Lowering PCO2 With Noninvasive Ventilation Is Associated With Improved Survival in Chronic Hypercapnic Respiratory Failure.

BACKGROUND: Chronic hypercapnic respiratory failure is associated with high mortality. Although previous work has demonstrated a mortality improvement with high-intensity noninvasive ventilation in COPD, it is unclear whether a PCO2 reduction strategy is associated with improved outcomes in other populations of chronic hypercapnia. METHODS: The objective of this study was to investigate the association between PCO2 reduction (by using transcutaneous PCO2 as an estimate for PaCO2 and survival in a broad population of individuals treated with noninvasive ventilation for chronic hypercapnia. We hypothesized that reductions in PCO2 would be associated with improved survival. Therefore, we performed a cohort study of all the subjects evaluated from February 2012 to January 2021 for noninvasive ventilation initiation and/or optimization due to chronic hypercapnia at a home ventilation clinic in an academic center. We used multivariable Cox proportional hazard models with time-varying coefficients and PCO2 as a time-varying covariate to test the association between PCO2 and all-cause mortality and when adjusting for known cofounders. RESULTS: The mean ± SD age of 337 subjects was 57 ± 16 years, 37% women, and 85% white. In a univariate analysis, survival probability increased with reductions in PCO2 to < 50 mm Hg after 90 d, and these remained significant after adjusting for age, sex, race, body mass index, diagnosis, Charlson comorbidity index, and baseline PCO2 . In the multivariable analysis, the subjects who had a PaCO2 < 50 mm Hg had a reduced mortality risk of 94% between 90 and 179 d (hazard ratio [HR] 0.06, 95% CI 0.01-0.50), 69% between 180 and 364 d (HR 0.31, 95% CI 0.12-0.79), and 73% for 365-730 d (HR 0.27, 95% CI 0.13-0.56). CONCLUSIONS: Reduction in PCO2 from baseline for subjects with chronic hypercapnia treated with noninvasive ventilation was associated with improved survival. Management strategies should target the greatest attainable reductions in PCO2 .

Electric impedance tomography-guided PEEP titration reduces mechanical power in ARDS: a randomized crossover pilot trial.

BACKGROUND: In patients with acute respiratory distress syndrome undergoing mechanical ventilation, positive end-expiratory pressure (PEEP) can lead to recruitment or overdistension. Current strategies utilized for PEEP titration do not permit the distinction. Electric impedance tomography (EIT) detects and quantifies the presence of both collapse and overdistension. We investigated whether using EIT-guided PEEP titration leads to decreased mechanical power compared to high-PEEP/FiO2 tables. METHODS: A single-center, randomized crossover pilot trial comparing EIT-guided PEEP selection versus PEEP selection using the High-PEEP/FiO2 table in patients with moderate-severe acute respiratory distress syndrome. The primary outcome was the change in mechanical power after each PEEP selection strategy. Secondary outcomes included changes in the 4 × driving pressure + respiratory rate (4 ΔP, + RR index) index, driving pressure, plateau pressure, PaO2/FiO2 ratio, and static compliance. RESULTS: EIT was consistently associated with a decrease in mechanical power compared to PEEP/FiO2 tables (mean difference - 4.36 J/min, 95% CI - 6.7, - 1.95, p = 0.002) and led to lower values in the 4ΔP + RR index (- 11.42 J/min, 95% CI - 19.01, - 3.82, p = 0.007) mainly driven by a decrease in the elastic-dynamic power (- 1.61 J/min, - 2.99, - 0.22, p = 0.027). The elastic-static and resistive powers were unchanged. Similarly, EIT led to a statistically significant change in set PEEP (- 2 cmH2O, p = 0.046), driving pressure, (- 2.92 cmH2O, p = 0.003), peak pressure (- 6.25 cmH2O, p = 0.003), plateau pressure (- 4.53 cmH2O, p = 0.006), and static respiratory system compliance (+ 7.93 ml/cmH2O, p = 0.008). CONCLUSIONS: In patients with moderate-severe acute respiratory distress syndrome, EIT-guided PEEP titration reduces mechanical power mainly through a reduction in elastic-dynamic power. Trial registration This trial was prospectively registered on Clinicaltrials.gov (NCT03793842) on January 4th, 2019.

Electrical Impedance Tomography in Acute Respiratory Distress Syndrome Management.

