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Kuhn J, Banerjee P, Haye A, Robinson DN, Iglesias PA, Devreotes PN. Complementary Cytoskeletal Feedback Loops Control Signal Transduction Excitability and Cell Polarity. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.13.580131. [PMID: 38405988 PMCID: PMC10888828 DOI: 10.1101/2024.02.13.580131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/27/2024]
Abstract
To move through complex environments, cells must constantly integrate chemical and mechanical cues. Signaling networks, such as those comprising Ras and PI3K, transmit chemical cues to the cytoskeleton, but the cytoskeleton must also relay mechanical information back to those signaling systems. Using novel synthetic tools to acutely control specific elements of the cytoskeleton in Dictyostelium and neutrophils, we delineate feedback mechanisms that alter the signaling network and promote front- or back-states of the cell membrane and cortex. First, increasing branched actin assembly increases Ras/PI3K activation while reducing polymeric actin levels overall decreases activation. Second, reducing myosin II assembly immediately increases Ras/PI3K activation and sensitivity to chemotactic stimuli. Third, inhibiting branched actin alone increases cortical actin assembly and strongly blocks Ras/PI3K activation. This effect is mitigated by reducing filamentous actin levels and in cells lacking myosin II. Finally, increasing actin crosslinking with a controllable activator of cytoskeletal regulator RacE leads to a large decrease in Ras activation both globally and locally. Curiously, RacE activation can trigger cell spreading and protrusion with no detectable activation of branched actin nucleators. Taken together with legacy data that Ras/PI3K promotes branched actin assembly and myosin II disassembly, our results define front- and back-promoting positive feedback loops. We propose that these loops play a crucial role in establishing cell polarity and mediating signal integration by controlling the excitable state of the signal transduction networks in respective regions of the membrane and cortex. This interplay enables cells to navigate intricate topologies like tissues containing other cells, the extracellular matrix, and fluids.
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Lin Y, Pal DS, Banerjee P, Banerjee T, Qin G, Deng Y, Borleis J, Iglesias PA, Devreotes PN. Ras-mediated homeostatic control of front-back signaling dictates cell polarity. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.08.30.555648. [PMID: 37693515 PMCID: PMC10491231 DOI: 10.1101/2023.08.30.555648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
Studies in the model systems, Dictyostelium amoebae and HL-60 neutrophils, have shown that local Ras activity directly regulates cell motility or polarity. Localized Ras activation on the membrane is spatiotemporally regulated by its activators, RasGEFs, and inhibitors, RasGAPs, which might be expected to create a stable 'front' and 'back', respectively, in migrating cells. Focusing on C2GAPB in amoebae and RASAL3 in neutrophils, we investigated how Ras activity along the cortex controls polarity. Since existing gene knockout and overexpression studies can be circumvented, we chose optogenetic approaches to assess the immediate, local effects of these Ras regulators on the cell cortex. In both cellular systems, optically targeting the respective RasGAPs to the cell front extinguished existing protrusions and changed the direction of migration, as might be expected. However, when the expression of C2GAPB was induced globally, amoebae polarized within hours. Furthermore, within minutes of globally recruiting either C2GAPB in amoebae or RASAL3 in neutrophils, each cell type polarized and moved more rapidly. Targeting the RasGAPs to the cell backs exaggerated these effects on migration and polarity. Overall, in both cell types, RasGAP-mediated polarization was brought about by increased actomyosin contractility at the back and sustained, localized F-actin polymerization at the front. These experimental results were accurately captured by computational simulations in which Ras levels control front and back feedback loops. The discovery that context-dependent Ras activity on the cell cortex has counterintuitive, unanticipated effects on cell polarity can have important implications for future drug-design strategies targeting oncogenic Ras.
