Pulmonary endarterectomy for chronic thromboembolic pulmonary hypertension: preliminary exploration in China / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Pulmonary endarterectomy is safe and effective surgical treatment for chronic thromboembolic pulmonary hypertension. This study aimed to evaluate the efficacy of pulmonary endarterectomy in treatment of thromboembolic pulmonary hypertension.</p><p><b>METHODS</b>A retrospective study of 15 patients who underwent pulmonary endarterectomy in Beijing Chaoyang Hospital was performed. Obvious pulmonary hypertension and hypoxemia were observed in all patients. Bilateral pulmonary endarterectomy was performed under cardiopulmonary bypass with profound hypothermic circulatory arrest.</p><p><b>RESULTS</b>Two patients (2/15) died of residual postoperative pulmonary hypertension and bleeding complication. The other 13 cases had significant decrease in systolic pulmonary artery pressure ((92.8 +/- 27.4) mmHg vs. (49.3 +/- 18.6) mmHg) and pulmonary vascular resistance ((938.7 +/- 464.1) dynesxsxcm(-5) vs. (316.8 +/- 153.3) dynesxsxcm(-5)), great improvement in cardiac index ((2.31 +/- 0.69) Lxmin(-1)xm(-2) vs. (3.85 +/- 1.21) Lxmin(-1)xm(-2)), arterial oxygen saturation (0.67 +/- 0.11 vs. 0.96 +/- 0.22) and mixed venous O(2) saturation (0.52 +/- 0.12 vs. 0.74 +/- 0.16) postoperatively compared to preoperative data. Mid-term follow-up showed that the cardiac function of all cases returned to NYHA class I or II, with great improvement in 6-minute walking distance ((138 +/- 36) m) and quality of life.</p><p><b>CONCLUSIONS</b>Bilateral pulmonary endarterectomy using cardiopulmonary bypass with the aid of deep hypothermia and circulatory arrest can effectively reduce pulmonary hypertension and provide good mid-term hemodynamic and symptomatic results with low surgical mortality rate and few complications.</p>

Low-dose amiodarone for the prevention of atrial fibrillation after coronary artery bypass grafting in patients older than 70 years / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Atrial fibrillation (AF) is one of the most common arrhythmia after coronary artery bypass grafting (CABG), which not only increases the suffering of the patients, but also prolongs hospital stay and enhances cost of care, especially for patients older than 70 years. This study was designed to evaluate the efficacy and safety of low-dose amiodarone in the prevention of AF after CABG, especially for the elderly.</p><p><b>METHODS</b>Two hundred and ten senile patients undergoing off-pump CABG were included in this prospective, randomized, double-blind and placebo controlled study. Patients were given 10 mg/kg of amiodarone (low-dose amiodarone group, n = 100) or placebo (control group, n = 110) daily for 7 days before surgery and followed by 200 mg of amiodarone or placebo daily for 10 days postoperatively.</p><p><b>RESULTS</b>Postoperative AF occurred in 16 patients (16%) receiving amiodarone and in 36 (37.7%) patients receiving placebo (P = 0.006). AF occurred at (58.13 +/- 16.63) hours after CABG in the low-dose amiodarone group and at (45.03 +/- 17.40) hours in the control group (P = 0.018). The maximum ventricular rate during AF was significantly slower in the low-dose amiodarone group ((121.42 +/- 28.91) beats/min) than in the control group ((134.11 +/- 30.57) beats/min, P = 0.036). The duration of AF was (10.92 +/- 9.56) hours for the low-dose amiodarone group compared with (14.81 +/- 10.37) hours for the control group (P = 0.002). The postoperative left ventricular ejection fraction (LVEF) was significantly improved in the low-dose amiodarone group (from (59.9 +/- 10.3)% to (63.4 +/- 11.4)%, P = 0.001), and significantly higher compared with the control group ((58.5 +/- 10.7)%, P = 0.002). Both groups had a similar incidence of complication other than rhythm disturbances (12.0% vs 16.4%, P = 0.368). The low-dose amiodarone group patients had shorter hospital stays ((11.8 +/- 3.2) days vs (13.8 +/- 4.7) days, P = 0.001) and lower cost of care (RMB (79 115 +/- 16 673) Yuan vs RMB (84 997 +/- 21 587) Yuan, P = 0.031) than that of control group patients. The in-hospital mortality was not significantly different between the two groups (1.0% vs 0.9%, P = 0.946).</p><p><b>CONCLUSIONS</b>Perioperative low-dose oral amiodarone appeared to be cost-effective in the prevention and delay of new-onset postoperative AF in aged patients. It significantly reduced ventricular rate and duration of AF after CABG, decreased hospital cost and stay, as well as promoted the amelioration of left ventricular systolic function. Furthermore, low-dose amiodarone was safe to use and well tolerated with low toxic and side effects, and did not increase the risk of complications and mortality. It is proved to be a first-line therapy and as routine prophylaxis for AF after CABG, especially for elderly patients complicated with left ventricular dysfunction.</p>

Thromboendarterectomy for chronic pulmonary thromboembolism / 中国医学科学杂志(英文版)

<p><b>OBJECTIVE</b>To evaluate the improving reliability and safety of thromboendarterectomy and perioperative management for chronic pulmonary thromboembolism.</p><p><b>METHODS</b>The clinical data of 12 cases with chronic pulmonary thromboembolism, who underwent thromboendarterectomy assisted by low flow or circulation arrest with deep hypothermia, were reviewed retrospectively.</p><p><b>RESULTS</b>Pulmonary artery pressure decreased 20 to 40 mmHg immediately after surgical procedures in 9 cases. The postoperative pulmonary edema at various degrees happened in 12 cases, among them, 1 died of severe lung infection and pulmonary re-embolism at 19 days postoperation. Computed tomography pulmonary angiography and angiography of 11 cases indicated that the original obstruction of pulmonary artery disappeared. During the follow-up period of 2 months to 5 years, the clinical symptoms and activity was improved.</p><p><b>CONCLUSION</b>Thromboendarterectomy is an effective treatment for chronic pulmonary thromboembolism. The outcome of the surgical procedure needs to be further investigated and followed up regularly according to an evaluative system, because it might be influenced by multiple factors.</p>

Surgical treatment of chronic pulmonary thromboembolism / 中华外科杂志

<p><b>OBJECTIVE</b>To evaluate the perioperative management and safety of pulmonary thromboendarterectomy for chronic pulmonary thromboembolism.</p><p><b>METHODS</b>From March 1999 to March 2004, 12 patients with chronic pulmonary thromboembolism received thromboendarterectomy. The operation was performed under cardio-pulmonary bypass with low flow or circulative arrest and deep hypothermia. The clinical data of the 12 cases were reviewed retrospectively.</p><p><b>RESULTS</b>Pulmonary pressure immediately decreased 20 to 40 mm Hg (1 mm Hg = 0.133 kPa) after operation in 6 cases. Various degrees of postoperative pulmonary edema happened in 8 cases. One patient died at the 19th day after operation due to severe lung infection and pulmonary re-embolism. Eleven patients were followed-up for 2 months to 5 years, the clinical symptom and routine daily activity were improved after surgery.</p><p><b>CONCLUSION</b>Pulmonary thromboendarterectomy is an effective treatment for chronic pulmonary thromboembolism. It is very important to management of postoperative reperfusion injury and pulmonary edema. A key point to enhance the safety of surgical treatment for chronic pulmonary thromboembolism is preoperative correct evaluation and indication selection.</p>