OBJECTIVE: To describe, through a narrative review, the physiologic principles underlying electrical impedance tomography, and its potential applications in managing acute respiratory distress syndrome (ARDS). To address the current evidence supporting its use in different clinical scenarios along the ARDS management continuum. DATA SOURCES: We performed an online search in Pubmed to review articles. We searched MEDLINE, Cochrane Central Register, and clinicaltrials.gov for controlled trials databases. STUDY SELECTION: Selected publications included case series, pilot-physiologic studies, observational cohorts, and randomized controlled trials. To describe the rationale underlying physiologic principles, we included experimental studies. DATA EXTRACTION: Data from relevant publications were reviewed, analyzed, and its content summarized. DATA SYNTHESIS: Electrical impedance tomography is an imaging technique that has aided in understanding the mechanisms underlying multiple interventions used in ARDS management. It has the potential to monitor and predict the response to prone positioning, aid in the dosage of flow rate in high-flow nasal cannula, and guide the titration of positive-end expiratory pressure during invasive mechanical ventilation. The latter has been demonstrated to improve physiologic and mechanical parameters correlating with lung recruitment. Similarly, its use in detecting pneumothorax and harmful patient-ventilator interactions such as pendelluft has been proven effective. Nonetheless, its impact on clinically meaningful outcomes remains to be determined. CONCLUSIONS: Electrical impedance tomography is a potential tool for the individualized management of ARDS throughout its different stages. Clinical trials should aim to determine whether a specific approach can improve clinical outcomes in ARDS management.

Transcutaneous CO2 monitoring as indication for inpatient non-invasive ventilation initiation in patients with amyotrophic lateral sclerosis.

INTRODUCTION/AIMS: Amyotrophic lateral sclerosis (ALS) is characterized by profound muscle weakness, including diaphragmatic weakness resulting in hypercapnic respiratory failure. While non-invasive ventilation (NIV) is usually initiated in the home, patients presenting with hypercapnic respiratory failure may be at high risk of adverse outcomes with delays in treatment. We aim to describe the clinical utility of transcutaneous CO2 (TCO2 ) to assess the need for inpatient initiation of NIV. METHODS: Eight patients from the University of Michigan Pranger ALS clinic were directly admitted to the hospital for urgent initiation of NIV between May 2020-May 2021. A retrospective review of electronic medical records, including pre-hospital pulmonary function assessments, hospitalization blood gases, and NIV use metrics was performed. RESULTS: All eight patients had symptoms of respiratory insufficiency at time of admission, although not all patients had forced vital capacity (FVC) measurements that would identify need for NIV. All patients had measured TCO2 > 45 mmHg. Seven of eight patients had worsening hypercapnia after admission, indicating advanced respiratory failure. All patients were titrated to tolerance of continuous nocturnal NIV while in the hospital, with an average length of stay of 6.5 days (range, 3-8). All patients demonstrated compliance with NIV, >4 h, at post-hospital follow-up. DISCUSSION: Many current ambulatory measurements underestimate, or incompletely evaluate, respiratory dysfunction, and arterial blood gases are not typically readily available. Outpatient TCO2 measurements can serve as a useful screening tool to identify ALS patients who would benefit from inpatient initiation and titration of NIV.

Noninvasive ventilation: An important option in the management of hemidiaphragm paralysis.

Hemidiaphragm paralysis (HP) is a potential complication of cardiac surgery. While most patients are either asymptomatic or have mild symptoms, some are at risk of developing life-threatening hypercapnia. We present a case of a patient who developed HP after tricuspid valve replacement. Diaphragm plication was deferred due to underlying comorbidities, but over time she developed severe hypercapnic respiratory failure requiring intensive care unit admission. Chronic noninvasive ventilation therapy (NIV) was initiated, which improved her symptoms and hypercapnia and prevented further hospitalizations. For patients with iatrogenic HP unable to undergo diaphragm plication, Pulmonology referral for initiation of NIV should be strongly considered.

Mortality and Healthcare Use of Patients with Compensated Hypercapnia.

