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Signa Vitae

A Journal In Intensive Care And Emergency Medicine

Tag: shock (Page 1 of 2)

How I use skeletal muscle Near Infrared Spectroscopy to non-invasively assess hemodynamic status of the critically ill

Abstract

The major goal of hemodynamic treatment is to reach adequate flow. Near infrared spectroscopy (NIRS) allows non-invasive assessment of skeletal muscle tissue oxygenation during rest and also during vascular occlusion test (VOT). VOT allows estimation of tissue oxygen extraction capability, which could be preserved (i.e. hypovolemic, obstructive and cardiogenic shock) or inappropriate (i.e. sepsis/septic shock). By using ultrasound to estimate cardiac output, arterial hemoglobin oxygen saturation, skeletal muscle NIRS, arterial lactate and hemoglobin, therapeutic goals in critically ill patients with preserved oxygen extraction capability can easily be targeted. Current controversies of NIRS technology and approach to patients with impaired oxygen extraction are discussed as well.

Key words: shock, skeletal muscle, near-infrared spectroscopy, critically ill

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Assesment of hemodynamics by basic ultrasound

Abstract

Basic ultrasound can provide important information about the main parts of the circulatory system, the heart, and the main vessels. At the bedside, only by brief visual impression of the heart function and inferior vena cava diameter, and without any measurements, the attending physician can get important information which can influence the clinical opinion-making process and the management of the hemodynamically unstable patient. No less important is to obtain information about the lungs, particularly to estimate if extravascular lung water is present in excess or not. Ultrasound can help in the detection of the potentially reversible causes of hemodynamic instability or arrest and can guide the treatment. Examples are pneumothorax, cardiac tamponade, thromboembolism, the detection of blood in the pleural, pericardial or abdominal space after trauma and the detection and treatment of the source of the infection.

Key words: ultrasound, hemodynamic monitoring, shock

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Near infrared spectroscopy for evaluation of skeletal muscle tissue oxygenation in different types of shock

Abstract

Clinical examination is non-invasive, but has well-recognized limitations in detecting compensated and uncompensated low flow states and their severity.

This paper describes the principles of near infra-red spectroscopy (NIRS) and the basis for its proposed use, in hypovolaemic, cardiogenic and septic shock, for assessing global and regional tissue oxygenation. The vascular occlusion test is explained. Limitations of NIRS, current controversies, and what is necessary in the future to make this technology a part of the initial and ongoing assessment of a patient, are discussed as well. The ultimate goal of such techniques is to prevent miss-assessment and inadequate resuscitation of patients, two major initiators in the development of multisystem organ failure and death.

Key words: shock, skeletal muscle, near-infrared spectroscopy

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Decreasing mortality with drotrecogin alfa in high risk septic patients A meta-analysis of randomized trials in adult patients with multiple organ failure and mortality >40%

Abstract

Objective. Sepsis is a complex inflammatory disease, rising in response to infection. Drotrecogin alfa, approved in 2001 for severe sepsis, has been withdrawn from the market. The aim of this study was to assess if drotrecogin alfa-activated can reduce mortality in the more severe septic patients.

Methods. We searched PubMed, Embase, Scopus, BioMedCentral, and in Clinicaltrials. gov databases to identify every randomized study performed on drotrecogin alfa-activated in any clinical setting in humans, without restrictions on dose or time of administration. Our primary end-point was mortality rate in high risk patients. Secondary endpoints were mortality in all patients, in patients with an Acute Physiology and Chronic Health Evaluation (APACHE) 2 score ≥ 25 and in those with an APACHE 2 score ≤25.

Results. Five trials were identified and included in the analysis. They randomized 3196 patients to drotrecogin alfa and 3111 to the control group. Drotrecogin alfa was associated with a reduction in mortality (99/263 [37.6%] vs 115/244 [47.1%], risk ratios (RR) = 0.80[0.65; 0.98], p = 0.03) in patients with multiple organ failure and a mortality risk in the control group of >40%, but not in the overall population or in lower risk populations.

Conclusions. In high risk populations of patients with multiple organ failure and a mortality of >40% in the control group, Drotrecogin alfa may still have a role as a lifesaving treatment. No beneficial effect in low risk patients was found. An individual patient meta-analysis including all randomized controlled trial on sepsis is warranted, along with new studies on similar drugs such as protein C zymogen.

Key words: sepsis, shock, intensive care, critically ill, mortality, drotrecogin alfa, recombinant human activated protein C

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Pediatric Shock

Abstract

Millions of children die of shock due to various etiologies each year. Shock is a state of circulatory dysfunction where the metabolic demands of the tissue cannot be met by the circulation. Several different etiologies from hypovolemia to severe infection can result in shock. This review focuses on the definition of different types of shock seen in children and summarizes treatment strategies for the acute care practitioner based on pertinent recent literature. Early recognition and timely intervention are critical for successful treatment of pediatric shock. A strong index of suspicion by the treating clinician and early fluid resuscitation followed by ongoing assessment and timely transfer to a higher level of care can make the difference between life and death for the child who presents in shock.

Key words: shock, child, etiology, treatment

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