Radiofrequency catheter ablation of premature ventricular contractions from near the His-bundle.

OBJECTIVE: This study aimed to investigate the effects of radiofrequency catheter ablation (RFCA) and clinical and electrophysiological characteristics in symptomatic patients with premature ventricular contractions (PVCs) from near the His-bundle (His-PVCs). METHODS: The patient characteristics, prevalence of complications with any life style related disease (ALSRD) including hypertension, dyslipidemia, or diabetes mellitus, and/or cardiovascular disease (CVD) including coronary artery disease, cerebrovascular disease, renal dysfunction, or cardiomyopathy, clinical status, frequency of PVCs evaluated by 24hour Holter monitoring, echocardiography including the left ventricular diastolic dysfunction (LVDD) parameters, and electrophysiological findings were evaluated in 14 consecutive symptomatic patients with His-PVCs. RESULTS: The prevalence of males, being elderly and/or slightly obese, current and/or history of smoking, ALSRD or CVD related complications, and LVDD probably resulting from ALSRD and/or CVD complications were higher in patients with His-PVCs. RFCA of His-PVCs steadily decreased the PVC frequency and improved the systolic function, LV dilation, and clinical status, but not the LVDD. There was a significant relationship between the accordance rate of the QRS polarity between sinus rhythm and His-PVCs and the distance between the successful ablation site and His-bundle. CONCLUSION: The analysis of the QRS duration and accordance rate of the QRS polarity between sinus rhythm and His-PVCs before the RFCA may help to determine the distance between the origin of the PVCs and His-bundle. Further, the appropriate ablation catheter may be selected during the RFCA procedure. Finally, RFCA may be one of the most effective, feasible, and safest therapies for symptomatic patients with His-PVCs.

Clinical benefits of deep sedation with a supraglottic airway while monitoring the bispectral index during catheter ablation of atrial fibrillation.

BACKGROUND: Pulmonary vein antrum isolation (PVAI) under sedation has proven to be a useful strategy for catheter ablation of atrial fibrillation (AF). METHODS: To evaluate the clinical benefits of respiratory management using supraglottic airways (SGAs) under deep sedation while monitoring the bispectral (BIS) index during the PVAI and the durations from admission to the catheterization room to starting the radiofrequency energy delivery (Time α), and from starting the radiofrequency energy delivery to completion of the PVAI (Time ß), X-ray time, frequency of dislocations of the three-dimensional maps (D3DM), procedure-related complications, and proportion of an AF-free rate 15 months after the PVAI (PAFFR) in patients who received deep sedation without SGAs (Group A: n=48) and those with SGAs (Group B: n=51) were evaluated. RESULTS: There were no significant differences in patient characteristics, Time α (77±3 versus 78±2 min; p=0.816), complications of cardiac tamponade (2% versus 2%; p=0.966), or PAFFR (81% versus 88%; p=0.313) between the two groups. However, the Time ß (84±4 versus 67±3; p=0.001), X-ray time (53±2 versus 34±2; p<0.001), and minor complications of nasal bleeding (25% versus 0%; p=0.001) were significantly shorter and lower in Group B than in Group A, in accordance with a reduction in the hypoxia (15% versus 0%; p=0.007) and D3DM (31% versus 8%; p=0.003). CONCLUSIONS: These results may demonstrate the clinical benefits of deep sedation with SGAs while monitoring the BIS index without any hypoxia during PVAI in patients with AF.

Inappropriate Sinus Tachycardia Diagnosed and Treated as Depression Successfully Treated by Radiofrequency Catheter Ablation.

We experienced a man in his 20s with inappropriate sinus tachycardia (IST) initially diagnosed and treated as depression who was steadily treated with radiofrequency catheter ablation (RFCA) using an EnSite™ system. The patient has remained well without any symptoms or medications, including antidepressants, for two years since the RFCA. To avoid missing IST and treating it as an emotional problem and/or mental illness such as depression, physicians - including cardiologists - should be aware of these conditions when examining patients with multiple and incapacitating complaints including palpitations and general fatigue and/or tachycardia, especially characterized by an elevated resting heart rate or a disproportionate increase in the heart rate with minimal exertion.

Compression of trachea and left main bronchus by arch aneurysm.

We report on the case of a 70-year-old woman who presented dyspnea. Contrast-enhanced computed tomography of the chest revealed the compression of the lower part of the trachea and left main bronchus by an aneurysm of the ascending aorta and aortic arch. Although we performed a replacement of the ascending aorta and aortic arch, we were unable to relieve the stenosis of the trachea and bronchus. By the suspension of the posterior wall of the native aneurysm, we were able to successfully relieve the compression and alleviate the respiratory insufficiency.

Coronary artery bypass grafting and aortic valve replacement in a patient with a tracheostoma.

We report a 67-year-old man with a tracheostoma who successfully underwent coronary artery bypass grafting and aortic valve replacement. He had received both a tracheostoma just above the sternal notch after total laryngectomy. As the standard full sternotomy might cause mediastinitis, we performed the operation through a lower half sternotomy with a limited skin incision. Postoperatively the wound was covered with a sterile plastic drape to prevent infection from the tracheostoma. The postoperative course was uneventful.

Coronary artery bypass grafting with absent right superior vena cava in visceroatrial situs solitus.

We report on a 63-year-old man with an absence of right superior vena cava in visceroatrial situs solitus who underwent coronary artery bypass grafting. Preoperative echocardiography showed a dilated coronary sinus, and venography confirmed an absent right and a persistent left superior vena cava. Perioperatively, placement of a pulmonary artery catheter, site of venous cannulation, and management of associated rhythm abnormalities were of great concern. The assessment of the right superior vena cava is advisable in carrying out the surgical procedure without any difficulties related to this anomaly when the persistent left superior vena cava is suspected.

Extended total arch replacement for type B aortic dissection with ascending aneurysm following healed aortic dissection.

We describe a case of type B aortic dissection with large ascending aortic aneurysm occurring 12.8 years after aortic root replacement (Cabrol procedure) in a non-Marfan patient with cystic medial necrosis of the aorta. We have successfully performed an extended total aortic arch replacement using a four-branched graft through the "L-incision" approach (a combination of a left anterior thoracotomy and upper half median sternotomy). Of note, a histological specimen from the aneurysmal ascending aortic wall revealed "healed aortic dissection" with fibrous tissue replacing the media and intima in addition to multiple foci of cystic medial necrosis.

A modified valve-on-valve approach for aortic root replacement.

We describe an alternative surgical technique for aortic root replacement in a patient whose aortic valve was previously replaced with a bioprosthesis. It consists of resecting the leaflets of the original bioprosthesis in situ, amputating the struts, and suturing the skirt of a composite graft on the preserved annulus of the original bioprosthesis. Coronary circulation is reconstructed according to the Cabrol modification. This approach simplifies and shortens the procedure of aortic root replacement, minimizing the potential hazard of hemorrhage from the proximal suture line in these cases.