How to Reduce the Risk of Arteriovenous Fistula Dysfunction by Observing Prepump Arterial Pressure during Hemodialysis: A Multicenter Retrospective Study

2021 ◽  
pp. 1-8
Author(s):  
Chun-Yan Sun ◽  
Li-Fang Zhou ◽  
Li Song ◽  
Li-Juan Lan ◽  
Xiao-Wei Han ◽  
...  
Keyword(s):  
Arteriovenous Fistula ◽  
Proportional Hazards ◽  
Reference Value ◽  
Cox Proportional Hazards ◽  
Blood Pump ◽  
Proportional Hazards Regression ◽  
Hazard Ratios ◽  
Ratio Set ◽  
Restricted Cubic Splines ◽  
The Impact

<b><i>Objective:</i></b> Prepump arterial (Pa) pressure indicates the ease or difficulty with which the blood pump can draw blood from the vascular access (VA) during hemodialysis. Some studies have suggested that the absolute value of the Pa pressure to the extracorporeal blood pump flow (Qb) ratio set on the machine (|Pa/Qb|) can reflect the dysfunction of VA. This study was conducted to explore the impact of arteriovenous fistula (AVF) dysfunction and to explore the clinical reference value of |Pa/Qb|. <b><i>Methods:</i></b> We retrospectively identified adults who underwent hemodialysis at 3 hospitals. Data were acquired from electronic health records. We evaluated the pattern of the association between |Pa/Qb| and AVF dysfunction during 1 year using a Cox proportional hazards regression model with restricted cubic splines. Then, the patients were grouped based on the results, and hazard ratios were compared for different intervals of |Pa/Qb|. <b><i>Results:</i></b> A total of 490 patients were analyzed, with an average age of 55 (44, 66) years. There were a total of 85 cases of AVF dysfunction, of which 50 cases were stenosis and 35 cases were thrombosis. There was a U-shaped association between |Pa/Qb| and the risk of AVF dysfunction (<i>p</i> for nonlinearity &#x3c;0.001). |Pa/Qb| values &#x3c;0.30 and &#x3e;0.52 increased the risk of AVF dysfunction. Compared with the group with a |Pa/Qb| value between 0.30 and 0.52, the groups with |Pa/Qb| &#x3c;0.30 and |Pa/Qb| &#x3e;0.52 had a 4.04-fold (<i>p</i> = 0.002) and 3.41-fold (<i>p</i> &#x3c; 0.001) greater risk of AVF dysfunction, respectively. <b><i>Conclusions:</i></b> The appropriate range of |Pa/Qb| is between 0.30 and 0.52. When |Pa/Qb| is &#x3c;0.30 or &#x3e;0.52, the patient’s AVF function or Qb setting should be reevaluated to prevent subsequent failure.

scholarly journals Sex-Specific Associations between Blood Pressure and Risk of Atrial Fibrillation Subtypes in the Tromsø Study

2021 ◽  
Vol 10 (7) ◽  
pp. 1514
Author(s):  
Hilde Espnes ◽  
Jocasta Ball ◽  
Maja-Lisa Løchen ◽  
Tom Wilsgaard ◽  
Inger Njølstad ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Blood Pressure ◽  
Proportional Hazards ◽  
Cox Proportional Hazards ◽  
Pressure Management ◽  
Reference Models ◽  
Proportional Hazards Regression ◽  
Hazard Ratios ◽  
Increased Risk

The aim of this study was to explore sex-specific associations between systolic blood pressure (SBP), hypertension, and the risk of incident atrial fibrillation (AF) subtypes, including paroxysmal, persistent, and permanent AF, in a general population. A total of 13,137 women and 11,667 men who participated in the fourth survey of the Tromsø Study (1994–1995) were followed up for incident AF until the end of 2016. Cox proportional hazards regression analysis was conducted using fractional polynomials for SBP to provide sex- and AF-subtype-specific hazard ratios (HRs) for SBP. An SBP of 120 mmHg was used as the reference. Models were adjusted for other cardiovascular risk factors. Over a mean follow-up of 17.6 ± 6.6 years, incident AF occurred in 914 (7.0%) women (501 with paroxysmal/persistent AF and 413 with permanent AF) and 1104 (9.5%) men (606 with paroxysmal/persistent AF and 498 with permanent AF). In women, an SBP of 180 mmHg was associated with an HR of 2.10 (95% confidence interval [CI] 1.60–2.76) for paroxysmal/persistent AF and an HR of 1.80 (95% CI 1.33–2.44) for permanent AF. In men, an SBP of 180 mmHg was associated with an HR of 1.90 (95% CI 1.46–2.46) for paroxysmal/persistent AF, while there was no association with the risk of permanent AF. In conclusion, increasing SBP was associated with an increased risk of both paroxysmal/persistent AF and permanent AF in women, but only paroxysmal/persistent AF in men. Our findings highlight the importance of sex-specific risk stratification and optimizing blood pressure management for the prevention of AF subtypes in clinical practice.

