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Shen T, Li Y, Liu T, Lian Y, Kong L. Association between Mycoplasma pneumoniae infection, high‑density lipoprotein metabolism and cardiovascular health (Review). Biomed Rep 2024; 20:39. [PMID: 38357242 PMCID: PMC10865299 DOI: 10.3892/br.2024.1729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 01/09/2024] [Indexed: 02/16/2024] Open
Abstract
The association between Mycoplasma pneumoniae (M. pneumoniae) infection, high-density lipoprotein metabolism and cardiovascular disease is an emerging research area. The present review summarizes the basic characteristics of M. pneumoniae infection and its association with high-density lipoprotein and cardiovascular health. M. pneumoniae primarily invades the respiratory tract and damages the cardiovascular system through various mechanisms including adhesion, invasion, secretion of metabolites, production of autoantibodies and stimulation of cytokine production. Additionally, the present review highlights the potential role of high-density lipoprotein for the development of prevention and intervention of M. pneumoniae infection and cardiovascular disease, and provides suggestions for future research directions and clinical practice. It is urgent to explore the specific mechanisms underlying the association between M. pneumoniae infection, high-density lipoprotein metabolism, and cardiovascular disease and analyze the roles of the immune system and inflammatory response.
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Affiliation(s)
- Tao Shen
- Department of Clinical Laboratory, Jincheng People's Hospital, Jincheng, Shanxi 048000, P.R. China
- Jincheng Hospital Affiliated to Changzhi Medical College, Jincheng, Shanxi 048000, P.R. China
| | - Yanfang Li
- Department of Clinical Laboratory, Jincheng People's Hospital, Jincheng, Shanxi 048000, P.R. China
- Jincheng Hospital Affiliated to Changzhi Medical College, Jincheng, Shanxi 048000, P.R. China
| | - Tingting Liu
- Department of Clinical Laboratory, Jincheng People's Hospital, Jincheng, Shanxi 048000, P.R. China
- Jincheng Hospital Affiliated to Changzhi Medical College, Jincheng, Shanxi 048000, P.R. China
| | - Yunzhi Lian
- Department of Clinical Laboratory, Jincheng People's Hospital, Jincheng, Shanxi 048000, P.R. China
- Jincheng Hospital Affiliated to Changzhi Medical College, Jincheng, Shanxi 048000, P.R. China
| | - Luke Kong
- Department of Clinical Laboratory, Jincheng People's Hospital, Jincheng, Shanxi 048000, P.R. China
- Jincheng Hospital Affiliated to Changzhi Medical College, Jincheng, Shanxi 048000, P.R. China
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Wang JEH, Tsai SJ, Wang YP, Chen TJ, Wang TJ, Chen MH. Bacterial Pneumonia and Stroke Risk: A Nationwide Longitudinal Followup Study. Curr Neurovasc Res 2024; 20:578-585. [PMID: 38288840 DOI: 10.2174/0115672026280736240108093755] [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: 09/05/2023] [Revised: 10/09/2023] [Accepted: 10/12/2023] [Indexed: 07/16/2024]
Abstract
BACKGROUND Pneumonia causes significant morbidity and mortality and has been associated with cardiovascular complications. Our study aimed to investigate the incidence of ischemic and hemorrhagic strokes following bacterial pneumonia. METHODS Between 1997 and 2012, 10,931 subjects with bacterial pneumonia and 109,310 controls were enrolled from the Taiwan National Health Insurance Research Database, and were followed up to the end of 2013. The risk of stroke was estimated in Cox regression analyses with hazard ratios (HRs) and 95% confidence intervals (CIs). RESULTS When compared to the control group, subjects in the bacterial pneumonia group had a higher incidence of developing ischemic stroke (2.7% versus 0.4%, p <0.001) and hemorrhagic stroke (0.7% versus 0.1%, p <0.001). The risk of stroke increases with repeated hospitalizations due to bacterial pneumonia. Across bacterial etiologies, bacterial pneumonia was a significant risk factor among 775 subjects who developed ischemic stroke (HR, 5.72; 95% CI, 4.92-6.65) and 193 subjects who developed hemorrhagic stroke (HR, 5.33; 95% CI, 3.91-7.26). CONCLUSION The risks of developing ischemic stroke and hemorrhagic stroke are significant following bacterial pneumonia infection. The risk factors, clinical outcomes, and the disease course should also be profiled to better inform the monitoring of stroke development and the clinical management of bacterial pneumonia patients.
