[Assessment of mental symptoms in intensive care unit patients : Suggestion for a German version of the Intensive Care Psychological Assessment Tool]

BACKGROUND

Intensive care unit (ICU) treatment may be associated with mental symptoms such as anxiety, depressed mood, hopelessness and nightmares in critically ill patients. While many physical symptoms can be detected via standardized measures, an instrument to assess mental symptoms is actually missing.

OBJECTIVES

An existing validated screening tool to detect mental symptoms in critically ill patients, the Intensive Care Psychological Assessment Tool (IPAT), has been translated into German and tested in two surgical ICUs and an intermediate care unit.

MATERIALS AND METHODS

In addition to the German translation of the IPAT, Stait-Trait-Anxiety-Inventory (STAI-SKD) and Hospital Anxiety and Depression Scale (HADS-D) were used to determine convergent validity. Within a survey period of 3 months, a total of 90 awake and fully oriented patients were included in the study.

RESULTS

Internal consistency of the German translation was lower than that of the original study. The initial factor structure was partially replicated. Convergent validity was demonstrated for depressive and anxiety symptoms, but not for the presence of delirium. Patients who completed the screening were frequently suffering from sleep disturbances, tension, anxiety and depressed mood. A total of 37% of the patients exceeded the cut-off and are considered at-risk patients for psychological sequelae.

DISCUSSION

With regard to test quality, the results of the German version are currently not satisfactory. This may be due to the small sample size and sample selectivity, which is also the largest limitation of the study. The instrument proved to be practicable if patients can complete it as an interview. The adaptation for external assessment seems to be useful to capture psychological stress in patients with impaired communication and perception.

Field-Tunable 0-π-Transitions in SnTe Topological Crystalline Insulator SQUIDs

The manifestation of spin-orbit interactions, long known to dramatically affect the band structure of heavy-element compounds, governs the physics in the surging class of topological matter. A particular example is found in the new family of topological crystalline insulators. In this systems transport occurs at the surfaces and spin-momentum locking yields crystal-symmetry protected spin-polarized transport. We investigated the current-phase relation of SnTe thin films connected to superconducting electrodes to form SQUID devices. Our results demonstrate that an assisting in-plane magnetic field component can induce 0-π-transitions. We attribute these findings to giant g-factors and large spin-orbit coupling of SnTe topological crystalline insulator, which provides a new platform for investigation of the interplay between spin-orbit physics and topological transport.

Proximity-Induced Superconductivity and Quantum Interference in Topological Crystalline Insulator SnTe Thin-Film Devices

Topological crystalline insulators represent a new state of matter, in which the electronic transport is governed by mirror-symmetry protected Dirac surface states. Due to the helical spin-polarization of these surface states, the proximity of topological crystalline matter to a nearby superconductor is predicted to induce unconventional superconductivity and, thus, to host Majorana physics. We report on the preparation and characterization of Nb-based superconducting quantum interference devices patterned on top of topological crystalline insulator SnTe thin films. The SnTe films show weak anti-localization, and the weak links of the superconducting quantum interference devices (SQUID) exhibit fully gapped proximity-induced superconductivity. Both properties give a coinciding coherence length of 120 nm. The SQUID oscillations induced by a magnetic field show 2π periodicity, possibly dominated by the bulk conductivity.