618 research outputs found
An investigation into the effects of commencing haemodialysis in the critically ill
<b>Introduction:</b>
We have aimed to describe haemodynamic changes when haemodialysis is instituted in the critically ill. 3
hypotheses are tested: 1)The initial session is associated with cardiovascular instability, 2)The initial session is
associated with more cardiovascular instability compared to subsequent sessions, and 3)Looking at unstable
sessions alone, there will be a greater proportion of potentially harmful changes in the initial sessions compared
to subsequent ones.
<b>Methods:</b>
Data was collected for 209 patients, identifying 1605 dialysis sessions. Analysis was performed on hourly
records, classifying sessions as stable/unstable by a cutoff of >+/-20% change in baseline physiology
(HR/MAP). Data from 3 hours prior, and 4 hours after dialysis was included, and average and minimum values
derived. 3 time comparisons were made (pre-HD:during, during HD:post, pre-HD:post). Initial sessions were
analysed separately from subsequent sessions to derive 2 groups. If a session was identified as being unstable,
then the nature of instability was examined by recording whether changes crossed defined physiological ranges.
The changes seen in unstable sessions could be described as to their effects: being harmful/potentially harmful,
or beneficial/potentially beneficial.
<b>Results:</b>
Discarding incomplete data, 181 initial and 1382 subsequent sessions were analysed. A session was deemed to
be stable if there was no significant change (>+/-20%) in the time-averaged or minimum MAP/HR across time
comparisons. By this definition 85/181 initial sessions were unstable (47%, 95% CI SEM 39.8-54.2). Therefore
Hypothesis 1 is accepted. This compares to 44% of subsequent sessions (95% CI 41.1-46.3). Comparing these
proportions and their respective CI gives a 95% CI for the standard error of the difference of -4% to 10%.
Therefore Hypothesis 2 is rejected. In initial sessions there were 92/1020 harmful changes. This gives a
proportion of 9.0% (95% CI SEM 7.4-10.9). In the subsequent sessions there were 712/7248 harmful changes.
This gives a proportion of 9.8% (95% CI SEM 9.1-10.5). Comparing the two unpaired proportions gives a
difference of -0.08% with a 95% CI of the SE of the difference of -2.5 to +1.2. Hypothesis 3 is rejected. Fisher’s
exact test gives a result of p=0.68, reinforcing the lack of significant variance.
<b>Conclusions:</b>
Our results reject the claims that using haemodialysis is an inherently unstable choice of therapy. Although
proportionally more of the initial sessions are classed as unstable, the majority of MAP and HR changes are
beneficial in nature
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Low Serum 25-Hydroxyvitamin D Levels and Acute Kidney Injury in the Critically Ill
Book of Abstracts of MICROBIOTEC09
Sítio da conferência: http://www.deb.uminho.pt/microbiotec09/This book contains the abstracts presented at the 3rd joint meeting of the Portuguese Society of
Microbiology and The Portuguese Society of Biotechnology - MicroBiotec09, held in Vilamoura, Portugal,
over 3 days, from the 28th to the 30th of November, 2009. MicroBiotec09 comes in the sequence of
previous conferences organized by each society, since 1982, date of the I Encontro Nacional de
Biotecnologia (Lisbon), till 2005, date of the first joint meeting - MICRO'05 + BIOTEC'05 (Póvoa de
Varzim). Following this joint meeting, another - MICRO 07 + BIOTEC 07 + XXIII JPG took place in Lisbon
(2007).
MicroBiotec09 is a joint organization of “Sociedade Portuguesa de Biotecnologia”, “Sociedade Portuguesa
de Microbiologia”, Institute for Biotechnology and Bioengineering (Universidade do Minho –
Departamento de Engenharia Biológica) and Centro de Recursos Microbiológicos (Universidade Nova de
Lisboa, Faculdade de Ciências e Tecnologia – Departamento de Ciências da Vida).
MicroBiotec09 brings together both young and established researchers and end users to discuss recent
developments in different areas of Biotechnology and Microbiology. The conference program has thus
been divided in 8 major sessions: Microbial Physiology, Molecular Biology and Functional Genomics; Cell
and Tissue Engineering, Biomaterials and Nanobiotechnologies; Clinical Microbiology and Epidemiology;
Environmental Microbiology and Biotechnology; Health and Pharmaceutical Biotechnology; Cellular
Microbiology and Pathogenesis; Industrial and Food Microbiology and Biotechnology; Bioinformatics,
Comparative Genomics and Evolution.
A special session to celebrate the 200th anniversary of Charles Darwin's birth and the 150th anniversary of
the publication of his landmark work “On the Origin of Species by Means of Natural Selection” will also
take place.
A total of 295 abstracts are included in the book, consisting of 6 invited lecturers, 10 oral presentations
and 44 short oral presentations given in 3 parallel sessions, along with 4 slots for viewing poster
presentations. All abstracts have been reviewed and we are grateful to the members of scientific and
organizing committees for their evaluations. It was an intensive task since 328 submitted abstracts were
received.
It has been an honor for us to contribute to setting up MicroBiotec09 during an intensive period of 6
months. We wish to thank the authors who have contributed to yield a high scientific standard to the
program. We are thankful to the sponsors who have contributed decisively to this event. We also extend
our gratefulness to all those who, through their dedicated efforts, have assisted us in this task.
On behalf of the Scientific and Organizing Committees we wish you that together with an interesting reading, the scientific program and the social moments organized will be memorable for all.Fundação para a Ciência e a Tecnologia (FCT
Variability of insulin sensitivity during the first 4 days of critical illness
1-pageSafe, effective tight glycaemic control (TGC) can improve outcomes in critical care patients, but is difficult to achieve consistently. Insulin sensitivity defines the metabolic balance between insulin concentration and insulin mediated glucose disposal. Hence, variability of insulin sensitivity can cause variable glycaemia. This study investigates the daily evolution of model-based insulin sensitivity level and variability for critical care patients receiving TGC during the first four days of their ICU stay
Activated protein C, severe sepsis and 28-day mortality
Protein C (PC) de ciency is prevalent in severe sepsis, studies showing that more than 80% of patients with severe sepsis
have a baseline PC level below the lower limit of normal [1,2]. The aim of the study was to relate the anticoagulation activity evaluated by PC, with clinical parameters and 28-day mortality.Ye
Delayed discharges revisited: impact of a liaison post on patients' transition from ICU to ward care
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