To describe critical care patients with COVID-19 across England, Wales and Northern Ireland and c... more To describe critical care patients with COVID-19 across England, Wales and Northern Ireland and compare them with a historic cohort of patients with other viral pneumonias (non-COVID-19) and with international cohorts of COVID-19. Methods: Extracted data on patient characteristics, acute illness severity, organ support and outcomes from the Case Mix Programme, the national clinical audit for adult critical care, for a prospective cohort of patients with COVID-19 (February to August 2020) are compared with a recent retrospective cohort of patients with other viral pneumonias (non-COVID-19) (2017-2019) and with other international cohorts of critical care patients with COVID-19, the latter identified from published reports. Results: 10,834 patients with COVID-19 (70.1% male, median age 60 years, 32.6% non-white ethnicity, 39.4% obese, 8.2% at least one serious comorbidity) were admitted across 289 critical care units. Of these, 36.9% had a PaO 2 /FiO 2 ratio of ≤ 13.3 kPa (≤ 100 mmHg) consistent with severe ARDS and 72% received invasive ventilation. Acute hospital mortality was 42%, higher than for 5782 critical care patients with other viral pneumonias (non-COVID-19) (24.7%), and most COVID-19 deaths (88.7%) occurred before 30 days. Meaningful international comparisons were limited due to lack of standardised reporting. Conclusion: Critical care patients with COVID-19 were disproportionately non-white, from more deprived areas and more likely to be male and obese. Conventional severity scoring appeared not to adequately reflect their acute severity, with the distribution across PaO 2 /FiO 2 ratio categories indicating acutely severe respiratory disease. Critical care patients with COVID-19 experience high mortality and place a great burden on critical care services.
Background High numbers of patients experience severe acute stress in critical care units. Acute ... more Background High numbers of patients experience severe acute stress in critical care units. Acute stress has been linked to post-critical care psychological morbidity, including post-traumatic stress disorder (PTSD). Previously, a preventive, complex psychological intervention [Psychological Outcomes following a nurse-led Preventative Psychological Intervention for critically ill patients (POPPI)] was developed by this research team, to be led by nurses, to reduce the development of PTSD symptom severity at 6 months. Objectives The objectives were to (1) standardise and refine the POPPI intervention, and, if feasible, (2) evaluate it in a cluster randomised clinical trial (RCT). Design Two designs were used – (1) two feasibility studies to test the delivery and acceptability (to patients and staff) of the intervention, education package and support tools, and to test the trial procedures (i.e. recruitment and retention), and (2) a multicentre, parallel-group, cluster RCT with a basel...
Introduction Intravenous (IV) fluid is a key intervention in the management of septic shock. The ... more Introduction Intravenous (IV) fluid is a key intervention in the management of septic shock. The benefits and harms of lower versus higher fluid volumes are unknown and clinical equipoise exists. We describe the protocol and detailed statistical analysis plan for the Conservative versus Liberal Approach to fluid therapy of Septic Shock in the Intensive Care (CLASSIC) trial. The aim of the CLASSIC trial is to assess benefits and harms of IV fluid restriction versus standard care in adult intensive care unit (ICU) patients with septic shock. Methods CLASSIC trial is an investigator-initiated, international, randomised, stratified, and analystblinded trial. We will allocate 1554 adult patients with septic shock, who are planned to be or are admitted to an ICU, to IV fluid restriction versus standard care. The primary outcome is mortality at day 90. Secondary outcomes are serious adverse events, serious adverse reactions, days alive at day 90 without life support, days alive and out of hospital at day 90, and mortality, health-related quality of life, and cognitive function at 1 year. We will conduct the statistical analyses according to a pre-defined statistical analysis plan, including three interim analyses. For the primary analysis we will use logistic regression adjusted for the stratification variables comparing the two interventions in the intention-to-treat population. Discussion The CLASSIC trial results will provide important evidence to guide clinicians' choice regarding IV fluid therapy in adults with septic shock.
