The number and function of T regulatory cells in obese atopic female asthmatics.

BACKGROUND: Mechanisms underlying the association between asthma and obesity remain poorly understood. Obesity appears to be a risk factor for asthma, and obese asthmatics fare poorly compared to lean asthmatics. OBJECTIVES: To explore the possibility that reduced regulatory T cell (Treg) number and function contribute to the obesity-asthma association. We concentrated on obese females with childhood-onset asthma, since Treg may be involved in this phenotype. METHODS: We recruited 64 women (ages 18-50) into four groups: lean (BMI 18-25 kg/m2) controls (n = 17) and asthmatics (n = 13), and obese (BMI ≥ 35 kg/m2) controls (n = 17) and asthmatics (n = 17). Asthmatics had atopy and childhood-diagnosed asthma. We assessed lung function, asthma control and quality of life. Peripheral blood CD4+/CD25+/FoxP3+ Treg cells were identified and counted by flow cytometry and expressed as % total CD4+ T cells. We assessed Treg cell function by the ability of CD4+/CD25+ Treg cells to suppress autologous CD4+/CD25- responder T cell (Tresp) proliferation and measured as % suppression of Tresp cell proliferation. RESULTS: Obese asthmatics had worse lung function, asthma control, and quality of life compared to lean asthmatics. Compared to lean or obese control groups, the number of Treg cells in the obese asthmatics was approximately 1.58- or 1.73-fold higher. The ability of Treg cells from obese-asthmatics to suppress Tresp cell proliferation was reduced. CONCLUSIONS: Obese, atopic women with childhood diagnosed asthma demonstrate increased Treg cell number and mildly decreased Treg cell function. Our data do not support the view that reduced Treg cell number contributes to this obese-asthma phenotype.

Efficacy of nasal mometasone for the treatment of chronic sinonasal disease in patients with inadequately controlled asthma.

BACKGROUND: Chronic sinonasal disease is common in asthmatic patients and associated with poor asthma control; however, there are no long-term trials addressing whether chronic treatment of sinonasal disease improves asthma control. OBJECTIVE: We sought to determine whether treatment of chronic sinonasal disease with nasal corticosteroids improves asthma control, as measured by the Childhood Asthma Control Test and Asthma Control Test in children and adults, respectively. METHODS: A 24-week multicenter, randomized, placebo-controlled, double-blind trial of placebo versus nasal mometasone in adults and children with inadequately controlled asthma was performed. Treatments were randomly assigned, with concealment of allocation. RESULTS: Two hundred thirty-seven adults and 151 children were randomized to nasal mometasone versus placebo, and 319 participants completed the study. There was no difference in the Childhood Asthma Control Test score (difference in change with mometasone - change with placebo [ΔM - ΔP], -0.38; 95% CI, -2.19 to 1.44; P = .68; age 6-11 years) or the Asthma Control Test score (ΔM - ΔP, 0.51; 95% CI, -0.46 to 1.48; P = .30; age ≥12 years) in those assigned to mometasone versus placebo. In children and adolescents (age 6-17 years) there was no difference in asthma or sinus symptoms but a decrease in episodes of poorly controlled asthma defined by a decrease in peak flow. In adults there was a small difference in asthma symptoms measured by using the Asthma Symptom Utility Index (ΔM - ΔP, 0.06; 95% CI, 0.01 to 0.11; P < .01) and in nasal symptoms (sinus symptom score ΔM - ΔP, -3.82; 95% CI, -7.19 to -0.45; P = .03) but no difference in asthma quality of life, lung function, or episodes of poorly controlled asthma in adults assigned to mometasone versus placebo. CONCLUSIONS: Treatment of chronic sinonasal disease with nasal corticosteroids for 24 weeks does not improve asthma control. Treatment of sinonasal disease in asthmatic patients should be determined by the need to treat sinonasal disease rather than to improve asthma control.