The Efficacy of Etoposide-Based Therapy in Adult Secondary Hemophagocytic Lymphohistiocytosis

2021 ◽  
pp. 1-9
Author(s):  
Leonard Naymagon ◽  
Douglas Tremblay ◽  
John Mascarenhas
Keyword(s):  
Hemophagocytic Lymphohistiocytosis ◽  
Proportional Hazards ◽  
Multivariable Analysis ◽  
Cox Proportional Hazards ◽  
Rank Test ◽  
Kaplan Meier ◽  
Hazard Ratios ◽  
Significant Difference ◽  
The Impact

Data supporting the use of etoposide-based therapy in hemophagocytic lymphohistiocytosis (HLH) arise largely from pediatric studies. There is a lack of comparable data among adult patients with secondary HLH. We conducted a retrospective study to assess the impact of etoposide-based therapy on outcomes in adult secondary HLH. The primary outcome was overall survival. The log-rank test was used to compare Kaplan-Meier distributions of time-to-event outcomes. Multivariable Cox proportional hazards modeling was used to estimate adjusted hazard ratios (HRs) with 95% confidence intervals (CIs). Ninety adults with secondary HLH seen between January 1, 2009, and January 6, 2020, were included. Forty-two patients (47%) received etoposide-based therapy, while 48 (53%) received treatment only for their inciting proinflammatory condition. Thirty-three patients in the etoposide group (72%) and 32 in the no-etoposide group (67%) died during follow-up. Median survival in the etoposide and no-etoposide groups was 1.04 and 1.39 months, respectively. There was no significant difference in survival between the etoposide and no-etoposide groups (log-rank <i>p</i> = 0.4146). On multivariable analysis, there was no association between treatment with etoposide and survival (HR for death with etoposide = 1.067, 95% CI: 0.633–1.799, <i>p</i> = 0.8084). Use of etoposide-based therapy was not associated with improvement in outcomes in this large cohort of adult secondary HLH patients.

Consumption of flavonoid-rich fruits, flavonoids from fruits, and stroke risk: a prospective cohort study

2021 ◽  
pp. 1-26
Author(s):  
Qi Gao ◽  
Jia-Yi Dong ◽  
Renzhe Cui ◽  
Isao Muraki ◽  
Kazumasa Yamagishi ◽  
...  
Keyword(s):  
Lower Risk ◽  
Stroke Risk ◽  
Proportional Hazards ◽  
Cox Proportional Hazards ◽  
Dietary Factors ◽  
Citrus Fruits ◽  
Proportional Hazards Regression ◽  
Hazard Ratios ◽  
Index Study

Abstract We sought to examine the prospective associations of specific fruit consumption, in particular flavonoid-rich fruit (FRF) consumption, with the risk of stroke and subtypes of stroke in a Japanese population. A study followed a total of 39,843 men and 47,334 women aged 44-76 years, and free of cardiovascular disease, diabetes, and cancer at baseline since 1995 and 1998 to the end of 2009 and 2012, respectively. Data on total and specific FRF consumption for each participant were obtained using a self-administrated food frequency questionnaire. The hazard ratios (HRs) of stroke in relation to total and specific FRF consumption were estimated through Cox proportional hazards regression models. During a median follow-up of 13.1 years, 4092 incident stroke cases (2557 cerebral infarctions and 1516 hemorrhagic strokes) were documented. After adjustment for age, body mass index, study area, lifestyles, dietary factors, and other risk factors, it was found that total FRF consumption was associated with a significantly lower risk of stroke in women (HR= 0.70; 95% CI, 0.58-0.84), while the association in men was not significant (HR= 0.93; 95% CI, 0.79-1.09). As for specific FRFs, consumptions of citrus fruits, strawberries, and grapes were found associated with a lower stroke risk in women. Higher consumptions of FRFs, in particular citrus fruits, strawberries, and grapes, were associated with a lower risk of developing stroke in Japanese women.