Buffered intravenous fluid preparations contain substrates to maintain acid-base status. The obje... more Buffered intravenous fluid preparations contain substrates to maintain acid-base status. The objective of this systematic review was to compare the effects of buffered and non-buffered fluids administered during the perioperative period on clinical and biochemical outcomes. We searched MEDLINE, EMBASE, CINAHL and the Cochrane Library until May 2017 and included all randomised controlled trials that evaluated buffered versus non-buffered fluids, whether crystalloid or colloid, administered to surgical patients. We assessed the selected studies for risk of bias and graded the level of evidence in accordance with Cochrane recommendations. We identified 19 publications of 18 randomised controlled trials, totalling 1096 participants. Mean difference (MD) in postoperative pH was 0.05 units lower immediately following surgery in the non-buffered group (12 studies of 720 participants; 95% confidence interval (CI) 0.04 to 0.07; = 61%). This difference did not persist on postoperative day 1....
Pediatric critical care medicine : a journal of the Society of Critical Care Medicine and the World Federation of Pediatric Intensive and Critical Care Societies, Jan 7, 2018
Previous trials in adults with impaired immunity and respiratory failure suggest that early nonin... more Previous trials in adults with impaired immunity and respiratory failure suggest that early noninvasive ventilation avoids endotracheal intubation and improves survival. No randomized clinical trials have addressed this question in children. We undertook an open, parallel-group randomized trial in three pediatric hospitals. Children with impaired immunity and acute respiratory failure defined as tachypnoea (> 90th centile); a new requirement for supplemental oxygen; and new chest radiograph infiltrates. Children were randomly assigned to early PICU admission for continuous positive airways pressure (early continuous positive airways pressure) or to standard care. The primary outcome was endotracheal intubation by 30 days. One-hundred fourteen children met inclusion criteria of whom 42 were randomized between January 2013 and January 2016. There was no significant difference in endotracheal intubation by 30 days with early continuous positive airways pressure (10/21; 48%) compared...
Background: In Africa, the clinical syndrome of pneumonia remains the leading cause of morbidity ... more Background: In Africa, the clinical syndrome of pneumonia remains the leading cause of morbidity and mortality in children in the post-neonatal period. This represents a significant burden on in-patient services. The targeted use of oxygen and simple, non-invasive methods of respiratory support may be a highly cost-effective means of improving outcome, but the optimal oxygen saturation threshold that results in benefit and the best strategy for delivery are yet to be tested in adequately powered randomised controlled trials. There is, however, an accumulating literature about the harms of oxygen therapy across a range of acute and emergency situations that have stimulated a number of trials investigating permissive hypoxia. Methods: In 4200 African children, aged 2 months to 12 years, presenting to 5 hospitals in East Africa with respiratory distress and hypoxia (oxygen saturation < 92%), the COAST trial will simultaneously evaluate two related interventions (targeted use of oxyg...
To assess the epidemiology and outcome of patients with cirrhosis following critical care unit ad... more To assess the epidemiology and outcome of patients with cirrhosis following critical care unit admission. Retrospective cohort study. Critical care units in England, Wales, and Northern Ireland participating in the U.K. Intensive Care National Audit and Research Centre Case Mix Programme. Thirty-one thousand three hundred sixty-three patients with cirrhosis identified of 1,168,650 total critical care unit admissions (2.7%) admitted to U.K. critical care units between 1998 and 2012. None. Ten thousand nine hundred thirty-six patients had alcohol-related liver disease (35%). In total, 1.6% of critical care unit admissions in 1998 had cirrhosis rising to 3.1% in 2012. The crude critical care unit mortality of patients with cirrhosis was 41% in 1998 falling to 31% in 2012 (p < 0.001). Crude hospital mortality fell from 58% to 46% over the study period (p < 0.001). Mean(SD) Acute Physiology and Chronic Health Evaluation II score in 1998 was 20.3 (8.5) and 19.5 (7.1) in 2012. Mean A...
In this review, we seek to highlight how critical illness and critical care affect longer-term ou... more In this review, we seek to highlight how critical illness and critical care affect longer-term outcomes, to underline the contribution of ICU delirium to cognitive dysfunction several months after ICU discharge, to give new insights into ICU acquired weakness, to emphasize the importance of value-based healthcare, and to delineate the elements of family-centered care. This consensus of 29 also provides a perspective and a research agenda about post-ICU recovery.
