This paper reports on research to evaluate the application of artiicial neural networks to pump condition monitoring. Based on historical velocity vibration measurements, artiicial neural networks were developed to assess pump condition. Pumps, in general, behave like most rotating equipment and evolve or deteriorate as a function of a single variable, namely time. Such evolution forms the basi...

Chronic activation of the sympathetic nervous system, via β-adrenoreceptor (AR) stimulation, contributes toward progressive heart failure. However, in this regard there are some outstanding issues which require clarity. First, in addition to contributing toward progressive heart failure, it is not clear whether chronic β-AR activation can also initiate cardiac decompensation. If so, the mechani...

Proper left ventricular assist device (LVAD) insertion will help maximize LVAD flow and may reduce adverse events such as right heart failure and pump thrombosis. Although no standardized insertion technique has been universally accepted, the goals are: unobstructed inflow cannula, unobstructed outflow graft with avoidance of right ventricular compression, and prevention of pump migration. To a...

We examined intracellular electrolytes, K influx, and [3H]ouabain-binding capacity of erythrocytes from 32 normal subjects and 45 patients with end-stage renal failure on dialysis, including 16 with high intracellular Na (mean 17.3 +/- 3.9 mmol/liter cell water). The [3H]ouabain-binding capacity of erythrocytes with high cell Na was markedly reduced as compared with that of erythrocytes from no...

INTRODUCTION Proper maintenance policy can play a vital role for effective investigation of product reliability. Every engineered object such as product, plant or infrastructure needs preventive and corrective maintenance. CASE DESCRIPTION In this paper we look at a real case study. It deals with the maintenance of hydraulic pumps used in excavators by a mining company. We obtain the data tha...

BACKGROUND Octogenarians are a challenging group of patients referred for cardiac surgery. The aim of this study is to assess early outcomes of coronary artery bypass grafting (CABG) performed in the elderly population. METHODS We performed a meta-analysis of all published observational studies comparing early results of conventional CABG surgery and off-pump CABG surgery in patients aged 80 ...

OBJECTIVES We sought to evaluate the performance of a newly designed percutaneous catheter with expandable pump. BACKGROUND The device was designed as a percutaneously insertable temporary support system for patients with acute left ventricular failure. METHODS The pump catheter (introduction diameter 9-F) is positioned in the left ventricle. The rotor is driven by an external motor through...

Cardiogenic shock (CS) is a state of extreme hypoperfusion owing to pump failure manifested by altered mental status, cool extremities, and/or renal failure. This hypoperfusion leads to release of catecholamines and other inflammatory mediators, which further perpetuates myocardial ischemia and injury, resulting in additional impairment in systemic and tissue perfusion. Any cause of acute sever...