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Luk C, Bridge KI, Warmke N, Simmons KJ, Drozd M, Moran A, MacCannell ADV, Cheng CW, Straw S, Scragg JL, Smith J, Ozber CH, Wilkinson CG, Skromna A, Makava N, Prag HA, Simon Futers T, Brown OI, Bruns AF, Walker AM, Watt NT, Mughal R, Griffin KJ, Yuldasheva NY, Limumpornpetch S, Viswambharan H, Sukumar P, Beech DJ, Vidal-Puig A, Witte KK, Murphy MP, Hartley RC, Wheatcroft SB, Cubbon RM, Roberts LD, Kearney MT, Haywood NJ. Paracrine role of endothelial IGF-1 receptor in depot-specific adipose tissue adaptation in male mice. Nat Commun 2025; 16:170. [PMID: 39747815 PMCID: PMC11696296 DOI: 10.1038/s41467-024-54669-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 11/18/2024] [Indexed: 01/04/2025] Open
Abstract
During recent decades, changes in lifestyle have led to widespread nutritional obesity and its related complications. Remodelling adipose tissue as a therapeutic goal for obesity and its complications has attracted much attention and continues to be actively explored. The endothelium lines all blood vessels and is close to all cells, including adipocytes. The endothelium has been suggested to act as a paracrine organ. We explore the role of endothelial insulin-like growth factor-1 receptor (IGF-1R), as a paracrine modulator of white adipose phenotype. We show that a reduction in endothelial IGF-1R expression in the presence of high-fat feeding in male mice leads to depot-specific beneficial white adipose tissue remodelling, increases whole-body energy expenditure and enhances insulin sensitivity via a non-cell-autonomous paracrine mechanism. We demonstrate that increased endothelial malonate may be contributory and that malonate prodrugs have potentially therapeutically relevant properties in the treatment of obesity-related metabolic disease.
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Khalid S, Heather T, Palin V, Brown OI, Drozd M. Navigating UK internal medicine training applications: 10 essential tips. Postgrad Med J 2024:qgae190. [PMID: 39724927 DOI: 10.1093/postmj/qgae190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2024] [Accepted: 12/07/2024] [Indexed: 12/28/2024]
Abstract
Internal medicine training applications in the UK have become increasingly competitive. This article provides ten tips for optimizing internal medicine training applications covering portfolio development, teaching experience, project selection, and interview preparation. We outline strategies for maximizing application scores through efficient resource allocation, effective project selection, and structured interview preparation. These tips are designed to help candidates navigate the competitive selection process while developing skills valuable for their future medical careers.
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Joseph T, Brown OI, Khalid S, Giannoudi M, Sagar RC, Bunola-Hadfield E, Chapman SJ, A Slater T, Straw S, Drozd M. Dexterity assessment of hospital workers: prospective comparative study. BMJ 2024; 387:e081814. [PMID: 39706594 DOI: 10.1136/bmj-2024-081814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2024]
Abstract
OBJECTIVES To compare the manual dexterity and composure under pressure of people in different hospital staff roles using a buzz wire game. DESIGN Prospective, observational, comparative study (Tremor study). SETTING Leeds Teaching Hospitals NHS Trust, Leeds, UK, during a three week period in 2024. PARTICIPANTS 254 hospital staff members comprising of 60 physicians, 64 surgeons, 69 nurses, and 61 non-clinical staff. MAIN OUTCOME MEASURES Successful completion of the buzz wire game within five minutes and occurrence of swearing and audible noises of frustration. RESULTS Of the 254 hospital staff that participated, surgeons had significantly higher success rates in completing the buzz wire game within five minutes (84%, n=54) compared with physicians (57%, n=34), nurses (54%, n=37), and non-clinical staff (51%, n=31) (P<0.001). Time-to-event analysis showed that surgeons were quicker to successfully complete the game, independent of age and gender. Surgeons exhibited the highest rate of swearing during the game (50%, n=32), followed by nurses (30%, n=21), physicians (25%, n=60), and non-clinical staff (23%, n=14) (P=0.004). Non-clinical staff showed the highest use of frustration noises (75%), followed by nurses (68%), surgeons (58%), and physicians (52%) (P=0.03). CONCLUSIONS Surgeons showed greater dexterity, but higher levels of swearing compared with other hospital staff roles, while nurses and non-clinical staff showed the highest rates of audible noises of frustration. The study highlights the diverse skill sets across hospital staff roles. Implementation of a surgical swear jar initiative should be considered for future fundraising events.
