Hypotension during intensive care stay and mortality and morbidity: a systematic review and meta-analysis.

PURPOSE: The aim of this study is to provide a summary of the existing literature on the association between hypotension during intensive care unit (ICU) stay and mortality and morbidity, and to assess whether there is an exposure-severity relationship between hypotension exposure and patient outcomes. METHODS: CENTRAL, Embase, and PubMed were searched up to October 2022 for articles that reported an association between hypotension during ICU stay and at least one of the 11 predefined outcomes. Two independent reviewers extracted the data and assessed the risk of bias. Results were gathered in a summary table and studies designed to investigate the hypotension-outcome relationship were included in the meta-analyses. RESULTS: A total of 122 studies (176,329 patients) were included, with the number of studies varying per outcome between 0 and 82. The majority of articles reported associations in favor of 'no hypotension' for the outcomes mortality and acute kidney injury (AKI), and the strength of the association was related to the severity of hypotension in the majority of studies. Using meta-analysis, a significant association was found between hypotension and mortality (odds ratio: 1.45; 95% confidence interval (CI) 1.12-1.88; based on 13 studies and 34,829 patients), but not for AKI. CONCLUSION: Exposure to hypotension during ICU stay was associated with increased mortality and AKI in the majority of included studies, and associations for both outcomes increased with increasing hypotension severity. The meta-analysis reinforced the descriptive findings regarding mortality but did not yield similar support for AKI.

Effect of the machine learning-derived Hypotension Prediction Index (HPI) combined with diagnostic guidance versus standard care on depth and duration of intraoperative and postoperative hypotension in elective cardiac surgery patients: HYPE-2 - study protocol of a randomised clinical trial.

INTRODUCTION: Hypotension is common during cardiac surgery and often persists postoperatively in the intensive care unit (ICU). Still, treatment is mainly reactive, causing a delay in its management. The Hypotension Prediction Index (HPI) can predict hypotension with high accuracy. Using the HPI combined with a guidance protocol resulted in a significant reduction in the severity of hypotension in four non-cardiac surgery trials. This randomised trial aims to evaluate the effectiveness of the HPI in combination with a diagnostic guidance protocol on reducing the occurrence and severity of hypotension during coronary artery bypass grafting (CABG) surgery and subsequent ICU admission. METHODS AND ANALYSIS: This is a single-centre, randomised clinical trial in adult patients undergoing elective on-pump CABG surgery with a target mean arterial pressure of 65 mm Hg. One hundred and thirty patients will be randomly allocated in a 1:1 ratio to either the intervention or control group. In both groups, a HemoSphere patient monitor with embedded HPI software will be connected to the arterial line. In the intervention group, HPI values of 75 or above will initiate the diagnostic guidance protocol, both intraoperatively and postoperatively in the ICU during mechanical ventilation. In the control group, the HemoSphere patient monitor will be covered and silenced. The primary outcome is the time-weighted average of hypotension during the combined study phases. ETHICS AND DISSEMINATION: The medical research ethics committee and the institutional review board of the Amsterdam UMC, location AMC, the Netherlands, approved the trial protocol (NL76236.018.21). No publication restrictions apply, and the study results will be disseminated through a peer-reviewed journal. TRIAL REGISTRATION NUMBER: The Netherlands Trial Register (NL9449), ClinicalTrials.gov (NCT05821647).

Feasibility of continuous non-invasive finger blood pressure monitoring in adult patients admitted to an intensive care unit: A retrospective cohort study.

BACKGROUND: Arterial catheters are often used for blood pressure monitoring in the intensive care unit (ICU), but they can cause complications. Non-invasive continuous finger blood pressure monitors could serve as an alternative. However, failure to obtain finger blood pressure signals is reported in up to 12% of ICU patients. OBJECTIVES: Our primary objective was to identify the success rate of finger blood pressure monitoring in ICU patients. Secondary objectives were to assess whether patient admission characteristics could be used to identify patients unsuitable for non-invasive blood pressure monitoring and to determine the quality of non-invasive blood pressure waveforms. METHODS: Retrospective observational study conducted in a cohort of 499 ICU patients. When available, the signal quality of the first hour of finger measurement was determined using an open-source waveform algorithm. RESULTS: Finger blood pressure signals were obtained in 94% of patients. These patients had a high quality blood pressure waveform for 84% of the measurement time. Patients without a finger blood pressure signal significantly more frequently had a history of kidney and vascular disease, were more often treated with inotropic agents, had lower hemoglobin levels, and had higher arterial lactate levels. CONCLUSIONS: Finger blood pressure signals were obtained in nearly all ICU patients. Significant differences in baseline characteristics between patients with and without finger blood pressure signals were found, but they were not clinically relevant. The characteristics studied could therefore not be used to identify patients unsuitable for finger blood pressure monitoring.