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Grants
- V111C-010, V111C-040, V111C-029, V112C-033, V113C-010, V113C-011, V113C-039 Taipei Veterans General Hospital
- CI-109-21, CI-109-22, CI-110-30, CI-113-30, CI-113-31, CI-113-32 Yen Tjing Ling Medical Foundation
- MOST110-2314-B-075-026, MOST110-2314-B-075-024 -MY3, MOST 109-2314-B-010-050-MY3, MOST111-2314-B-075 -014 -MY2, MOST 111-2314-B-075 -013, NSTC111-2314-B-A49-089-MY2 Ministry of Science and Technology, Taiwan
- VTA112-V1-6-1, VTA113-V1-5-1 Taipei, Taichung, Kaohsiung Veterans General Hospital, Tri-Service General Hospital, Academia Sinica Joint Research Program
- VGHUST112-G1-8-1, VGHUST113-G1-8-1 Veterans General Hospitals and University System of Taiwan Joint Research Program
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Affiliation(s)
- Joyce En-Hua Wang
- Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
- Georgetown University School of Medicine, Washington, DC, USA
| | - Shih-Jen Tsai
- Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
- Department of Psychiatry, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Institute of Brain Science, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Yen-Po Wang
- Institute of Brain Science, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Endoscopy Center for Diagnosis of Treatment, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Tzeng-Ji Chen
- Department of Family Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Hospital and Health Care Administration, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Tso-Jen Wang
- Taoyuan Psychiatric Center, Ministry of Health and Welfare, Taoyuan, 33058, Taiwan
| | - Mu-Hong Chen
- Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
- Department of Psychiatry, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Institute of Brain Science, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
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Younis H, Loh CC, Singh C, Pichuthirumalai S, Kaur G, Bajwa AS, Aziz SN, Vasavada A, Patel V. Acute Myocardial Infarction-Related Hospitalizations in Non-elderly Patients with Pneumonia: a Population-Based Study. SN COMPREHENSIVE CLINICAL MEDICINE 2023; 5:160. [PMID: 37303486 PMCID: PMC10245359 DOI: 10.1007/s42399-023-01499-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/30/2023] [Indexed: 06/13/2023]
Abstract
The objective is to study factors that increase the likelihood of acute myocardial infarction (AMI) in hospitalized adult non-elderly patients with pneumonia compared to other medical inpatients and to understand the utilization rate of percutaneous coronary intervention (PCI) for AMI in inpatients with pneumonia and its related impact on hospitalization stay and cost. A population-based study was conducted using the Nationwide Inpatient Sample (NIS, 2019) with adult non-elderly inpatients (age 18-65 years) with a medical condition as their primary diagnosis and a co-diagnosis of pneumonia during hospitalization stay. This study sample was divided by the primary diagnosis of AMI versus other medical conditions (non-AMI). A logistic regression model was used to evaluate the odds ratio (OR) of predictors associated with AMI in patients with pneumonia. The results showed a direct relationship between increasing age and the likelihood of AMI in pneumonia inpatients with three times higher odds seen in 51-65 years of age (OR 2.95, 95% CI 2.82-3.09). The comorbidities included complicated hypertension (OR 2.84, 95% CI 2.78-2.89), diabetes with complications (OR 1.27, 95% CI 1.24-1.29), and drug abuse (OR 1.27, 95% CI 1.22-1.31) that increased the likelihood of AMI-related hospitalization. The utilization rate of surgical treatment (PCI) was 14.37% for the management of AMI in inpatients with pneumonia. Inpatients co-diagnosed with pneumonia and comorbidities such as hypertension and diabetes were more likely to be hospitalized for AMI. These at-risk patients should be considered for early risk stratification. Utilization of PCI was associated with a lower in-hospital mortality rate.
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Affiliation(s)
- Hadia Younis
- Department of Medicine, Peshawar Medical College, Peshawar, Pakistan
| | - Chia Chi Loh
- Department of Internal Medicine, Manipal University College Malaysia, Melaka, Malaysia
| | - Charanjot Singh
- Department of Medicine, Sri Guru Ram Das Institute of Medical Sciences and Research, Amritsar, India
| | | | - Gagan Kaur
- Department of Medicine, Sri Guru Ram Das Institute of Medical Sciences and Research, Amritsar, India
| | - Avreet S. Bajwa
- Department of Medicine, Sri Guru Ram Das Institute of Medical Sciences and Research, Amritsar, India
| | - Syed Nurul Aziz
- Department of Medicine, Shaheed Suhrawardy Medical College, Dhaka, Bangladesh
| | - Advait Vasavada
- Department of Medicine, M P Shah Medical College, 2, Green Park Apartment, Park Colony, Jamnagar, India
| | - Viralkumar Patel
- Department of Internal Medicine, Sarasota Memorial Health Care System, Sarasota, USA
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Søgaard M, Skjøth F, Nielsen PB, Smit J, Dalager-Pedersen M, Larsen TB, Lip GYH. Thromboembolic Risk in Patients With Pneumonia and New-Onset Atrial Fibrillation Not Receiving Anticoagulation Therapy. JAMA Netw Open 2022; 5:e2213945. [PMID: 35616941 PMCID: PMC9136621 DOI: 10.1001/jamanetworkopen.2022.13945] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
IMPORTANCE New-onset atrial fibrillation (AF) is commonly reported in patients with severe infections. However, the absolute risk of thromboembolic events without anticoagulation remains unknown. OBJECTIVE To investigate the thromboembolic risks associated with AF in patients with pneumonia, assess the risk of recurrent AF, and examine the association of initiation of anticoagulation therapy with new-onset AF. DESIGN, SETTING, AND PARTICIPANTS This population-based cohort study used linked Danish nationwide registries. Participants included patients hospitalized with incident community-acquired pneumonia in Denmark from 1998 to 2018. Statistical analysis was performed from August 15, 2021, to March 12, 2022. EXPOSURES New-onset AF. MAIN OUTCOMES AND MEASURES Thromboembolic events, recurrent AF, and all-cause death. Estimated risks were calculated for thromboembolism without anticoagulation therapy, new hospital or outpatient clinic contact with AF, initiation of anticoagulation therapy, and all-cause death at 1 and 3 years of follow-up. Death was treated as a competing risk, and inverse probability of censoring weights was used to account for patient censoring if they initiated anticoagulation therapy conditioned on AF. RESULTS Among 274 196 patients hospitalized for community-acquired pneumonia, 6553 patients (mean age [SD], 79.1 [11.0] years; 3405 women [52.0%]) developed new-onset AF. The 1-year risk of thromboembolism was 0.8% (95% CI, 0.8%-0.8%) in patients without AF vs 2.1% (95% CI, 1.8%-2.5%) in patients with new-onset AF without anticoagulation; this risk was 1.4% (95% CI, 1.0%-2.0%) among patients with AF with intermediate stroke risk and 2.8% (95% CI, 2.3%-3.4%) in patients with AF with high stroke risk. Three-year risks were 3.5% (95% CI, 2.8%-4.3%) among patients with intermediate stroke risk and 5.3% (95% CI, 4.4%-6.5%) among patients with high stroke risk. Among patients with new-onset AF, 32.9% (95% CI, 31.8%-34.1%) had a new hospital contact with AF, and 14.0% (95% CI, 13.2%-14.9%) initiated anticoagulation therapy during the 3 years after incident AF diagnosis. At 3 years, the all-cause mortality rate was 25.7% (95% CI, 25.6%-25.9%) in patients with pneumonia without AF vs 49.8% (95% CI, 48.6%-51.1%) in patients with new-onset AF. CONCLUSIONS AND RELEVANCE This cohort study found that new-onset AF after community-acquired pneumonia was associated with an increased risk of thromboembolism, which may warrant anticoagulation therapy. Approximately one-third of patients had a new hospital or outpatient clinic contact for AF during the 3-year follow-up, suggesting that AF triggered by acute infections is not a transient, self-terminating condition that reverses with resolution of the infection.
