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Barratt J, Lafayette R, Kristensen J, Stone A, Cattran D, Floege J, Tesar V, Trimarchi H, Zhang H, Eren N, Paliege A, Rovin BH, Karl A, Losisolo P, Trimarchi H, Hoyos IG, Lampo MG, Monkowski M, De La Fuente J, Alvarez M, Stoppa D, Chiurchiu C, Novoa PA, Orias M, Barron MB, Giotto A, Arriola M, Cassini E, Maldonado R, Dionisi MP, Ryan J, Toussaint N, Luxton G, Peh CA, Levidiotis V, Francis R, Phoon R, Fedosiuk E, Toropilov D, Yakubtsevich R, Mikhailova E, Bovy C, Demoulin N, Hougardy JM, Maes B, Speeckaert M, Laurin LP, Barbour S, Masse M, Hladunewich M, Reich H, Cournoyer S, Tennankore K, Barbour S, Lv J, Liu Z, Wang C, Li S, Luo Q, Ni Z, Yan T, Fu P, Cheng H, Liu B, Lu W, Wang J, Chen Q, Wang D, Xiong Z, Chen M, Xu Y, Wei J, Pai P, Chen L, Rehorova J, Maixnerova D, Safranek R, Rychlik I, Hruby M, Makela S, Vaaraniemi K, Ortiz F, Alamartine E, Daroux M, Cartery C, Vrtovsnik F, Serre JE, Stamellou E, Vielhauer V, Hugo C, Budde K, Otte B, Nitschke M, Ntounousi E, Boletis I, Papagianni A, Goumenos D, Stylianou K, Zermpala S, Esposito C, Cozzolino MG, Viganò SM, Gesualdo L, Nowicki M, Stompor T, Kurnatowska I, Kim SG, Kim YL, Na KR, Kim DK, Kim SH, Porras LQ, Garcia ER, Pamplona IA, Segarra A, Goicoechea M, Fellstrom B, Lundberg S, Hemmingsson P, Guron G, Sandell A, Chen CH, Tokgoz B, Duman S, Altiparmak MR, Ergul M, Maxwell P, Mark P, McCafferty K, Khwaja A, Cheung CK, Hall M, Power A, Kanigicherla D, Baker R, Moriarty J, Mohamed A, Aiello J, Canetta P, Ayoub I, Robinson D, Thakar S, Mottl A, Sachmechi I, Fischbach B, Singh H, Mulhern J, Kamal F, Linfert D, Rizk D, Wadhwani S, Sarav M, Campbell K, Coppock G, Luciano R, Sedor J, Avasare R, Lau WL. Results from part A of the multi-center, double-blind, randomized, placebo-controlled NefIgArd trial, which evaluated targeted-release formulation of budesonide for the treatment of primary immunoglobulin A nephropathy. Kidney Int 2023; 103:391-402. [PMID: 36270561 DOI: 10.1016/j.kint.2022.09.017] [Citation(s) in RCA: 72] [Impact Index Per Article: 72.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 09/23/2022] [Accepted: 09/29/2022] [Indexed: 11/06/2022]
Abstract
The therapeutic potential of a novel, targeted-release formulation of oral budesonide (Nefecon) for the treatment of IgA nephropathy (IgAN) was first demonstrated by the phase 2b NEFIGAN trial. To verify these findings, the phase 3 NefigArd trial tested the efficacy and safety of nine months of treatment with Nefecon (16 mg/d) versus placebo in adult patients with primary IgAN at risk of progressing to kidney failure (ClinicalTrials.gov: NCT03643965). NefIgArd was a multicenter, randomized, double-blind, placebo-controlled two-part trial. In Part A, 199 patients with IgAN were treated with Nefecon or placebo for nine months and observed for an additional three months. The primary endpoint for Part A was 24-hour urine protein-to-creatinine ratio (UPCR) after nine months. Secondary efficacy outcomes evaluated included estimated glomerular filtration rate (eGFR) at nine and 12 months and the UPCR at 12 months. At nine months, UPCR was 27% lower in the Nefecon group compared with placebo, along with a benefit in eGFR preservation corresponding to a 3.87 ml/min/1.73 m2 difference versus placebo (both significant). Nefecon was well-tolerated, and treatment-emergent adverse events were mostly mild to moderate in severity and reversible. Part B is ongoing and will be reported on later. Thus, NefIgArd is the first phase 3 IgA nephropathy trial to show clinically important improvements in UPCR and eGFR and confirms the findings from the phase 2b NEFIGAN study.
