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  • 1
    In: Journal of the American Heart Association, Ovid Technologies (Wolters Kluwer Health), Vol. 9, No. 13 ( 2020-07-07)
    Abstract: Sleep‐disordered breathing ( SDB ) is considered a strong risk factor for hypertension in the general population. This disturbance is common in end‐stage kidney disease patients on long‐term hemodialysis and improves early on after renal transplantation. Whether SDB may be a risk factor for hypertension in renal transplant patients is unclear. Methods and Results We investigated the long‐term evolution of simultaneous polysomnographic and 24‐hour ambulatory blood pressure (BP) monitoring recordings in a cohort of 221 renal transplant patients. Overall, 404 paired recordings were made over a median follow‐up of 35 months. A longitudinal data analysis was performed by the mixed linear model. The apnea‐hypopnea index increased from a median baseline value of 1.8 (interquartile range, 0.6–5.0) to a median final value of 3.6 (interquartile range, 1.7–10.4; P =0.009). Repeated categorical measurements of the apnea‐hypopnea index were directly associated with simultaneous 24‐hour, daytime, and nighttime systolic ambulatory BP monitoring (adjusted analyses; P ranging from 0.002–0.01). In a sensitivity analysis restricted to 139 patients with at least 2 visits, 24‐hour, daytime, and nighttime systolic BP significantly increased across visits ( P 〈 0.05) in patients with worsening SDB (n=40), whereas the same BP metrics did not change in patients (n=99) with stable apnea‐hypopnea index. Conclusions In renal transplant patients, worsening SDB associates with a parallel increase in average 24‐hour, daytime, and nighttime systolic BP . These data are compatible with the hypothesis that the link between SDB and hypertension is causal in nature. Clinical trials are, however, needed to definitively test this hypothesis.
    Type of Medium: Online Resource
    ISSN: 2047-9980
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2020
    detail.hit.zdb_id: 2653953-6
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  • 2
    In: Molecular and Clinical Oncology, Spandidos Publications, ( 2019-05-16)
    Type of Medium: Online Resource
    ISSN: 2049-9450 , 2049-9469
    Language: Unknown
    Publisher: Spandidos Publications
    Publication Date: 2019
    detail.hit.zdb_id: 2796865-0
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  • 3
    In: Clinical Chemistry and Laboratory Medicine (CCLM), Walter de Gruyter GmbH, Vol. 57, No. 8 ( 2019-07-26), p. 1162-1168
    Abstract: Excessive sodium intake is a risk factor for hypertension, cardiovascular disease and the risk for kidney failure in chronic kidney disease (CKD) patients. Methods We tested the diagnostic performance and the feasibility of an inexpensive method based on urine chloride strips for self-monitoring sodium intake in a series of 72 CKD patients. Results Twenty-four hour urinary chloride as measured by the reactive strips and 24 h urinary sodium were interrelated (r=0.59, p 〈 0.001). Forty-nine out of 72 patients (78%) had a 24 h urinary sodium 〉 100 mmol/24 h, i.e. the upper limit recommended by current CKD guidelines. The strip method had 75.5% sensitivity and 82.6% specificity to correctly classify patients with urine sodium 〉 100 mmol/24 h. The positive and the negative predictive values were 90.2% and 61.3%, respectively. The overall accuracy (ROC curve analysis) of urine chloride self-measurement for the 〉 100 mmol/24 h sodium threshold was 87% (95% CI: 77%–97%). The large majority of patients (97%) perceived the test as useful to help compliance with the prescribed dietary sodium and considered the test as simple and of immediate application (58%) or feasible but requiring attention (39%). Conclusions A simple and inexpensive test for urine chloride measurement has a fairly good performance for the diagnosis of excessive sodium intake. The test is feasible and it is perceived by CKD patients as helpful for enhancing compliance to the dietary sodium recommendations. The usefulness of this test for improving hypertension control in CKD patients will be tested in a clinical trial (Clinicaltrials.gov RF-2010-2314890).