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Yang Q, Miao Y, Banerjee P, Hourwitz MJ, Hu M, Qing Q, Iglesias PA, Fourkas JT, Losert W, Devreotes PN. Nanotopography modulates intracellular excitable systems through cytoskeleton actuation. Proc Natl Acad Sci U S A 2023; 120:e2218906120. [PMID: 37126708 PMCID: PMC10175780 DOI: 10.1073/pnas.2218906120] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 03/21/2023] [Indexed: 05/03/2023] Open
Abstract
Cellular sensing of most environmental cues involves receptors that affect a signal-transduction excitable network (STEN), which is coupled to a cytoskeletal excitable network (CEN). We show that the mechanism of sensing of nanoridges is fundamentally different. CEN activity occurs preferentially on nanoridges, whereas STEN activity is constrained between nanoridges. In the absence of STEN, waves disappear, but long-lasting F-actin puncta persist along the ridges. When CEN is suppressed, wave propagation is no longer constrained by nanoridges. A computational model reproduces these experimental observations. Our findings indicate that nanotopography is sensed directly by CEN, whereas STEN is only indirectly affected due to a CEN-STEN feedback loop. These results explain why texture sensing is robust and acts cooperatively with multiple other guidance cues in complex, in vivo microenvironments.
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McGregor G, Powell R, Begg B, Birkett ST, Nichols S, Ennis S, McGuire S, Prosser J, Fiassam O, Hee SW, Hamborg T, Banerjee P, Hartfiel N, Charles JM, Edwards RT, Drane A, Ali D, Osman F, He H, Lachlan T, Haykowsky MJ, Ingle L, Shave R. High-intensity interval training in cardiac rehabilitation (HIIT or MISS UK): A multi-centre randomised controlled trial. Eur J Prev Cardiol 2023:7031580. [PMID: 36753063 DOI: 10.1093/eurjpc/zwad039] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Revised: 01/09/2023] [Accepted: 02/07/2023] [Indexed: 02/09/2023]
Abstract
BACKGROUND There is a lack of international consensus regarding the prescription of high-intensity interval exercise training (HIIT) for people with coronary artery disease (CAD) attending cardiac rehabilitation (CR). AIM To assess the clinical effectiveness and safety of low-volume HIIT compared with moderate intensity steady-state (MISS) exercise training for people with CAD. METHODS We conducted a multi-centre RCT, recruiting 382 patients from 6 outpatient CR centres. Participants were randomised to twice-weekly HIIT (n = 187) or MISS (n = 195) for 8 weeks. HIIT consisted of 10 × 1-minute intervals of vigorous exercise (>85% maximum capacity) interspersed with 1-minute periods of recovery. MISS was 20-40 minutes of moderate intensity continuous exercise (60-80% maximum capacity). The primary outcome was the change in cardiorespiratory fitness (peak oxygen uptake, VO2 peak) at 8-week follow-up. Secondary outcomes included cardiovascular disease risk markers, cardiac structure and function, adverse events, and health-related quality of life. RESULTS At 8 weeks, VO2 peak improved more with HIIT (2.37 mL.kg-1.min-1; SD, 3.11) compared with MISS (1.32 mL.kg-1.min-1; SD, 2.66). After adjusting for age, sex and study site, the difference between arms was 1.04 mL.kg-1.min-1 (95% CI, 0.38 to 1.69; p = 0.002). Only 1 serious adverse event was possibly related to HIIT. CONCLUSIONS In stable CAD, low-volume HIIT improved cardiorespiratory fitness more than MISS by a clinically meaningful margin. Low-volume HIIT is a safe, well tolerated, and clinically effective intervention that produces short-term improvement in cardiorespiratory fitness. It should be considered by all CR programmes as an adjunct or alternative to MISS. TRIAL REGISTRATION ClinicalTrials.gov: NCT02784873. https://clinicaltrials.gov/ct2/show/NCT02784873.