Rationale: Acute hypercapnic respiratory failure has been shown to be associated with worse outcomes for various disease states, but less is known about patients with compensated hypercapnic respiratory failure. Although these patients have a normal pH, it remains unknown whether chronically elevated carbon dioxide partial pressure (Pco2), irrespective of etiology, puts patients at risk of adverse events. Objectives: To understand the burden of and clinical factors associated with morbidity and mortality in patients with compensated hypercapnic respiratory failure. Methods: We performed a query of the electronic medical record to identify patients hospitalized at the University of Michigan from January 1 to December 31, 2018, who had compensated hypercapnia, by using a Pco2 ⩾ 50 mm Hg and a pH of 7.35-7.45 on arterial blood gas . We obtained demographic and clinical data from the electronic medical record. Survival probabilities for Pco2 subgroups (50.0-54.9, 55.0-64.9, and ⩾65.0 mm Hg) were determined by using the Kaplan-Meier product limit estimator. Cox proportional hazard models were constructed to test the association between Pco2 and all-cause mortality. Results: We identified 491 patients with compensated hypercapnia. The mean age was 60.5 ± 16.2 years. Patients were 57.4% male and 86.2% white. The mean pH and Pco2 were 7.38 ± 0.03 and 58.8 ± 9.7 mm Hg, respectively. There was a total of 1,030 hospitalizations, with 44.4% of patients having two or more admissions. The median numbers of cumulative hospital and intensive care unit days were 21.0 (interquartile range [IQR], 11.0-38.0) and 7.0 (IQR, 3.0-14.0) days, respectively. Two hundred seventeen patients (44.2%) died over a median of 592 days. In univariate analysis, every 5-mm Hg increase in Pco2 was associated with a higher risk of all-cause death (hazard ratio, 1.09; 95% confidence interval [CI]: 1.03-1.16; P = 0.004). This association was maintained after adjusting for the age, sex, body mass index (BMI), and Charlson comorbidity index (hazard ratio of 1.09 for every 5-mm Hg increase in Pco2; 95% CI: 1.02-1.16; P = 0.009). There was a statistically significant interaction between the Pco2 and the BMI in relation to mortality (P = 0.01 for the interaction term). Conclusions: Patients with compensated hypercapnic respiratory failure have high mortality and healthcare use, with higher Pco2 being associated with worse survival. Hypercapnic patients with obesity have a higher risk of death with increases in Pco2.

Continuing Non-Invasive Ventilation During Amyotrophic Lateral Sclerosis-Related Hospice Care Is Medically, Administratively, and Financially Feasible.

BACKGROUND: Amyotrophic Lateral Sclerosis (ALS) is a terminal neuromuscular disease with patients dying within 3-5 years of diagnosis. Most patients choose to forego invasive life sustaining measures. Timing of hospice referral can be challenging given the advancement of non-invasive ventilation (NIV) technology. OBJECTIVE: To describe the characteristics of patients enrolled in hospice from an ALS clinic at 1 academic medical center and to perform a cost analysis for patients who remained on ventilator support. METHODS: Retrospective cross-sectional study of patients enrolled in hospice over a 2-year period. Clinical characteristics included ALS Functional Rating Scale Revised (ALSFRS-R) score, Forced Vital Capacity (FVC), use of NIV and mechanical insufflation-exsufflation (MIE), riluzole use, and length of stay in hospice. A cost analysis was performed for patients enrolled in Duke Home Care and Hospice. RESULTS: 85 of 104 patients who died were enrolled in hospice. Median days enrolled in hospice was 84. Patients who continued on NIV had similar hospice length of stay as those on no respiratory support (88 versus 80 days, p = 0.83). Bulbar patients had a trend toward shorter length of stay in hospice than limb onset patients (71 versus 101 days, p = 0.49). Cost analysis showed that hospice maintained a mean net operating revenue of $3234.50 per patient who continued on NIV. CONCLUSIONS: Hospice referrals for ALS patients on NIV can be challenging. This study shows that even with continued NIV use, most ALS patients die within the expected 6 months on home hospice, and care remains cost effective for hospice agencies.

Barriers to Addressing the Spiritual and Religious Needs of Patients and Families in the Intensive Care Unit: A Qualitative Study of Critical Care Physicians.

OBJECTIVES: Though critical care physicians feel responsible to address spiritual and religious needs with patients and families, and feel comfortable in doing so, they rarely address these needs in practice. We seek to explore this discrepancy through a qualitative interview process among physicians in the intensive care unit (ICU). METHODS: A qualitative research design was constructed using semi-structured interviews among 11 volunteer critical care physicians at a single institution in the Midwest. The physicians discussed barriers to addressing spiritual and religious needs in the ICU. A code book of themes was created and developed through a regular and iterative process involving 4 investigators. Data saturation was reached as no new themes emerged. RESULTS: Physicians reported feeling uncomfortable in addressing the spiritual needs of patients with different religious views. Physicians reported time limitations, and prioritized biomedical needs over spiritual needs. Many physicians delegate these conversations to more experienced spiritual care providers. Physicians cited uncertainty into how to access spiritual care services when they were desired. Additionally, physicians reported a lack of reminders to meet these needs, mentioning frequently the ICU bundle as one example. CONCLUSIONS: Barriers were identified among critical care physicians as to why spiritual and religious needs are rarely addressed. This may help inform institutions on how to better meet these needs in practice.