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Conning-Rowland MS, Giannoudi M, Drozd M, Brown OI, Yuldasheva NY, Cheng CW, Meakin PJ, Straw S, Gierula J, Ajjan RA, Kearney MT, Levelt E, Roberts LD, Griffin KJ, Cubbon RM. The diabetic myocardial transcriptome reveals Erbb3 and Hspa2 as a novel biomarkers of incident heart failure. Cardiovasc Res 2024; 120:1898-1906. [PMID: 39180332 PMCID: PMC11629987 DOI: 10.1093/cvr/cvae181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 06/18/2024] [Accepted: 07/14/2024] [Indexed: 08/26/2024] Open
Abstract
AIMS Diabetes mellitus (DM) increases heart failure incidence and worsens prognosis, but its molecular basis is poorly defined in humans. We aimed to define the diabetic myocardial transcriptome and validate hits in their circulating protein form to define disease mechanisms and biomarkers. METHODS AND RESULTS RNA-sequencing data from the Genotype-Tissue Expression (GTEx) project was used to define differentially expressed genes (DEGs) in right atrial (RA) and left ventricular (LV) myocardium from people with vs. without DM (type 1 or 2). DEGs were validated as plasma proteins in the UK Biobank cohort, searching for directionally concordant differential expression. Validated plasma proteins were characterized in UK Biobank participants, irrespective of diabetes status, using cardiac magnetic resonance imaging, incident heart failure, and cardiovascular mortality. We found 32 and 32 DEGs associated with DM in the RA and LV, respectively, with no overlap between these. Plasma proteomic data were available for 12, with ERBB3, NRXN3, and HSPA2 (all LV hits) exhibiting directional concordance. Irrespective of DM status, lower circulating ERBB3 and higher HSPA2 were associated with impaired LV contractility and higher LV mass. Participants in the lowest quartile of circulating ERBB3 or highest quartile of circulating HSPA2 had increased incident heart failure and cardiovascular death vs. all other quartiles. CONCLUSION DM is characterized by lower Erbb3 and higher Hspa2 expression in the myocardium, with directionally concordant differences in their plasma protein concentration. These are associated with LV dysfunction, incident heart failure, and cardiovascular mortality.
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Drozd M, Hamilton F, Cheng CW, Lillie PJ, Brown OI, Chaddock N, Savic S, Naseem K, Iles MM, Morgan AW, Kearney MT, Cubbon RM. Plasma MERTK is causally associated with infection mortality. J Infect 2024; 89:106262. [PMID: 39241967 DOI: 10.1016/j.jinf.2024.106262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2024] [Revised: 08/26/2024] [Accepted: 08/28/2024] [Indexed: 09/09/2024]
Abstract
BACKGROUND Infectious diseases are a major cause of mortality in spite of existing public health, anti-microbial and vaccine interventions. We aimed to define plasma proteomic associates of infection mortality and then apply Mendelian randomisation (MR) to yield biomarkers that may be causally associated. METHODS We used UK Biobank plasma proteomic data to associate 2923 plasma proteins with infection mortality before 31st December 2019 (240 events in 52,520 participants). Since many plasma proteins also predict non-infection mortality, we focussed on those associated with >1.5-fold risk of infection mortality in an analysis excluding survivors. Protein quantitative trait scores (pQTS) were then used to identify whether genetically predicted protein levels also associated with infection mortality. To conduct Two Sample MR, we performed a genome-wide association study (GWAS) of infection mortality using UK Biobank participants without plasma proteomic data (n = 363,953 including 984 infection deaths). FINDINGS After adjusting for clinical risk factors, 1142 plasma proteins were associated with risk of infection mortality (false discovery rate <0.05). 259 proteins were associated with >1.5-fold increased risk of infection versus non-infection mortality. Of these, we identified genetically predicted increasing MERTK concentration was associated with increased risk of infection mortality. MR supported a causal association between increasing plasma MERTK protein and infection mortality (odds ratio 1.46 per unit; 95% CI 1.15- 1.85; p = 0.002). CONCLUSION Plasma MERTK is causally associated with infection mortality and warrants exploration as a potential therapeutic target.
