We report the case of a patient who underwent third time revision of double heart valve replacement. Mediastinal dissection for right atrium cannulation was complicated by laceration of the superior vena cava; this required temporary rescue clamping of the vessel. The patient suffered complete visual loss related to bilateral retrobulbar haematoma. Acute elevation of superior vena cava pressure...

ABSTRACT: Vascular occlusion is used to reduce blood loss during liver resection surgery. For many decades liver resections have been performed with very high morbidity and mortality. Intraoperative blood loss has indeed repeatedly been shown to adversely influence the short-term prognosis of patients. In addition, there is evidence that blood transfusion may associate with an increased risk of...

The timing of umbilical cord clamping during the third stage of labor has been a point of contention for many years. The estimated combined blood-volume of the fetal and placental unit is 105-110 ml/ kg [1,2]. Two thirds of this volume is in the fetal circulation and one third in the placenta. In his publication “Zoonomia; or The Laws of Organic Life” originally published in 1794, Erasmus Darwi...

Delayed clamping of the umbilical cord is recommended for term and preterm infants who do not require resuscitation. However, the approach to the newly born infant with signs of fetal compromise, prematurity and extremely low birthweight, or prolonged apnea is less clear. Human and experimental animal data show that delaying the clamping of the umbilical cord until after the onset of respiratio...

Manipulation of aorta, such as side clamping of the ascending aorta, is known as a possible cause of the increased incidence of perioperative cerebrovascular accidents during myocardial revascularization. We describe an easy and cheap alternative technique for proximal anastomosis of saphenous vein to aorta using a Hegar dilator without clamping in off-pump coronary artery bypass procedures. IN...

Clamping losses are a widely discussed damping mechanism in nanoelectromechanical systems, limiting the performance of these devices. Here we present a method to investigate this dissipation channel. Using an atomic force microscope tip as a local perturbation in the clamping region of a nanoelectromechanical resonator, we increase the energy loss of its flexural modes by at least one order of ...

OBJECTIVES To describe the range of practices employed by units conducting deferred cord clamping at very preterm birth. DESIGN Qualitative study using semistructured interviews with neonatal doctors, nurses, midwives, obstetricians and managers in a sample of UK maternity units. PARTICIPANTS 33 neonatal doctors, neonatal nurses, midwives, obstetricians and managers. SETTING UK maternity ...

Sheet-metal parts produced by pressing, stamping or similar technology; usually have residual stresses, which tend to deform them. If these parts are intended to be assembled with other elements, it is necessary to perform measurements to check if constructive dimensions are within acceptable tolerance limits. Such measurements require at least four stages: positioning, clamping, measurement, u...

this paper presents the results of the assembly process of a gasketed bolted flanged pipe joint for two different bolt tightening strategies, i.e. asme and industrial using torque control of preload method.  the final clamping force is achieved in four and five passes in asme and industrial strategy respectively. axial bolt stress variation, at the end of each pass, individual bolt bending beha...