    Type of Medium: Online Resource
    ISSN: 1437-4331 , 1434-6621
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2019
    detail.hit.zdb_id: 1492732-9
    SSG: 15,3
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  • 4
    In: Kidney and Blood Pressure Research, S. Karger AG, Vol. 39, No. 2-3 ( 2014), p. 205-211
    Abstract: 〈 b 〉 〈 i 〉 Background/Aims: 〈 /i 〉 〈 /b 〉 Scarce physical activity predicts shorter survival in dialysis patients. However, the relationship between physical (motor) fitness and clinical outcomes has never been tested in these patients. 〈 b 〉 〈 i 〉 Methods: 〈 /i 〉 〈 /b 〉 We tested the predictive power of an established metric of motor fitness, the Six-Minute Walking Test (6MWT), for death, cardiovascular events and hospitalization in 296 dialysis patients who took part in the trial EXCITE (ClinicalTrials.gov Identifier: NCT01255969). 〈 b 〉 〈 i 〉 Results: 〈 /i 〉 〈 /b 〉 During follow up 69 patients died, 90 had fatal and non-fatal cardiovascular events, 159 were hospitalized and 182 patients had the composite outcome. In multivariate Cox models - including the study allocation arm and classical and non-classical risk factors - an increase of 20 walked metres during the 6MWT was associated to a 6% reduction of the risk for the composite end-point (P=0.001) and a similar relationship existed between the 6MWT, mortality (P 〈 0.001) and hospitalizations (P=0.03). A similar trend was observed for cardiovascular events but this relationship did not reach statistical significance (P=0.09). 〈 b 〉 〈 i 〉 Conclusions: 〈 /i 〉 〈 /b 〉 Poor physical performance predicts a high risk of mortality, cardiovascular events and hospitalizations in dialysis patients. Future studies, including phase-2 EXCITE, will assess whether improving motor fitness may translate into better clinical outcomes in this high risk population.
    Type of Medium: Online Resource
    ISSN: 1420-4096 , 1423-0143
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2014
    detail.hit.zdb_id: 1482922-8
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  • 5
    In: Nephrology Dialysis Transplantation, Oxford University Press (OUP), Vol. 36, No. 7 ( 2021-06-28), p. 1192-1199
    Abstract: Adherence to low salt diets and control of hypertension remain unmet clinical needs in chronic kidney disease (CKD) patients. Methods We performed a 6-month multicentre randomized trial in non-compliant patients with CKD followed in nephrology clinics testing the effect of self-measurement of urinary chloride (69 patients) as compared with standard care (69 patients) on two primary outcome measures, adherence to a low sodium (Na) diet ( & lt;100 mmol/day) as measured by 24-h urine Na (UNa) excretion and 24-h ambulatory blood pressure (ABPM) monitoring. Results In the whole sample (N = 138), baseline UNa and 24-h ABPM were143 ± 64 mmol/24 h and 131 ± 18/72 ± 10 mmHg, respectively, and did not differ between the two study arms. Patients in the active arm of the trial used & gt;80% of the chloride strips provided to them at the baseline visit and at follow-up visits. At the third month, UNa was 35 mmol/24 h (95% CI 10.8–58.8 mmol/24 h; P = 0.005) lower in the active arm than the control arm, whereas at 6 months the between-arms difference in UNa decreased and was no longer significant [23 mmol/24 h (95% CI −5.6–50.7); P = 0.11]. The 24-h ABPM changes as well as daytime and night-time BP changes at 3 and 6 months were similar in the two study arms (Month 3, P = 0.69–0.99; Month 6, P = 0.73–0.91). Office BP, the use of antihypertensive drugs, estimated Glomerular Filtration Rate (eGFR) and proteinuria remained unchanged across the trial. Conclusions The application of self-measurement of urinary chloride to guide adherence to a low salt diet had a modest effect on 24-h UNa and no significant effect on 24-h ABPM.
    Type of Medium: Online Resource
    ISSN: 0931-0509 , 1460-2385
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2021
    detail.hit.zdb_id: 1465709-0
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  • 6
    In: Journal of the American Society of Nephrology, Ovid Technologies (Wolters Kluwer Health), Vol. 28, No. 4 ( 2017-4), p. 1259-1268
    Abstract: Previous studies have suggested the benefits of physical exercise for patients on dialysis. We conducted the Exercise Introduction to Enhance Performance in Dialysis trial, a 6-month randomized, multicenter trial to test whether a simple, personalized walking exercise program at home, managed by dialysis staff, improves functional status in adult patients on dialysis. The main study outcomes included change in physical performance at 6 months, assessed by the 6-minute walking test and the five times sit-to-stand test, and in quality of life, assessed by the Kidney Disease Quality of Life Short Form (KDQOL-SF) questionnaire. We randomized 296 patients to normal physical activity (control; n =145) or walking exercise ( n =151); 227 patients (exercise n =104; control n =123) repeated the 6-month evaluations. The distance covered during the 6-minute walking test improved in the exercise group (mean distance±SD: baseline, 328±96 m; 6 months, 367±113 m) but not in the control group (baseline, 321±107 m; 6 months, 324±116 m; P 〈 0.001 between groups). Similarly, the five times sit-to-stand test time improved in the exercise group (mean time±SD: baseline, 20.5±6.0 seconds; 6 months, 18.2±5.7 seconds) but not in the control group (baseline, 20.9±5.8 seconds; 6 months, 20.2±6.4 seconds; P =0.001 between groups). The cognitive function score ( P =0.04) and quality of social interaction score ( P =0.01) in the kidney disease component of the KDQOL-SF improved significantly in the exercise arm compared with the control arm. Hence, a simple, personalized, home-based, low-intensity exercise program managed by dialysis staff may improve physical performance and quality of life in patients on dialysis.
