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Memisoglu A, Hinton M, Elsayed Y, Graham R, Dakshinamurti S. Assessment of Autoregulation of the Cerebral Circulation during Acute Lung Injury in a Neonatal Porcine Model. CHILDREN (BASEL, SWITZERLAND) 2024; 11:611. [PMID: 38790606 PMCID: PMC11119854 DOI: 10.3390/children11050611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 04/30/2024] [Accepted: 05/15/2024] [Indexed: 05/26/2024]
Abstract
In neonates with acute lung injury (ALI), targeting lower oxygenation saturations is suggested to limit oxygen toxicity while maintaining vital organ function. Although thresholds for cerebral autoregulation are studied for the management of premature infants, the impact of hypoxia on hemodynamics, tissue oxygen consumption and extraction is not well understood in term infants with ALI. We examined hemodynamics, cerebral autoregulation and fractional oxygen extraction, as measured by near-infrared spectroscopy (NIRS) and blood gases, in a neonatal porcine oleic acid injury model of moderate ALI. We hypothesized that in ALI animals, cerebral oxygen extraction would be increased to a greater degree than kidney or gut oxygen extraction as indicative of the brain's adaptive efforts to increase cerebral oxygen extraction at the expense of splanchnic end organs. Fifteen anesthetized, ventilated 5-day-old neonatal piglets were divided into moderate lung injury by treatment with oleic acid or control (sham injection). The degree of lung injury was quantified at baseline and after establishment of ALI by blood gases, ventilation parameters and calculated oxygenation deficit, hemodynamic indices by echocardiography and lung injury score by ultrasound. PaCO2 was maintained constant during ventilation. Cerebral, renal and gut oxygenation was determined by NIRS during stepwise decreases in inspired oxygen from 50% to 21%, correlated with PaO2 and PvO2; changes in fractional oxygen extraction (ΔFOE) were calculated from NIRS and from regional blood gas samples. The proportion of cerebral autoregulation impairment attributable to blood pressure, and to hypoxemia, was calculated from autoregulation nomograms. ALI manifested as hypoxemia with increasing intrapulmonary shunt fraction, decreased lung compliance and increased resistance, and marked increase in lung ultrasound score. Brain, gut and renal NIRS, obtained from probes placed over the anterior skull, central abdomen and flank, respectively, correlated with concurrent SVC (brain) or IVC (gut, renal) PvO2 and SvO2. Cerebral autoregulation was impaired after ALI as a function of blood pressure at all FiO2 steps, but predominantly by hypoxemia at FiO2 < 40%. Cerebral ΔFOE was higher in ALI animals at all FiO2 steps. We conclude that in an animal model of neonatal ALI, cerebrovascular blood flow regulation is primarily dependent on oxygenation. There is not a defined oxygenation threshold below which cerebral autoregulation is impaired in ALI. Cerebral oxygen extraction is enhanced in ALI, reflecting compensation for exhausted cerebral autoregulation due to the degree of hypoxemia and/or hypotension, thereby protecting against tissue hypoxia.
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Affiliation(s)
- Asli Memisoglu
- Biology of Breathing Theme, Children’s Hospital Research Institute of Manitoba, Winnipeg, MB R3E 3P4, Canada; (A.M.); (M.H.)
| | - Martha Hinton
- Biology of Breathing Theme, Children’s Hospital Research Institute of Manitoba, Winnipeg, MB R3E 3P4, Canada; (A.M.); (M.H.)
- Department of Physiology, University of Manitoba, 745 Bannatyne Ave., Winnipeg, MB R3E 0J9, Canada
| | - Yasser Elsayed
- Section of Neonatology, Department of Pediatrics, Women’s Hospital, Health Sciences Centre, 665 William Ave., Winnipeg, MB R3E 0L8, Canada;
| | - Ruth Graham
- Departments of Anesthesiology, Perioperative and Pain Medicine, Health Sciences Centre, 671 William Ave., Winnipeg, MB R3E 0Z3, Canada;
| | - Shyamala Dakshinamurti
- Biology of Breathing Theme, Children’s Hospital Research Institute of Manitoba, Winnipeg, MB R3E 3P4, Canada; (A.M.); (M.H.)