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Affiliation(s)
- Mette Søgaard
- Department of Cardiology, Aalborg University Hospital, Aalborg, Denmark
- Aalborg Thrombosis Research Unit, Department of Clinical Medicine, Faculty of Health, Aalborg University, Aalborg, Denmark
| | - Flemming Skjøth
- Aalborg Thrombosis Research Unit, Department of Clinical Medicine, Faculty of Health, Aalborg University, Aalborg, Denmark
- Unit for Clinical Biostatistics, Aalborg University Hospital, Aalborg, Denmark
| | - Peter B. Nielsen
- Department of Cardiology, Aalborg University Hospital, Aalborg, Denmark
- Aalborg Thrombosis Research Unit, Department of Clinical Medicine, Faculty of Health, Aalborg University, Aalborg, Denmark
| | - Jesper Smit
- Department of Infectious Diseases, Aalborg University Hospital, Aalborg, Denmark
| | | | - Torben B. Larsen
- Department of Cardiology, Aalborg University Hospital, Aalborg, Denmark
- Aalborg Thrombosis Research Unit, Department of Clinical Medicine, Faculty of Health, Aalborg University, Aalborg, Denmark
| | - Gregory Y. H. Lip
- Aalborg Thrombosis Research Unit, Department of Clinical Medicine, Faculty of Health, Aalborg University, Aalborg, Denmark
- Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart & Chest Hospital, Liverpool, United Kingdom
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Zhao X, Liu Y, Zhang J, Fu S, Song C, Bai Y, Luo L. Acute Lower Respiratory Tract Infection Increased the Risk of Cardiovascular Events and All-Cause Mortality in Elderly Patients With Stable Coronary Artery Disease. Front Cardiovasc Med 2021; 8:711264. [PMID: 34604352 PMCID: PMC8484318 DOI: 10.3389/fcvm.2021.711264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 08/16/2021] [Indexed: 11/13/2022] Open
Abstract
Objective: To investigate the predictors of acute cardiovascular events within 90 days after an acute lower respiratory tract infection (ALRTI) in elderly patients with stable coronary artery disease (sCAD). Methods: Observational analyses were conducted in a prospective cohort of the elderly with sCAD, during 90 days after they were hospitalized for ALRTI. Multiple logistic regression analysis was performed to identify predictors for acute cardiovascular events and all-cause mortality. Results: The present study comprised 426 patients with sCAD (median age: 88 years; IQR: 84-91; range: 72-102). Among these patients, 257 suffering from ALRTI were enrolled in the infection group. Meanwhile, 169 patients who did not suffer from ALRTI were regarded as the non-infection group. Compared with the non-infection group, patients in the infection group had a higher incidence of acute cardiovascular events (31.9 vs. 13.6%, p < 0.001) and all-cause mortality (13.2 vs. 1.8%, p < 0.001) during the 90-day follow-up. In addition, in the infection group, the incidence of cardiovascular events was also higher than those in the non-infection group during the 7-day and 30-day follow-up (10.9 vs. 2.4%, p = 0.001; 20.6 vs. 6.5%, p < 0.001). The same difference in the incidence of all-cause mortality during 7 and 30 days (1.2 vs. 0%, p = 0.028; 3.9 vs. 0.6%, p = 0.021) was observed between the two groups. Furthermore, multiple regression analysis found that ALRTI was independently associated with increased risk of cardiovascular events and all-cause mortality in elderly patients with sCAD. Conclusion: In elderly patients with sCAD, ALRTI was an independent predictor for both cardiovascular events and all-cause mortality.