scholarly journals Effect on Survival of Longer Intervals Between Confirmed Diagnosis and Treatment Initiation Among Low-Income Women With Breast Cancer

2012 ◽  
Vol 30 (36) ◽  
pp. 4493-4500 ◽  
Author(s):  
John M. McLaughlin ◽  
Roger T. Anderson ◽  
Amy K. Ferketich ◽  
Eric E. Seiber ◽  
Rajesh Balkrishnan ◽  
...  
Keyword(s):  
Breast Cancer ◽  
North Carolina ◽  
Low Income ◽  
Late Stage ◽  
Proportional Hazards ◽  
Treatment Initiation ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Regression ◽  
Proportional Hazards Regression ◽  
The Impact

Purpose To determine the impact of longer periods between biopsy-confirmed breast cancer diagnosis and the initiation of treatment (Dx2Tx) on survival. Patients and Methods This study was a noninterventional, retrospective analysis of adult female North Carolina Medicaid enrollees diagnosed with breast cancer from January 1, 2000, through December, 31, 2002, in the linked North Carolina Central Cancer Registry–Medicaid Claims database. Follow-up data were available through July 31, 2006. Cox proportional hazards regression models were constructed to evaluate the impact on survival of delaying treatment ≥ 60 days after a confirmed diagnosis of breast cancer. Results The study cohort consisted of 1,786 low-income, adult women with a mean age of 61.6 years. A large proportion of the patients (44.3%) were racial minorities. Median time from biopsy-confirmed diagnosis to treatment initiation was 22 days. Adjusted Cox proportional hazards regression showed that although Dx2Tx length did not affect survival among those diagnosed at early stage, among late-stage patients, intervals between diagnosis and first treatment ≥ 60 days were associated with significantly worse overall survival (hazard ratio [HR], 1.66; 95% CI, 1.00 to 2.77; P = .05) and breast cancer–specific survival (HR, 1.85; 95% CI, 1.04 to 3.27; P = .04). Conclusion One in 10 women waited ≥ 60 days to initiate treatment after a diagnosis of breast cancer. Waiting ≥ 60 days to initiate treatment was associated with a significant 66% and 85% increased risk of overall and breast cancer–related death, respectively, among late-stage patients. Interventions designed to increase the timeliness of receiving breast cancer treatments should target late-stage patients, and clinicians should strive to promptly triage and initiate treatment for patients diagnosed at late stage.

scholarly journals Twinning and Risk of Stillbirth Subtypes in Pediatric Mothers

2006 ◽  
Vol 9 (5) ◽  
pp. 673-676 ◽  
Author(s):  
Hamisu M. Salihu ◽  
Puza P. Sharma ◽  
Shillena Peters
Keyword(s):  
Adolescent Mothers ◽  
Proportional Hazards ◽  
Single Case ◽  
The United States ◽  
Cox Proportional Hazards ◽  
Adjusted Risk ◽  
Proportional Hazards Regression ◽  
Hazard Ratios ◽  
Comparison Groups ◽  
Twin Pregnancies