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Walker AM, Watt NT, Yuldasheva NY, Dalmia S, Conning-Rowland M, Cheng CW, Warmke N, Bridge K, Brown OI, Luk C, Drozd M, Haywood NJ, Skromna A, Makava N, Wheatcroft SB, Kearney MT, Cubbon RM. Distinct, common and synergistic effects of insulin and IGF-1 receptors on healthy murine ageing. Heliyon 2024; 10:e36457. [PMID: 39247377 PMCID: PMC11379992 DOI: 10.1016/j.heliyon.2024.e36457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2024] [Revised: 07/29/2024] [Accepted: 08/15/2024] [Indexed: 09/10/2024] Open
Abstract
Objective Reduced IGF-1 signalling is an evolutionarily conserved mediator of longevity, yet the magnitude of this effect is substantially larger in organisms retaining a common insulin and IGF-1 receptor. Whether this reflects the failure to simultaneously reduce IGF-1 and insulin signalling in mammalian model systems remains unexplored, as is the associated impact on markers of healthy ageing. We set out to address these uncertainties. Methods We compared the duration of healthy life (healthspan) in male mice with haploinsufficiency of the insulin receptor (IRKO), IGF-1 receptor (IGF-1RKO), or both (DKO), versus wildtype (WT) littermates. Cognitive performance was defined using nesting studies at 3- and 24-months of age. Brain transcriptome was characterised at 3- and 18-months of age using RNA-seq. Results Healthspan was longer in DKO versus WT, with IRKO and IGF-1RKO being intermediate. At 2 years of age, DKO also exhibited preserved nesting behaviour in contrast with all other genotypes. Differential insulin sensitivity or weight gain during ageing did not explain the preserved healthspan of DKO, since these were comparable to IRKO littermates. Brain transcriptomics at 18 months of age revealed lower expression of canonical ageing-associated genes in DKO versus WT, although many of these findings were replicated in IRKO versus WT or IGF-1RKO vs WT. Conclusions Reduced insulin and IGF-1 receptor expression have both common and synergistic effects upon elements of healthy mammalian ageing, suggesting future ageing studies should consider targeting both insulin and IGF-1 signalling.
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Brown OI, Bridge KI, Straw S, Makava N, Scragg J, Limumpornpetch S, Luk C, Smith J, Skromna A, Bruns AF, Sukumar P, Roberts LD, Cubbon R, Witte KK, Wheatcroft S, Kearney MT. Studying Adipose Endothelial Cell/Adipocyte Cross-Talk in Human Subcutaneous Adipose Tissue. J Vis Exp 2024. [PMID: 38647333 DOI: 10.3791/66608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024] Open
Abstract
Microvascular endothelial cells (MVECs) have many critical roles, including control of vascular tone, regulation of thrombosis, and angiogenesis. Significant heterogeneity in endothelial cell (EC) genotype and phenotype depends on their vascular bed and host disease state. The ability to isolate MVECs from tissue-specific vascular beds and individual patient groups offers the opportunity to directly compare MVEC function in different disease states. Here, using subcutaneous adipose tissue (SAT) taken at the time of insertion of cardiac implantable electronic devices (CIED), we describe a method for the isolation of a pure population of functional human subcutaneous adipose tissue MVEC (hSATMVEC) and an experimental model of hSATMVEC-adipocyte cross-talk. hSATMVEC were isolated following enzymatic digestion of SAT by incubation with anti-CD31 antibody-coated magnetic beads and passage through magnetic columns. hSATMVEC were grown and passaged on gelatin-coated plates. Experiments used cells at passages 2-4. Cells maintained classic features of EC morphology until at least passage 5. Flow cytometric assessment showed 99.5% purity of isolated hSATMVEC, defined as CD31+/CD144+/CD45-. Isolated hSATMVEC from controls had a population doubling time of approximately 57 h, and active proliferation was confirmed using a cell proliferation imaging kit. Isolated hSATMVEC function was assessed using their response to insulin stimulation and angiogenic tube-forming potential. We then established an hSATMVEC-subcutaneous adipocyte co-culture model to study cellular cross-talk and demonstrated a downstream effect of hSATMVEC on adipocyte function. hSATMVEC can be isolated from SAT taken at the time of CIED insertion and are of sufficient purity to both experimentally phenotype and study hSATMVEC-adipocyte cross-talk.
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Cuthbert JJ, Brown OI, Pellicori P, Dobbs K, Bulemfu J, Kazmi S, Sokoreli I, Pauws SC, Riistama JM, Cleland JGF, Clark AL. Medicines optimization prior to discharge in patients admitted to hospital with heart failure. ESC Heart Fail 2024; 11:950-961. [PMID: 38229241 DOI: 10.1002/ehf2.14638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 10/25/2023] [Accepted: 11/28/2023] [Indexed: 01/18/2024] Open
Abstract
AIMS Approximately half of patients with heart failure and a reduced ejection fraction (HeFREF) are discharged from hospital on triple therapy [angiotensin-converting enzyme inhibitors (ACE-Is) or angiotensin receptor blockers (ARBs), beta-blockers (BBs), and mineralocorticoid receptor antagonists (MRAs)]. We investigated what proportion of patients are on optimal doses prior to discharge and how many might be eligible for initiation of sacubitril-valsartan or sodium-glucose co-transporter-2 inhibitors (SGLT2Is). METHODS AND RESULTS Between 2012 and 2017, 1277 patients admitted with suspected heart failure were enrolled at a single hospital serving a local community around Kingston upon Hull, UK. Eligibility for sacubitril-valsartan or SGLT2I was based on entry criteria for the PIONEER-HF, DAPA-HF, and EMPEROR-Reduced trials. Four hundred fifty-five patients had HeFREF with complete data on renal function, heart rate, and systolic blood pressure (SBP) prior to discharge. Eighty-three per cent of patients were taking an ACE-I or ARB, 85% a BB, and 63% an MRA at discharge. More than 60% of patients were eligible for sacubitril-valsartan and >70% for SGLT2I. Among those not already receiving a prescription, 37%, 28%, and 49% were eligible to start ACE-I or ARB, BB, and MRA, respectively. Low SBP (≤105 mmHg) was the most frequent explanation for failure to initiate or up-titrate therapy. CONCLUSIONS Most patients admitted for heart failure are eligible for initiation of life-prolonging medications prior to discharge. A hospital admission may be a common missed opportunity to improve treatment for patients with HeFREF.
