Read by QxMD icon Read

Optimal cpp

Vasilije Stambolija, Martina Miklić Bublić, Marin Lozić, Jakob Nemir, Miroslav Ščap
Background: Low brain tissue oxygen tension (PbtO2 ), or brain hypoxia, is an independent predictor of poor outcome. Increasing inspirational fraction of oxygen could have a significant influence on treating lower PbtO2 . Combined PbtO2 therapy, compared to the approach that focus only on regulation of cerebral perfusion pressure and intracranial pressure, shows better patient outcomes. Monitoring of PbtO2 could be helpful in individualizing treatment, preventing or limiting secondary brain injury, and maintaining better patient outcome...
2018: Surgical Neurology International
Sophie Kelly, Steven M Bishop, Ari Ercole
OBJECTIVES: The pressure-reactivity index (PRx) is defined in terms of the moving correlation coefficient between intracranial pressure (ICP) and mean arterial pressure (MAP) and is a measure of cerebral autoregulation ability. Plots of PRx against cerebral perfusion pressure (CPP) show a U-shaped behaviour: the minimum reflecting optimal cerebral autoregulation (CPPopt). However U-shaped behaviour may also occur by chance. To date there has been no evaluation of the statistical properties of these signals...
2018: Acta Neurochirurgica. Supplement
J Donnelly, M Czosnyka, H Adams, C Robba, L A Steiner, D Cardim, B Cabella, X Liu, A Ercole, P J Hutchinson, D K Menon, M J H Aries, P Smielewski
OBJECTIVES: Retrospective data from patients with severe traumatic brain injury (TBI) indicate that deviation from the continuously calculated pressure reactivity-based "optimal" cerebral perfusion pressure (CPPopt) is associated with worse patient outcome. The objective of this study was to assess the relationship between prospectively collected CPPopt data and patient outcome after TBI. METHODS: We prospectively collected intracranial pressure (ICP) monitoring data from 231 patients with severe TBI at Addenbrooke's Hospital, UK...
2018: Acta Neurochirurgica. Supplement
Murad Megjhani, Kalijah Terilli, Andrew Martin, Angela Velazquez, Jan Claassen, David Roh, Sachin Agarwal, Peter Smielewski, Amelia K Boehme, J Michael Schmidt, Soojin Park
OBJECTIVE: The objective was to explore the validity of industry-parameterized vital signs in the generation of pressure reactivity index (PRx) and optimal cerebral perfusion pressure (CPPopt) values. MATERIALS AND METHODS: Ten patients with intracranial pressure (ICP) monitors from 2008 to 2013 in a tertiary care hospital were included. Arterial blood pressure (ABP) and ICP were sampled at 240 Hz (of waveform data) and 0.2 Hz (of parameterized data produced by heuristic industry proprietary algorithms)...
2018: Acta Neurochirurgica. Supplement
M Cabeleira, M Czosnyka, X Liu, J Donnelly, P Smielewski
OBJECTIVES: Optimal cerebral perfusion pressure (CPPopt) is a concept that uses the pressure reactivity (PRx)-CPP relationship over a given period to find a value of CPP at which PRx shows best autoregulation. It has been proposed that this relationship be modelled by a U-shaped curve, where the minimum is interpreted as being the CPP value that corresponds to the strongest autoregulation. Owing to the nature of the calculation and the signals involved in it, the occurrence of CPPopt curves generated by non-physiological variations of intracranial pressure (ICP) and arterial blood pressure (ABP), termed here "false positives", is possible...
2018: Acta Neurochirurgica. Supplement
M Moreira, D Fernandes, E Pereira, E Monteiro, R Pascoa, C Dias
OBJECTIVE: Severe traumatic brain injury (TBI) management has been associated with adult respiratory distress syndrome (ARDS) in previous literature. We aimed to investigate the relationships between optimal CPP-guided management, ventilation parameters over time and outcome after severe TBI. MATERIALS AND METHODS: We performed retrospective analysis of recorded data from 38 patients admitted to the NCCU after severe TBI, managed with optimal cerebral perfusion pressure (CPPopt)-guided therapy, calculated using pressure reactivity index (PRx)...