Incidence, Severity and Clinical Factors Associated with Hypotension in Patients Admitted to an Intensive Care Unit: A Prospective Observational Study.

Background: The majority of patients admitted to the intensive care unit (ICU) experience severe hypotension which is associated with increased morbidity and mortality. At present, prospective studies examining the incidence and severity of hypotension using continuous waveforms are missing. Methods: This study is a prospective observational cohort study in a mixed surgical and non-surgical ICU population. All patients over 18 years were included and continuous arterial pressure waveforms data were collected. Mean arterial pressure (MAP) below 65 mmHg for at least 10 s was defined as hypotension and a MAP below 45 mmHg as severe hypotension. The primary outcome was the incidence of hypotension. Secondary outcomes were the severity of hypotension expressed in time-weighted average (TWA), factors associated with hypotension, the number and duration of hypotensive events. Results: 499 patients were included. The incidence of hypotension (MAP < 65 mmHg) was 75% (376 out of 499) and 9% (46 out of 499) experienced severe hypotension. Median TWA was 0.3 mmHg [0−1.0]. Associated clinical factors were age, male sex, BMI and cardiogenic shock. There were 5 (1−12) events per patients with a median of 52 min (5−170). Conclusions: In a mixed surgical and non-surgical ICU population the incidence of hypotension is remarkably high.

Making complex decisions in uncertain times: experiences of Dutch GPs as gatekeepers regarding hospital referrals during COVID-19-a qualitative study.

BACKGROUND: General practitioners often act as gatekeeper, authorizing patients' access to hospital care. This gatekeeping role became even more important during the current COVID-19 crisis as uncertainties regarding COVID-19 made estimating the desirability of hospital referrals (for outpatient or inpatient hospitalization) complex, both for COVID and non-COVID suspected patients. This study explored Dutch general practitioners' experiences and ethical dilemmas faced in decision making about hospital referrals in times of the COVID-19 pandemic. METHODS: Semi-structured interviews with Dutch general practitioners working in the Netherlands were conducted. Participants were recruited via purposive sampling. Thematic analysis was conducted using content coding. RESULTS: Fifteen interviews were conducted, identifying four themes: one overarching regarding (1) COVID-19 uncertainties, and three themes about experienced ethical dilemmas: (2) the patients' self-determination vs. the general practitioners' paternalism, (3) the general practitioners' duty of care vs. the general practitioners' autonomy rights, (4) the general practitioners' duty of care vs. adequate care provision. CONCLUSIONS: Lack of knowledge about COVID-19, risks to infect loved ones, scarcity of hospital beds and loneliness of patients during hospital admission were central in dilemmas experienced. When developing guidelines for future crises, this should be taken into account.

Euthanasia in advanced dementia; the view of the general practitioners in the Netherlands on a vignette case along the juridical and ethical dispute.

BACKGROUND: In the Netherlands, euthanasia has been regulated by law since 2002. In the past decade, a growing number of persons with dementia requested for euthanasia, and more requests were granted. A euthanasia request from a patient with advanced dementia (PWAD) can have a major impact on a general practitioner (GP). We aimed to get insights in the views of Dutch GPs on euthanasia concerning this patient group. METHODS: A postal survey was sent to 894 Dutch GPs. Questions were asked about a case vignette about a PWAD who was not able to confirm previous wishes anymore. Quantitative data were analyzed with descriptive statistics. RESULTS: Of the 894 GPs approached, 422 (47.3%) completed the survey. One hundred seventy-eight GPs (42.2%) did not agree with the statement that an Advance Euthanasia Directive (AED) can replace an oral request if communication with the patient concerned has become impossible. About half of the respondents (209; 49.5%) did not agree that the family can initiate a euthanasia trajectory, 95 GPs (22.5%) would accept such a family initiative and 110 GPs (26.1%) would under certain conditions. DISCUSSION: In case of a PWAD, when confirming previous wishes is not possible anymore, about half of the Dutch GPs would not accept an AED to replace verbal or non-verbal conformation nor consider performing euthanasia; a minority would. Our study shows that, probably due to the public debate and changed professional guidelines, conflicting views have arisen among Dutch GPs about interpretation of moral, ethical values considering AED and PWADs.