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Affiliation(s)
- Jonathan Barratt
- College of Medicine Biological Sciences and Psychology, University of Leicester, Leicester, UK
| | - Richard Lafayette
- Division of Nephrology, Department of Medicine, Stanford University, Stanford, California, USA
| | | | | | - Daniel Cattran
- Division of Nephrology, Toronto General Hospital Research Institute, University of Toronto, Toronto, Ontario, Canada
| | - Jürgen Floege
- Department of Nephrology and Clinical Immunology, Rheinisch Westfälische Technische Hochschule Aachen University Hospital, Aachen, Germany
| | - Vladimir Tesar
- Department of Nephrology, 1st School of Medicine and General University Hospital, Charles University, Prague, Czech Republic
| | - Hernán Trimarchi
- Nephrology Service, Hospital Británico de Buenos Aires, Buenos Aires, Argentina
| | - Hong Zhang
- Renal Division, Peking University First Hospital, Peking University Institute of Nephrology, Beijing, China
| | - Necmi Eren
- Department of Nephrology, Kocaeli University, Kocaeli, Turkey
| | - Alexander Paliege
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany
| | - Brad H Rovin
- Division of Nephrology, the Ohio State University Wexner Medical Center, Columbus, Ohio, USA.
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Bajaj T, Ismail N, Trivedi A, Sarav M. Peritoneal Dialysis-Related Peritonitis With Acinetobacter Pittii: A Case Report. J Investig Med High Impact Case Rep 2023; 11:23247096221148264. [PMID: 36624661 PMCID: PMC9834918 DOI: 10.1177/23247096221148264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
We demonstrate the first reported case of peritoneal dialysis (PD)-related peritonitis with Acinetobacter pittii. Although previous reports have reported the uncommon similar infection in the larger Acinetobacter calcoaceticus-baumannii complex group of organisms, none have particularly focused on A pittii. Furthermore, we present a case of a young man with end-stage renal disease on PD who had a severe infection with A pittii. Although the organism was sensitive to ceftazidime, and despite a 4-week extended course of intraperitoneal antibiotics, the patient had a worsening infection leading to the removal of the PD catheter. Furthermore, the case illustrates the importance of proper sterile technique and hand hygiene, as this may have been the nidus of infection for this case.
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Affiliation(s)
- Tushar Bajaj
- The University of Chicago Pritzker School of Medicine, Chicago, IL, USA
| | - Nader Ismail
- The University of Chicago Pritzker School of Medicine, Chicago, IL, USA
| | - Anuja Trivedi
- Jackson Park Hospital & Medical Center, Chicago, IL, USA
| | - Menaka Sarav
- Northshore University HealthSystem, Evanston, IL, USA
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Sullivan K, Kaminer LS, Grinblatt DL, Campbell NP, Nocon CC, Harper AJ, Kang JH, Sarav M, Curtis BR, Brockstein BE. Trastuzumab-Induced Thrombocytopenia Correlated by Drug-Dependent Platelet Antibodies. JCO Oncol Pract 2020; 17:153-155. [PMID: 33270522 DOI: 10.1200/op.20.00734] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | | | | | | | | | | | - Jason H Kang
- NorthShore University HealthSystem, Evanston, IL
| | - Menaka Sarav
- NorthShore University HealthSystem, Evanston, IL
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Meyer D, Mohan A, Subev E, Sarav M, Sturgill D. Acute Kidney Injury Incidence in Hospitalized Patients and Implications for Nutrition Support. Nutr Clin Pract 2020; 35:987-1000. [DOI: 10.1002/ncp.10595] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Affiliation(s)
- Daniel Meyer
- Division of Nephrology Department of Medicine Medical College of Wisconsin Milwaukee Wisconsin USA
| | - Anju Mohan
- Division of Nephrology, Department of Medicine North Shore University Healthsystem Evanston Illinois USA
| | - Emiliya Subev
- Department of Clinical Nutrition North Shore University Healthsystem Evanston Illinois USA
| | - Menaka Sarav
- Division of Nephrology, Department of Medicine North Shore University Healthsystem Evanston Illinois USA
| | - Daniel Sturgill
- Division of Nephrology Department of Medicine Medical College of Wisconsin Milwaukee Wisconsin USA
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Abstract
