BACKGROUND Ultrasound guidance during central line insertion has significantly reduced complications associated with this procedure and has led to it being incorporated as standard of care in many institutions. However, inadvertent arterial penetration and dilation remains a problem despite ultrasound guidance and can result in significant morbidity and even mortality. Dynamic ultrasound confir...

Stimuli that are recognized from a prior encounter elicit larger pupil dilations than those not. This study tests an account of this recognition dilation response (RDR) assumes newly encountered signals, like new percepts, attentional orienting responses. Because is moderated by motivational significance and expectation, the RDR was tested for these properties; manipulating incentives “old” ver...

In this paper, the maximal dissipative extensions of a symmetric singular 1D discrete Hamiltonian operator with maximal deficiency indices (2,2) (in limit-circle cases at ±∞) and acting in the Hilbert space ℓ_{Ω}²(Z;C²) (Z:={0,±1,±2,...}) are considered. We consider two classes dissipative operators with separated boundary conditions both at -∞ and ∞. For each of these cases we establish a self...