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Affiliation(s)
- Xiaoqian Zhao
- Department of Cardiology, The Second Medical Center, National Clinical Research Center for Geriatric Diseases, Beijing Key Laboratory of Chronic Heart Failure Precision Medicine, Chinese PLA General Hospital, Beijing, China.,Department of Cardiology, Chinese PLA 305 Hospital, Beijing, China
| | - Yuan Liu
- Department of Emergency, The Second Medical Center, National Clinical Research Center for Geriatric Diseases, Beijing Key Laboratory of Chronic Heart Failure Precision Medicine, Chinese PLA General Hospital, Beijing, China
| | - Jinping Zhang
- Department of Cardiology, Chinese PLA 305 Hospital, Beijing, China
| | - Shihui Fu
- Department of Cardiology, Hainan Hospital of Chinese PLA General Hospital, Beijing, China
| | - Chengyun Song
- Department of Cardiology, Chinese PLA 305 Hospital, Beijing, China
| | - Yongyi Bai
- Department of Cardiology, The Second Medical Center, National Clinical Research Center for Geriatric Diseases, Beijing Key Laboratory of Chronic Heart Failure Precision Medicine, Chinese PLA General Hospital, Beijing, China
| | - Leiming Luo
- Department of Cardiology, The Second Medical Center, National Clinical Research Center for Geriatric Diseases, Beijing Key Laboratory of Chronic Heart Failure Precision Medicine, Chinese PLA General Hospital, Beijing, China
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Rombauts A, Abelenda-Alonso G, Cuervo G, Gudiol C, Carratalà J. Role of the inflammatory response in community-acquired pneumonia: clinical implications. Expert Rev Anti Infect Ther 2021; 20:1261-1274. [PMID: 33034228 DOI: 10.1080/14787210.2021.1834848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
INTRODUCTION Despite adequate antibiotic coverage, community-acquired pneumonia (CAP) remains a leading cause of hospitalization and mortality worldwide. It induces both a local pulmonary and a systemic inflammatory response, particularly significant in severe cases. The intensity of the dysregulated host response varies from patient to patient and has a negative impact on survival and other outcomes. AREAS COVERED This comprehensive review summarizes the pathophysiological aspects of the inflammatory response in CAP, briefly discusses the usefulness of biomarkers, and assesses the clinical evidence for modulating the inflammatory pathways. We searched PubMed for the most relevant studies, reviews, and meta-analysis until August 2020. EXPERT OPINION Notable efforts have been made to identify biomarkers that can accurately differentiate between viral and bacterial etiology, and indeed, to enhance risk stratification in CAP. However, none has proven ideal and no recommended biomarker-guided algorithms exist. Biomarker signatures from proteomic and metabolomic studies could be more useful for such assessments. To date, most studies have produced contradictory results concerning the role of immunomodulatory agents (e.g. corticosteroids, macrolides, and statins) in CAP. Adequately identifying the population who may benefit most from effective modulation of the inflammatory response remains a challenge.
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Affiliation(s)
- Alexander Rombauts
- Department of Infectious Diseases, Hospital Universitari de Bellvitge, Hospitalet de Llobregat, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain
| | - Gabriela Abelenda-Alonso
- Department of Infectious Diseases, Hospital Universitari de Bellvitge, Hospitalet de Llobregat, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain
| | - Guillermo Cuervo
- Department of Infectious Diseases, Hospital Universitari de Bellvitge, Hospitalet de Llobregat, Barcelona, Spain
| | - Carlota Gudiol
- Department of Infectious Diseases, Hospital Universitari de Bellvitge, Hospitalet de Llobregat, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain.,Spanish Network for Research in Infectious Disease (REIPI), Instituto de Salud Carlos III, Madrid, Spain.,University of Barcelona, Barcelona, Spain.,Institut Català d'Oncologia (ICO), Hospitalet de Llobregat, Barcelona, Spain
| | - Jordi Carratalà
- Department of Infectious Diseases, Hospital Universitari de Bellvitge, Hospitalet de Llobregat, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Spain.,Spanish Network for Research in Infectious Disease (REIPI), Instituto de Salud Carlos III, Madrid, Spain.,University of Barcelona, Barcelona, Spain
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New-onset atrial fibrillation in patients with pneumococcal pneumonia. Impact of timing and duration on short- and medium-term mortality. J Infect 2020; 82:67-75. [PMID: 33189773 DOI: 10.1016/j.jinf.2020.11.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 11/04/2020] [Accepted: 11/08/2020] [Indexed: 11/20/2022]
Abstract
OBJETIVES To assess the incidence, related factors, timing and duration of new- onset atrial fibrillation in a cohort of consecutive patients diagnosed with pneumococcal pneumonia. METHODS Observational study including all immunocompetent adults hospitalized for pneumococcal pneumonia. Patients were classified by time (atrial fibrillation recognized on emergency room arrival or developed during hospitalization) and duration (paroxysmal or persistent). Patients were followed-up for 6 months after discharge. RESULTS We included 1092 patients, of whom 109 (9.9%) had new-onset atrial fibrillation. An early event was documented in 87 (79.8%) cases. Arrhythmia was classified as paroxysmal in 78 patients. Older age, heavy drinking, respiratory rate ≥ 30/minute, leukopenia, severe inflammation and bacteremia were independent risk factors for developing new-onset atrial fibrillation on admission. Overall, 48 (4.4%) patients died during hospitalization, the rate being higher in those patients who developed new-onset arrhythmia (17.9% vs 2.9% p<0.001). Among patients with events recognized at admission, in-hospital mortality was higher in those with persistent arrhythmia (34.8% vs 6.3%, p = 0.002) and 6-month survival was better among those who developed paroxysmal event. CONCLUSIONS The development of new-onset atrial fibrillation was associated with pneumonia severity, and higher in-hospital mortality. Bacteremia and severe systemic inflammation were factors associated with its development.