PURPOSE OF REVIEW To review the available literature/evidence on low carbohydrate/high fat (LCHF) and low carbohydrate ketogenic (LCKD) diets' effects on human athletic performance and to provide a brief review of the physiology and history of energy systems of exercise. RECENT FINDINGS Multiple studies have been conducted in an attempt to answer this question, many within the last 3-5 years. Studies are heterogenous in design, intervention, and outcome measures. Current available data show that LCHF and LCKD do not significantly enhance or impair performance in endurance or strength activities. However, there is a trend towards improved body composition (greater percent lean body mass) across multiple studies. While this may not translate to enhanced performance in the primarily laboratory conditions in the reviewed studies, there could be a benefit in sports in which an athlete's strength-to-weight ratio is a significant determinant of outcome.
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Affiliation(s)
- Matthew B Kaspar
- Department of Internal Medicine, Division of Gastroenterology, Hepatology, and Nutrition, Virginia Commonwealth University Medical Center, 1200 East Broad Street, P.O. Box 980509, Richmond, VA, 23298, USA.
| | - Kerstin Austin
- Division of Gastroenterology and Hepatology, University of Wisconsin School of Medicine and Public Health, Madison, WI, 53705, USA
| | - Martin Huecker
- Department of Emergency Medicine, University of Louisville School of Medicine, Louisville, KY, USA
| | - Menaka Sarav
- Division of Nephrology and Hypertension, NorthShore University Health System, University of Chicago, Chicago, USA
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Abstract
PURPOSE OF REVIEW The purpose of this review is to provide background on the present literature regarding the utility and effectiveness of protein supplements, including protein source and nutrient timing. RECENT FINDINGS In the setting of adequate dietary protein consumption, research suggests some benefit particularly in sport or exercise activities. Protein supplements command a multi-billion-dollar market with prevalent use in sports. Many individuals, including athletes, do not consume optimal dietary protein on a daily basis. High-protein diets are remarkably safe in healthy subjects, especially in the short term. Some objective outcomes are physiologic and may not translate to clinically relevant outcomes. Athletes should, however, consider long-term implications when consuming high quantities of protein in dietary or supplement form.
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Affiliation(s)
- Martin Huecker
- Dept of Emergency Medicine, University of Louisville School of Medicine, 530 S Jackson St C1H17, Louisville, KY, 40202, USA.
| | - Menaka Sarav
- Division of Nephrology and Hypertension, NorthShore University HealthSystem-University of Chicago, Pritzker School of Medicine, Chicago, IL, USA
| | - Michelle Pearlman
- Department of Medicine, Division of Gastroenterology & Hepatology, University of Miami Health Systems, Miller School of Medicine, Miami, FL, USA
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McKnight CL, Newberry C, Sarav M, Martindale R, Hurt R, Daley B. Refeeding Syndrome in the Critically Ill: a Literature Review and Clinician's Guide. Curr Gastroenterol Rep 2019; 21:58. [PMID: 31758276 DOI: 10.1007/s11894-019-0724-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
PURPOSE OF REVIEW To provide an overview of current methods of diagnosis and management of refeeding syndrome in the critically ill patient population. RECENT FINDINGS Despite recent publications indicating refeeding syndrome (RFS) is an ongoing problem in critically ill patients, there is no standard for the diagnosis and management of this life-threatening condition. There is not a "gold standard" nutrition assessment tool for the critically ill. Currently, the National Institute for Health and Clinical Excellence criteria represent the best clinical assessment tool for RFS. Diagnosis and management with the help of a multidisciplinary metabolic team can decrease morbidity and mortality. Although a universal definition of RFS has yet to be defined, the diagnosis is made in patients with moderate to severe malnutrition who develop electrolyte imbalance after beginning nutritional support. The imbalances potentially can lead to cardiac, pulmonary, and gastrointestinal complications and failure. Standardizing a multidisciplinary nutrition care plan and formulating a protocol for critically ill patients who develop RFS can potentially decrease complication rates and overall mortality.