2018: Acta Neurochirurgica. Supplement
Ari Ercole, Peter Smielewski, Marcel J H Aries, Robin Wesselink, Jan Willem J Elting, Joseph Donnelly, Marek Czosnyka, Natasha M Maurits
OBJECTIVE: An 'optimal' cerebral perfusion pressure (CPPopt) can be defined as the point on the CPP scale corresponding to the greatest autoregulatory capacity. This can be established by examining the pressure reactivity index PRx-CPP relationship, which is approximately U-shaped but suffers from noise and missing data. In this paper, we present a method for plotting the whole PRx-CPP relationship curve against time in the form of a colour-coded map depicting the 'landscape' of that relationship extending back for several hours and to display this robustly at the bedside...
2018: Acta Neurochirurgica. Supplement
T Lo, I Piper, B Depreitere, G Meyfroidt, M Poca, J Sahuquillo, T Durduran, P Enblad, P Nilsson, A Ragauskas, K Kiening, K Morris, R Agbeko, R Levin, J Weitz, C Park, P Davis
OBJECTIVES: Validated optimal cerebral perfusion pressure (CPP) treatment thresholds in children do not exist. To improve the intensive care unit (ICU) management of the paediatric traumatic brain injury (TBI) population, we are forming a new paediatric multi-centre collaboration to recruit standardised ICU data for running and reporting upon models for assessing autoregulation and optimal CCP (CPPopt). MATERIALS AND METHODS: We are adapting the adult BrainIT group's approach to develop a new Paediatric Brain Monitoring and Information Technology Group (KidsBrainIT), which will include a repository to store prospectively collected high-resolution physiological, clinical, and outcome data...
2018: Acta Neurochirurgica. Supplement
Noriyasu Kamei, Chikako Shigei, Ryota Hasegawa, Mariko Takeda-Morishita
This present study aimed to determine the optimal oral insulin delivery conditions that would maximize the utility of cell-penetrating peptides (CPPs) by using a noncovalent strategy. We first compared the effectiveness of two potential CPPs, penetratin and its analog PenetraMax, as absorption enhancers for insulin. The combined effect was evaluated under in vivo oral administration conditions. Both D-forms of CPPs were highly effective for increasing the oral absorption of insulin, and D-PenetraMax showed a more rapid onset of absorption enhancement effects compared with those of D-penetratin...
2018: Biological & Pharmaceutical Bulletin
Takahide Kubota, Yusuke Ina, Zhenchao Wen, Koki Takanashi
Current perpendicular-to-plane (CPP) giant magnetoresistance (GMR) effects are of interest in a possible application of magnetic sensor elements, such as read-head of hard disk drives. To improve the junction performance, the interface tailoring effects were investigated for the Heulser alloy, Co₂Fe0.4Mn0.6Si (CFMS), based CPP-GMR junctions with an L 1 2 -Ag₃Mg ordered alloy spacer. Ultra-thin Fe or Mg inserts were utilized for the CFMS/Ag₃Mg interfaces, and CPP-GMR at low bias current density, J and the J dependence were evaluated for the junctions...
January 31, 2018: Materials
Akiva Leibowitz, Evgeni Brotfain, Leonid Koyfman, Moti Klein, Shmuel Hess, Alexander Zlotnik, Matthew Boyko
INTRODUCTION: Treatment of combined traumatic brain injury and hemorrhagic shock, poses a particular challenge due to the possible conflicting consequences. While restoring diminished volume is the treatment goal for hypovolemia, maintaining adequate cerebral perfusion pressure and avoidance of secondary damage remains a treatment goal for the injured brain. Various treatment modalities have been proposed, but the optimal resuscitation fluid and goals have not yet been clearly defined...
January 17, 2018: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
Xue-Wei Cao, Xu-Zhong Yang, Xuan Du, Long-Yun Fu, Tao-Zhu Zhang, Han-Wen Shan, Jian Zhao, Fu-Jun Wang
Cell-penetrating peptide (CPP) is used for the delivery of biomacromolecules across the cell membrane and is limited in cancer therapy due to the lack of cell selectivity. Epidermal growth factor receptor (EGFR) has been widely used in clinical targeted therapy for tumors. Here we reported a novel tumor targeting cell-penetrating peptide (TCPP), EHB (ELBD-C6H) with 20-fold and 3000-fold greater transmembrane ability and tumor cell selectivity than our previously reported S3-HBD and classic CPP TAT, respectively...
January 5, 2018: Journal of Drug Targeting
Doina Georgescu, Daniela Reisz, Camelia Vidita Gurban, Liviu Andrei Georgescu, Ioana Ionita, Oana Elena Ancusa, Daniel Lighezan
Migraine without aura is frequently reported in female patients with irritable bowel syndrome (IBS), but knowledge about the relationship between these two conditions is still lacking. This study was aimed to explore the particularities of migraine without aura in young female patients with IBS in order to establish a possible link between them. From a cohort of young female patients hospitalized with IBS in the Internal Medicine Department, 30 joined this pilot study, and they were assigned into two groups on the basis of presence or absence of migraine...