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Rombauts A, Abelenda-Alonso G, Càmara J, Lorenzo-Esteller L, González-Díaz A, Sastre-Escolà E, Gudiol C, Dorca J, Tebé C, Pallarès N, Ardanuy C, Carratalà J. Host- and Pathogen-Related Factors for Acute Cardiac Events in Pneumococcal Pneumonia. Open Forum Infect Dis 2020; 7:ofaa522. [PMID: 33335932 PMCID: PMC7727332 DOI: 10.1093/ofid/ofaa522] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 10/21/2020] [Indexed: 12/12/2022] Open
Abstract
Background Acute cardiac events (ACEs) are increasingly being recognized as a major complication in pneumococcal community-acquired pneumonia (CAP). Information regarding host- and pathogen-related factors for ACEs, including pneumococcal serotypes and clonal complexes, is scarce. Methods A retrospective study was conducted of a prospective cohort of patients hospitalized for CAP between 1996 and 2019. Logistic regression and funnel plot analyses were performed to determine host- and pathogen-related factors for ACEs. Results Of 1739 episodes of pneumococcal CAP, 1 or more ACEs occurred in 304 (17.5%) patients, the most frequent being arrhythmia (n = 207), heart failure (n = 135), and myocardial infarction (n = 23). The majority of ACEs (73.4%) occurred within 48 hours of admission. Factors independently associated with ACEs were older age, preexisting heart conditions, pneumococcal bacteremia, septic shock at admission, and high-risk pneumonia. Among 983 pneumococcal isolates, 872 (88.7%) were serotyped and 742 (75.5%) genotyped. The funnel plot analyses did not find any statistically significant association between serotypes or clonal complexes with ACEs. Nevertheless, there was a trend toward an association between CC230 and these complications. ACEs were independently associated with 30-day mortality (adjusted odds ratio, 1.88; 95% CI, 1.11-3.13). Conclusions ACEs are frequent in pneumococcal pneumonia and are associated with increased mortality. The risk factors defined in this study may help identify patients who must undergo close follow-up, including heart rhythm monitoring, and special care to avoid fluid overload, particularly during the first 48 hours of admission. These high-risk patients should be the target for preventive intervention strategies.
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Affiliation(s)
- Alexander Rombauts
- Department of Infectious Diseases, Bellvitge University Hospital, Hospitalet de Llobregat, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain
| | - Gabriela Abelenda-Alonso
- Department of Infectious Diseases, Bellvitge University Hospital, Hospitalet de Llobregat, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain
| | - Jordi Càmara
- Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain.,Department of Microbiology, Bellvitge Universtiy Hospital, Hospitalet de Llobregat, Barcelona, Spain.,Research Network for Respiratory Diseases (CIBERES), Instituto de Salud Carlos III, Madrid, Spain
| | - Laia Lorenzo-Esteller
- Department of Infectious Diseases, Bellvitge University Hospital, Hospitalet de Llobregat, Barcelona, Spain
| | - Aida González-Díaz
- Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain.,Department of Microbiology, Bellvitge Universtiy Hospital, Hospitalet de Llobregat, Barcelona, Spain.,Research Network for Respiratory Diseases (CIBERES), Instituto de Salud Carlos III, Madrid, Spain
| | - Enric Sastre-Escolà
- Department of Infectious Diseases, Bellvitge University Hospital, Hospitalet de Llobregat, Barcelona, Spain
| | - Carlota Gudiol
- Department of Infectious Diseases, Bellvitge University Hospital, Hospitalet de Llobregat, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain.,Spanish Network for Research in Infectious Diseases (REIPI), Instituto de Salud Carlos III, Madrid, Spain.,University of Barcelona, Barcelona, Spain
| | - Jordi Dorca
- Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain.,University of Barcelona, Barcelona, Spain.,Department of Pneumology, Bellvitge University Hospital, Hospitalet de Llobregat, Barcelona, Spain
| | - Cristian Tebé
- Biostatistics Unit at Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain
| | - Natàlia Pallarès
- Biostatistics Unit at Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain
| | - Carmen Ardanuy
- Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain.,Department of Microbiology, Bellvitge Universtiy Hospital, Hospitalet de Llobregat, Barcelona, Spain.,Research Network for Respiratory Diseases (CIBERES), Instituto de Salud Carlos III, Madrid, Spain.,University of Barcelona, Barcelona, Spain
| | - Jordi Carratalà
- Department of Infectious Diseases, Bellvitge University Hospital, Hospitalet de Llobregat, Barcelona, Spain.,Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain.,Spanish Network for Research in Infectious Diseases (REIPI), Instituto de Salud Carlos III, Madrid, Spain.,University of Barcelona, Barcelona, Spain
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Sun JR, Wang HH, Zong LZ, Yuan WW, Bai ZY. Ventilator for the management of patients with severe pneumonia: A protocol of systematic review. Medicine (Baltimore) 2020; 99:e22386. [PMID: 33031274 PMCID: PMC7544297 DOI: 10.1097/md.0000000000022386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND This study will assess the efficacy and safety of ventilator for the management of severe pneumonia (SP). METHODS This study will search the following electronic databases in MEDLINE, EMBASE, Web of Science, PsycINFO, Cochrane Library, CNKI, and Scopus from the beginning to present without language restrictions. Two authors will screen all records according to the eligibility criteria; assess study quality; and extract all essential data from eligible studies. If sufficient studies are included, we will pool the extracted data and carry out meta-analysis. RESULTS This study will summarize published studies to assess the efficacy and safety of ventilator for patients with SP. CONCLUSION The results of this study may supply a genuine understanding of perspective from a scientific basis on ventilator for the management of patients with SP.
