BACKGROUND Obesity reduces FVC, the most commonly used measurement of vital capacity (VC) and slow VC (SVC). It is unknown whether the difference between SVC and FVC is constant in different body mass indices (BMIs). We hypothesized that the difference between SVC and FVC increases as a function of BMI. METHODS We retrospectively reviewed pulmonary function tests (PFTs) that included spiromet...

As an extension of ν-support vector machine for classification (SVC), Extended ν-SVC was developed by Perez-Cruz et al. Their numerical experiments confirm the validity of Extended ν-SVC, but we need to solve a nonconvex QP problem for Extended ν-SVC. In the paper, we propose a modification for the existing algorithm of Extended ν-SVC, which makes possible to analyze the finite convergence and ...

Percutaneous transluminal stenting has been well documented in use for the treatment of superior vena cava (SVC) obstruction. It offers relatively safe and rapid alleviation of the symptoms of SVC obstruction due to malignancy compared with other treatment modalities. However, cardiac tamponade after stenting treatment occasionally occurrs. Here, we present a case of 48-year-old female patient ...

BACKGROUND Repair of partial anomalous pulmonary venous connection (PAPVC) to the high portion of the superior vena cava (SVC) may be complicated by atrial arrhythmia and obstruction of the pulmonary veins or SVC. We reviewed our experience with the modified Warden technique, in which the SVC was transected and anastomosed to the right atrial appendage with anterior augmentation of pedicled aut...

Superior Vena Cava (SVC) syndrome is an uncommon but known complication of Implantable Cardioverter Defibrillator (ICD) and pacemaker lead placement. In general 0.2 to 3% of all implants are associated with symptomatic SVC stenosis. Stent placement is a viable option for benign SVC syndrome in the absence of indwelling pacing leads. The risk of perforation and lead fracture increases when large...

Introduction Precise anatomical knowledge of the great vessels of the neck and thorax and their variations is essential for safe anesthesia, intensive care practice, placement of central venous catheters, pacemaker implantation using the transvenous approach, etc. Occurrence of persistent left superior vena cava (SVC) with absent right SVC are venous system variations that could impede such pro...

Obstruction of blood flow in the superior vena cava (SVC) results in symptoms and signs of SVC syndrome. SVC obstruction can be caused either by invasion or external compression of the SVC by contagious pathologic processes involving the right lung, lymph nodes, and other mediastinal structures, or by thrombosis of blood within the SVC. Occasionally, both mechanisms co-exist. We hereby report a...

BACKGROUND The superior vena cava (SVC) has cardiac musculature extending from the right atrium. However, no previous study in humans has given details regarding the ectopic foci that initiate paroxysmal atrial fibrillation (PAF), which may originate from the SVC. METHODS AND RESULTS A total of 130 patients with frequent attacks of PAF initiated by ectopic beats were included. Eight patients ...

Superior vena cava (SVC) syndrome is not an uncommon occurrence in patients with malignancy and it is often described as a medical emergency. In majority of the cases, SVC syndrome occurs due to mechanical obstruction of the SVC by extraluminal compression with primary intrathoracic malignancies. However, intraluminal obstruction due to thrombosis can also produce symptoms and signs of SVC synd...

Superior vena cava (SVC) syndrome is not an uncommon occurrence in patients with malignancy and it is often described as a medical emergency. In majority of the cases, SVC syndrome occurs due to mechanical obstruction of the SVC by extraluminal compression with primary intrathoracic malignancies. However, intraluminal obstruction due to thrombosis can also produce symptoms and signs of SVC synd...