AbstractWe sought to estimate levels of risk for stillbirth subtypes associated with twin gestations among pediatric mothers (10–14 years). Analysis was on twin pregnancies covering the period 1989 to 2000 in the United States. We classified stillbirth as term, preterm, small-for-gestational-age (SGA) or preterm-SGA. We then assessed the risks of these stillbirth subtypes in pediatric mothers using two comparison groups consisting of women aged 15 to 19 years old (adolescent mothers) and 20 to 24 years old (mature mothers). Adjusted risk estimates were by means of hazard ratios generated from a Cox proportional hazards regression model. We adjusted for dependence of observations within twin clusters using the robust sandwich estimator. The rate of stillbirth was highest among pediatric mothers (56/1000), followed by adolescent gravidas (29/1000) and lowest in mature mothers (20/1000; p for trend < .01). Overall, preterm stillbirth was the most frequent stillbirth phenotype while term stillbirth was the least frequent. Not a single case of term stillbirth was recorded in pediatric mothers. Among pediatric gravidas, the risk for preterm stillbirth was more than tripled (adjusted hazard ratio [AHR] = 3.4; 95% confidence interval [CI] = 2.5–4.6), and that of preterm-SGA stillbirth more than doubled (AHR = 2.6; 95% CI = 1.8–3.7) that of mature mothers respectively. The 30% risk elevation for SGA stillbirth among pediatric mothers was not found to be statistically significant (AHR = 1.1; 95% CI = 0.3–4.3). Pediatric motherhood is a risk factor for stillbirth in twin gestation, especially, preterm and preterm-SGA stillbirth phenotypes. Prevention of stillbirth among this category of mothers should target the period preceding full term.

scholarly journals Risk factors for dementia onset in older adults with metastatic renal cell carcinoma

2021 ◽  
Vol 5 (Supplement_1) ◽  
pp. 701-702
Author(s):  
Samuel Miller ◽  
Lauren Wilson ◽  
Melissa Greiner ◽  
Jessica Pritchard ◽  
Tian Zhang ◽  
...  
Keyword(s):  
Older Adults ◽  
Renal Cell Carcinoma ◽  
Cell Carcinoma ◽  
Metastatic Renal Cell Carcinoma ◽  
Renal Cell ◽  
Proportional Hazards ◽  
Cox Proportional Hazards ◽  
Cox Proportional Hazards Regression ◽  
Proportional Hazards Regression ◽  
The Impact

Abstract Renal dysfunction is a driver of dementia. It is also associated with renal cell carcinoma, possibly the result of the tumor itself or from cancer treatment. This study evaluates metastatic renal cell carcinoma (mRCC) as a risk factor for developing mild cognitive impairment or dementia (MCI/D) as well as the impact of RCC-directed therapies on the development of MCI/D. We identified all patients diagnosed with mRCC in SEER-Medicare from 2007-2015. The main outcome was incident MCI/D within one year of mRCC diagnosis or cohort entry. Exclusion criteria included age &lt;65 at mRCC diagnosis and diagnosis of MCI/D within preceding year of mRCC diagnosis. Patients with mRCC (n=2,533) were matched to non-cancer controls (n=7,027) on age, sex, race, comorbidities and year. Cox proportional hazards regression showed that having mRCC (HR 8.52, 95% MCI/D 6.49-11.18, p&lt;0.001) and being older (HR 1.05 for 1-year age increase, 95% MCI/D 1.03-1.07, p&lt;0.001) were predictive of developing MCI/D. A second Cox proportional hazards regression of only patients with mRCC revealed that neither those initiating treatment with oral anticancer agents (OAAs) nor those who underwent nephrectomy were more likely to develop MCI/D. Black patients had a higher risk of dementia compared to white patients (HR 1.92, 95% MCI/D 1.02-3.59, p=0.047). In conclusion, patients with mRCC were more likely to develop MCI/D than those without mRCC. The medical and surgical therapies evaluated were not associated with increased incidence of MCI/D. The increased incidence of MCI/D in older adults with mRCC may be the result of the pathology itself.

scholarly journals Disability and the risk of subsequent mortality in elderly: a 12-year longitudinal population-based study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yang Yang ◽  
Zhaohui Du ◽  
Yafei Liu ◽  
Jiahui Lao ◽  
Xiaoru Sun ◽  
...  
Keyword(s):  
Mortality Rate ◽  
Proportional Hazards ◽  
Survey Design ◽  
Age Groups ◽  
The Elderly ◽  
Cox Proportional Hazards ◽  
Cumulative Mortality ◽  
Hazard Ratios ◽  
The Impact ◽  
Young Old