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Affiliation(s)
- Jian-Rong Sun
- Department of Geriatric Respiratory Medicine, Cardiovascular and Cerebrovascular Hospital of Yan’an University Affiliated Hospital
| | - Huan-Huan Wang
- Department of Critical Neurology, Yan’an University Affiliated Hospital
| | - Long-Ze Zong
- Department of Joint Surgery, Yan’an University Affiliated Hospital
| | - Wei-Wei Yuan
- Department of Surgical Intensive Care Center, Yan’an University Affiliated Hospital, Yan’an, Shaanxi, China
| | - Zhi-Yuan Bai
- Department of Geriatric Respiratory Medicine, Cardiovascular and Cerebrovascular Hospital of Yan’an University Affiliated Hospital
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Feldman C. Cardiac complications in community-acquired pneumonia and COVID-19. Afr J Thorac Crit Care Med 2020; 26:10.7196/AJTCCM.2020.v26i2.077. [PMID: 34235421 PMCID: PMC7221539 DOI: 10.7196/ajtccm.2020.v26i2.077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/04/2020] [Indexed: 12/11/2022] Open
Abstract
Community-acquired pneumonia (CAP) remains a global health problem with significant morbidity and mortality. Much recent published literature about the infection has indicated that a substantial number of patients with CAP, particularly those ill enough to be admitted to hospital, will suffer a cardiovascular event. While these may include events such as deep venous thrombosis and stroke, most of the events involve the heart and include the occurrence of an arrhythmia (most commonly atrial fibrillation), new onset or worsening of heart failure and acute myocardial infarction. While such cardiac events may occur, for example, in all-cause CAP and CAP due to influenza virus infection, and more recently described with the SARS-CoV-2 pandemic, a significant amount of research work has been investigating the pathogenic mechanisms of these cardiac events in patients with CAP due to Streptococcus pneumoniae (pneumococcus) and, more recently, COVID-19 infections. Such research has identified a number of mechanisms by which these microorganisms may cause cardiovascular events. Importantly, these cardiac events appear not only to be associated with in-hospital mortality, but they also appear to contribute to longer-term mortality of patients with CAP, even after their discharge from hospital. This review will focus initially on studies of cardiovascular events in all-cause CAP and pneumococcal CAP, excluding COVID-19 infection, and then address similar issues in the latter infection.
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Affiliation(s)
- C Feldman
- Department of Internal Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
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11
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Abstract
PURPOSE OF REVIEW Pneumonia, an inflammatory disease, is the single largest infectious cause of death. Pneumonia has recently been established as an important contributing factor to major adverse cardiovascular events including heart failure. Developing an intermechanistic understanding of pneumonia and cardiovascular disease is crucial for successful future drug therapy and reducing healthcare expenditure. RECENT FINDINGS Up to 30% of patients admitted with pneumonia develop cardiovascular complications such as heart failure within 10 years of hospital discharge. Recent mechanistic studies have identified inflammation, pneumolysin, platelet activation, and thrombus formation at the center of cardiovascular disease progression. SUMMARY In this review, we will detail current knowledge of the mechanistic interaction between pneumonia and development of cardiovascular disease as well as discuss the current and potential drug therapy targets.
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Tralhão A, Póvoa P. Cardiovascular Events After Community-Acquired Pneumonia: A Global Perspective with Systematic Review and Meta-Analysis of Observational Studies. J Clin Med 2020; 9:E414. [PMID: 32028660 PMCID: PMC7073946 DOI: 10.3390/jcm9020414] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 01/28/2020] [Accepted: 01/31/2020] [Indexed: 12/12/2022] Open
Abstract
Acute cardiovascular disease after community-acquired pneumonia is a well-accepted complication for which definitive treatment strategies are lacking. These complications share some common features but have distinct diagnostic and treatment approaches. We therefore undertook an updated systematic review and meta-analysis of observational studies reporting the incidence of overall complications, acute coronary syndromes, new or worsening heart failure, new or worsening arrhythmias and acute stroke, as well as short-term mortality outcomes. To set a framework for future research, we further included a holistic review of the interplay between the two conditions. From 1984 to 2019, thirty-nine studies were accrued, involving 92,188 patients, divided by setting (inpatients versus outpatients) and clinical severity (low risk versus high risk). Overall cardiac complications occurred in 13.9% (95% confidence interval (CI) 9.6-18.9), acute coronary syndromes in 4.5% (95% CI 2.9-6.5), heart failure in 9.2% (95% CI 6.7-12.2), arrhythmias in 7.2% (95% CI 5.6-9.0) and stroke in 0.71% (95% CI 0.1-3.9) of pooled inpatients. During this period, meta-regression analysis suggests that the incidence of overall and individual cardiac complications is decreasing. After adjusting for confounders, cardiovascular events taking place after community-acquired pneumonia independently increase the risk for short-term mortality (range of odds-ratio: 1.39-5.49). These findings highlight the need for effective, large trial based, preventive and therapeutic interventions in this important patient population.