The COVID-19 pandemic: A tipping point for advance care planning? Experiences of general practitioners.

BACKGROUND: In 2020, the COVID-19 pandemic caused an acute risk of deterioration and dying for many, and an urgent need to start advance care planning. AIM: To explore how general practitioners (GPs) experienced discussing values, goals and preferences with patients during COVID-19. DESIGN AND SETTING: Qualitative research in general practice. METHODS: Semi-structured interviews for which Dutch GPs were recruited via purposive sampling. Content analysis was used. RESULTS: Fifteen GPs were interviewed. Six themes were identified: (i) urge of advance care planning, (ii) the GP's perceived role in it, (iii) preparations for it, (iv) (proactively) discussing it, (v) essentials for good communication and (vi) advance care planning in the (near) future. Calls for proactively discussing advance care planning in the media and in COVID-guidelines caused awareness of it's importance. GPs envisaged an important role for themselves in initiating it, especially with patients at risk to deteriorate or die from COVID-19. Timing advance care planning appeared difficult but crucial. The recommended digital way of communication was considered problematic due to missing nonverbal communication and difficulties in involving relatives. It was noted that admission to the ICU, which was hardly discussed before the COVID-19 pandemic, should remain a topic during advance care planning. CONCLUSION: The COVID-19 pandemic brought advance care planning into a new light, GPs were more experienced with discussing it and patients were more aware of their frailty. Because of the nearing 'grey wave', advance care planning should remain top priority. Therefore, it should be central in GP and post-academic training.

Machine learning methods for perioperative anesthetic management in cardiac surgery patients: a scoping review.

BACKGROUND: Machine learning (ML) is developing fast with promising prospects within medicine and already has several applications in perioperative care. We conducted a scoping review to examine the extent and potential limitations of ML implementation in perioperative anesthetic care, specifically in cardiac surgery patients. METHODS: We mapped the current literature by searching three databases: MEDLINE (Ovid), EMBASE (Ovid), and Cochrane Library. Articles were eligible if they reported on perioperative ML use in the field of cardiac surgery with relevance to anesthetic practices. Data on the applicability of ML and comparability to conventional statistical methods were extracted. RESULTS: Forty-six articles on ML relevant to the work of the anesthesiologist in cardiac surgery were identified. Three main categories emerged: (I) event and risk prediction, (II) hemodynamic monitoring, and (III) automation of echocardiography. Prediction models based on ML tend to behave similarly to conventional statistical methods. Using dynamic hemodynamic or ultrasound data in ML models, however, shifts the potential to promising results. CONCLUSIONS: ML in cardiac surgery is increasingly used in perioperative anesthetic management. The majority is used for prediction purposes similar to conventional clinical scores. Remarkable ML model performances are achieved when using real-time dynamic parameters. However, beneficial clinical outcomes of ML integration have yet to be determined. Nonetheless, the first steps introducing ML in perioperative anesthetic care for cardiac surgery have been taken.

Dutch GPs' experience of burden by euthanasia requests from people with dementia: a quantitative survey.

