable. However, discontinuation of heparin infusion is necessary when challenges associated with the use of heparin, such as bleeding and thrombocytopenia, are encountered. The medical records of 94 adult (age ≥ 18 years) patients treated with ECMO from January 2011 to March 2015, at Chung-Ang University Hospital, Seoul, Korea, were reviewed. Among the 94 patients, 55 patients underwent ECMO treatment for three or more days. In 52.7% of these patients (n = 29, group A), heparin was stopped for three or more days because of thrombocytopenic events (< 50,000 cells/mm3), higher than target range (> 230 seconds) activated clotting time (ACT), bleeding complications, or the need for other surgical procedures. In 43.6% of patients (n = 24, group B), heparin was continuously infused during the entire ECMO process. The mean length of ECMO support after the initiation of heparin discontinuation in patients in group A was 10.2 ± 14.7 days. There were no intracardiac, intravascular, or intracircuit thrombotic complications in group A. There was no difference in the ECMO weaning success rate between the two groups (41.4% in group A vs. 54.2% in group B, p = 0.353). Heparin discontinuation can be considered in a select group of patients with coagulation abnormalities or bleeding.

Relationship between coronary artery plaque composition by virtual histology intravascular ultrasound analysis and brachial-ankle pulse wave velocity in patients with coronary artery disease.

ObjectiveBrachial-ankle pulse wave velocity (baPWV) is an indicator of atherosclerotic cardiovascular risks. To identify patients with coronary atherosclerosis before the onset of angina pectoris or myocardial infarction will be desirable. MethodsWe measured the ankle-brachial index and baPWV in 150 consecutive patients with coronary artery disease (CAD). Virtual histology intravascular ultrasound (VH-IVUS) imaging was available in target lesions of 130 patients with symptomatic CAD before percutaneous intervention. Patients were divided into two groups: baPWV of greater than or equal to 1600 cm/s (74 patients) and baPWV of less than 1600 cm/s (56 patients). ResultsPatient age was 66±8.33 years in baPWV of greater than or equal to 1600 cm/s group versus 56±10.27 years in baPWV of less than 1600 cm/s group (P<0.0001). Although plaque burden and remodeling index were similar, minimal lumen area was smaller in baPWV of greater than or equal to 1600 cm/s group (P=0.039); and lesion length was longer in the baPWV of greater than or equal to 1600 cm/s group (P=0.033). VH-IVUS analysis of coronary artery plaque composition showed that percent mean and percent maximum dense calcium were higher in the baPWV of greater than or equal to 1600 cm/s group (P=0.0037), and percent maximal calcium correlated with baPWV (r=0.278, P=0.001). ConclusionWe concluded that there is a significant relationship between baPWV and the VH-IVUS assessment of CAD. A high baPWV indicates more severe CAD (smaller minimal lumen area and longer lesion length) and greater atherosclerosis disease complexity (more calcified coronary plaque).

Hemolytic Anemia Case Caused by an Inverted Inner Felt after Bentall Operation

A 26-yr-old male patient reported worsened dyspnea, dizziness one year after an emergency Bentall operation for type A aortic dissection. There was evidence of hemolytic anemia and aortogram revealed a significant stenosis at the distal anastomosis site. During the reoperation, we found the inner felt at the distal anastomosis was inverted causing a significant stenosis. The reoperation successfully resolved this problem. Here, we report a rare case of hemolytic anemia caused by an inverted inner felt after Bentall operation.

Neonatal Patent Ductus Arteriosus Ligation Operations Performed by Adult Cardiac Surgeons

Background Patent ductus arteriosus (PDA) ligation is usually performed by congenital cardiac surgeons. However, due to the uneven distribution of congenital cardiac surgeons in South Korea, many institutions depend solely on adult cardiac surgeons for congenital cardiac diseases. We report the outcomes of PDA ligations performed by adult cardiac surgeons at our institution. Methods The electronic medical records of 852 neonates at Chung-Ang University Hospital, Seoul, South Korea from November 2010 to May 2014 were reviewed to identify patients with PDA. Results Of the 111 neonates with a diagnosis of PDA, 26 (23%) underwent PDA ligation. PDAs were ligated within 28 days of birth (mean, 14.5±7.8 days), and the mean gestational age of these patients was 30.3±4.6 weeks (range, 26 to 40 weeks) with a mean birth weight of 1,292.5±703.5 g (range, 480 to 3,020 g). No residual shunts through the PDA were found on postoperative echocardiography. There was 1 case of 30-day mortality (3.8%) due to pneumonia, and 6 cases of in-hospital mortality (23.1%) after 30 days, which is comparable to results from other centers with congenital cardiac surgery programs. Conclusion Although our outcomes may not be generalizable to all hospital settings without a congenital cardiac surgery program, in select centers, PDA ligations can be performed safely by adult cardiac surgeons if no congenital cardiac surgery program is available.