- Department of Physiology, University of Manitoba, 745 Bannatyne Ave., Winnipeg, MB R3E 0J9, Canada
- Section of Neonatology, Department of Pediatrics, Women’s Hospital, Health Sciences Centre, 665 William Ave., Winnipeg, MB R3E 0L8, Canada;
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Soliman-Aboumarie H, Joshi SS, Cameli M, Michalski B, Manka R, Haugaa K, Demirkiran A, Podlesnikar T, Jurcut R, Muraru D, Badano LP, Dweck MR. EACVI survey on the multi-modality imaging assessment of the right heart. Eur Heart J Cardiovasc Imaging 2022; 23:1417-1422. [PMID: 36093580 DOI: 10.1093/ehjci/jeac183] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 08/19/2022] [Indexed: 11/12/2022] Open
Abstract
AIMS The European Association of Cardiovascular Imaging (EACVI) Scientific Initiatives Committee performed a global survey to evaluate the use of different cardiac imaging modalities for the evaluation of the right heart. METHODS AND RESULTS Delegates from 250 EACVI registered centres were invited to participate in a survey which was also advertised on the EACVI bulletin and on social media. One hundred and thirty-eight respondents from 46 countries across the world responded to the survey. Most respondents worked in tertiary centres (79%) and echocardiography was reported as the commonest imaging modality used to assess the right ventricle (RV). The majority of survey participants (78%) included RV size and function in >90% of their echocardiographic reports. The RV basal diameter obtained from the apical four-chamber view and the tricuspid annular plane systolic excursion were the commonest parameters used for the echocardiographic assessment of RV size and function as reported by 82 and 97% respondents, respectively. Survey participants reported arrhythmogenic cardiomyopathy as the commonest condition (88%) where cardiac magentic resonance (CMR) imaging was used for right heart assessment. Only 52% respondents included RV volumetric and ejection fraction assessments routinely in their CMR reports, while 30% of respondents included these parameters only when RV pathology was suspected. Finally, 73% of the respondents reported pulmonary hypertension as the commonest condition where right heart catheterization was performed. CONCLUSION Echocardiography remains the most frequently used imaging modality for the evaluation of the right heart, while the use of other imaging techniques, most notably CMR, is increasing.
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Affiliation(s)
- Hatem Soliman-Aboumarie
- Department of Anaesthetics and Critical Care, Harefield Hospital, Royal Brompton and Hospitals, Guy's and St Thomas NHS Foundation Trust, London, UK
- School of Cardiovascular Medicine and Sciences, King's College London, London, UK
| | - Shruti S Joshi
- BHF Centre for Cardiovascular Science, University of Edinburgh, 49 Little France Crescent, Edinburgh EH16 4SB, UK
| | - Matteo Cameli
- Division of Cardiology, University of Siena, Siena, Italy
| | - Blazej Michalski
- Department of Cardiology, Medical University of Lodz, Lodz, Poland
| | - Robert Manka
- Department of Cardiology, University Heart Center, University Hospital Zurich, University of Zurich, Zurich, Switzerland
- Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland
| | - Kristina Haugaa
- ProCardio Center for Innovation, Department of Cardiology, Oslo University Hospital, Rikshospitalet, Postboks 4950 Nydalen, 0424 Oslo, Norway
- Norway and Faculty of Medicine, Huddinge Karolinska Institute and Cardiovascular Division, Karolinska University Hospital, Stockholm, Sweden
| | - Ahmet Demirkiran
- Department of Cardiology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, The Netherlands
| | - Tomaz Podlesnikar
- Department of Cardiac Surgery, University Medical Centre Maribor, Maribor, Slovenia
- Department of Cardiology, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Ruxandra Jurcut
- Department of Cardiology, Emergency Institute for Cardiovascular Diseases, 'Carol Davila' University of Medicine and Pharmacy, Bucharest, Romania
| | - Denisa Muraru
- Department of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
- Department of Cardiology, Istituto Auxologico Italiano, IRCCS, Milan, Italy
| | - Luigi P Badano
- Department of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy
- Department of Cardiology, Istituto Auxologico Italiano, IRCCS, Milan, Italy
| | - Marc R Dweck
- BHF Centre for Cardiovascular Science, University of Edinburgh, 49 Little France Crescent, Edinburgh EH16 4SB, UK
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Ardahanli I, Akhan O, Sahin E, Akgun O, Gurbanov R. Myocardial performance index increases at long-term follow-up in patients with mild to moderate COVID-19. Echocardiography 2022; 39:620-625. [PMID: 35294060 PMCID: PMC9111876 DOI: 10.1111/echo.15340] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/02/2022] [Accepted: 03/04/2022] [Indexed: 11/26/2022] Open
Abstract