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Stead T, Voter M, Ganti L, Banerjee P, Banerjee A. 167 Predictors of Sustained ROSC and Good Neurologic Outcome After PEA Arrest. Ann Emerg Med 2022. [DOI: 10.1016/j.annemergmed.2022.08.191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Banerjee P, Yang Q, Devreotes PN, Losert W, Iglesias PA. Modeling actin polymerization wave patterns on mechanical ridges via dynamical networks. Biophys J 2022. [DOI: 10.1016/j.bpj.2021.11.2128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Ali D, Tran P, Weight N, Ennis S, Weickert M, Miller M, Cappuccio F, Banerjee P. Heart failure with preserved ejection fraction (HFpEF) pathophysiology study (IDENTIFY-HF): rise in arterial stiffness associates with HFpEF with increase in comorbidities. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.0722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
There has been a shift in paradigm proposing that comorbidities play a significant role towards the pathophysiology of the heart failure with preserved ejection fraction (HFpEF) syndrome. Further, HFpEF patients have abnormal macrovascular function, potentially contributing significantly in altered ventricular-vascular coupling in these patients. However, our full understanding of the role of comorbidities, arterial stiffness and it relationship with HFpEF remains incomplete.
Purpose
The IDENTIFY-HF study aims to shed light on the HFpEF pathophysiology and investigates whether gradually increase in arterial stiffness (in addition to ageing) due to increasing common comorbidities, such as hypertension and diabetes, is associated with HFpEF.
Methods
Arterial compliance was assessed in five groups (Groups A to E) matched for age, (≥70 years), sex and renal function: Group A; normal healthy volunteers without major comorbidities (control). Group B; patients with hypertension only. Group C; patients with hypertension and diabetes mellitus only. Group D; patients with HFpEF. Group E; patients with heart failure and reduced ejection fraction (HFrEF); the parallel group. Arterial compliance was assessed using pulse wave velocity (PWV), as the primary outcome measure and was compared between Group A to D. A separate comparison was made between Groups D and E. To avoid confounding factors, participants were asked to omit their morning blood pressure medication and abstain from caffeine for 12 hours prior to the study.
Results
From the 95 volunteers recruited, PWV was obtained in 94 subjects. The mean PWV in group A, B, C, D and E was 10.2-, 12.2-, 13.0-, 13.7- and 10.0 m/s respectively. After adjusting for covariance (age, sex, BMI and renal function), the mean difference between Group A (healthy volunteers) and D (HFpEF) was 2.14 m/s (p=0.023). Whilst the mean difference between the HFpEF and HFrEF group D and E respectively was 2.68 m/s (p=0.003).
Conclusion
Rise in comorbidities increases arterial stiffness, as measured by pulse wave velocity, which in turn significantly associates with HFpEF (p=0.023). It is therefore possible that the HFpEF syndrome may not be due to a primary cardiac pathology but rather an end-result of non-cardiac comorbidities affecting vascular resistance with perhaps some secondary cardiac involvement.
Funding Acknowledgement
Type of funding sources: Public Institution(s). Main funding source(s): 1)West Midlands Clinical Research Network, National Institute of Health Research, UK2)Research, Development & Innovation department of the University Hospitals Coventry & Warwickshire NHS Trust (RDI, UHCW), UK.
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Tran P, Marshall L, Patchett I, Yusuf S, Panikker S, Banerjee P, Osman F, Kuehl M, Dhanjal T. Real-world evaluation of follow up strategies after implantable cardiac-defibrillator therapies in patients with ventricular tachycardia (REFINE-VT). Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.0652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Implantable cardiac-defibrillators (ICD) can prevent sudden cardiac death but the risk of recurrent ventricular arrhythmia (VA) and ICD therapies persists. Established strategies to minimize such risks include medication optimization, device reprogramming or ventricular tachycardia (VT) catheter ablation (CA). However, the timing and choice of these strategies at ICD follow-up may not be as consistent in the real-world as the regulated conditions of clinical trials. Furthermore, whether these decisions at follow-up are influenced by the type of arrhythmia, ICD therapy or patient characteristics remain unclear.