    Type of Medium: Online Resource
    ISSN: 1046-6673 , 1533-3450
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2017
    detail.hit.zdb_id: 2029124-3
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  • 7
    In: Kidney and Blood Pressure Research, S. Karger AG, Vol. 39, No. 2-3 ( 2014), p. 197-204
    Abstract: 〈 b 〉 〈 i 〉 Background/Aims: 〈 /i 〉 〈 /b 〉 In this corollary analysis of the EXCITE study, we looked at possible differences in baseline risk factors and mortality between subjects excluded from the trial because non-eligible (n=216) or because eligible but refusing to participate (n=116). 〈 b 〉 〈 i 〉 Methods: 〈 /i 〉 〈 /b 〉 Baseline characteristics and mortality data were recorded. Survival and independent predictors of mortality were assessed by Kaplan-Meier and Cox regression analyses. 〈 b 〉 〈 i 〉 Results: 〈 /i 〉 〈 /b 〉 The incidence rate of mortality was higher in non-eligible vs. eligible non-randomized patients (21.0 vs. 10.9 deaths/100 persons-year; P 〈 0.001). The crude excess risk of death in non-eligible patients (HR 1.96; 95% CI 1.36 to 2.77; P 〈 0.001) was reduced after adjustment for risk factors which differed in the two cohorts including age, blood pressure, phosphate, CRP, smoking, diabetes, triglycerides, cardiovascular comorbidities and history of neoplasia (HR 1.60; 95% CI 1.10 to 2.35; P=0.017) and almost nullified after including in the same model also information on deambulation impairment (HR 1.16; 95% CI 0.75 to 1.80; P=0.513). 〈 b 〉 〈 i 〉 Conclusions: 〈 /i 〉 〈 /b 〉 Deambulation ability mostly explains the difference in survival rate in non-eligible and eligible non-randomized patients in the EXCITE trial. Extending data analyses and outcome reporting also to subjects not taking part in a trial may be helpful to assess the representability of the study population.
    Type of Medium: Online Resource
    ISSN: 1420-4096 , 1423-0143
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2014
    detail.hit.zdb_id: 1482922-8
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  • 8
    In: Cardiovascular Diabetology, Springer Science and Business Media LLC, Vol. 19, No. 1 ( 2020-12)
    Abstract: Ferritin, a crucial element for iron homeostasis, is associated with chronic diseases characterized by subclinical inflammation such as essential arterial hypertension and type 2 diabetes mellitus (T2DM), showing a prognostic value in different clinical settings. We investigated whether ferritin is associated with arterial stiffness (AS), an early indicator of atherosclerosis, and if it could act as effect modifier on the relationship between inflammation and AS in hypertensive patients with different glucose tolerance. Methods We enrolled 462 newly diagnosed untreated hypertensive (HT) patients. All subjects underwent an oral glucose tolerance test. Insulin sensitivity was assessed by MATSUDA index and ferritin levels were estimated by immunoradiometric assay. AS was defined by carotid-femoral pulse wave velocity (PWV). Results Out of 462 patients, 271 showed normal glucose tolerance (HT/NGT), 146 impaired glucose tolerance (HT/IGT) and 45 were diabetic (HT/T2DM). Iron levels significantly decreased and transferrin and ferritin significantly increased from the first to the third group. PWV values were significantly higher in HT/IGT and HT/T2DM patients. PWV was related directly with ferritin, high sensitivity C reactive protein (hs-CRP), transferrin, and inversely with MATSUDA index. Ferritin resulted the strongest determinant of PWV explaining a 14.9% of its variation; moreover it was a strong modifier of the relationship between hs-CRP and PWV. The estimated augmentation in PWV portended by a fixed increase in hs-CRP, was higher across increasing values of ferritin. Conclusion Ferritin represents an independent risk factor of arterial stiffness in our study population and a strong effect modifier on the relationship between inflammation and PWV. However, further studies are needed to fully elucidate the potential role of this biomarker in human atherosclerosis.
