AIMS The accurate postoperative assessment of mitral valve repair is important not only to document operative outcome, but also to confirm the functional morphology of the repaired valve. METHODS AND RESULTS We assessed 25 consecutive patients following mitral valve repair with transthoracic real-time 3-dimensional echocardiography (RT3DE) and 2-dimensional echocardiography (2DE). We compared...

BACKGROUND Percutaneous balloon mitral valvotomy (BMV) is the gold standard treatment for rheumatic mitral stenosis (MS) in that it causes significant changes in mitral valve area (MVA) and improves leaflet mobility. Development of or increase in mitral regurgitation (MR) is common after BMV. This study evaluated MR severity and its changes after BMV in Iranian patients. METHODS We prospectiv...

AIMS Management of patients with mitral stenosis (MS) relies on accurate evaluation of the mitral valve area (MVA). Planimetry (MVA(2D)) is considered as the reference method but must be performed at the tips of the leaflets with the correct plane orientation and therefore requires experienced operators. Real-time three-dimensional echocardiography (RT3DE) may overcome this limitation but its u...

We examined the long-term effects of closed instrumental mitral commissurotomy on mitral valve area (MVA) in 18 patients, followed for as long as 14 years after successful operation. Each patient had preoperative and early postoperative cardiac catheterization; late postoperative determination of MVA was obtained 10-14 years (mean 12.2 years) after commissurotomy. In 17 patients, the MVA was de...

OBJECTIVES We sought to determine whether noninvasive planimetry of the mitral valve area (MVA) by magnetic resonance imaging (MRI) is feasible and reliable in patients with mitral stenosis (MS). BACKGROUND Accurate assessment of MVA is particularly important for the management of patients with valvular stenosis. Current standard techniques for assessing the severity of MS include echocardiog...

Recently, public bicycle sharing system (PBSS) has become one of the most favorite urban transportation systems that can help governments to decrease environmental problems such as pollution and traffic. This paper studies a sharing system that includes two types of stations. The first category contains stations that users can rent or return back bicycles and each bicycle can be rented by any n...

We propose an approximate approach for estimating the performance measures of the re-entrant line with single-jobmachines and batch machines based on the mean value analysis (MVA) technique.Multi-class jobs are assumed to be processed in predetermined routings, in which some processes may utilize the same machines in the re-entrant fashion. The performance measures of interest are the steady-st...

Several approximate Mean Value Analysis (MVA) shared memory multiprocessor models have been developed and used to evaluate a number of system architectures. In recent years, the use of superscalar processors, multilevel cache hierarchies, and latency tolerating techniques has signi cantly increased the complexity of multiprocessor system modeling. We present an analytical performance model whic...

Several approximate Mean Value Analysis (MVA) shared memory multipro-cessor models have been developed and used to evaluate a number of system architectures. In recent years, the use of superscalar processors, multilevel cache hierarchies, and latency tolerating techniques has signiicantly increased the complexity of multiprocessor system modeling. We present an analytical performance model whi...