To describe the incidence, characteristics and risk factors for critical care admission with seve... more To describe the incidence, characteristics and risk factors for critical care admission with severe maternal sepsis in the UK. National cohort study. 198 critical care units in the UK. 646 pregnant and recently pregnant women who had severe sepsis within the first 24 hours of admission in 2008-2010. Septic shock, mortality. Of all maternal critical care admissions, 14.4% (n=646) had severe sepsis; 10.6% (n=474) had septic shock. The absolute risk of maternal critical care admission with severe sepsis was 4.1/10 000 maternities. Pneumonia/respiratory infection (irrespective of the H1N1 pandemic influenza strain) and genital tract infection were the most common sources of sepsis (40% and 24%, respectively). We identified a significant gradient in the risk of severe maternal sepsis associated with increasing deprivation (RR=6.5; 95% CI 4.9 to 8.5 most deprived compared with most affluent women). The absolute risk of mortality was 1.8/100 000 maternities. The most common source of infec...
With improving rates of initial survival in severe sepsis, second-hit infections that occur follo... more With improving rates of initial survival in severe sepsis, second-hit infections that occur following resolution of the primary insult carry an increasing burden of morbidity. However, despite the clinical relevance of these infections, no data are available on differential outcomes in patients with first and second-hit infections depending on the nature of the causative organism. This study aims to explore any differences in these subgroups. In a retrospective, observational cohort study, the United Kingdom Intensive Care National Audit & Research Centre (ICNARC) database was used to explore the outcomes of patient with first-hit infections leading to sepsis, and sepsis patients with second-hit infections grouped according to the Gram status of the causative organism. General critical care units in England, Wales, and Northern Ireland participating in the ICNARC programme between 1 January, 2007 and 30 June, 2012. Patient groups analyzed included 2119 patients with and 1319 patient...
Using high quality clinical databases to complement the results of randomised controlled trials: ... more Using high quality clinical databases to complement the results of randomised controlled trials: the case of recombinant human activated protein C. BMJ (Clinical research ed), 323 (7318). pp. 923-6.
QJM : monthly journal of the Association of Physicians, 2009
Decisions about the intensity of treatment for patients with acute exacerbations of chronic obstr... more Decisions about the intensity of treatment for patients with acute exacerbations of chronic obstructive pulmonary disease (AECOPD) are influenced by predictions about survival and quality of life. Evidence suggests that these predictions are poorly calibrated and tend to be pessimistic. The aim of this study was to develop an outcome prediction model for COPD patients to support treatment decisions. A prospective multi-centre cohort study in Intensive Care Units (ICU) and Respiratory High Dependency Units (RHDU) in the UK recruited patients aged 45 years and older admitted with an exacerbation of obstructive lung disease. Data were collected on patients' characteristics prior to ICU admission, and on their survival and quality of life after 180 days. An outcome prediction model was developed using multivariate logistic regression and bootstrapping. Ninety-two ICUs (53% of those in the UK) and three RHDUs took part. A total of 832 patients were recruited. Cumulative 180-day morta...
The present paper describes the methods of data collection and validation employed in the Intensi... more The present paper describes the methods of data collection and validation employed in the Intensive Care National Audit & Research Centre Case Mix Programme (CMP), a national comparative audit of outcome for adult, critical care admissions. The paper also describes the case mix, outcome and activity of the admissions in the Case Mix Programme Database (CMPD). The CMP collects data on consecutive admissions to adult, general critical care units in England, Wales and Northern Ireland. Explicit steps are taken to ensure the accuracy of the data, including use of a dataset specification, of initial and refresher training courses, and of local and central validation of submitted data for incomplete, illogical and inconsistent values. Criteria for evaluating clinical databases developed by the Directory of Clinical Databases were applied to the CMPD. The case mix, outcome and activity for all admissions were briefly summarised. The mean quality level achieved by the CMPD for the 10 Direct...
This study was undertaken to determine the extent of empirical evidence on the role of organizati... more This study was undertaken to determine the extent of empirical evidence on the role of organizational factors in the critical care literature and to categorize these factors. Studies evaluating organizational factors were identified through electronic and hand searching of the critical care literature. Sixty-three publications relating to 54 different studies were identified. The studies were grouped into eight main categories: staffing, teamwork, volume and pressure of work, protocols, admission to intensive care, technology, structure, and error. Studies evaluating organizational factors exist in the critical care literature, and there is evidence that the number is increasing each year. Results indicate that organizational factors may have an impact on mortality after case mix adjustment. Some areas have been investigated more thoroughly than others and are ripe for systematic review. Variation in case mix adjusted hospital mortality after intensive care is an old theme. This stu...