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Abel AAI, Samuel NA, Cuthbert JJ, Brown OI, Pellicori P, Kazmi S, Cleland JGF, Johnson MJ, Clark AL. Hospital admissions in the last year of life of patients with heart failure. EUROPEAN HEART JOURNAL. QUALITY OF CARE & CLINICAL OUTCOMES 2024; 10:168-175. [PMID: 37553153 DOI: 10.1093/ehjqcco/qcad047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/05/2023] [Accepted: 08/07/2023] [Indexed: 08/10/2023]
Abstract
AIM To explore the frequency, causes, and pattern of hospitalisation for patients with chronic heart failure (HF) in the 12 months preceding death. We also investigated cause of death. METHODS Patients referred to a secondary care HF clinic were routinely consented for follow-up between 2001 and 2020 and classified into three phenotypes: (i) HF with reduced ejection fraction (HFrEF), (ii) HF with preserved ejection fraction (HFpEF) with plasma N-terminal pro B-type natriuretic peptide (NT-proBNP) 125-399 ng L-1, and (iii) HFpEF with NT-proBNP ≥400 ng L-1. Hospital admissions in the last year of life were classified as: HF, other cardiovascular (CV), or non-cardiovascular (non-CV). The cause of death was systematically adjudicated. RESULTS A total of 4925 patients (38% women; median age at death 81 [75-87] years) had 9127 hospitalisations in the last year of life. The median number of hospitalisations was 2 (1-3) and total days spent in hospital was 12 (2-25). Out of the total, 83% of patients had ≥1 hospitalisation but only 20% had ≥1 HF hospitalisation; 24% had ≥1 CV hospitalisation; 70% had ≥1 non-CV hospitalisation. Heart failure hospitalisations were most common in patients with HFrEF, but in all groups, at least two thirds of admissions were for non-CV causes. There were 788 (16%) deaths due to progressive HF, of which 74% occurred in hospital. CONCLUSION For patients with chronic HF in the last year of life, most hospitalisations were for non-CV causes regardless of HF phenotype. Most patients had no HF hospitalisations in their last year of life. Most deaths were from causes other than progressive HF.
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Brown OI, Drozd M, McGowan H, Giannoudi M, Conning-Rowland M, Gierula J, Straw S, Wheatcroft SB, Bridge K, Roberts LD, Levelt E, Ajjan R, Griffin KJ, Bailey MA, Kearney MT, Cubbon RM. Relationship Among Diabetes, Obesity, and Cardiovascular Disease Phenotypes: A UK Biobank Cohort Study. Diabetes Care 2023; 46:1531-1540. [PMID: 37368983 PMCID: PMC10369123 DOI: 10.2337/dc23-0294] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 05/25/2023] [Indexed: 06/29/2023]
Abstract
OBJECTIVE Obesity and diabetes frequently coexist, yet their individual contributions to cardiovascular risk remain debated. We explored cardiovascular disease biomarkers, events, and mortality in the UK Biobank stratified by BMI and diabetes. RESEARCH DESIGN AND METHODS A total of 451,355 participants were stratified by ethnicity-specific BMI categories (normal, overweight, obese) and diabetes status. We examined cardiovascular biomarkers including carotid intima-media thickness (CIMT), arterial stiffness, left ventricular ejection fraction (LVEF), and cardiac contractility index (CCI). Poisson regression models estimated adjusted incidence rate ratios (IRRs) for myocardial infarction, ischemic stroke, and cardiovascular death, with normal-weight nondiabetes as comparator. RESULTS Five percent of participants had diabetes (10% normal weight, 34% overweight, and 55% obese vs. 34%, 43%, and 23%, respectively, without diabetes). In the nondiabetes group, overweight/obesity was associated with higher CIMT, arterial stiffness, and CCI and lower LVEF (P < 0.005); these relationships were diminished in the diabetes group. Within BMI classes, diabetes was associated with adverse cardiovascular biomarker phenotype (P < 0.005), particularly in the normal-weight group. After 5,323,190 person-years follow-up, incident myocardial infarction, ischemic stroke, and cardiovascular mortality rose across increasing BMI categories without diabetes (P < 0.005); this was comparable in the diabetes groups (P-interaction > 0.05). Normal-weight diabetes had comparable adjusted cardiovascular mortality to obese nondiabetes (IRR 1.22 [95% CI 0.96-1.56]; P = 0.1). CONCLUSIONS Obesity and diabetes are additively associated with adverse cardiovascular biomarkers and mortality risk. While adiposity metrics are more strongly correlated with cardiovascular biomarkers than diabetes-oriented metrics, both correlate weakly, suggesting that other factors underpin the high cardiovascular risk of normal-weight diabetes.
