BACKGROUND Optimal timing for clamping of the umbilical cord at birth is unclear. Early clamping allows for immediate resuscitation of the newborn. Delaying clamping may facilitate transfusion of blood between the placenta and the baby. OBJECTIVES To delineate the short- and long-term effects for infants born at less than 37 completed weeks' gestation, and their mothers, of early compared to ...

BACKGROUND Perioperative blood loss is still an unsolved problem in total knee arthroplasty (TKA). The efficacy of the preoperative use of tranexamic acid (TXA) plus drain-clamping to reduce blood loss in TKA has been debated. This meta-analysis aimed to illustrate the efficacy of TXA plus drain-clamping to reduce blood loss in patients who underwent a TKA. METHODS In February 2017, a systema...

BACKGROUND AND OBJECTIVES Infrarenal aortic cross-clamping is associated to cardiovascular effects. This study aimed at analyzing the effects of halothane, isoflurane and sevoflurane on cardiovascular function of dogs following infrarenal aortic cross-clamping. METHODS Thirty mongrel dogs were randomly divided in three groups, according to equipotent (0.75 MAC) inhaled anesthetic doses: GH (n...

BACKGROUND As measurement of arterial oxygen saturation (SpO2) is common in the delivery room, target SpO2 ranges allow clinicians to titrate oxygen therapy for preterm infants in order to achieve saturation levels similar to those seen in normal term infants in the first minutes of life. However, the influence of the onset of ventilation and the timing of cord clamping on systemic and cerebral...

PURPOSE To evaluate glomerular injury in the rat model during renal warm ischemia (WI), comparing artery and vein (AV) clamping with artery only (AO) clamping. MATERIALS AND METHODS Twenty-four adult male rats underwent 60 minutes of renal WI in the left kidney. The animals were divided into three groups: AV clamping, AO clamping, and Sham surgery. After 30 days, the animals were euthanized, ...

From strain gauge arches applied directly to the longitudinal surface of the papillary muscle of the canine left ventricle, its force of contraction was recorded simultaneously with that on an epicardial segment of the ventricle immediately overlying it. Left ventricular and atrial pressures, as well as ECG and local electrograms were also recorded in a closed-heart, open-chest preparation. Act...

Chuck holders are widely used for jobs with high precision. A chuck holder consists of a nut tapered surface and thin-slotted clamping sleeve typically made hardened steel named collet. are, essentially, wedge mechanisms. In this paper, we investigated the reactions strains due to forces during chip removal process in contact elements or jaws collet by means mathematical analysis. Deflections a...

There are a huge number of bolted joints used in engineering applications. However, unreasonable design and use may lead to degradation failure the connected structure. Herein, finite element analysis method is investigate influence various factors on mechanical properties joints. To simulate actual assembly loading process, different steps were considered, given as: tightening step, initial lo...

The influence of osmolality of the external medium on the calcium (Ca) dependency of contractility of isolated electrically excited cat papillary muscle was examined. Maximum unloaded velocity of shortening was directly measured by load clamping the muscle from the preload (at the length, Lmax, at which maximum active tension was developed) to zero load (zero load clamp). Peak velocity of short...