BACKGROUND: In the Netherlands during the past decade, a growing number of people with dementia requested euthanasia, and each year more of such requests were granted. AIM: To obtain quantitative insights into the problems and needs of GPs when confronted with a euthanasia request by a person with dementia. DESIGN & SETTING: A concept survey was composed for GPs in the Netherlands. Expert validity of the survey was achieved through pilot testing. METHOD: A postal survey was sent to a random sample of 900 Dutch GPs, regardless of their opinion on, or practical experience with, euthanasia. Collected data were analysed with descriptive statistics. RESULTS: Of 894 GPs, 423 (47.3%) completed the survey, of whom 176 (41.6%) had experience with euthanasia requests from people with dementia. Emotional burden was reported most frequently (n = 86; 52.8%), as well as feeling uncertain about the mental competence of the person with dementia (n = 77; 47.2%), pressure by relatives (n = 70; 42.9%) or the person with dementia (n = 56; 34.4%), and uncertainty about handling advance euthanasia directives (AEDs) (n = 43; 26.4%). GPs would appreciate more support from the following: a support and consultation in euthanasia in the Netherlands (SCEN) physician (an independent physician for support, information, and formal consultation around euthanasia) (n = 291; 68. 8%); a geriatric consultation team (n = 185; 43.7%); the end-of-life clinic (n = 184; 43.5%); or a palliative care consultation team (n = 179; 42.3%). Surprisingly the need for moral deliberation was hardly mentioned. CONCLUSION: The reported burden and the rise in numbers and complexity of euthanasia requests from people with dementia warrants primary care support. There needs to be easier access to colleagues with expertise, and training on end-of-life care needs of patients with dementia and their caregivers.

Supporting GPs around euthanasia requests from people with dementia: a qualitative analysis of Dutch nominal group meetings.

BACKGROUND: Euthanasia has been regulated by law under strict conditions in the Netherlands since 2002. Since then the number of euthanasia cases has constantly increased, and increased exponentially for patients with dementia (PWD). The number of euthanasia requests by such patients is even higher. Recently, an interview study showed that physicians who are confronted with a PWD's euthanasia request experience problems with communication, pressure from relatives, patients, and society, workload, interpretation of the law, and ethical considerations. Moreover, if honoured, the physician and patient may interpret the right moment for euthanasia differently. AIM: To identify ways of supporting GPs confronted with a PWD's euthanasia request. DESIGN AND SETTING: Two expert nominal group meetings were organised with Dutch care physicians for older people, GPs, legal experts, a healthcare chaplain, a palliative care consultant, and a psychologist. METHOD: A total of 15 experts participated in the meetings. Both meetings were audio-recorded, transcribed verbatim, and analysed using thematic analysis. RESULTS: Four themes emerged from the meetings: support provided by healthcare professionals, influencing public opinion, educational activities, and managing time and work pressure. The need for support was considered highest for GPs for all of these themes. CONCLUSION: Consensus was reached with the help of experts on support needs for GPs confronted with euthanasia requests from PWD. A concise and clear explanation of the law is strongly desired. Changing public opinion seems the most challenging and a long-term aim. Communication training for finding the right balance between the physician's professional responsibility and the patient's autonomy should be made available, as a short-term aim.

Defining human mean circulatory filling pressure in the intensive care unit.

Potentially, mean circulatory filling pressure (Pmcf) could aid hemodynamic management in patients admitted to the intensive care unit (ICU). However, data regarding the normal range for Pmcf do not exist challenging its clinical use. We aimed to define the range for Pmcf for ICU patients and also calculated in what percentage of cases equilibrium between arterial blood pressure (ABP) and central venous pressure (CVP) was reached. In patients in whom no equilibrium was reached, we corrected for arterial-to-venous compliance differences. Finally, we studied the influence of patient characteristics on Pmcf. We hypothesized fluid balance, the use of vasoactive medication, being on mechanical ventilation, and the level of positive end-expiratory pressure would be positively associated with Pmcf. We retrospectively studied a cohort of 311 patients that had cardiac arrest in ICU while having active recording of ABP and CVP 1 min after death. Median Pmcf was 15 mmHg [interquartile range (IQR) 12-18]. ABP and CVP reached an equilibrium state in 52% of the cases. Correction for arterial-to-venous compliances differences resulted in a maximum alteration of 1.3 mmHg in Pmcf. Fluid balance over the last 24 h, the use of vasoactive medication, and being on mechanical ventilation were associated with a higher Pmcf. Median Pmcf was 15 mmHg (IQR 12-18). When ABP remained higher than CVP, correction for arterial-to-venous compliance differences did not result in a clinically relevant alteration of Pmcf. Pmcf was affected by factors known to alter vasomotor tone and effective circulating blood volume.NEW & NOTEWORTHY In a cohort of 311 intensive care unit (ICU) patients, median mean circulatory filling pressure (Pmcf) measured after cardiac arrest was 15 mmHg (interquartile range 12-18). In 48% of cases, arterial blood pressure remained higher than central venous pressure, but correction for arterial-to-venous compliance differences did not result in clinically relevant alterations of Pmcf. Fluid balance, use of vasopressors or inotropes, and being on mechanical ventilation were associated with a higher Pmcf.

