Andrew Levinson

Reducing mortality in severe sepsis and septic shock.

Severe sepsis is one of the most common reasons for critically ill patients to be admitted to an intensive care unit (ICU) and has very high associated morbidity and mortality. The Surviving Sepsis Campaign was initiated with the hope that mortality might be reduced by standardizing care informed by data from an increasing number of clinical trials. Important methods for reducing mortality identified by recent studies include aggressive fluid resuscitation, early goal-directed therapy (EGDT), early administration of antibiotics, and the administration of activated protein C to eligible patients.

Combination Therapy for the Treatment of Pulmonary Arterial Hypertension

Multiple medical therapies have been developed for the treatment of pulmonary arterial hypertension (PAH) over the last decade and a half. Unfortunately, none of these medications is curative and the majority of patients develop disease progression despite treatment. Presently available medications target one of three known pathways that have been implicated in disease pathogenesis. The multiplicity of pulmonary vascular abnormalities identified in PAH provides the rationale for a therapeutic strategy that targets more than one mechanism at a time. Although a handful of studies have demonstrated clinical improvement in PAH patients who have a second medication added to stable background therapy in a randomized, placebo-controlled fashion, it is unclear whether the derived benefit is due to the combination of two therapies or merely the response to the new agent. This review discusses the rationale for combination therapy, critically reviews the findings of presently completed combination studies and outlines the need for new studies that are better designed to determine whether combination therapy is more efficacious than single agent therapies for the treatment of PAH.

Inferior vena cava collapsibility detects fluid responsiveness among spontaneously breathing critically-ill patients

Purpose: Measurement of inferior vena cava collapsibility (cIVC) by point‐of‐care ultrasound (POCUS) has been proposed as a viable, non‐invasive means of assessing fluid responsiveness. We aimed to determine the ability of cIVC to identify patients who will respond to additional intravenous fluid (IVF) administration among spontaneously breathing critically‐ill patients. Methods: Prospective observational trial of spontaneously breathing critically‐ill patients. cIVC was obtained 3 cm caudal from the right atrium and IVC junction using POCUS. Fluid responsiveness was defined as a ≥ 10% increase in cardiac index following a 500 ml IVF bolus; measured using bioreactance (NICOM™, Cheetah Medical). cIVC was compared with fluid responsiveness and a cIVC optimal value was identified. Results: Of the 124 participants, 49% were fluid responders. cIVC was able to detect fluid responsiveness: AUC = 0.84 [0.76, 0.91]. The optimum cutoff point for cIVC was identified as 25% (LR + 4.56 [2.72, 7.66], LR‐ 0.16 [0.08, 0.31]). A cIVC of 25% produced a lower misclassification rate (16.1%) for determining fluid responsiveness than the previous suggested cutoff values of 40% (34.7%). Conclusion: IVC collapsibility, as measured by POCUS, performs well in distinguishing fluid responders from non‐responders, and may be used to guide IVF resuscitation among spontaneously breathing critically‐ill patients. HIGHLIGHTSIVC collapsibility, as measured by POCUS, is able to detect fluid responsiveness.Use of a passive leg raise did not improve detection of fluid responsiveness.The optimum cutoff point for IVC collapsibility is cIVC = 25%.cIVC, measured by POCUS may be used to direct fluid resuscitation.

Performance of the Obstetric Early Warning Score in critically ill patients for the prediction of maternal death