Addressing religion and spirituality in the intensive care unit: A survey of clinicians.

OBJECTIVE: Studies have shown that when religious and spiritual concerns are addressed by the medical team, patients are more satisfied with their care and have lower healthcare costs. However, little is known about how intensive care unit (ICU) clinicians address these concerns. The objective of this study was to determine how ICU clinicians address the religious and spiritual needs of patients and families. METHOD: We performed a cross-sectional survey study of ICU physicians, nurses, and advance practice providers (APPs) to understand their attitudes and beliefs about addressing the religious and spiritual needs of ICU patients and families. Each question was designed on a 4- to 5-point Likert scale. A total of 219 surveys were collected over a 4-month period. RESULT: A majority of clinicians agreed that it is their responsibility to address the religious/spiritual needs of patients. A total of 79% of attendings, 74% of fellows, 89% of nurses, and 83% of APPs agreed with this statement. ICU clinicians also feel comfortable talking to patients about their religious/spiritual concerns. In practice, few clinicians frequently address religious/spiritual concerns. Only 14% of attendings, 3% of fellows, 26% of nurses, and 17% of APPs say they frequently ask patients about their religious/spiritual needs. SIGNIFICANCE OF RESULTS: This study shows that ICU clinicians see it as their role to address the religious and spiritual needs of their patients, and report feeling comfortable talking about these issues. Despite this, a minority of clinicians regularly address religious and spiritual needs in clinical practice. This highlights a potential deficit in comprehensive critical care as outlined by many national guidelines.

Respiratory Failure in Amyotrophic Lateral Sclerosis.

Amyotrophic lateral sclerosis is a progressive neuromuscular disease characterized by both lower motor neuron and upper motor neuron dysfunction. Although clinical presentations can vary, there is no cure for ALS, and the disease is universally terminal, with most patients dying of respiratory complications. Patients die, on average, within 3 to 5 years of diagnosis, unless they choose to undergo tracheostomy, in which case, they may live, on average, 2 additional years. Up to 95% of patients with ALS in the United States choose not to undergo tracheostomy; management of respiratory failure is therefore aimed at both prolonging survival as well as improving quality of life. Standard of care for patients with ALS includes treatment from multidisciplinary teams, but many patients do not have consistent access to a pulmonary physician who regularly sees patients with this disease. The goal of this review was to serve as an overview of respiratory considerations in the management of ALS. This article discusses noninvasive ventilation in the management of respiratory muscle weakness, mechanical insufflation/exsufflation devices for airway clearance, and treatment of aspiration, including timing of placement of a percutaneous endoscopic gastrostomy tube, as well as secretion management. In addition, it is important for physicians to consider end-of-life issues such as advanced directives, hospice referral, and ventilator withdrawal.

Intensive Care Clinicians' Views on the Role of Chaplains.

There is evidence that addressing the religious and spiritual needs of patients has positive effects on patient satisfaction and health care utilization. However, in the intensive care unit (ICU), chaplains are often consulted only at the very end of life, thereby leaving patients' spiritual needs unmet. This study looked at the views of 219 ICU clinicians on the role of chaplains. We found that all clinicians find chaplains helpful when a patient is dying or when the chaplain brings up religious or spiritual topics. Physicians find chaplains less helpful in other clinical scenarios such as challenging family meetings or when patients are recovering. Nurses are more likely to consult chaplains for a difficult family meeting or when patients are recovering from critical illness. Communication between clinicians and chaplains, both directly and indirectly through electronic health record notes, remains infrequent, highlighting the need for interventions aimed at improving multidisciplinary spiritual care.

Documenting presence: A descriptive study of chaplain notes in the intensive care unit.