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Affiliation(s)
- C L McKnight
- Department of Trauma/Surgical Critical Care, University of Tennessee-Knoxville, 1924 Alcoa Highway Box U-11, Knoxville, TN, 37920, USA.
| | - C Newberry
- Division of Gastroenterology & Hepatology, Weill Cornell Medical Center, 1283 York Avenue, 9th Floor, New York, NY, 10065, USA
| | - M Sarav
- Section of Nephrology and Hypertension, NorthShore University Health Systems, University of Chicago, Chicago, USA
| | - R Martindale
- Department of General Surgery, Oregon Health Science University, 3303 SW Bond Ave Fl 6, Portland, OR, 97239, USA
| | - R Hurt
- Division of Gastroenterology & Hepatology, Mayo Clinic, Rochester, MN, USA
| | - B Daley
- Department of Trauma/Surgical Critical Care, University of Tennessee Graduate School of Medicine, 1924 Alcoa Highway Box U-11, Knoxville, TN, 37920, USA
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Affiliation(s)
- Menaka Sarav
- Division of Nephrology and Hypertension, NorthShore University HealthSystem, Evanston, Illinois
| | - Csaba Pal Kovesdy
- Nephrology Section, Memphis Veterans Affairs Medical Center, Memphis, Tennessee; and
- Division of Nephrology, University of Tennessee Health Science Center, Memphis, Tennessee
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Kaur A, Diaz-Perez J, Weiner R, Cibull T, Sarav M, Victor T. Histiocytic Glomerulopathy as a Manifestation of Macrophage Activation Syndrome. Am J Clin Pathol 2018. [DOI: 10.1093/ajcp/aqy090.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Abstract
Intradialytic parenteral nutrition (IDPN) is a form of supplemental nutrition used to treat patients with malnutrition who receive hemodialysis. Once the diagnosis of malnutrition is made in such patients, encouragement of oral intake is the first-line treatment. If this fails, then enteral or parenteral nutrition may be needed. This review examines the literature on the use of IDPN and summarizes the current recommendations. There is considerable controversy over indications and benefits of IDPN, and well-controlled, long-term studies are needed to help tease out these issues. In the interim, clinical judgment should be used when considering IDPN for individual patients.
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Affiliation(s)
- Menaka Sarav
- Division of Nephrology and Hypertension, Department of Medicine, NorthShore University HealthSystem, Evanston, Illinois, USA
| | - Allon N Friedman
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
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Sarav M, McKnight CL, Newberry CA. Protein Intake in Chronic Kidney Disease. Curr Nutr Rep 2017. [DOI: 10.1007/s13668-017-0213-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Affiliation(s)
- Jan Wernerman
- Karolinska University Hospital Huddinge and Karolinska Institutet, Stockholm, Sweden
| | | | - Douglas Paddon-Jones
- Department of Nutrition and Metabolism, The University of Texas Medical Branch, Galveston, Texas, USA
| | - Menaka Sarav
- Section of Nephrology and Hypertension, NorthShore University HealthSystem, University of Chicago, Evanston, Illinois, USA
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Patel JJ, McClain CJ, Sarav M, Hamilton-Reeves J, Hurt RT. Protein Requirements for Critically Ill Patients With Renal and Liver Failure. Nutr Clin Pract 2017; 32:101S-111S. [PMID: 28208022 DOI: 10.1177/0884533616687501] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Diseases leading to critical illness induce proteolysis resulting in muscle wasting and negative nitrogen balance. Muscle wasting has been associated with poor intensive care unit (ICU)-related outcomes, including an increased risk for mortality. Acute kidney injury (AKI) represents a common organ dysfunction associated with ICU-related disorders, such as sepsis, trauma, and respiratory failure. AKI and renal replacement therapy lead to amino acid loss. Decompensated liver cirrhosis (DLC) and acute liver failure (ALF) represent more severe forms of liver dysfunction leading to ICU admission. DLC and ALF are associated with proteolysis and amino acid loss. AKI, DLC, and ALF uniquely contribute to negative nitrogen balance. The purpose of this review is to outline proteolysis associated with critical illness; define specific protein abnormalities in AKI, DLC, and ALF; define protein requirements in AKI, DLC, and ALF; and discuss barriers associated with optimal protein supplementation in these disorders.