Abstract Background Assessment the impact of disability on mortality among the elderly is vital to healthy ageing. The present study aimed to assess the long-term influence of disability on death in the elderly based on a longitudinal study. Method This study used the Chinese Longitudinal Healthy Longevity Study (CLHLS) data from 2002 to 2014, including 13,666 participants aged 65 years and older in analyses. The Katz ADL index was used to assess disability status and levels. Cumulative mortality rates were estimated by the Kaplan-Meier method. Cox proportional hazards models were conducted to estimate associations between disability and all-cause mortality for overall participants, two age groups as well as specific chronic disease groups. All reported results were adjusted by survey weights to account for the complex survey design. Results During the 12-year follow-up, the death density was 6.01 per 100 person-years. The 3-years’ cumulative mortality rate of nondisabled elderly was 11.9% (95%CI: 10.9, 12.9%). As the level of disability increased, the cumulative mortality rate was from 28.1% (95%CI: 23.0, 33.1%) to 77.6% (95%CI: 63.8, 91.4%). Compared with non-disabled elderly, the multiple-adjusted hazard ratio of death due to disability was 1.68 (95% CI: 1.48, 1.90). The hazard ratios varied from 1.44 (95%CI: 1.23, 1.67) to 4.45 (95%CI: 2.69, 7.38) after classifying the disability levels. The hazard ratios of death in the young-old group (65–79 years) were higher than the old-old group (80 years and over) in both level B (HR = 1.58, 95%CI: 1.25, 2.00 vs. HR = 1.22, 95%CI: 1.06, 1.39, P = 0.029) and level G (HR = 24.09, 95%CI: 10.83, 53.60 vs. HR = 2.56, 95%CI: 1.75, 3.74, P < 0.001). For patients with hypertension, diabetes, heart disease, cerebrovascular disease as well as dementia, disability increases their relative risk of mortality by 1.64 (95%CI: 1.40, 1.93), 2.85 (95%CI: 1.46, 5.58), 1.45 (95%CI: 1.02, 2.05), 2.13 (95%CI: 1.54, 2.93) and 3.56 (95%CI: 1.22, 10.38) times, respectively. Conclusions Disability increases the risk of all-cause death in the elderly, especially those with chronic diseases and the young-old group. Further studies are needed to better understand how to effectively prevent disability in the older population.

SimTube: A National Simulation Training and Research Project

2020 ◽  
Vol 163 (3) ◽  
pp. 522-530
Author(s):  
Gregory J. Wiet ◽  
Ellen S. Deutsch ◽  
Sonya Malekzadeh ◽  
Amanda J. Onwuka ◽  
Nathan W. Callender ◽  
...  
Keyword(s):  
Simulation Training ◽  
Proportional Hazards ◽  
Intervention Group ◽  
Cox Proportional Hazards ◽  
Proportional Hazards Regression ◽  
P 16 ◽  
Training And Research ◽  
Live Surgery ◽  
And Control ◽  
The Impact

Objective To test the feasibility and impact of a simulation training program for myringotomy and tube (M&T) placement. Study Design Prospective randomized controlled. Setting Multi-institutional. Subjects and Methods An M&T simulator was used to assess the impact of simulation training vs no simulation training on the rate of achieving competency. Novice trainees were assessed using posttest simulator Objective Structured Assessment of Technical Skills (OSATS) scores, OSATS score for initial intraoperative tube insertion, and number of procedures to obtain competency. The effect of simulation training was analyzed using χ2 tests, Wilcoxon-Mann-Whitney tests, and Cox proportional hazards regression. Results A total of 101 residents and 105 raters from 65 institutions were enrolled; however, just 63 residents had sufficient data to be analyzed due to substantial breaches in protocol. There was no difference in simulator pretest scores between intervention and control groups; however, the intervention group had better OSATS global scores on the simulator (17.4 vs 13.7, P = .0003) and OSATS task scores on the simulator (4.5 vs 3.6, P = .02). No difference in OSATS scores was observed during initial live surgery rating ( P = .73 and P = .41). OSATS scores were predictive of the rate at which residents achieved competence in performing myringotomy; however, the intervention was not associated with subsequent OSATS scores during live surgeries ( P = .44 and P = .91) or the rate of achieving competence ( P = .16). Conclusions A multi-institutional simulation study is feasible. Novices trained using the M&T simulator achieved higher scores on simulator but not initial intraoperative OSATS, and they did not reach competency sooner than those not trained on the simulator.