To describe critical care patients with COVID-19 across England, Wales and Northern Ireland and c... more To describe critical care patients with COVID-19 across England, Wales and Northern Ireland and compare them with a historic cohort of patients with other viral pneumonias (non-COVID-19) and with international cohorts of COVID-19. Methods: Extracted data on patient characteristics, acute illness severity, organ support and outcomes from the Case Mix Programme, the national clinical audit for adult critical care, for a prospective cohort of patients with COVID-19 (February to August 2020) are compared with a recent retrospective cohort of patients with other viral pneumonias (non-COVID-19) (2017-2019) and with other international cohorts of critical care patients with COVID-19, the latter identified from published reports. Results: 10,834 patients with COVID-19 (70.1% male, median age 60 years, 32.6% non-white ethnicity, 39.4% obese, 8.2% at least one serious comorbidity) were admitted across 289 critical care units. Of these, 36.9% had a PaO 2 /FiO 2 ratio of ≤ 13.3 kPa (≤ 100 mmHg) consistent with severe ARDS and 72% received invasive ventilation. Acute hospital mortality was 42%, higher than for 5782 critical care patients with other viral pneumonias (non-COVID-19) (24.7%), and most COVID-19 deaths (88.7%) occurred before 30 days. Meaningful international comparisons were limited due to lack of standardised reporting. Conclusion: Critical care patients with COVID-19 were disproportionately non-white, from more deprived areas and more likely to be male and obese. Conventional severity scoring appeared not to adequately reflect their acute severity, with the distribution across PaO 2 /FiO 2 ratio categories indicating acutely severe respiratory disease. Critical care patients with COVID-19 experience high mortality and place a great burden on critical care services.
Background High numbers of patients experience severe acute stress in critical care units. Acute ... more Background High numbers of patients experience severe acute stress in critical care units. Acute stress has been linked to post-critical care psychological morbidity, including post-traumatic stress disorder (PTSD). Previously, a preventive, complex psychological intervention [Psychological Outcomes following a nurse-led Preventative Psychological Intervention for critically ill patients (POPPI)] was developed by this research team, to be led by nurses, to reduce the development of PTSD symptom severity at 6 months. Objectives The objectives were to (1) standardise and refine the POPPI intervention, and, if feasible, (2) evaluate it in a cluster randomised clinical trial (RCT). Design Two designs were used – (1) two feasibility studies to test the delivery and acceptability (to patients and staff) of the intervention, education package and support tools, and to test the trial procedures (i.e. recruitment and retention), and (2) a multicentre, parallel-group, cluster RCT with a basel...
Introduction Intravenous (IV) fluid is a key intervention in the management of septic shock. The ... more Introduction Intravenous (IV) fluid is a key intervention in the management of septic shock. The benefits and harms of lower versus higher fluid volumes are unknown and clinical equipoise exists. We describe the protocol and detailed statistical analysis plan for the Conservative versus Liberal Approach to fluid therapy of Septic Shock in the Intensive Care (CLASSIC) trial. The aim of the CLASSIC trial is to assess benefits and harms of IV fluid restriction versus standard care in adult intensive care unit (ICU) patients with septic shock. Methods CLASSIC trial is an investigator-initiated, international, randomised, stratified, and analystblinded trial. We will allocate 1554 adult patients with septic shock, who are planned to be or are admitted to an ICU, to IV fluid restriction versus standard care. The primary outcome is mortality at day 90. Secondary outcomes are serious adverse events, serious adverse reactions, days alive at day 90 without life support, days alive and out of hospital at day 90, and mortality, health-related quality of life, and cognitive function at 1 year. We will conduct the statistical analyses according to a pre-defined statistical analysis plan, including three interim analyses. For the primary analysis we will use logistic regression adjusted for the stratification variables comparing the two interventions in the intention-to-treat population. Discussion The CLASSIC trial results will provide important evidence to guide clinicians' choice regarding IV fluid therapy in adults with septic shock.