Background The long‐term cardiovascular effects of Coronavirus disease‐2019 (COVID‐19) are not yet well known. Myocardial performance index (MPI) is a non‐invasive, inexpensive and reproducible echocardiographic parameter that reflects systolic and diastolic cardiac functions. The aim of the study was to compare MPI with a healthy control group in patients with mild or moderate COVID‐19 infection who subsequently had unexplained cardiac symptoms. Methods The study included 200 patients aged 18–70 years who were diagnosed with COVID‐19 infection at least 2 months ago and defined cardiac symptoms in their follow‐up. Patients with mild or moderate symptoms, no history of hospitalization, and no other pathology that could explain cardiac symptoms were included in the study. As the control group, 182 healthy volunteers without COVID‐19 were evaluated. Echocardiographic examination was performed on the entire study group. Isovolumetric contraction time (IVCT), isovolumetric relaxation time (IVRT), and ejection time (ET) were measured by tissue Doppler imaging. MPI was calculated with the IVCT+IVRT/ET formula. Results The mean age of the study group was 44.24 ± 13.49 years. In the patient group the MPI was significantly higher (.50 ± .11 vs .46 ± .07, p < .001), IVRT was longer (69.67 ± 15.43 vs 65.94 ± 12.03 ms, p = . 008), and ET was shorter (271.09 ± 36.61 vs 271.09 ± 36.61 ms, p = .028). IVCT was similar between groups (63.87 ± 13.66 vs. 63.21 ± 10.77 ms, p = .66). Mitral E and mitral A wave, E’, A’, and E/A were similar in both groups. Conclusions Our study showed that conventional diastolic function parameters were not affected in patients who survived COVID‐19 with mild symptoms but had symptoms in the long term. However, MPI measurements showed left ventricular dysfunction. To our knowledge, this is the first echocardiographic follow‐up study to evaluate left ventricular systolic and diastolic functions with MPI in COVID‐19 patients. We think that when cardiac involvement assessment is required in patients who have survived COVID‐19, MPI should be measured alongside other echocardiographic measurements.
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Affiliation(s)
- Isa Ardahanli
- Department of Cardiology, Seyh Edebali University Faculty of Medicine, Bilecik, Turkey
| | - Onur Akhan
- Department of Cardiology, Bilecik Training and Research Hospital, Bilecik, Turkey
| | - Ebru Sahin
- Department of Cardiology, Bilecik Training and Research Hospital, Bilecik, Turkey
| | - Onur Akgun
- Department of Cardiology, Ankara Training and Research Hospital, Ankara, Turkey
| | - Rafig Gurbanov
- Department of Bioengineering, Bilecik Seyh Edebali University, Bilecik, Turkey
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Wernhart S, Hedderich J. Prediction of pulmonary hypertension in older adults based on vital capacity and systolic pulmonary artery pressure. JRSM Cardiovasc Dis 2020; 9:2048004020973834. [PMID: 33240494 PMCID: PMC7672752 DOI: 10.1177/2048004020973834] [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: 10/05/2020] [Accepted: 10/25/2020] [Indexed: 11/20/2022] Open
Abstract
Objective Right heart catheterization (RHC) is associated with a higher procedural risk in older adults, but non-invasive estimation of pulmonary hypertension (PH) is a challenge. We aimed to elaborate a non-invasive prediction model to estimate PH. Methods and design We retrospectively analysed 134 older adults (70.0 years ±12.3; 44.9% males) who reported to our clinic with unclear dyspnea between 01/2015 and 01/2020 and had received RHC as a part of their diagnostic workup. Lung function testing, analysis of blood gas samples, 6 min walk distance and echocardiography were performed within 24 hours of RHC. Main outcome measures In a stepwise statistical approach by using an in/exclusion algorithm (using the AIC criterion) we analysed non-invasive parameters to test their value in predicting PH (defined as mean pulmonary artery pressure, PAmean, >25mmHg). Discrimination capability of the final model was measured by the AUC (area under curve) from an ROC (receiver operating characteristics) analysis. Results We yielded a sensitivity of 87.2% and a specificity of 62.5% in a combinatorial logistical model with systolic pulmonary artery pressure (sPAP) and forced vital capacity (VCmax), the discrimination index was 86.7%. The odds ratios for an increase of 10 mmHg of sPAP were 2.99 (2.08–4.65) and 1.86 (1.11–3.21) for a 1 l decrease in VCmax. On their own, VCmax proved to be specific (83.3%), while sPAP was a sensitive (79.1%) predictor for PH. Conclusions We provide a combinatorial model to predict PH from sPAP and VCmax in older adults, which may help to avoid invasive procedures.
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Affiliation(s)
- Simon Wernhart
- Department of Cardiology, Fachkrankenhaus Kloster Grafschaft, Schmallenberg, Germany.,West German Heart- and Vascular Center, Department of Cardiology and Vascular Medicine, University Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - Jürgen Hedderich
- Medistat-Biomedical Statistics, Medistat GmbH, Kronshagen, Germany
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