An elderly normotensive man underwent percutaneous ultrasonic lithotripsy for renal stone disease, the procedure lasting three hours and the fragments being washed out with 20 l 1.5% glycine. After two hours the inflation pressure had risen to 25 cm H2O and his blood pressure to 150 mm Hg. Inflation pressure continued to rise until drainage tubes were inserted into the retroperitoneal space, re...

Deep inspiration temporarily reduces induced airways obstruction in healthy subjects. This bronchodilatory effect of deep inspiration is impaired in asthma. Passive machine-assisted lung inflation may augment bronchodilation compared with an active deep inspiration in patients with asthma by either opening closed airways or by reducing fluid flux across the airway wall during deep inspiration, ...

PURPOSE This two-part prospective investigation was designed to determine the balloon inflation pressures required to dilate stenoses associated with hemodialysis grafts and evaluate the burst pressures of five different angioplasty balloons. MATERIALS AND METHODS Eighty-nine patients with dysfunctional hemodialysis grafts were enrolled and underwent fistulography. The diagnostic studies reve...

Airway pressure release ventilation is a recently described method of ventilatory support. It allows spontaneous ventilation with CPAP but differs from conventional ventilatory modes because, with APRV, peak inflation pressure never exceeds the level of CPAP, and airway pressure decreases, rather than increases, when tidal volume is delivered. The risk of pulmonary barotrauma and adverse hemody...

In an investigation of the influence of glutaraldehyde fixation pressure and subsequent valve constraint on the coaptive characteristics of porcine aortic valves, 14 valves were examined, eight having been fixed at low pressure (congruent to 1 mm Hg) and six at high pressure (80 mm Hg). The coaptive ratios of the left and right coronary leaflets in the low-pressure-fixed valves showed a signifi...

AIM To compare the influence of devices for manual ventilation and individual experience on the applied respiratory mechanics and sustained lung inflation. METHODS A total of 114 instructors and non-instructors from the Neonatal Resuscitation Program of the Brazilian Society of Pediatrics participated in this study. Participants ventilated an intubated manikin. To evaluate respiratory mechani...

This paper demonstrates, contrary to what has been shown recently, that demand pressure, besides differentiated cost-pressure, matters both in the labor market and the market for goods in the determination of wage and price inflation. We consider from the theoretical perspective and estimate for the USA, using OLS and more advanced methods, both separately and simultaneously wage and price Phil...

A finite element modeling of tire using Ansys is used to analyze the free vibration of radial pneumatic tires. The natural frequencies and mode shapes of pneumatic tires are investigated. The effects of some parameters such inflation pressure, tread pattern, ply-angles and thickness of belts on the natural frequency of tires are investigated. Keywords— natural frequency, inflation pressure, tre...

N recent years, many countries have experienced “stagflation,” a period of high and rising inflation and unemployment. Over this time, higher inflation increasingly has come to be blamed for higher unemployment and reduced growth of real output. This contrasts sharply with previously held notions that there was either a long-run tradeoff between inflation and unemployment or a “natural rate of ...

Ischemic tracheal complications due to the ETT cuff occur in approximately 10 percent of mechanically ventilated critically ill patients despite the use of high-volume, low-pressure ETT cuffs. Using a laboratory model, we studied the effects of airway pressure on three different ETT cuff designs, including two "low pressure" designs. Positive airway pressure acted on the "low pressure" cuffs to...