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Affiliation(s)
- António Tralhão
- Polyvalent Intensive Care Unit, Hospital de São Francisco Xavier, Centro Hospitalar Lisboa Ocidental, Estrada do Forte do Alto do Duque, 1449-005 Lisbon, Portugal;
- Cardiology Department, Hospital de Santa Cruz, Centro Hospitalar Lisboa Ocidental, Avenida Professor Doutor Reinaldo dos Santos, 2790-134 Carnaxide, Portugal
| | - Pedro Póvoa
- Polyvalent Intensive Care Unit, Hospital de São Francisco Xavier, Centro Hospitalar Lisboa Ocidental, Estrada do Forte do Alto do Duque, 1449-005 Lisbon, Portugal;
- NOVA Medical School, CHRH, New University of Lisbon, 1069-056 Lisbon, Portugal
- Center for Clinical Epidemiology and Research Unit of Clinical Epidemiology, OUH Odense University Hospital, DK-5000 Odense C, Denmark
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Putot A, Chague F, Manckoundia P, Cottin Y, Zeller M. Post-Infectious Myocardial Infarction: New Insights for Improved Screening. J Clin Med 2019; 8:E827. [PMID: 31212586 PMCID: PMC6616657 DOI: 10.3390/jcm8060827] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 05/29/2019] [Accepted: 06/04/2019] [Indexed: 12/12/2022] Open
Abstract
Acute infection is suspected of involvement in the onset of acute myocardial infarction (MI). We aimed to assess the incidence, pathogenesis and prognosis of post-infectious MI. All consecutive patients hospitalized for an acute MI in coronary care units were prospectively included. Post-infectious MI was defined by a concurrent diagnosis of acute infection at admission. Type 1 MI (acute plaque disruption) or Type 2 MI (imbalance in oxygen supply/demand) were adjudicated according to the universal definition of MI. From the 4573 patients admitted for acute MI, 466 (10%) had a concurrent acute infection (median age 78 (66-85) y, 60% male), of whom 313 (67%) had a respiratory tract infection. Type 2 MI was identified in 72% of post-infectious MI. Compared with other MI, post-infectious MI had a worse in-hospital outcome (11 vs. 6% mortality, p < 0.01), mostly from cardiovascular causes. After adjusting for confounders, acute infections were no more associated with mortality (odds ratio 0.72; 95% confidence interval 0.43-1.20). In the group of post-infectious MI, Type 1 MI and respiratory tract infection were associated with a worse prognosis (respective odds ratio 2.44; 95% confidence interval: 1.12-5.29, and 2.89; 1.19-6.99). In this large MI survey, post-infectious MI was common, accounting for 10% of all MI, and doubled in-hospital mortality. Respiratory tract infection and Type 1 post-infectious MI were associated with a worse prognosis.
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Affiliation(s)
- Alain Putot
- Geriatrics Internal Medicine Department, Dijon University Hospital, 21079 Dijon CEDEX, France.
- Physiopathologie et Epidémiologie Cérébro-Cardiovasculaires (PEC2), EA7460, Université de Bourgogne Franche-Comté, 21078 Dijon CEDEX, France.
| | - Frédéric Chague
- Physiopathologie et Epidémiologie Cérébro-Cardiovasculaires (PEC2), EA7460, Université de Bourgogne Franche-Comté, 21078 Dijon CEDEX, France.
- Cardiology Department, Dijon University Hospital, 21079 Dijon CEDEX, France.
| | - Patrick Manckoundia
- Geriatrics Internal Medicine Department, Dijon University Hospital, 21079 Dijon CEDEX, France.
| | - Yves Cottin
- Physiopathologie et Epidémiologie Cérébro-Cardiovasculaires (PEC2), EA7460, Université de Bourgogne Franche-Comté, 21078 Dijon CEDEX, France.
- Cardiology Department, Dijon University Hospital, 21079 Dijon CEDEX, France.
| | - Marianne Zeller
- Physiopathologie et Epidémiologie Cérébro-Cardiovasculaires (PEC2), EA7460, Université de Bourgogne Franche-Comté, 21078 Dijon CEDEX, France.
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Feldman C, Normark S, Henriques-Normark B, Anderson R. Pathogenesis and prevention of risk of cardiovascular events in patients with pneumococcal community-acquired pneumonia. J Intern Med 2019; 285:635-652. [PMID: 30584680 DOI: 10.1111/joim.12875] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
It is now well recognized that cardiovascular events (CVE) occur quite commonly, both in the acute phase and in the long-term, in patients with community-acquired pneumonia (CAP). CVE have been noted in up to 30% of patients hospitalized with all-cause CAP. One systematic review and meta-analysis of hospitalized patients with all-cause CAP noted that the incidence rates for overall cardiac events were 17.7%, for incident heart failure were 14.1%, for acute coronary syndromes were 5.3% and for incident cardiac arrhythmias were 4.7%. In the case of pneumococcal CAP, almost 20% of patients studied had one or more of these cardiac events. Recent research has provided insights into the pathogenesis of the acute cardiac events occurring in pneumococcal infections. With respect to the former, key involvements of the major pneumococcal protein virulence factor, pneumolysin, are now well documented, whilst systemic platelet-driven neutrophil activation may also contribute. However, events involved in the pathogenesis of the long-term cardiovascular sequelae remain largely unexplored. Emerging evidence suggests that persistent antigenaemia may predispose to the development of a systemic pro-inflammatory/prothrombotic phenotype underpinning the risk of future cardiovascular events. The current manuscript briefly reviews the occurrence of cardiovascular events in patients with all-cause CAP, as well as in pneumococcal and influenza infections. It highlights the close interaction between influenza and pneumococcal pneumonia. It also includes a brief discussion of mechanisms of the acute cardiac events in CAP. However, the primary focus is on the prevalence, pathogenesis and prevention of the longer-term cardiac sequelae of severe pneumococcal disease, particularly in the context of persistent antigenaemia and associated inflammation.