Euthanasia requests in dementia cases; what are experiences and needs of Dutch physicians? A qualitative interview study.

BACKGROUND: In the Netherlands, in 2002, euthanasia became a legitimate medical act, only allowed when the due care criteria and procedural requirements are met. Legally, an Advanced Euthanasia Directive (AED) can replace direct communication if a patient can no longer express his own wishes. In the past decade, an exponential number of persons with dementia (PWDs) share a euthanasia request with their physician. The impact this on physicians, and the consequent support needs, remained unknown. Our objective was to gain more insight into the experiences and needs of Dutch general practitioners and elderly care physicians when handling a euthanasia request from a person with dementia (PWD). METHODS: We performed a qualitative interview study. Participants were recruited via purposive sampling. The interviews were transcribed verbatim, and analyzed using the conventional thematic content analysis. RESULTS: Eleven general practitioners (GPs) and elderly care physicians with a variety of experience and different attitudes towards euthanasia for PWD were included. Euthanasia requests appeared to have a major impact on physicians. Difficulties they experienced were related to timing, workload, pressure from and expectations of relatives, society's negative view of dementia in combination with the 'right to die' view, the interpretation of the law and AEDs, ethical considerations, and communication with PWD and relatives. To deal with these difficulties, participants need support from colleagues and other professionals. Although elderly care physicians appreciated moral deliberation and support by chaplains, this was hardly mentioned by GPs. CONCLUSIONS: Euthanasia requests in dementia seem to place an ethically and emotionally heavy burden on Dutch GPs and elderly care physicians. The awareness of, and access to, existing and new support mechanisms needs further exploration.

Operative management versus non-operative management of rib fractures in flail chest injuries: a systematic review.

PURPOSE: Flail chest is a life-threatening complication of severe chest trauma with a mortality rate of up to 15 %. The standard non-operative management has high comorbidities with pneumonia and often leads to extended Intensive Care Unit (ICU) stay, due to insufficient respiratory function and complications. The aim of this literature study was to investigate how operative management improves patient care for adults with flail chest. METHODS: Randomized-controlled trials comparing operative management versus non-operative management of flail chest were included in this systematic review and meta-analysis. PubMed, Trip Database, and Google Scholar were used for study identification. We compared operative-to-non-operative management in adult flail chest patients. Mean difference and risk ratio for mortality, pneumonia rate, duration of mechanical ventilation, duration of ICU stay, duration of hospital stay, tracheostomy rate, and treatment costs were calculated by pooling these publication results. RESULTS: Three randomized-controlled trials were included in this systematic review. In total, there were 61 patients receiving operative management compared to 62 patients in the non-operative management group. A positive effect of surgical rib fracture fixation was observed for pneumonia rate [ES 0.5, 95 % CI (0.3, 0.7)], duration of mechanical ventilation (DMV) [ES -6.5 days 95 % CI (-11.9, -1.2)], duration of ICU stay [ES -5.2 days 95 % CI (-6.2, -4.2)], duration of hospital stay (DHS) [ES -11.4 days 95 % CI (-12.4, -10.4)], tracheostomy rate (TRCH) [ES 0.4, 95 % CI (0.2, 0.7)], and treatment costs (saving $9.968,00-14.443,00 per patient). No significant difference was noted in mortality rate [ES 0.6, 95 % CI (0.1, 2.4)] between the two treatment strategies. CONCLUSIONS: Despite the relatively small number of patients included, different methodologies and differences in presentation of outcomes, operative management of flail chest seems to be a promising treatment strategy that improves patients' outcomes in various ways. However, the effect on mortality rate remains inconclusive. Therefore, research should continue to explore operative management as a viable method for flail chest injuries.