Purpose
We evaluated ICD follow-up strategies in patients with ischaemic (ICM) and non-ischaemic cardiomyopathy (NICM) to refine the outpatient management of these complex patients and ultimately improve overall patient outcome.
Methods
REFINE-VT is a retrospective study of 514 patients with ICD/CRT-D who attended ICD follow-up between June 2018 to September 2019 at the University Hospital Coventry & Warwickshire (UHCW) tertiary cardiology department. All follow-ups were face-to-face. Patients were divided into 2 groups according to the absence or presence of sustained VA (e.g. >30 seconds of VT and/or appropriate ICD therapy), described as “negative event” and “positive event” groups respectively. The type of strategy employed in response to a positive event were categorized into 4 groups: (1) Medication change only (2) Device programming +/− medication (3) Referral for VT CA (4) No intervention
Results
514 consecutive patients with ICD (52%) or CRT-D (48%) were analysed. Overall mean age was 67±14 years with 79% male patients. ICM was diagnosed in 329 (64%) patient and NICM in 185 (36%). 437 (85%) patients had no significant VA and/or ICD therapy referred to as the negative group. A total of 77 patients (15%) suffered VA and/or ICD therapies, of whom 22 patients (26%) experienced a second event. 31% (n=24) of this positive event group received no preventative strategy (Table 1). We observed an inconsistent approach to the choice of strategies across different types of arrhythmias and ICD therapies. E.g. the odds of intervening were significantly higher if ICD shock was detected compared to anti-tachycardia pacing (OR 8.4, 95% CI 1.7–39.6, p=0.007). Even in patients with two events, the rate of referral for VT ablation and escalation of antiarrhythmics were similarly as low as patients with a single event (Table 2).
Conclusion
This is the first contemporary study that has evaluated how strategies that reduce the risk of recurrent ICD events are executed in a real-world population. We have demonstrated that the decision to intervene and choices of strategy remain inconsistent and partially biased by the type of arrhythmia and ICD therapy at follow-up. This supports the need for an evidence-driven multi-disciplinary VT clinic to refine and standardize our approach to this heterogeneous population.
Funding Acknowledgement
Type of funding sources: None.
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Stead T, Banerjee P, Ganti L. 164 Correlation of Out-of-Hospital Los Angeles Motor Score to Hospital Stroke Severity as Measured by the National Institutes of Stroke Scale. Ann Emerg Med 2021. [DOI: 10.1016/j.annemergmed.2021.09.175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Rosenson R, Gaudet D, Ballantyne C, Baum S, Bergeron J, Kershaw E, Moriarty P, Rubba P, Banerjee P, Ponda M, Pordy R, Son V, Rader D. A phase 2 trial of the efficacy and safety of evinacumab in patients with severe hypertriglyceridemia. Atherosclerosis 2021. [DOI: 10.1016/j.atherosclerosis.2021.06.901] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Banerjee P, Ganti L, Stead T, Campion B. 34 Polk COVID-19 and Flu Response Clinical Trial. Ann Emerg Med 2021. [PMCID: PMC8335489 DOI: 10.1016/j.annemergmed.2021.07.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Reeskamp L, Greber-Platzer S, Saheb S, Stefanutti C, Stroes E, Ali S, Banerjee P, Pordy R, Zhao J, Raal F. Evinacumab markedly reduces low-density lipoprotein cholesterol in adolescent patients with homozygous familial hypercholesterolemia. Atherosclerosis 2021. [DOI: 10.1016/j.atherosclerosis.2021.06.141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Jagun O, Banerjee P, Thompson D, Taylor M. The Skin of Colour Training Day UK: training the medical workforce in ethnic dermatology. Clin Exp Dermatol 2021; 47:245-246. [PMID: 34115898 DOI: 10.1111/ced.14800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 06/10/2021] [Indexed: 12/01/2022]