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Affiliation(s)
- C Feldman
- Department of Internal Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - S Normark
- Department of Microbiology, Tumor and Cell biology, Karolinska Institutet, Stockholm, Sweden.,Clinical Microbiology, Karolinska University Hospital, Stockholm, Sweden.,Lee Kong Chian School of Medicine (LKC), Singapore Centre on Environmental Life Sciences Engineering (SCELCE), Nanyang Technical University, Singapore, Singapore
| | - B Henriques-Normark
- Department of Microbiology, Tumor and Cell biology, Karolinska Institutet, Stockholm, Sweden.,Clinical Microbiology, Karolinska University Hospital, Stockholm, Sweden.,Lee Kong Chian School of Medicine (LKC), Singapore Centre on Environmental Life Sciences Engineering (SCELCE), Nanyang Technical University, Singapore, Singapore
| | - R Anderson
- Department of Immunology and Institute of Cellular and Molecular Medicine, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
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Early diagnosis of atrial fibrillation using a E-health application. Am J Emerg Med 2019; 37:367-370. [PMID: 29970270 DOI: 10.1016/j.ajem.2018.06.061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 06/22/2018] [Accepted: 06/25/2018] [Indexed: 02/07/2023] Open
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Feldman C, Shaddock E. Epidemiology of lower respiratory tract infections in adults. Expert Rev Respir Med 2018; 13:63-77. [DOI: 10.1080/17476348.2019.1555040] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Charles Feldman
- Department of Internal Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Erica Shaddock
- Division of Pulmonology, Department of Internal Medicine, Charlotte Maxeke Johannesburg Academic Hospital and Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
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Rijkers GT, Yousif LI, Spoorenberg SM, van Overveld FJ. Triptych of the Hermit Saints: pneumococcal polysaccharide vaccines for the elderly. Risk Manag Healthc Policy 2018; 11:55-65. [PMID: 29636634 PMCID: PMC5881283 DOI: 10.2147/rmhp.s130405] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Pneumococcal pneumonia is a serious disease with considerable morbidity and mortality in the elderly. Despite adequate antibiotic treatment, the long-term mortality of pneumococcal pneumonia remains high. Preventive measures in the form of vaccination, therefore, are warranted. Twenty-three-valent polysaccharide vaccines have a broad coverage but limited efficacy. Pneumococcal conjugate vaccines have been shown in children to be able to prevent invasive and mucosal pneumococcal diseases. It should be realized that the serotype composition of current pneumococcal conjugate vaccines is not tailored for the elderly, and that replacement disease can occur. Yet, the current 13-valent conjugate vaccine has been shown to protect against infections with vaccine serotypes. Long-term mortality of pneumococcal pneumonia should be included in policy making about the introduction of these vaccines for the elderly.
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Affiliation(s)
- Ger T Rijkers
- Department of Science, University College Roosevelt, Middelburg, the Netherlands.,Department of Medical Microbiology and Immunology, St. Antonius Hospital, Nieuwegein, the Netherlands
| | - Laura Ie Yousif
- Department of Science, University College Roosevelt, Middelburg, the Netherlands
| | | | - Frans J van Overveld
- Department of Science, University College Roosevelt, Middelburg, the Netherlands
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Anderson R, Nel JG, Feldman C. Multifaceted Role of Pneumolysin in the Pathogenesis of Myocardial Injury in Community-Acquired Pneumonia. Int J Mol Sci 2018; 19:E1147. [PMID: 29641429 PMCID: PMC5979279 DOI: 10.3390/ijms19041147] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 03/14/2018] [Accepted: 03/21/2018] [Indexed: 12/14/2022] Open
Abstract
Pneumolysin (PLY), a member of the family of Gram-positive bacterial, cholesterol-dependent, β-barrel pore-forming cytolysins, is the major protein virulence factor of the dangerous respiratory pathogen, Streptococcus pneumoniae (pneumococcus). PLY plays a major role in the pathogenesis of community-acquired pneumonia (CAP), promoting colonization and invasion of the upper and lower respiratory tracts respectively, as well as extra-pulmonary dissemination of the pneumococcus. Notwithstanding its role in causing acute lung injury in severe CAP, PLY has also been implicated in the development of potentially fatal acute and delayed-onset cardiovascular events, which are now recognized as being fairly common complications of this condition. This review is focused firstly on updating mechanisms involved in the immunopathogenesis of PLY-mediated myocardial damage, specifically the direct cardiotoxic and immunosuppressive activities, as well as the indirect pro-inflammatory/pro-thrombotic activities of the toxin. Secondly, on PLY-targeted therapeutic strategies including, among others, macrolide antibiotics, natural product antagonists, cholesterol-containing liposomes, and fully humanized monoclonal antibodies, as well as on vaccine-based preventive strategies. These sections are preceded by overviews of CAP in general, the role of the pneumococcus as the causative pathogen, the occurrence and types of CAP-associated cardiac complication, and the structure and biological activities of PLY.
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Affiliation(s)
- Ronald Anderson
- Department of Immunology and Institute for Cellular and Molecular Medicine, Faculty of Health Sciences, University of Pretoria, Pretoria 0001, South Africa.
| | - Jan G Nel
- Department of Haematology, Faculty of Health Sciences, University of Pretoria and Tshwane Academic Division of the National Health Laboratory Service, Pretoria 0001, South Africa.
| | - Charles Feldman
- Division of Pulmonology, Department of Internal Medicine, Charlotte Maxeke Johannesburg Academic Hospital and Faculty of Health Sciences, University of the Witwatersrand, Johannesburg 0002, South Africa.
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