BACKGROUND: Every day, about 830 women die worldwide from preventable causes related to pregnancy and childbirth. Obstetric early warning scores have been proposed as a potential tool to reduce maternal morbidity and mortality, based on the identification of predetermined abnormal values in the vital signs or laboratory parameters, to generate a rapid and effective medical response. Several early warning scores have been developed for obstetrical patients, but the majority are the result of a clinical consensus rather than statistical analyses of clinical outcome measures (ie, maternal deaths). In 2013, the Intensive Care National Audit and Research Center Case Mix Program reported the first statistically validated early warning scoring system for pregnant women. OBJECTIVE: We sought to assess the performance of the Intensive Care National Audit and Research Center Obstetric Early Warning Score in predicting death among pregnant women who required admission to the intensive care unit. STUDY DESIGN: This retrospective cohort study included pregnant women admitted to the intensive care unit at a tertiary referral center from January 2006 through December 2011 in Colombia, a developing country, with direct and indirect obstetric‐related conditions. The Obstetric Early Warning Score was calculated based on data collected during the first 24 hours of intensive care unit admission. The Obstetric Early Warning Score is calculated based on values of the following variables: systolic and diastolic blood pressure, respiratory rate, heart rate, fraction of inspired oxygen (FiO2) required to maintain an oxygen saturation ≥96%, temperature, and level of consciousness. The performance of the Obstetric Early Warning Score was evaluated using the area under the receiver operator characteristic curve. Outcomes selected were: maternal death, need for mechanical ventilation, and/or vasoactive support. Statistical methods included distribution appropriate univariate analyses and multivariate logistic regression. RESULTS: During the study period, 50,897 births were recorded. There were 724 obstetric admissions to critical care, for an intensive care unit admission rate of 14.22 per 1000 deliveries. A total of 702 women were included in the study, with 29 (4.1%) maternal deaths, and a mortality ratio of 56.98 deaths per 100,000 live births. The most frequent causes of admission were direct, obstetric‐related conditions (n = 534; 76.1%). The Obstetric Early Warning Score value was significantly higher in nonsurvivors than in survivors [12 (interquartile range 10‐13) vs 7 (interquartile range 4‐9); P < .001]. Peripartum women with normal values of Obstetric Early Warning Score had 0% mortality rate, while those with high Obstetric Early Warning Score values (>6) had a mortality rate of 6.3%. The area under the receiver operator characteristic curve of the Obstetric Early Warning Score in discrimination of maternal death was 0.84 (95% confidence interval, 0.75–0.92). The overall predictive value of the Obstetric Early Warning Score was better when the main cause of admission was directly related to pregnancy or the postpartum state. The area under the receiver operator characteristic curve of the score in conditions directly related to pregnancy and postpartum was 0.87 (95% confidence interval, 0.79–0.95), while in indirectly related conditions the area under the receiver operator characteristic curve was 0.77 (95% confidence interval, 0.58–0.96). CONCLUSION: Although there are opportunities for improvement, Obstetric Early Warning Score obtained upon admission to the intensive care unit can predict survival in conditions directly related to pregnancy and postpartum. The use of early warning scores in obstetrics may be a highly useful approach in the early identification of women at an increased risk of dying.

Maternal mortality due to pandemic influenza A H1N1 2009 virus in Colombia

Abstract Aims: The 2009 H1N1 pandemic illustrated the higher morbidity and mortality from viral infections in peripartum women. We describe clinical features of women who recently died of H1N1 in Colombia. Methods: This is a case series study that was gathered through a retrospective record review of all maternal H1N1 deaths in the country. The national mortality database of confirmed mortality from H1N1 in pregnancy and up to 42 days after delivery was reviewed during the H1N1 season in 2009. Women with H1N1 infections were confirmed by the laboratory of virology. Demographic, clinical, and laboratory data were reviewed. Statistical analyses were performed and median values of non-parametric data were reported with inter-quartile range (IQR). Results: A total of 23 H1N1 maternal deaths were identified. Eighty-three percent occurred in the third trimester. None of the mothers who died had received influenza vaccination. The median time from symptom onset to the initiation of antiviral treatment was 8.8 days (IQR 5.8–9.8). Five fatalities did not receive any anti-viral therapy. Median PaO2/FiO2 on day 1 was 80 (IQR, 60–98.5). All patients required inotropic support and mechanical ventilation with barotrauma-related complications of mechanical ventilation occurring in 35% of patients. Conclusion: In Colombia, none of the women suffering H1N1-related maternal deaths had received vaccination against the disease and most had delayed or had no anti-viral therapy. Given the lack of evidence-based clinical predictors to identify women who are prone to die from H1N1 in pregnancy, following international guidelines for vaccination and initiation of antiviral therapy in suspected cases would likely improve outcomes in developing countries.

Arterial Catheter Use in the ICU: A National Survey of Antiseptic Technique and Perceived Infectious Risk.