    Type of Medium: Online Resource
    ISSN: 1475-2840
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 2093769-6
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  • 9
    Online Resource
    Online Resource
    Oxford University Press (OUP) ; 2021
    In:  Nephrology Dialysis Transplantation Vol. 36, No. 4 ( 2021-03-29), p. 665-672
    In: Nephrology Dialysis Transplantation, Oxford University Press (OUP), Vol. 36, No. 4 ( 2021-03-29), p. 665-672
    Abstract: Left ventricular hypertrophy is causally implicated in the high risk of death and heart failure (HF) in chronic kidney disease (CKD) patients. Whether the left ventricular mass index (LVMI) adds meaningful predictive power for mortality and de novo HF to simple risk models has not been tested in the CKD population. Methods We investigated this problem in 1352 CKD patients enrolled in the Chronic Renal Insufficiency Cohort (CRIC). LVMI was measured by echocardiography and the risks for death and HF were estimated by the Study of Heart and Renal Protection (SHARP) score, a well-validated risk score in CKD patients. Results During a median follow-up of 7.7 years, 326 patients died and 208 had de novo HF. The LVMI and the SHARP score and a cross-validated model for HF (CRIC model) were all significantly (P  & lt; 0.001) related to the risk of death and HF. LVMI showed a discriminatory power for death (Harrell’s C index 66%) inferior to that of the SHARP score (71%) and the same was true for the risk of HF both in the test (LVMI 72%, CRIC model 79%) and in the validation cohort (LVMI 71%, CRIC model 74%). LVMI increased very little the discriminatory (2–3%) and the risk reclassification power (3.0–4.8%) by the SHARP score and the CRIC model for HF for the same outcomes. Conclusions In CKD, measurement of LVMI solely for the stratification of risk of death and perhaps for the risk of HF does not provide evident prognostic values in this condition.
    Type of Medium: Online Resource
    ISSN: 0931-0509 , 1460-2385
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2021
    detail.hit.zdb_id: 1465709-0
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  • 10
    In: Nephrology Dialysis Transplantation, Oxford University Press (OUP), Vol. 35, No. Supplement_3 ( 2020-06-01)
    Abstract: Acute kidney injury (AKI) is one of the most serious complications of patients admitted to intensive care units (ICUs). It is associated with high short- and long-term mortality and resource utilization. The definition of AKI has been established by the KDIGO guidelines based on changes in serum creatinine, urine output or both. However, in clinical practice physicians may ignore the standard criteria and rely on clinical judgement. We therefore aimed to assess the degree of physicians’ compliance with the KDIGO guidelines in diagnosis of AKI. Method We collected data (demographic, clinical, and biochemical) in a multicenter prospective cohort study from all adults admitted to ICUs (10 surgical and 8 medical) units at Alexandria University Teaching Hospitals from February 1st, 2016 till August 1st, 2016. Alexandria Teaching Hospitals cover four governorates of Northern Egypt and serve approximately 14 million people. Doctors were preliminarily instructed to apply KDIGO criteria for the diagnosis of AKI. Personal and clinical experience data were collected from the treating physicians. We followed patients for thirty days from study entry until discharge, death or study end. Written informed consent was obtained from all participants. AKI was defined and classified based on KDIGO 2012 criteria. In parallel, we registered the actual clinical diagnosis made by the treating physicians. We used frequencies and means for qualitative and quantitative variables as appropriate. Results The study included 532 patients who were on average 46 year old (±18), 41.7% were males, 23.5% with smoking, 23.1% had diabetes, 34.8%, were hypertensive, 11.3 % with pre-existing chronic kidney disease, and 30.1% had cardiovascular diseases. There were 140 physicians responsible for treating the enrolled subjects, with mean age 30 ±3 years, 57% were males, 20% were nephrologists, and the median years of experience was 3 years (inter-quartile range: 2-4years). The AKI incidence was 62.2% according to KDIGO criteria versus 49.9% based on the clinical diagnosis of treating physicians. Among those not reported to have AKI by the treating physicians; 19.1% were in stage 1, 26.4% in stage 2, and 12.9% in stage 3 AKI based on KDIGO. About 24% of patients who had AKI at ICU admission and 15% of those who developed AKI after ICU admission were not appropriately identified as AKI patients according to the physicians. There was a significant association between the physician speciality (nephrology vs other specialties) and the correct AKI diagnosis based on KDIGO criteria (X2=47.06, p & lt;0.001). Conclusion To streamline a correct and timely identification of AKI, treating physicians in ICUs at a large hospital in North Africa, like the Alexandria University Teaching Hospitals in Egypt, need well focused training and knowledge verification post training on KDIGO guidelines for identifying AKI patients. Implementation of electronic alerts could help in proper diagnosis and management.
    Type of Medium: Online Resource
    ISSN: 0931-0509 , 1460-2385
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2020
    detail.hit.zdb_id: 1465709-0
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