OBJECTIVE: To clarify and record their role in the care of patients, hospital chaplains are increasingly called on to document their work in the medical record. Chaplains' documentation, however, varies widely, even within single institutions. Little has been known, however, about the forms that documentation takes in different settings or about how clinicians interpret chaplain documentation. This study aims to examine how chaplains record their encounters in an intensive care unit (ICU). METHOD: We performed a retrospective chart review of the chaplain notes filed on patients in the adult ICUs at a major academic medical center over a six-month period. We used an iterative process of qualitative textual analysis to code and analyze chaplains' free-text entries for emergent themes. RESULTS: Four primary themes emerged from chaplain documentation. First, chaplains frequently used "code language," such as "compassionate presence," to recapitulate interventions already documented elsewhere in a checklist of ministry interventions. Second, chaplains typically described what they observed rather than interpreting its clinical significance. Third, chaplains indicated passive follow-up plans, waiting for patients or family members to request further interaction. Fourth, chaplains sometimes provided insights into particular relationship dynamics. SIGNIFICANCE OF RESULTS: As members of the patient care team, chaplains access the medical record to communicate clinically relevant information. The present study suggests that recent emphasis on evidence-based practice may be leading chaplains, at least in the medical center we studied, to use a reduced, mechanical language insufficient for illuminating patients' individual stories. We hope that our study will promote further consideration of how chaplain documentation can enhance patient care and convey the unique value that chaplains add to the clinical team.

"The Patient Is Dying, Please Call the Chaplain": The Activities of Chaplains in One Medical Center's Intensive Care Units.

CONTEXT: Patients and families commonly experience spiritual stress during an intensive care unit (ICU) admission. Although most patients report that they want spiritual support, little is known about how these issues are addressed by hospital chaplains. OBJECTIVES: To describe the prevalence, timing, and nature of hospital chaplain encounters in ICUs. METHODS: This was a retrospective cross-sectional study of adult ICUs at an academic medical center. Measures included days from ICU admission to initial chaplain visit, days from chaplain visit to ICU death or discharge, hospital and ICU lengths of stay, severity of illness at ICU admission and chaplain visit, and chart documentation of chaplain communication with the ICU team. RESULTS: Of a total of 4169 ICU admissions over six months, 248 (5.9%) patients were seen by chaplains. Of the 246 patients who died in an ICU, 197 (80%) were seen by a chaplain. There was a median of two days from ICU admission to chaplain encounter and a median of one day from chaplain encounter to ICU discharge or death. Chaplains communicated with nurses after 141 encounters (56.9%) but with physicians after only 14 encounters (5.6%); there was no documented communication in 55 encounters (22%). CONCLUSION: In the ICUs at this tertiary medical center, chaplain visits are uncommon and generally occur just before death among ICU patients. Communication between chaplains and physicians is rare. Chaplaincy service is primarily reserved for dying patients and their family members rather than providing proactive spiritual support. These observations highlight the need to better understand challenges and barriers to optimal chaplain involvement in ICU patient care.

The Use of Indwelling Tunneled Pleural Catheters for Recurrent Pleural Effusions in Patients With Hematologic Malignancies: A Multicenter Study.

BACKGROUND: Malignant pleural effusion is a common complication of advanced malignancies. Indwelling tunneled pleural catheter (IPC) placement provides effective palliation but can be associated with complications, including infection. In particular, hematologic malignancy and the associated immunosuppressive treatment regimens may increase infectious complications. This study aimed to review outcomes in patients with hematologic malignancy undergoing IPC placement. METHODS: A retrospective multicenter study of IPCs placed in patients with hematologic malignancy from January 2009 to December 2013 was performed. Inclusion criteria were recurrent, symptomatic pleural effusion and an underlying diagnosis of hematologic malignancy. Records were reviewed for patient demographics, operative reports, and pathology, cytology, and microbiology reports. RESULTS: Ninety-one patients (mean ± SD age, 65.4 ± 15.4 years) were identified from eight institutions. The mean × SD in situ dwell time of all catheters was 89.9 ± 127.1 days (total, 8,160 catheter-days). Seven infectious complications were identified, all of the pleural space. All patients were admitted to the hospital for treatment, with four requiring additional pleural procedures. Two patients died of septic shock related to pleural infection. CONCLUSIONS: We present, to our knowledge, the largest study examining clinical outcomes related to IPC placement in patients with hematologic malignancy. An overall 7.7% infection risk and 2.2% mortality were identified, similar to previously reported studies, despite the significant immunosuppression and pancytopenia often present in this population. IPC placement appears to remain a reasonable clinical option for patients with recurrent pleural effusions related to hematologic malignancy.