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Brown OI, Sklirou M, Cuthbert JJ, Abel AA, Samuel NA, Kazmi S, Clark AL. The relation between change in left ventricular systolic function and subsequent mortality in patients with chronic heart failure. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.818] [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
Increasing severity of impairment of left ventricular systolic dysfunction (LVSD) in patients with chronic heart failure (CHF) is associated with higher mortality. However, the relation between temporal changes in LVSD severity and long-term clinical outcome is unknown.
Purpose
We therefore investigated the effects of change of LVSD as measured by serial echocardiography on all-cause mortality in patients with CHF.
Methods
Patients with CHF defined as the presence of compatible symptoms and either at least moderate LVSD or NTproBNP >125 ng/L were enrolled. LVSD was qualitatively assessed as: none, mild, moderate, and severe. Echocardiography was performed at baseline and 12 months. The primary endpoint was all-cause mortality. Cox proportional hazard models were used to assess the relation between changes in LVSD and outcome. Hazard ratios (HR) are reported with 95% confidence intervals (CI).
Results
At baseline, 170 (11%) had no, 231 (16%) mild, 633 (43%) moderate and 453 (30%) severe LVSD. Amongst patients with either moderate or severe LVSD at baseline, 40% had improvement in function at 12 months (figure 1). Amongst patients with no LVSD at baseline, only 14% had deterioration of function. During subsequent median follow up of 2773 days, 868 patients died. Worsening of LVSD was associated with increasing all-cause mortality in patients with moderate LVSD and severe LVSD at baseline, but this was not significant after adjustment for covariables (table 1). Improvement of LVSD was independently associated with better survival in patients with moderate LVSD at baseline (HR 0.72 (95% CI: 0.53–0.98, p=0.04).
Conclusion
Greater severity of LVSD at baseline is associated with increasing likelihood of improvement. Amongst patients with moderate LVSD, improvement in LVSD is independently associated with survival.
Funding Acknowledgement
Type of funding sources: Public Institution(s).
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Cuthbert JJ, Brown OI, Urbinati A, Pan D, Pellicori P, Dobbs K, Bulemfu J, Kazmi S, Sokoreli I, Pauws SC, Riistama JM, Cleland JGF, Clark AL. Hypochloraemia following admission to hospital with heart failure is common and associated with an increased risk of readmission or death: a report from OPERA-HF. EUROPEAN HEART JOURNAL. ACUTE CARDIOVASCULAR CARE 2022; 11:43-52. [PMID: 34897402 DOI: 10.1093/ehjacc/zuab097] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 09/19/2021] [Accepted: 10/11/2021] [Indexed: 06/14/2023]
Abstract
AIMS Hypochloraemia is common in patients hospitalized with heart failure (HF) and associated with a high risk of adverse outcomes during admission and following discharge. We assessed the significance of changes in serum chloride concentrations in relation to serum sodium and bicarbonate concentrations during admission in a cohort of 1002 consecutive patients admitted with HF and enrolled into an observational study based at a single tertiary centre in the UK. METHODS AND RESULTS Hypochloraemia (<96 mmol/L), hyponatraemia (<135 mmol/L), and metabolic alkalosis (bicarbonate >32 mmol/L) were defined by local laboratory reference ranges. Outcomes assessed were all-cause mortality, all-cause mortality or all-cause readmission, and all-cause mortality or HF readmission. Cox regression and Kaplan-Meier curves were used to investigate associations with outcome. During a median follow-up of 856 days (interquartile range 272-1416), discharge hypochloraemia, regardless of serum sodium, or bicarbonate levels was associated with greater all-cause mortality [hazard ratio (HR) 1.44, 95% confidence interval (CI) 1.15-1.79; P = 0.001], all-cause mortality or all-cause readmission (HR 1.26, 95% CI 1.04-1.53; P = 0.02), and all-cause mortality or HF readmission (HR 1.41, 95% CI 1.14-1.74; P = 0.002) after multivariable adjustment. Patients with concurrent hypochloraemia and natraemia had lower haemoglobin and haematocrit, suggesting congestion; those with hypochloraemia and normal sodium levels had more metabolic alkalosis, suggesting decongestion. CONCLUSION Hypochloraemia is common at discharge after a hospitalization for HF and is associated with worse outcome subsequently. It is an easily measured clinical variables that is associated with morbidity or mortality of any cause.