Association of nesfatin-1 and fat mass in cystic fibrosis.

BACKGROUND: The mechanisms of fat mass (FM) loss in cystic fibrosis (CF) are poorly understood but could represent complex pathways involving dysregulation of appetite-modulating peptides and an amplified inflammatory response. Nesfatin-1 is a newly described peptide that decreases food intake and FM but has not been studied in CF. OBJECTIVES: We hypothesized that changes in the appetite-suppressing hormone nesfatin-1 would be physiological, and levels would be lower in advanced CF patients with lower FM compared to those with milder disease and healthy controls. We determined the levels of the cytokines TNF-α, IL-1ß, and IL-6 as they have been associated with weight loss in disease states. METHODS: Fifty-four adult CF subjects, i.e. 17 with severe, 22 with moderate, and 15 with mild disease, as well as 18 controls were recruited. PFT and body composition analysis (via bioelectrical impedance) were performed. Nesfatin-1 and cytokine levels were determined by ELISA. RESULTS: Contrary to our proposed hypothesis, nesfatin-1 levels were highest in CF patients with severe disease and the lowest FM. A significant negative correlation between nesfatin-1 levels and FM was found only in the severe CF group (r = -0.7, p = 0.003). In forward stepwise regression analysis, only FM was significantly associated with nesfatin-1 levels. Levels of TNF-α and IL-6 were elevated in the severe CF group, but there was no association with either FM or nesfatin-1. CONCLUSION: In advanced CF and low FM, nesfatin-1 plasma levels are significantly increased and inversely correlated with the FM. Our results further suggest that nesfatin-1 exerts its effects independently of TNF-α or IL-6.

Finding an alternative diagnosis does not justify increased use of CT-pulmonary angiography.

BACKGROUND: The increased use of computed tomography pulmonary angiography (CTPA) is often justified by finding alternative diagnoses explaining patients' symptoms. However, this has not been rigorously examined. METHODS: We retrospectively reviewed CTPA done at our center over an eleven year period (2000 - 2010) in patients with suspected pulmonary embolus (PE). We then reviewed in detail the medical records of a representative sample of patients in three index years - 2000, 2005 and 2008. We determined whether CTPA revealed pulmonary pathology other than PE that was not readily identifiable from the patient's history, physical examination and prior chest X-ray. We also assessed whether the use of pre-test probability guided diagnostic strategy for PE. RESULTS: A total of 12,640 CTPA were performed at our center from year 2000 to 2010. The number of CTPA performed increased from 84 in 2000 to 2287 in 2010, a 27 fold increase. Only 7.6 percent of all CTPA and 3.2 percent of avoidable CTPAs (low or intermediate pre-test probability and negative D-dimer) revealed previously unknown findings of any clinical significance. When we compared 2008 to 2000 and 2005, more CTPAs were performed in younger patients (mean age (years) for 2000: 67, 2005: 63, and 2008: 60, (p=0.004, one-way ANOVA)). Patients were less acutely ill with fewer risk factors for PE. Assessment of pre-test probability of PE and D-dimer measurement were rarely used to select appropriate patients for CTPA (pre-test probability of PE documented in chart (% total) in year 2000: 4.1%, 2005: 1.6%, 2008: 3.1%). CONCLUSIONS: Our data do not support the argument that increased CTPA use is justified by finding an alternative pulmonary pathology that could explain patients' symptoms. CTPA is being increasingly used as the first and only test for suspected PE.

A return to 1992: Using the "blowhole" technique for diffuse subcutaneous emphysema caused by a broncho-pleural fistula.

A bronchopleural fistula (BPF) is an abnormal communication between the bronchial tree and pleural space resulting in a high risk for morbidity and mortality. We describe a case highlighting the management of a BPF with subcutaneous and mediastinal air resulting in dysphagia and dysphonia using a technique that was first described in a 1992 CHEST article. The "Blowhole" technique may be utilized for patients that are poor surgical candidates requiring rapid correction and prevention of detrimental consequences such as pneumomediastinum, tension pneumothorax, upper airway compromise and pneumopericardium.