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Affiliation(s)
- Jayshil J Patel
- 1 Division of Pulmonary and Critical Care Medicine, Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Craig J McClain
- 2 Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, Department of Pharmacology and Toxicology, University of Louisville, and Robley Rex VA Medical Center, Louisville, Kentucky, USA
| | - Menaka Sarav
- 3 Division of Nephrology, Department of Medicine, NorthShore University Hospital Health System, University of Chicago, Chicago, Illinois, USA
| | - Jill Hamilton-Reeves
- 4 Department of Dietetics and Nutrition, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Ryan T Hurt
- 5 Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA
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Morris CR, Hamilton-Reeves J, Martindale RG, Sarav M, Ochoa Gautier JB. Acquired Amino Acid Deficiencies: A Focus on Arginine and Glutamine. Nutr Clin Pract 2017; 32:30S-47S. [PMID: 28388380 DOI: 10.1177/0884533617691250] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Nonessential amino acids are synthesized de novo and therefore not diet dependent. In contrast, essential amino acids must be obtained through nutrition since they cannot be synthesized internally. Several nonessential amino acids may become essential under conditions of stress and catabolic states when the capacity of endogenous amino acid synthesis is exceeded. Arginine and glutamine are 2 such conditionally essential amino acids and are the focus of this review. Low arginine bioavailability plays a pivotal role in the pathogenesis of a growing number of varied diseases, including sickle cell disease, thalassemia, malaria, acute asthma, cystic fibrosis, pulmonary hypertension, cardiovascular disease, certain cancers, and trauma, among others. Catabolism of arginine by arginase enzymes is the most common cause of an acquired arginine deficiency syndrome, frequently contributing to endothelial dysfunction and/or T-cell dysfunction, depending on the clinical scenario and disease state. Glutamine, an arginine precursor, is one of the most abundant amino acids in the body and, like arginine, becomes deficient in several conditions of stress, including critical illness, trauma, infection, cancer, and gastrointestinal disorders. At-risk populations are discussed together with therapeutic options that target these specific acquired amino acid deficiencies.
