Paradoxical response of intracranial pressure to shunt valve setting adjustments

Novel method for controlling cerebrospinal fluid flow and intracranial pressure by use of a tandem shunt valve system.

OBJECTIVE Programmable shunt valve systems have improved the management of patients with hydrocephalus. However, associated problems such as over-drainage and slit-like ventricles, even in patients with anti-siphon devices installed, still remain unresolved. METHODS We conceived a novel tandem shunt valve system to overcome the problems with existing shunt valve systems. Experiments were perf...

Paradoxical response to levalbuterol.

Asthma is a common condition that can substantially affect patients' quality of life. Although several drugs, most commonly beta-adrenergic agonists, alleviate symptoms of asthma, they may cause paradoxical bronchospasm or paradoxical bronchoconstriction. Levalbuterol hydrochloride-a pure form of the (R)-stereoisomer in racemic albuterol-eliminates the adrenergic properties that can cause such ...

Yield and Yield adjustments of nonprolific maize hybrids in response to plant population density

Extracranial-Intracranial Vascular Shunt Procedures

Cerebrovascular occlusive disease has been and continues to be a leading cause of death and disability throughout the world. In the United States there a re about 400,000 new strokes each year. 1 Some 90% of strokes are a result of vascular occlusion of the extracranial circulation.2 Surgical treatment of occlusive vascular diseases, principally carotid endarterectomy, has become an accepted me...

The Intracranial Volume Pressure Response in Increased Intracranial Pressure Patients: Clinical Significance of the Volume Pressure Indicator

BACKGROUND For patients suffering from primary brain injury, monitoring intracranial pressure alone is not enough to reflect the dynamic intracranial condition. In our previous study, a segment of the pressure-volume curve can be expressed by the parabolic regression model with single indicator "a". The aim of this study is to evaluate if the indicator "a" can reflect intracranial conditions. ...