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Sykes DL, Crooks MG, Thu Thu K, Brown OI, Tyrer TJ, Rennardson J, Littlefield C, Faruqi S. Outcomes and characteristics of COVID-19 patients treated with continuous positive airway pressure/high-flow nasal oxygen outside the intensive care setting. ERJ Open Res 2021; 7:00318-2021. [PMID: 34611525 PMCID: PMC8287575 DOI: 10.1183/23120541.00318-2021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 07/05/2021] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Continuous positive airway pressure (CPAP) and high-flow nasal oxygen (HFNO) have been used to manage hypoxaemic respiratory failure secondary to coronavirus disease 2019 (COVID-19) pneumonia. Limited data are available for patients treated with noninvasive respiratory support outside of the intensive care setting. METHODS In this single-centre observational study we observed the characteristics, physiological observations, laboratory tests and outcomes of all consecutive patients with COVID-19 pneumonia between April 2020 and March 2021 treated with noninvasive respiratory support outside of the intensive care setting. RESULTS We report the outcomes of 140 patients (mean±sd age: 71.2±11.1, 65% male (n=91)) treated with CPAP/HFNO outside of the intensive care setting. Overall mortality was 59% and was higher in those deemed unsuitable for mechanical ventilation (72%). The mean age of survivors was significantly lower than those who died (66.1 versus 74.4 years, p<0.001). Those who survived their admission also had a significantly lower median Clinical Frailty Score than the non-survivor group (2 versus 4, p<0.001). We report no significant difference in mortality between those treated with CPAP (n=92, mortality: 60%) or HFNO (n=48, mortality: 56%). Treatment was well tolerated in 86% of patients receiving either CPAP or HFNO. CONCLUSIONS CPAP and HFNO delivered outside of the intensive care setting are viable treatment options for patients with hypoxaemic respiratory failure secondary to COVID-19 pneumonia, including those considered unsuitable for invasive mechanical ventilation. This provides an opportunity to safeguard intensive care capacity for COVID-19 patients requiring invasive mechanical ventilation.
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Sykes DL, Parthasarthy A, Brown OI, Crooks MG, Faruqi S. COVID-19 progression, frailty, and use of prolonged continuous positive airway pressure as a ward-based treatment: Lessons to be learnt from a case. Lung India 2021; 38:S64-S68. [PMID: 33686983 PMCID: PMC8104349 DOI: 10.4103/lungindia.lungindia_583_20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 07/18/2020] [Indexed: 12/24/2022] Open
Abstract
Coronavirus disease 19 (COVID-19) poses the greatest public health threat in 100 years, with cases rising rapidly in many countries around the world. We report a case of a 78-year-old female who exhibited a biphasic course of COVID-19; showing initial clinical improvement followed by deterioration before making a full recovery. The patient was managed with prolonged continuous positive airway pressure (CPAP) and supportive care. In total, 24 days of treatment with CPAP was administered. We emphasize the role of CPAP in the management of severely hypoxemic patients who are inappropriate for mechanical ventilation and describe the role of adequate nutrition and hydration for such patients.
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Samuel NA, Cuthbert JJ, Brown OI, Kazmi S, Cleland JG, Rigby AS, Clark AL. Relation Between Thyroid Function and Mortality in Patients With Chronic Heart Failure. Am J Cardiol 2021; 139:57-63. [PMID: 33115640 DOI: 10.1016/j.amjcard.2020.10.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 10/09/2020] [Accepted: 10/12/2020] [Indexed: 01/07/2023]
Abstract
Thyroid dysfunction is common in patients with chronic heart failure (CHF), but there is conflicting evidence regarding its prognostic significance. We investigated the relation between thyroid function and prognosis in a large, well characterized cohort of ambulatory patients with CHF. Heart failure was defined as signs and symptoms of the disease and either left ventricular systolic dysfunction (LVSD) mild or worse (heart failure with reduced ejection fraction [HFrEF]), or no LVSD and raised amino-terminal pro-B-type natriuretic peptide (NT-proBNP) levels (>125 ng/L; heart failure with normal ejection fraction [HFnEF]). Euthyroid state was defined as a thyroid-stimulating hormone (TSH) level between 0.35 and 4.70 mIU/l, hypothyroidism as TSH >4.70 mIU/l, and hyperthyroidism as TSH <0.35 mIU/l. 2997 patients had HFrEF and 1995 patients had HFnEF. 4491 (90%) patients were euthyroid, 312 (6%) were hypothyroid, and 189 (4%) were hyperthyroid. In univariable analysis, both hypothyroid patients (hazard ratio [HR] 1.25, 95% confidence interval [CI] 1.08 to 1.45) and hyperthyroid patients (HR 1.21, 95% CI 1.01 to 1.46) had a greater risk of death compared with euthyroid patients. There was a U-shaped relation between TSH and outcome. Increasing TSH was a predictor of mortality in univariable analysis (HR 1.02, 95% CI 1.01 to 1.03), but the association disappeared in multivariable analysis. The three strongest predictors of adverse outcome were increasing age, increasing NT-proBNP, and higher NYHA class. In conclusion, although thyroid dysfunction is associated with worse survival in patients with CHF, it is not an independent predictor of mortality.