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Affiliation(s)
- Claudia R Morris
- 1 Department of Pediatrics, Division of Pediatric Emergency Medicine, Emory-Children's Center for Cystic Fibrosis and Airways Disease Research, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Jill Hamilton-Reeves
- 2 Department of Dietetics and Nutrition, University of Kansas, Kansas City, Kansas, USA
| | - Robert G Martindale
- 3 Department of Surgery, Oregon Health and Science University, Portland, Oregon, USA
| | - Menaka Sarav
- 4 Department of Medicine, Division of Nephrology, Northshore University Health System, University of Chicago, Chicago, Illinois, USA
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Sarav M, Sprague SM. Cinacalcet hydrochloride for the treatment of hyperparathyroidism. Expert Opin Orphan Drugs 2014. [DOI: 10.1517/21678707.2014.940311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Rakotz MK, Ewigman BG, Sarav M, Ross RE, Robicsek A, Konchak CW, Gavagan TF, Baker DW, Hyman DJ, Anderson KP, Masi CM. A technology-based quality innovation to identify undiagnosed hypertension among active primary care patients. Ann Fam Med 2014; 12:352-8. [PMID: 25024244 PMCID: PMC4096473 DOI: 10.1370/afm.1665] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
PURPOSE The goal of this study was to develop a technology-based strategy to identify patients with undiagnosed hypertension in 23 primary care practices and integrate this innovation into a continuous quality improvement initiative in a large, integrated health system. METHODS In phase 1, we reviewed electronic health records (EHRs) using algorithms designed to identify patients at risk for undiagnosed hypertension. We then invited each at-risk patient to complete an automated office blood pressure (AOBP) protocol. In phase 2, we instituted a quality improvement process that included regular physician feedback and office-based computer alerts to evaluate at-risk patients not screened in phase 1. Study patients were observed for 24 additional months to determine rates of diagnostic resolution. RESULTS Of the 1,432 patients targeted for inclusion in the study, 475 completed the AOBP protocol during the 6 months of phase 1. Of the 1,033 at-risk patients who remained active during phase 2, 740 (72%) were classified by the end of the follow-up period: 361 had hypertension diagnosed, 290 had either white-coat hypertension, prehypertension, or elevated blood pressure diagnosed, and 89 had normal blood pressure. By the end of the follow-up period, 293 patients (28%) had not been classified and remained at risk for undiagnosed hypertension. CONCLUSIONS Our technology-based innovation identified a large number of patients at risk for undiagnosed hypertension and successfully classified the majority, including many with hypertension. This innovation has been implemented as an ongoing quality improvement initiative in our medical group and continues to improve the accuracy of diagnosis of hypertension among primary care patients.
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Affiliation(s)
- Michael K Rakotz
- Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - Bernard G Ewigman
- NorthShore University HealthSystem, Evanston, Illinois Pritzker School of Medicine, The University of Chicago, Chicago, Illinois
| | - Menaka Sarav
- NorthShore University HealthSystem, Evanston, Illinois Pritzker School of Medicine, The University of Chicago, Chicago, Illinois
| | - Ruth E Ross
- NorthShore University HealthSystem, Evanston, Illinois Pritzker School of Medicine, The University of Chicago, Chicago, Illinois
| | - Ari Robicsek
- NorthShore University HealthSystem, Evanston, Illinois Pritzker School of Medicine, The University of Chicago, Chicago, Illinois
| | | | | | - David W Baker
- Feinberg School of Medicine, Northwestern University, Chicago, Illinois
| | - David J Hyman
- Baylor College of Medicine, Baylor University, Houston, Texas
| | - Kenneth P Anderson
- NorthShore University HealthSystem, Evanston, Illinois Pritzker School of Medicine, The University of Chicago, Chicago, Illinois
| | - Christopher M Masi
- NorthShore University HealthSystem, Evanston, Illinois Pritzker School of Medicine, The University of Chicago, Chicago, Illinois
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Puri TS, Shakaib MI, Chang A, Mathew L, Olayinka O, Minto AWM, Sarav M, Hack BK, Quigg RJ. Chronic kidney disease induced in mice by reversible unilateral ureteral obstruction is dependent on genetic background. Am J Physiol Renal Physiol 2010; 298:F1024-32. [PMID: 20089676 DOI: 10.1152/ajprenal.00384.2009] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Chronic kidney disease (CKD) begins with renal injury; the progression thereafter depends upon a number of factors, including genetic background. Unilateral ureteral obstruction (UUO) is a well-described model of renal fibrosis and as such is considered a model of CKD. We used an improved reversible unilateral ureteral obstruction (rUUO) model in mice to study the strain dependence of development of CKD after obstruction-mediated injury. C57BL/6 mice developed CKD after reversal of three or more days of ureteral obstruction as assessed by blood urea nitrogen (BUN) measurements (>40 mg/dl). In contrast, BALB/c mice were resistant to CKD with up to 10 days ureteral obstruction. During rUUO, C57BL/6 mice exhibited pronounced inflammatory and intrinsic proliferative cellular responses, disruption of renal architecture, and ultimately fibrosis. By comparison, BALB/c mice had more controlled and measured extrinsic and intrinsic responses to injury with a return to normal within several weeks after release of ureteral obstruction. Our findings provide a model that allows investigation of the genetic basis of events during recovery from injury that contribute to the development of CKD.