Nocturnal asthma.

PURPOSE OF REVIEW: The aim is to review pathophysiological mechanisms and treatment of nocturnal asthma. RECENT FINDINGS: Physiologic changes accompanying sleep, as well as the nocturnal phase of circadian rhythms, may have an adverse effect on asthma control. Chronotherapeutic principles, which consider circadian variation in relevant biologic rhythms, may improve asthma outcomes. Administration of long-acting bronchodilators and inhaled corticosteroids which achieve maximum efficacy at night may improve nocturnal asthma. Comorbid conditions that may contribute to nocturnal asthma should be considered. The prevalence of obstructive sleep apnea is greater in a cohort of patients with severe asthma than in moderate asthma and in BMI and age matched nonasthmatic controls, suggesting a link between these diseases. A large trial concluded that esomeprazole did not improve asthma control even with comorbid acid reflux, questioning the importance of acid reflux in asthma. The role of polymorphisms of the ß2-adrenergic receptor and their relationship with nocturnal asthma remain controversial. SUMMARY: Sleep is a time of vulnerability to respiratory compromise, especially in asthma patients experiencing nocturnal exacerbations. This asthma phenotype is associated with poorer control, reduced sleep quality, daytime somnolence and increased morbidity and mortality. Nocturnal asthma is a common but under-recognized problem.

Relationship of adipokines with immune response and lung function in obese asthmatic and non-asthmatic women.

BACKGROUND: Obesity is a risk factor for asthma. Studies in mice suggest that the adipokines leptin and adiponectin affect asthmatic responses. The purpose of this study was to determine if adipokines associated with obesity are (1) altered in obese women with asthma compared to controls and (2) associated with increased cytokines and chemokines involved in allergic inflammation. METHODS: We performed a cross-sectional study of asthmatic and non-asthmatic obese premenopausal women. Participants answered questionnaires and performed lung function tests. Serum and peripheral blood mononuclear cells (PBMCs) were collected for analysis of cytokines and adipokines. RESULTS: A total of 22 asthmatic (mean body mass index 40.0 ± 5.1 kg/m(2)) and 20 non-asthmatic women (mean body mass index 41.3 ± 5.6 kg/m(2)) participated. We found no difference in serum adipokine concentrations between asthmatics and non-asthmatics. Serum adiponectin correlated positively with PBMC eotaxin (r(s) = 0.55, p = .0003) and RANTES (regulated upon activation, normal T-cell expressed, and secreted) (r(s) = 0.36, p = .03), whereas serum leptin correlated negatively with PBMC eotaxin (r(s) = -0.34, p = .04). There was a negative correlation between serum adiponectin and PBMC interferon-γ (r(s) = -0.41, p = .01). CONCLUSIONS: Perturbations of adipokines that occur in obesity were correlated with decreased cytokine production typically associated with allergic responses in PBMC of obese premenopausal women. This study suggests that although obese asthmatics may have elements of Th2-mediated inflammation, adipokine derangements in obesity are associated with Th1 rather than Th2 bias. Obesity has complex effects on allergic inflammation and is likely to be important modifier of the pathogenesis of airway disease in asthma.

Effects of obstructive sleep apnea and gastroesophageal reflux disease on asthma control in obesity.