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Howell SJ, Brown OI, Beattie WS. Aetiology of perioperative myocardial injury: a scientific conundrum with profound clinical implications. Br J Anaesth 2020; 125:642-646. [DOI: 10.1016/j.bja.2020.08.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 08/05/2020] [Accepted: 08/06/2020] [Indexed: 01/05/2023] Open
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Brown OI, Witte K, Shahi S, Clark AL. P2506Prognostic importance of ventilatory efficiency in healthy subjects. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0835] [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
Background
Low cardiorespiratory fitness, defined by reduced maximal oxygen consumption (VO2), is a predictor of mortality in patients without chronic disease. However, the relation between ventilatory efficiency (as measured by the slope of the relation between ventilation (VE) and carbon dioxide production (VCO2)) and all-cause mortality is unknown.
Purpose
To assess the relation between variables derived from cardiopulmonary exercise testing and long-term survival in normal subjects
Method
We recruited 145 healthy subjects, with no history of chronic disease (57% male, mean age 63±12) from primary care at random. All participants underwent cardiopulmonary exercise testing at baseline. Participants were followed for 15.5±3.5 years. The primary end-point was all-cause mortality. Cox-proportional hazard models were used to assess the relationship between measures of exercise performance and outcome. Hazard ratios (HR) are reported with 95% confidence intervals (CI).
Results
During follow up, 34 participants (23.4%) died. On univariable analysis, VE/VCO2 slope, peak VO2, respiratory exchange ratio at peak exercise, peak heart rate and 6-minute walk test distance were significant predictors of all-cause mortality (table 1). However, only VE/VCO2 slope (HR per unit increase: 1.13, 95% CI: 1.00–1.28, P=0.043) and peak heart rate (HR per 10 unit increase: 0.73, 95% CI: 0.57–0.93, P=0.010) were independent predictors of all-cause mortality on multivariable analysis.
Table 1. Cox regression analysis (univariable and multivariable) for cardiopulmonary exercise testing measures and all-cause mortality HR Presentation Univariable analysis Multivariable analysis HR 95% CI p value HR 95% CI p value Peak VO2 (ml/kg/min) Per unit increase 0.90 0.86–0.95 <0.001 0.94 0.86–1.03 0.214 VE/VCO2 slope Per unit increase 1.08 1.01–1.17 0.049 1.13 1.00–1.28 0.043 Exercise RER Per 0.1 unit increase 0.46 0.31–0.67 <0.001 0.72 0.45–1.17 0.185 Peak heart rate (bpm) Per 10 unit increase 0.73 0.65–0.81 <0.001 0.73 0.57–0.93 0.010 6MWT (metre) Per 25 unit increase 0.92 0.86–0.98 0.009 1.02 0.86–1.17 0.789 Peak systolic BP (mmHg) Per 10 unit increase 1.13 0.98–1.31 0.101 – – – Multivariable analysis is adjusted for age, body mass index, sex, smoking, resting systolic blood pressure and forced vital capacity. Abbreviations: 6MWT, 6-minute walk test; CI, confidence interval; HR, hazard ratio; RER, respiratory exchange ratio.
Conclusions
Raised VE/VCO2 slope is an independent predictor of all-cause mortality in healthy patients with no history of chronic disease.