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Affiliation(s)
- Tipu S Puri
- Section of Nephrology, Department of Medicine, University of Chicago, 5841 South Maryland Ave., Chicago, IL 60637, USA.
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Abstract
The widely distributed neonatal Fc receptor (FcRn) contributes to maintaining serum levels of albumin and IgG in adults. In the kidney, FcRn is expressed on the podocytes and the brush border of the proximal tubular epithelium. Here, we evaluated the role of renal FcRn in albumin and IgG metabolism. Compared with wild-type controls, FcRn(-/-) mice had a lower t((1/2)) for albumin (28.7 versus 39.9 h) and IgG (29.5 versus 66.1 h). Renal loss of albumin could account for the former, suggested by the progressive development of hypoalbuminemia in wild-type mice transplanted with FcRn-deficient kidneys. Furthermore, serum albumin levels returned to normal in FcRn(-/-) recipients of wild-type kidneys after removing the native FcRn-deficient kidneys. In contrast, renal loss could not account for the enhanced elimination of IgG in FcRn(-/-) mice. These mice had minimal urinary excretion of native and labeled IgG, which increased to wild-type levels in FcRn(-/-) recipients of a single FcRn-sufficient kidney (t((1/2)) of IgG was 21.7 h). Taken together, these data suggest that renal FcRn reclaims albumin, thereby maintaining the serum concentration of albumin, but facilitates the loss of IgG from plasma protein pools.
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Affiliation(s)
- Menaka Sarav
- Section of Nephrology, Department of Medicine, The University of Chicago, Chicago, IL 60637, USA
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Bao L, Wang Y, Chen P, Sarav M, Haas M, Minto AW, Petkova M, Quigg RJ. Mesangial cell complement receptor 1-related protein y limits complement-dependent neutrophil accumulation in immune complex glomerulonephritis. Immunology 2009; 128:e895-904. [PMID: 19740350 DOI: 10.1111/j.1365-2567.2009.03102.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
The absence of complement receptor 1 (CR1) related gene/protein y (Crry) leads to embryonic lethality as a result of unrestricted complement activation and concomitant neutrophil infiltration. Here we used Crry(-/-)C3(+/-) mice to investigate the role of Crry in the pathogenesis of immune complex glomerulonephritis (GN). After 3 weeks of immunization with horse spleen apoferritin, six of nine Crry(-/-) C3(+/-) mice and none of the six control C3(+/-) mice developed proliferative GN (P = 0.010). After 5 weeks of immunization, GN scores in Crry(-/-) C3(+/-) mice were 0.67 +/- 0.22 mean +/- standard error of the mean (SEM), compared with 0.32 +/- 0.16 in C3(+/-) mice. Glomerular hypercellularity was attributable to neutrophil infiltration in mice with GN (1.7 +/- 0.3/glomerulus) compared with those without GN (0.4 +/- 0.1/glomerulus) (P = 0.001). Absent staining for alpha-smooth muscle actin and proliferating cell nuclear antigen suggested that mesangial cell proliferation did not play a significant role in this model. Serum C3 levels in Crry(-/-) C3(+/-) mice were approximately 20% and 30% those of wild-type mice and C3(+/-) mice, respectively. To determine whether this acquired hypocomplementaemia was relevant to this GN model system, Crry(-/-) C3(+/-) mouse kidneys were transplanted into wild-type mice followed by immunization with apoferritin for 1 or 2 weeks. Surprisingly, none of the Crry(-/-) C3(+/-) mouse kidneys developed GN at these early time-points, indicating that increasing circulating C3 levels several-fold did not increase susceptibility to GN. Renal expression of decay-accelerating factor was not different among any of the groups studied. Thus, our data indicate that mesangial cell Crry limits complement activation and subsequent neutrophil recruitment in the setting of local immune complex deposition.
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Affiliation(s)
- Lihua Bao
- The University of Chicago, Chicago, IL 60637, USA.
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