Buffered intravenous fluid preparations contain substrates to maintain acid-base status. The obje... more Buffered intravenous fluid preparations contain substrates to maintain acid-base status. The objective of this systematic review was to compare the effects of buffered and non-buffered fluids administered during the perioperative period on clinical and biochemical outcomes. We searched MEDLINE, EMBASE, CINAHL and the Cochrane Library until May 2017 and included all randomised controlled trials that evaluated buffered versus non-buffered fluids, whether crystalloid or colloid, administered to surgical patients. We assessed the selected studies for risk of bias and graded the level of evidence in accordance with Cochrane recommendations. We identified 19 publications of 18 randomised controlled trials, totalling 1096 participants. Mean difference (MD) in postoperative pH was 0.05 units lower immediately following surgery in the non-buffered group (12 studies of 720 participants; 95% confidence interval (CI) 0.04 to 0.07; = 61%). This difference did not persist on postoperative day 1....
Pediatric critical care medicine : a journal of the Society of Critical Care Medicine and the World Federation of Pediatric Intensive and Critical Care Societies, Jan 7, 2018
Previous trials in adults with impaired immunity and respiratory failure suggest that early nonin... more Previous trials in adults with impaired immunity and respiratory failure suggest that early noninvasive ventilation avoids endotracheal intubation and improves survival. No randomized clinical trials have addressed this question in children. We undertook an open, parallel-group randomized trial in three pediatric hospitals. Children with impaired immunity and acute respiratory failure defined as tachypnoea (> 90th centile); a new requirement for supplemental oxygen; and new chest radiograph infiltrates. Children were randomly assigned to early PICU admission for continuous positive airways pressure (early continuous positive airways pressure) or to standard care. The primary outcome was endotracheal intubation by 30 days. One-hundred fourteen children met inclusion criteria of whom 42 were randomized between January 2013 and January 2016. There was no significant difference in endotracheal intubation by 30 days with early continuous positive airways pressure (10/21; 48%) compared...
Background: In Africa, the clinical syndrome of pneumonia remains the leading cause of morbidity ... more Background: In Africa, the clinical syndrome of pneumonia remains the leading cause of morbidity and mortality in children in the post-neonatal period. This represents a significant burden on in-patient services. The targeted use of oxygen and simple, non-invasive methods of respiratory support may be a highly cost-effective means of improving outcome, but the optimal oxygen saturation threshold that results in benefit and the best strategy for delivery are yet to be tested in adequately powered randomised controlled trials. There is, however, an accumulating literature about the harms of oxygen therapy across a range of acute and emergency situations that have stimulated a number of trials investigating permissive hypoxia. Methods: In 4200 African children, aged 2 months to 12 years, presenting to 5 hospitals in East Africa with respiratory distress and hypoxia (oxygen saturation < 92%), the COAST trial will simultaneously evaluate two related interventions (targeted use of oxyg...
To assess the epidemiology and outcome of patients with cirrhosis following critical care unit ad... more To assess the epidemiology and outcome of patients with cirrhosis following critical care unit admission. Retrospective cohort study. Critical care units in England, Wales, and Northern Ireland participating in the U.K. Intensive Care National Audit and Research Centre Case Mix Programme. Thirty-one thousand three hundred sixty-three patients with cirrhosis identified of 1,168,650 total critical care unit admissions (2.7%) admitted to U.K. critical care units between 1998 and 2012. None. Ten thousand nine hundred thirty-six patients had alcohol-related liver disease (35%). In total, 1.6% of critical care unit admissions in 1998 had cirrhosis rising to 3.1% in 2012. The crude critical care unit mortality of patients with cirrhosis was 41% in 1998 falling to 31% in 2012 (p < 0.001). Crude hospital mortality fell from 58% to 46% over the study period (p < 0.001). Mean(SD) Acute Physiology and Chronic Health Evaluation II score in 1998 was 20.3 (8.5) and 19.5 (7.1) in 2012. Mean A...
In this review, we seek to highlight how critical illness and critical care affect longer-term ou... more In this review, we seek to highlight how critical illness and critical care affect longer-term outcomes, to underline the contribution of ICU delirium to cognitive dysfunction several months after ICU discharge, to give new insights into ICU acquired weakness, to emphasize the importance of value-based healthcare, and to delineate the elements of family-centered care. This consensus of 29 also provides a perspective and a research agenda about post-ICU recovery.