2018: Neuropsychiatric Disease and Treatment
Stephen Copplestone, Jessie Welbourne
Pressure reactivity indices are used in clinical research as a surrogate marker of the ability of the cerebrovasculature to maintain cerebral autoregulation. The use of pressure reactivity indices in patients with neurological injury represents a potential to move away from population-based physiological targets used in guidelines to individualized physiological targets. The aim of this review is to describe the underlying principles and development of pressure reactivity indices, alongside a critique of how they have been used in clinical research, including their limitations...
January 4, 2018: British Journal of Neurosurgery
Sanne A M van Lith, Dirk van den Brand, Rike Wallbrecher, Lina Wübbeke, Sander M J van Duijnhoven, Petri I Mäkinen, Janneke S Hoogstad-van Evert, Leon Massuger, Seppo Ylä-Herttuala, Roland Brock, William P J Leenders
Photodynamic therapy (PDT) is an emerging method to treat light-accessible malignancies. To increase specificity and allow dose reduction, conjugates of photosensitizers (PS) with antibodies against tumor-associated antigens have been developed for photoimmunotherapy (PIT). However, so far it is unclear whether cellular internalization of these conjugates after binding affects PIT efficacy. The use of low molecular weight llama single domain antibodies (VHHs, nanobodies) for PIT is preferred above full size antibodies because of better tumor penetration...
December 20, 2017: European Journal of Pharmaceutics and Biopharmaceutics
W Grymonpré, G Verstraete, V Vanhoorne, J P Remon, T De Beer, C Vervaet
The concept of twin-screw melt granulation (TSMG) has steadily (re)-gained interest in pharmaceutical formulation development as an intermediate step during tablet manufacturing. However, to be considered as a viable processing option for solid oral dosage forms there is a need to understand all critical sources of variability which could affect this granulation technique. The purpose of this study was to provide an in-depth analysis of the continuous TSMG process in order to expose the critical process parameters (CPP) and elucidate the impact of process and formulation parameters on the critical quality attributes (CQA) of granules and tablets during continuous TSMG...
December 14, 2017: European Journal of Pharmaceutics and Biopharmaceutics
Katia Donadello, Leonardo Gottin
No abstract text is available yet for this article.
January 2018: Minerva Anestesiologica
Jian Zhang, Xin Zhang, Yu-An Bi, Gui-Hong Xu, Wen-Zhe Huang, Zhen-Zhong Wang, Wei Xiao
The "design space" method was used to optimize the purification process of Resina Draconis phenol extracts by using the concept of "quality derived from design" (QbD). The content and transfer rate of laurin B and 7,4'-dihydroxyflavone and yield of extract were selected as the critical quality attributes (CQA). Plackett-Burman design showed that the critical process parameters (CPP) were concentration of alkali, the amount of alkali and the temperature of alkali dissolution. Then the Box-Behnken design was used to establish the mathematical model between CQA and CPP...
September 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Chitrak Gupta, Blake Mertz
Cell-penetrating peptides (CPPs) can be potentially used in targeted delivery of therapeutic cargoes. However, their conformation in solution is poorly understood. We employed molecular dynamics simulations to probe the structural fluctuations of an anionic CPP, pH Low Insertion Peptide (pHLIP), in solution to determine the effects of modifications to selected residues on the structure of pHLIP. Two types of modifications were tested: (1) protonation of aspartic acid residues and (2) point mutations known to affect the acid sensitivity of pHLIP...
November 30, 2017: ACS Omega
Jin Shup So, Jung-Ho Yun
Objective: To show the effect of dual monitoring including cardiac output (CO) and intracranial pressure (ICP) monitoring for severe traumatic brain injury (TBI) patiens. We hypothesized that meticulous treatment using dual monitoring is effective to sustain maintain minimal intensive care unit (ICU) complications and maintain optimal ICP and cerebral perfusion pressure (CPP) for severe TBI patiens. Methods: We included severe TBI, below Glasgow Coma Scale (GCS) 8 and head abbreviation injury scale (AIS) >4 and performed decompressive craniectomy at trauma ICU of our hospital...
October 2017: Korean Journal of Neurotrauma
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"