BACKGROUND: Obesity is a risk factor for asthma. Obese asthmatics often have poor asthma control and respond poorly to therapy. It has been suggested that co-morbidities associated with obesity, such as reflux and obstructive sleep apnea, could be important factors contributing to poor asthma control in obese patients. OBJECTIVES: The purpose of this study was to determine if (1) reflux and/or (2) symptoms of sleep apnea contribute to poor asthma control in obesity. METHODS: We studied asthmatic subjects participating in a trial of reflux treatment. Participants underwent baseline evaluation of asthma symptoms and lung function. Overall 304 participants underwent esophageal pH probe testing; 246 participants were evaluated for obstructive sleep apnea symptoms. RESULTS: Of 402 participants in this trial, 51% were obese. Role of reflux in asthma control. Those with higher body mass index (BMI) reported a higher prevalence of reflux symptoms, but the prevalence of pH probe acid reflux was similar in all groups. Reflux was not associated with measures of asthma control in obese patients. Role of obstructive sleep apnea in asthma control. Symptoms and self-report of obstructive sleep apnea were more common with increasing BMI and associated with worse asthma control as measured by the Juniper Asthma Control questionnaire and Asthma Symptom Utility Index. CONCLUSIONS: Our data suggest that obstructive sleep apnea, but not gastroesophageal reflux disease, may contribute significantly to poor asthma control in obese patients.

Ghrelin receptor expression in lymphocytes isolated from adult cystic fibrosis patients.

BACKGROUND: To explore mechanisms of weight loss in cystic fibrosis (CF), we studied ghrelin receptor expression on isolated lymphocytes from CF subjects with different body mass indices (BMIs). Eating behavior is influenced by hormone peptides such as ghrelin, a potent appetite stimulator. However, studies on ghrelin plasma levels in CF showed it to be increased in cachectic subjects, the expected physiological response. OBJECTIVES: (1) To compare ghrelin receptor expression between clinically stable CF subjects with normal BMI, CF subjects with cachexia and healthy controls. (2) To investigate ghrelin receptor expression in the same CF subjects before and after treatment for an acute exacerbation. METHODS: Lymphocytes were isolated from CF patients with normal BMI and low BMI and from controls. Ghrelin receptor quantification was determined via flow cytometry. Body composition was determined by bioelectrical impedance, and plasma levels of ghrelin, TNF-alpha, IL-1 and IL-6 were determined. RESULTS: CF subjects with low BMI had increased inflammation evidenced by increased plasma cytokines and showed decreased lymphocytic ghrelin receptor expression. Ghrelin receptor expression in the CF group with normal BMI was similar to controls; it decreased during an acute exacerbation associated with weight loss and returned to baseline following treatment and recovery of the weight loss. CONCLUSIONS: Differences exist in ghrelin receptor expression in lymphocytes isolated from stable CF patients with different BMIs. These changes may be due to a disordered pathological response to weight loss.

Plasma ghrelin and leptin in adult cystic fibrosis patients.

BACKGROUND: Weight loss in cystic fibrosis (CF) may be associated with altered levels of appetite stimulating peptide ghrelin and the appetite decreasing peptide leptin. However, prior data on leptin in CF are conflicting, while the data on ghrelin are scarce. We hypothesized that weight loss in CF is associated with low levels ghrelin and elevated levels of leptin. METHODS: Plasma ghrelin, leptin, TNF-alpha, IL-1 and IL-6, BMI, fat free mass (FFM), fat mass (FM) were measured in 74 CF adults and 20 controls. CF subjects were divided into 3 groups based on lung disease: mild (n=19), moderate (n=30) and severe (n=25). RESULTS: Severe CF patients (% predicted FEV1 27+/-7; median BMI 21 kg/m2) had significantly elevated ghrelin and decreased leptin compared to controls and other CF subjects. Ghrelin correlated (r value, p value) with BMI (-0.35,<0.001), FFM (-0.22,<0.05), FM (-0.41,<0.0001), FEV1 (-0.62,<0.001), TNF-alpha (0.51,<0.0001), IL-1 (0.56,<0.0001), and IL-6 (0.33,<0.01). Leptin correlated (r value, p value) with BMI (0.40,<0.0001), FM (0.56,<0.0001), FEV1 (0.34,<0.05), IL-1 (-0.51,<0.05) and TNF-alpha (-0.43,<0.0001). BMI and FEV1 were independent predictors of ghrelin (-0.35,<0.05;-0.59,<0.001). FM was a predictor of leptin (0.56,<0.0001). Cytokines were elevated only in severe CF (severe CF vs. controls, pg/ml): TNF-alpha (3.4+/-0.6 vs. 1.2+/-0.4), IL-1 (3.5+/-1 vs. 0.2+/-0.1), IL-6 (17.4+/-4 vs. 2.4+/-2). CONCLUSIONS: Elevated ghrelin and decreased leptin levels are a consequence rather than a cause of weight loss in advanced CF.