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Brown OI, Costanzo P, Clark AL, Condorelli G, Cleland JGF, Sathyapalan T, Hepburn D, Kilpatrick ES, Atkin SL. P4475Glycated haemoglobin and risk of all-cause, causal mortality and cardiovascular hospitalisation in type 2 diabetes mellitus according to body mass index. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p4475] [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: 11/13/2022] Open
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Brown OI, Nikolaidou T, Beddoes G, Hoye A, Clark AL. The HF-CGM Study: An Analysis of Cardiogoniometric Axes in Patients With Cardiac Resynchronization Therapy. IEEE Trans Biomed Eng 2018; 65:1711-1716. [PMID: 29989935 DOI: 10.1109/tbme.2017.2769060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
GOAL The HF-CGM is a proof-of-principle study to investigate whether cardiogoniometry (CGM), a three-dimensional electrocardiographic method, can differentiate between pacing modes in patients with cardiac resynchronization therapy (CRT). METHODS At a tertiary cardiology center, CGM recordings were performed using four pacing modes: no pacing; right ventricular (RV) pacing; left ventricular (LV) pacing, and biventricular (BIV) pacing. Three orthogonal CGM planes orientated to the long axis (XY), the frontal plane (YZ), and the short axis (XZ) of the heart were constructed, and the direction of the QRS-axis was calculated for each pacing mode in each plane. During BIV pacing, the direction of CGM QRS-axis was compared between patients with optimal and nonoptimal 12-lead pacing variables. RESULTS Twenty-two participants (aged 71.5 ± 10.8; 77.3% male, LVEF 29 ± 7%) were consecutively recruited. Only QRS-axis measured in the XY plane could significantly distinguish between all three pacing modes versus no pacing. Mean QRS-axis in the XY plane with pacing off and during RV pacing was leftward and basal; LV pacing was apical; and BIV pacing was rightward and basal. There was a statistically significant difference in the direction of the QRS-axis between patients with optimal versus nonoptimal paced QRS morphology in the XY plane (rightward and basal versus inconsistent). SIGNIFICANCE CGM recorded in the XY plane can accurately detect differences between ventricular pacing sites. It may also be able to identify patients with a CRT device in situ who have optimal response.
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Brown OI, Clark AL, Chelliah R, Davison BJ, Mather AN, Cunnington MS, John J, Alahmar A, Oliver R, Aznaouridis K, Hoye A. Cardiogoniometry Compared to Fractional Flow Reserve at Identifying Physiologically Significant Coronary Stenosis: The CARDIOFLOW Study. Cardiovasc Eng Technol 2018; 9:439-446. [PMID: 29651685 PMCID: PMC6096643 DOI: 10.1007/s13239-018-0354-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 03/23/2018] [Indexed: 11/29/2022]
Abstract
Cardiogoniometry (CGM) is method of 3-dimensional electrocardiographic assessment which has been shown to identify patients with angiographically defined, stable coronary artery disease (CAD). However, angiographic evidence of CAD, does not always correlate to physiologically significant disease. The aim of our study was to assess the ability of CGM to detect physiologically significant coronary stenosis defined by fractional flow reserve (FFR). In a tertiary cardiology centre, elective patients with single vessel CAD were enrolled into a prospective double blinded observational study. A baseline CGM recording was performed at rest. A second CGM recording was performed during the FFR procedure, at the time of adenosine induced maximal hyperaemia. A significant CGM result was defined as an automatically calculated ischaemia score < 0 and a significant FFR ratio was defined as < 0.80. Measures of diagnostic performance (including sensitivity and specificity) were calculated for CGM at rest and during maximal hyperaemia. Forty-five patients were included (aged 61.1 ± 11.0; 60.0% male), of which eighteen (40%) were found to have significant CAD when assessed by FFR. At rest, CGM yielded a sensitivity of 33.3% and specificity of 63.0%. At maximal hyperaemia the sensitivity and specificity of CGM was 71.4 and 50.0% respectively. The diagnostic performance of CGM to detect physiologically significant stable CAD is poor at rest. Although, the diagnostic performance of CGM improves substantially during maximal hyperaemia, it does not reach sufficient levels of accuracy to be used routinely in clinical practice.
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Brown OI, Rossington JA, Hoye A. Potent P2Y12 Inhibitor Therapy for All? J Am Coll Cardiol 2017; 70:1425. [DOI: 10.1016/j.jacc.2017.05.079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 05/11/2017] [Indexed: 10/18/2022]
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I Brown O, Davison B, Rossington JA, Clark AL, Hoye A. 60 Cardiogoniometry vs the 12-lead electrocardiogram at identifying the culprit lesion in patients with with non-st segment elevation myocardial infarction: the cognition study. BRITISH HEART JOURNAL 2017. [DOI: 10.1136/heartjnl-2017-311726.59] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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I Brown O, Nikolaidou T, Beddoes G, Hoye A, Clark AL. 8 The hf-cgm study: an analysis of cardiogoniometric axes in patientswith cardiac resynchronisation therapy. BRITISH HEART JOURNAL 2017. [DOI: 10.1136/heartjnl-2017-311726.8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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I Brown O, Clark AL, Chelliah R, Davison B, Mather AN, Cunnington MS, John J, Alahmar A, Oliver R, Aznaouridis K, Hoye A. 103 The ability of cardiogoniogmetry compared to flow fractional reserve at identifying physiologically significant coronary stenosis: the cardioflow study. BRITISH HEART JOURNAL 2017. [DOI: 10.1136/heartjnl-2017-311726.102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Brown OI. eComment. Phosphocreatine in cardiovascular disease: how can we relate the evidence to clinical practice? Interact Cardiovasc Thorac Surg 2016; 23:646. [PMID: 27672178 DOI: 10.1093/icvts/ivw243] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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