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Alwan W, Banerjee P. Evaluating the baseline experience, attitudes and educational needs of newly appointed Dermatology trainees: results of a 5-year study. Clin Exp Dermatol 2021; 46:1328-1330. [PMID: 33896025 DOI: 10.1111/ced.14705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 04/20/2021] [Indexed: 10/21/2022]
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O’Neill H, Narang I, Buckley D, Phillips T, Bertram C, Bleiker T, Chowdhury M, Cooper S, Abdul Ghaffar S, Johnston G, Kiely L, Sansom J, Stone N, Thompson D, Banerjee P. Occupational dermatoses during the COVID‐19 pandemic: a multicentre audit in the UK and Ireland. Br J Dermatol 2020; 184:575-577. [PMID: 33111978 PMCID: PMC9619482 DOI: 10.1111/bjd.19632] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 10/22/2020] [Accepted: 10/25/2020] [Indexed: 12/17/2022]
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Mahato S, Santra A, Dan S, Verma P, Banerjee P, Bose A. Visibility Anomaly of GNSS Satellite and Support from Regional Systems. CURR SCI INDIA 2020. [DOI: 10.18520/cs/v119/i11/1774-1782] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Raal F, Rosenson R, Reeskamp L, Kastelein J, Baum S, Ali S, Banerjee P, Chan KC, Gipe D, Pordy R, Gaudet D. The efficacy and safety of evinacumab in homozygous familial hypercholesterolaemia (HoFH) patients with little to no low-density lipoprotein receptor (LDLR) activity. Atherosclerosis 2020. [DOI: 10.1016/j.atherosclerosis.2020.10.038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Hernandez M, Chamorro M, Elfman J, Webb A, Plamootil C, Ganti L, Banerjee P. 218 Outcomes after Reversal of Anticoagulation after Intracerebral Hemorrhage. Ann Emerg Med 2020. [DOI: 10.1016/j.annemergmed.2020.09.231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kaur G, Saravana S, Banerjee P, Kumar M, Khurana D. Influence of dyslipidemia on multiple sclerosis disease activity. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.1400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Stead T, Banerjee P, Ganti L. 3 A High Los Angeles Motor Scale Score is an Effective Tool for Triaging Stroke Patients in the Out-of-Hospital Setting. Ann Emerg Med 2019. [DOI: 10.1016/j.annemergmed.2019.08.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Banerjee P, Vera A, Ganti L, Singh A, Dub L, Wallen M, Tsau J, Pepe P. 228 Every Second Counts: Time to Epinephrine and Return of Spontaneous Circulation After Pediatric Cardiac Arrest. Ann Emerg Med 2018. [DOI: 10.1016/j.annemergmed.2018.08.233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Webb A, Roka A, Landeta J, Patel S, Banerjee P, Ganti L. 344 Prognostic Indicators of Being Discharged Home After an Ischemic Stroke. Ann Emerg Med 2018. [DOI: 10.1016/j.annemergmed.2018.08.349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Kramer N, Leon L, Rosario J, Dub L, Lebowitz D, Vera A, Amico K, Banerjee P, Ganti L. 222 Delta Lactate (3-Hour Lactate Minus Initial Lactate) Predicts In-Hospital Death in Sepsis Patients. Ann Emerg Med 2018. [DOI: 10.1016/j.annemergmed.2018.08.227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Dub L, Lebowitz D, Kramer N, Leon L, Rosario J, Amico K, Vera A, Banerjee P, Ganti L. 198 Adherence to Standardized Sepsis Order Set Associated With Lower 30-Day Hospital Re-Admission Rate. Ann Emerg Med 2018. [DOI: 10.1016/j.annemergmed.2018.08.203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Roka A, Landeta J, Webb A, Patel S, Banerjee P, Ganti L. 345 Impact of Emergency Department Blood Pressure on Stroke Severity. Ann Emerg Med 2018. [DOI: 10.1016/j.annemergmed.2018.08.350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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