Lean Methodology in Health Care.

To improve the delivery of patient care, governments and health-care institutions adopted quality improvement methods that had been developed decades earlier in manufacturing industries. Many health-care practitioners are either unaware or are inexperienced about what these practices entail and whether they are successful in health care. This article reviews Lean, an improvement philosophy made famous by the Toyota Motor Company. Lean uses a set of instruments and incorporates a long-term vision aiming for continuous improvement. It focuses on eliminating waste as perceived by the patient, thereby maximizing quality and safety for the patient. However, the effort required for the attainment of Lean's goals is often not appreciated. Indeed, successful and sustainable implementation requires immense institutional culture change combined with innovative leadership and motivated frontline health-care professionals.

Early in-hospital clinical deterioration is not predicted by severity of illness, functional status, or comorbidity.

BACKGROUND: Prior studies concentrated on unplanned intensive care unit (ICU) transfer to gauge deterioration occurring shortly following hospital admission. However, examining only ICU transfers is not ideal since patients could stabilize with treatment, refuse ICU admission, or not require ICU evaluation. To further explore etiologies of early clinical deterioration, we used rapid response team (RRT) activation within 48 hours of admission as an index of early clinical worsening. METHODS: A retrospective analysis of prospectively gathered admissions from the emergency department in an academic medical center was done. Data were reviewed independently by two physicians. We assessed severity of illness, functional status, comorbidity, the frequency of ICU and palliative care consultations, and changes in advance health care directives. RESULTS: Of 655 rapid responses (RRs) within the study period, 24.6% occurred within 48 hours of admission. Disease trajectory was the most frequent perceived reason for RRs (55.6% and 58.9%, reviewer 1 and 2, respectively) followed by medical error (15.6% and 15.2%). Acute physiology and chronic health evaluation II (APACHE-II) and modified early warning scores (MEWS) were higher at the time of RR compared to admission (p<0.0001). However, admission APACHE-II, MEWS, functional status, and comorbidity scores did not predict early RRs. One third of RRs resulted in ICU consultation and 95% were accepted. Palliative care consults were requested for 15%, the majority (65%) after RR and all resulting in advance directive change. CONCLUSION: Disease trajectory accounted for most clinical deterioration and medical error contributed to 15%. Our data suggest that it is difficult to predict early clinical deterioration as none of the measured parameters were associated with RRT activation.

CF healthcare workers feel unprepared in providing suitable end of life care and desire more education: Results of a nationwide survey.

INTRODUCTION: Little is known about the depth of knowledge and preparedness of CF caregivers in delivering end of life and palliative care to CF patients and families. METHOD: Nationwide survey questionnaires for CF care providers using the CF Foundation Listserv electronic web-based tool. RESULTS: The majority of non-physician CF care providers (55%) had more than 15 years of experience in their discipline and 84% of physician had greater than 15 years of experience. The majority reported that they felt "somewhat" or "very" involved in palliative or end of life care in their current role. Yet, when asked whether they felt adequately prepared to deliver palliative and end of life care, only 18% reported that they were "fully prepared" and 45% felt that they were only "minimally" or "not" prepared. Further, only one third of respondents received more than 10h of education in general palliative or end-of-life care, while only 10% had received more than 10h of education specific to CF end of life care. The majority (73%) of CF healthcare providers preferred more education specific to CF end of life care. CONCLUSION: CF healthcare providers are involved in CF end of life issues but a fair number did not understand their role and felt inadequately prepared in delivering suitable end of life and palliative care. Many desired more education in the provision of such care.