Long-Term Exposure to Ambient Hydrocarbons Increases Dementia Risk in People Aged 50 Years and above in Taiwan

2020 ◽  
Vol 16 (14) ◽  
pp. 1276-1289
Author(s):  
Han-Wei Zhang ◽  
Victor C. Kok ◽  
Shu-Chun Chuang ◽  
Chun-Hung Tseng ◽  
Chin-Teng Lin ◽  
...  
Keyword(s):  
Air Pollutants ◽  
Proportional Hazards ◽  
The Elderly ◽  
Cox Proportional Hazards ◽  
Proportional Hazards Regression ◽  
Hazard Ratios ◽  
Dementia Risk ◽  
Disease Exposure ◽  
Total Hydrocarbons

Background: Alzheimer’s disease, the most common cause of dementia among the elderly, is a progressive and irreversible neurodegenerative disease. Exposure to air pollutants is known to have adverse effects on human health, however, little is known about hydrocarbons in the air that can trigger a dementia event. Objective: We aimed to investigate whether long-term exposure to airborne hydrocarbons increases the risk of developing dementia. Method: The present cohort study included 178,085 people aged 50 years and older in Taiwan. Cox proportional hazards regression analysis was used to fit the multiple pollutant models for two targeted pollutants, including total hydrocarbons and non-methane hydrocarbons, and estimated the risk of dementia. Results: Before controlling for multiple pollutants, hazard ratios with 95% confidence intervals for the overall population were 7.63 (7.28-7.99, p <0.001) at a 0.51-ppm increases in total hydrocarbons, and 2.94 (2.82-3.05, p <0.001) at a 0.32-ppm increases in non-methane hydrocarbons. The highest adjusted hazard ratios for different multiple-pollutant models of each targeted pollutant were statistically significant (p <0.001) for all patients: 11.52 (10.86-12.24) for total hydrocarbons and 9.73 (9.18-10.32) for non-methane hydrocarbons. Conclusion: Our findings suggest that total hydrocarbons and non-methane hydrocarbons may be contributing to dementia development.

scholarly journals 558 PREVALENCE AND IMPACT OF FRAILTY IN PATIENTS HOSPITALISED WITH COVID-19. THE SALFORD EXPERIENCE IN WAVES 1 AND 2

2021 ◽  
Vol 50 (Supplement_2) ◽  
pp. ii14-ii18
Author(s):  
A Khan ◽  
F R Espinoza ◽  
T Kneen ◽  
A Dafnis ◽  
H Allafi ◽  
...  
Keyword(s):  
Prospective Observational Study ◽  
Proportional Hazards ◽  
Hospital Admissions ◽  
Cox Proportional Hazards ◽  
Vulnerable Group ◽  
Clinical Frailty Scale ◽  
Patient Demographics ◽  
Cox Proportional Hazards Regression ◽  
Proportional Hazards Regression ◽  
The Impact

Abstract Introduction The COVID-19 pandemic has had an extensive impact on the frail older population, with significant rates of COVID-related hospital admissions and deaths amongst this vulnerable group. There is little evidence of frailty prevalence amongst patients hospitalised with COVID-19, nor the impact of frailty on their survival. Methods Prospective observational study of all consecutive patients admitted to Salford Royal NHS Foundation (SRFT) Trust between 27th February and 28th April 2020 (wave 1), and 1st October to 10th November 2020 (wave 2) with a diagnosis of COVID-19. The primary endpoint was in-hospital mortality. Patient demographics, co-morbidities, admission level disease severity (estimated with CRP) and frailty (using the Clinical Frailty Scale, score 1–3 = not frail, score 4–9 = frail) were collected. A Cox proportional hazards regression model was used to assess the time to mortality. Results A total of 693 (N = 429, wave 1; N = 264, wave 2) patients were included, 279 (N = 180, 42%, wave 1; N = 104, 38%, wave 2) were female, and the median age was 72 in wave 1 and 73 in wave 2. 318 (N = 212, 49%, wave 1; N = 106, 39%, wave 2) patients presenting were frail. There was a reduction in mortality in wave 2, adjusted Hazard ratio (aHR) = 0.60 (95%CI 0.44–0.81; p = 0.001). There was an association between frailty and mortality aHR = 1.57 (95%CI 1.09–2.26; p = 0.015). Conclusion Frailty is highly prevalent amongst patients of all ages admitted to SRFT with COVID-19. Higher scores of frailty are associated with increased mortality.

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