To describe the incidence, characteristics and risk factors for critical care admission with seve... more To describe the incidence, characteristics and risk factors for critical care admission with severe maternal sepsis in the UK. National cohort study. 198 critical care units in the UK. 646 pregnant and recently pregnant women who had severe sepsis within the first 24 hours of admission in 2008-2010. Septic shock, mortality. Of all maternal critical care admissions, 14.4% (n=646) had severe sepsis; 10.6% (n=474) had septic shock. The absolute risk of maternal critical care admission with severe sepsis was 4.1/10 000 maternities. Pneumonia/respiratory infection (irrespective of the H1N1 pandemic influenza strain) and genital tract infection were the most common sources of sepsis (40% and 24%, respectively). We identified a significant gradient in the risk of severe maternal sepsis associated with increasing deprivation (RR=6.5; 95% CI 4.9 to 8.5 most deprived compared with most affluent women). The absolute risk of mortality was 1.8/100 000 maternities. The most common source of infec...
With improving rates of initial survival in severe sepsis, second-hit infections that occur follo... more With improving rates of initial survival in severe sepsis, second-hit infections that occur following resolution of the primary insult carry an increasing burden of morbidity. However, despite the clinical relevance of these infections, no data are available on differential outcomes in patients with first and second-hit infections depending on the nature of the causative organism. This study aims to explore any differences in these subgroups. In a retrospective, observational cohort study, the United Kingdom Intensive Care National Audit & Research Centre (ICNARC) database was used to explore the outcomes of patient with first-hit infections leading to sepsis, and sepsis patients with second-hit infections grouped according to the Gram status of the causative organism. General critical care units in England, Wales, and Northern Ireland participating in the ICNARC programme between 1 January, 2007 and 30 June, 2012. Patient groups analyzed included 2119 patients with and 1319 patient...
Using high quality clinical databases to complement the results of randomised controlled trials: ... more Using high quality clinical databases to complement the results of randomised controlled trials: the case of recombinant human activated protein C. BMJ (Clinical research ed), 323 (7318). pp. 923-6.
QJM : monthly journal of the Association of Physicians, 2009
Decisions about the intensity of treatment for patients with acute exacerbations of chronic obstr... more Decisions about the intensity of treatment for patients with acute exacerbations of chronic obstructive pulmonary disease (AECOPD) are influenced by predictions about survival and quality of life. Evidence suggests that these predictions are poorly calibrated and tend to be pessimistic. The aim of this study was to develop an outcome prediction model for COPD patients to support treatment decisions. A prospective multi-centre cohort study in Intensive Care Units (ICU) and Respiratory High Dependency Units (RHDU) in the UK recruited patients aged 45 years and older admitted with an exacerbation of obstructive lung disease. Data were collected on patients' characteristics prior to ICU admission, and on their survival and quality of life after 180 days. An outcome prediction model was developed using multivariate logistic regression and bootstrapping. Ninety-two ICUs (53% of those in the UK) and three RHDUs took part. A total of 832 patients were recruited. Cumulative 180-day morta...
The present paper describes the methods of data collection and validation employed in the Intensi... more The present paper describes the methods of data collection and validation employed in the Intensive Care National Audit & Research Centre Case Mix Programme (CMP), a national comparative audit of outcome for adult, critical care admissions. The paper also describes the case mix, outcome and activity of the admissions in the Case Mix Programme Database (CMPD). The CMP collects data on consecutive admissions to adult, general critical care units in England, Wales and Northern Ireland. Explicit steps are taken to ensure the accuracy of the data, including use of a dataset specification, of initial and refresher training courses, and of local and central validation of submitted data for incomplete, illogical and inconsistent values. Criteria for evaluating clinical databases developed by the Directory of Clinical Databases were applied to the CMPD. The case mix, outcome and activity for all admissions were briefly summarised. The mean quality level achieved by the CMPD for the 10 Direct...
This study was undertaken to determine the extent of empirical evidence on the role of organizati... more This study was undertaken to determine the extent of empirical evidence on the role of organizational factors in the critical care literature and to categorize these factors. Studies evaluating organizational factors were identified through electronic and hand searching of the critical care literature. Sixty-three publications relating to 54 different studies were identified. The studies were grouped into eight main categories: staffing, teamwork, volume and pressure of work, protocols, admission to intensive care, technology, structure, and error. Studies evaluating organizational factors exist in the critical care literature, and there is evidence that the number is increasing each year. Results indicate that organizational factors may have an impact on mortality after case mix adjustment. Some areas have been investigated more thoroughly than others and are ripe for systematic review. Variation in case mix adjusted hospital mortality after intensive care is an old theme. This stu...
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Papers by Kathy Rowan