Advance care planning in cystic fibrosis: Current practices, challenges, and opportunities.

BACKGROUND: Studies in cystic fibrosis (CF) report late attention to advance care planning (ACP). The purpose of this study was to examine ACP with patients receiving care at US adult CF care programs. METHODS: Chart abstraction was used to examine ACP with adults with CF dying from respiratory failure between 2011 and 2013. RESULTS: We reviewed 210 deaths among 67 CF care programs. Median age at death was 29 years (range 18-73). Median FEV1 in the year preceding death was 33% predicted (range 13-100%); 68% had severe lung disease with FEV1<40% predicted. ACP was documented for 129 (61%), often during hospitalization (61%). Those with ACP had earlier documentation of treatment preferences, before the last month of life (73% v. 35%; p=<0.01). Advance directives were completed by 93% of those with ACP versus 75% without (p<0.01); DNR orders and health care proxy designation occurred more often for those with ACP. Patients awaiting lung transplant had similar rates of ACP as those who were not (67% v. 61%; p=0.55). The frequency of ACP varied significantly among the 29 programs contributing data from four or more deaths. CONCLUSIONS: ACP in CF often occurs late in the disease course. Important decisions default to surrogates when opportunities for ACP are missed. Provision of ACP varies significantly among adult CF care programs. Careful evaluation of opportunities to enhance ACP and implementation of recommended approaches may lead to better practices in this important aspect of CF care.

Medical intensive care unit consults occurring within 48 hours of admission: a prospective study.

RATIONALE: Critical care consults requested shortly after admission could represent a triage error. This consult process has not been adequately assessed, and data are retrospective relying on discharge diagnoses. OBJECTIVES: The aims of this study were to identify reasons for medical Intensive care unit (MICU) consultations within 48 hours of admission and to detect differences between those accepted and those denied MICU admission. METHODS: Data were prospectively collected including demographics, reason for consultation, Acute Physiology and Chronic Health Evaluation II score, Elixhauser comorbidity measure, functional status, need for assisted ventilation or vasopressor, presence of do-not-resuscitate (DNR) order, and whether a DNR order was obtained after MICU consultation. RESULTS: Ninety-four percent of patients consulted were not initially evaluated in the emergency department, half of whom were accepted. Respiratory failure, sepsis, and alcohol withdrawal were the most frequent reasons for MICU transfers. Factors predicting MICU admission included respiratory illness, better baseline functional status, and less comorbidity, whereas DNR predicted rejection. We did not find differences in hospital mortality; but hospital length of stay was longer. CONCLUSIONS: Prospective examination of the consult process suggests that disease progression rather than triage error accounted for most unplanned transfers. Functional status and comorbidity predicted MICU admission rather than illness severity. Goals of care were not being discussed adequately. We did not detect differences in mortality although hospital length of stay was increased.

A quality improvement project to decrease emergency department and medical intensive care unit transfer times.

OBJECTIVE: To reduce transfer time of critically ill patients from the emergency department (ED) to the medical intensive care unit (MICU). DESIGN: A prospective, observational study assessing preimplementation and postimplementation of quality improvement interventions in a tertiary academic medical center. INTERVENTIONS: A team of frontline health care professional including ED, MICU, and supporting services using the clinical microsystems approach mapped out existing practice patterns, determined causes for delays, and used the Plan-Do-Study-Act to test changes. Measurements and Main Results The team identified multiple issues that contributed to delays. These included poor coordination between transport services, respiratory therapy, and nursing in transferring patients from the ED as well delays in identification and transfer of stable MICU patients. These interventions reduced transfer time from 4.2 (3.4-5.7) hours to 2.2 (1.4-3.1) hours (median [interquartile range]; P<.001). Hospital length of stay decreased from 9.9±9 to 8.3±7 days (P<.03). CONCLUSION: A team made up of frontline health care professionals using a structured quality improvement process and implementing multifaceted, multistage interventions, reduced transfer delays, and length of stay. Added benefits included engagement among members of the 2 microsystems and a more cohesive approach to patient care.