Objectives: Recent studies have shown that the occurrence rate of bloodstream infections associated with arterial catheters is 0.9–3.4/1,000 catheter-days, which is comparable to that of central venous catheters. In 2011, the Centers for Disease Control and Prevention published new guidelines recommending the use of limited barrier precautions during arterial catheter insertion, consisting of sterile gloves, a surgical cap, a surgical mask, and a small sterile drape. The goal of this study was to assess the attitudes and current infection prevention practices used by clinicians during insertion of arterial catheters in ICUs in the United States. Design: An anonymous, 22-question web-based survey of infection prevention practices during arterial catheter insertion. Setting: Clinician members of the Society of Critical Care Medicine. Subjects: Eleven thousand three hundred sixty-one physicians, nurse practitioners, physician assistants, respiratory therapists, and registered nurses who elect to receive e-mails from the Society of Critical Care Medicine. Interventions: None. Measurements and Main Results: There were 1,265 responses (11% response rate), with 1,029 eligible participants after exclusions were applied. Only 44% of participants reported using the Centers for Disease Control and Prevention–recommended barrier precautions during arterial catheter insertion, and only 15% reported using full barrier precautions. The mean and median estimates of the incidence density of bloodstream infections associated with arterial catheters were 0.3/1,000 catheter-days and 0.1/1,000 catheter-days, respectively. Thirty-nine percent of participants reported that they would support mandatory use of full barrier precautions during arterial catheter insertion. Conclusions: Barrier precautions are used inconsistently by critical care clinicians during arterial catheter insertion in the ICU setting. Less than half of clinicians surveyed were in compliance with current Centers for Disease Control and Prevention guidelines. Clinicians significantly underestimated the infectious risk posed by arterial catheters, and support for mandatory use of full barrier precautions was low. Further studies are warranted to determine the optimal preventive strategies for reducing bloodstream infections associated with arterial catheters.

Lithium toxicity after Roux-en-Y bariatric surgery

A 61-year-old woman with medical history significant for morbid obesity, type II diabetes mellitus, nephrogenic diabetes insipidus and bipolar disorder, had been stable on lithium carbonate therapy for several years. She had undergone a Roux-en-Y bypass surgery and, at the time of her surgery, her lithium level was found to be 0.61 mEq/L on a maintenance dose of 600 mg orally twice per day. She was discharged 8 days postoperatively on the same lithium dose, but presented to the emergency department 12 days postoperatively with signs of lithium toxicity. Her lithium level was elevated to 1.51 mEq/L and she was treated for lithium toxicity with supportive care and, ultimately, reduction of her lithium dose. Clinicians should be aware that dramatic and poorly understood changes in drug absorption may occur after bariatric surgery.

Peripheral arterial catheter colonization in cardiac surgical patients

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Predictors of Maternal Mortality and Prognostic Models in Obstetric Patients

Abstract The use of predictive models has been proposed as a potential tool to reduce maternal morbidity and mortality, by aiding in the timely identification of potential high‐risk patients. Prognostic models in critical care have been used to characterize the severity of illness of specific diseases. Physiological changes in pregnancy may result in general critical illness prediction models overestimating mortality in obstetric patients. Models that specifically reflect the unique characteristics of obstetric patients may have better prognostic value. Recently developed tools have focused on identifying at‐risk patients before they require intensive care unit (ICU) admission to target early interventions and prevent acute clinical decompensation. The aim of the newest scoring systems, specifically designed for groups of obstetric patients receiving non‐ICU care, is to reduce maternal morbidity and mortality by identifying early high‐risk patients and initiating prompt effective medical responses.

308: IVC COLLAPSIBILITY SHOWS PROMISE IN DETECTING FLUID RESPONSIVENESS AMONG CRITICALLY ILL PATIENTS

Crit Care Med 2016 • Volume 44 • Number 12 (Suppl.) 95% CI, 1.023–1.105; p=0.002), and continuous NMB requirement (HR, 0.636; 95% CI, 0.422–0.957; p=0.030) compared to no NMB were associated with six-month mortality. However, the serum lactate level (p=0.658) and lactate clearance (p=0.440) were not different among NMB groups. Conclusions: Continuous NMB requirement rather than no NMB was associated with six-month survival in cardiac arrest survivors treated with TH. The method of NMB use was not associated with serum lactate level and lactate clearance.