Body composition and resting energy expenditure in clinically stable, non-weight-losing patients with severe emphysema.

STUDY OBJECTIVES: To characterize the metabolic status of weight-stable and clinically stable individuals with advanced emphysema. PATIENTS: Seventy-nine patients with severe emphysema (FEV(1), 29 +/- 13% of predicted [mean +/- SD]) evaluated for enrollment in the National Emphysema Treatment Trial and 20 age-matched healthy subjects were studied. SETTING: Pulmonary function laboratory of university-affiliated teaching hospital. INTERVENTIONS: Data collection. MEASUREMENTS AND RESULTS: We measured lung function, body composition, serum leptin levels, serum tumor necrosis factor receptors (sTNF-Rs), resting oxygen consumption (RVO(2)) normalized to weight in kilograms (RVO(2)/kg), and RVO(2) normalized to fat-free mass (FFM) [RVO(2)/FFM]. The patient group and healthy group had similar age, body mass index (BMI), and body composition. RVO(2)/kg, RVO(2)/FFM, and sTNF-R levels were higher in patients compared to healthy subjects. There were no differences in serum leptin levels between emphysematous and healthy subjects, and there was no correlation between leptin and sTNF-R and RVO(2)/kg. Furthermore, both groups had similar gender-related differences in FFM, percentage of body fat, and serum leptin levels. Patients with lower BMI showed the greatest differences from control subjects in RVO(2)/kg. CONCLUSION: In weight-stable subjects with advanced emphysema, RVO(2)/kg and RVO(2)/FFM were higher compared to healthy subjects, especially in those with BMI in the lower end of the normal range. RVO(2)/kg and RVO(2)/FFM did not correlate with leptin or sTNF-R levels. These data show that a higher metabolic rate is found in patients with emphysema who are clinically and weight stable. Thus, hypermetabolism is a feature of the disease and not sufficient to lead to weight loss.

The effect of point-of-care ultrasonography on imaging studies in the medical ICU: a comparative study.

BACKGROUND: Point-of-care ultrasonography performed by frontline intensivists offers the possibility of reducing the use of traditional imaging in the medical ICU (MICU). We compared the use of traditional radiographic studies between two MICUs: one where point-of-care ultrasonography is used as a primary imaging modality, the other where it is used only for procedure guidance. METHODS: This study was a retrospective 3-month chart review comparing the use of chest radiographs, CT scans (chest and abdomen/pelvis), transthoracic echocardiography performed by the cardiology service, and DVT ultrasonography studies performed by the radiology service between two MICUs of similar size and acuity and staffing levels. RESULTS: Total number of admissions, patient demographics, and disease acuity were similar between MICUs. Comparing the non-point-of-care ultrasonography MICU with the point-of-care ultrasonography MICU, there were 3.75 ± 4.6 vs 0.82 ± 1.85 (P < .0001) chest radiographs per patient, 0.10 ± 0.31 vs 0.04 ± 0.20 (P = .0007) chest CT scans per patient, 0.17 ± 0.44 vs 0.05 ± 0.24 (P < .0001) abdomen/pelvis CT scans per patient, 0.20 ± 0.47 vs 0.02 ± 0.14 (P < .0001) radiology service-performed DVT studies per patient, and 0.18 ± 0.40 vs 0.07 ± 0.26 (P < .0001) cardiology service-performed transthoracic echocardiography studies per patient, respectively. CONCLUSIONS: The use of point-of-care ultrasonography in an MICU is associated with a significant reduction in the number of imaging studies performed by the radiology and cardiology services.