Prognostic information provided by serial measurements of brain natriuretic peptide in heart failure

The Association between Serially Measured Circulating Biomarker Patterns and Pulmonary Artery Pressures measured by Invasive Hemodynamic Monitoring

AIMS

Invasive hemodynamic monitoring devices provide relevant insights into the remote hemodynamic status of heart failure (HF) patients. Additionally, circulating biomarkers have been advocated as additive in HF management by offering prognostic information and therapeutic targets. However, limited data exist correlating serially measured biomarkers to hemodynamic pressures provided by invasive sensors. This study aims to investigate the association between serial biomarker patterns and pulmonary artery (PA) pressure dynamics in HF patients.

METHODS AND RESULTS

This study is a sub study of the MONITOR-HF trial (NTR7673), a prospective investigator-initiated multicenter randomized clinical trial conducted in chronic HF (CHF) patients. Blood samples were collected at baseline and 3, 6 and 12 months follow up, and 92 proteins (OLINK CV-III panel) were measured. The primary endpoint was the average mean PA pressure (mPAP) during the week preceding blood sample collection, in patients who received an invasive PA pressure sensor. Linear mixed models were used to evaluate the association between serial biomarker levels and mPAP, adjusting for sex and age, and correcting for multiple testing. This study included 165 patients who had a median age of 68 [IQR 61 - 75] years and were predominantly male (78%). Fifteen biomarkers were significantly associated with the 7-day average mPAP, with thirteen biomarkers maintaining consistent associations across different lag-times. The strongest associations were found between mPAP and N-terminal pro b-type natriuretic peptide (NT-proBNP), pulmonary surfactant protein D (PSP-D), insulin like growth factor binding protein 7 (IGFBP-7) and matrix metalloproteinase-2 (MMP-2).

CONCLUSION

We found a consistent association between invasive hemodynamic pressures and thirteen serially measured blood biomarkers in CHF patients. These results, which use unique information obtained from PA pressure sensors, could deepen the understanding and therapy guidance of congestive HF.

Acute on chronic heart failure-Which variations on B-type natriuretic peptide levels?

OBJECTIVE

Natriuretic peptides are useful diagnostic and prognostic markers in patients presenting to the emergency department (ED) with acute shortness of breath. However, B-type natriuretic peptide (BNP) level represents a single snapshot in time, while changes relative to a patient's baseline may be useful in risk stratification. We aimed to define the variation of BNP levels between chronic stable and acute decompensated heart failure (ADHF) that is associated with significant clinical outcomes.

METHODS

We performed a retrospective cohort chart review study of chronic heart failure (HF) patients followed in an outpatient clinic from 2010 to 2013. Inclusion criteria were available hospital and clinic BNP levels and at least 1 year of follow-up care. ADHF was defined as a hospital admission for acute HF. Dry BNP was defined as its concentration after >3 months of optimal treatment and no variations in New York Heart Association class. Dry BNP was compared to the BNP at a subsequent ED visit that was associated with hospitalization because of ADHF.

RESULTS

Overall, 253 patients were included. Their median (interquartile range [IQR]) dry BNP was 191(83-450) pg/mL. There were 67 ADHF admissions, occurring 15 ± 15 months after patient's dry BNP was established. At subsequent ED admission, the median (IQR) BNP was 1505 (72-2620) pg/mL. Patients requiring inpatient admission had a BNP ∼250% higher than their stable BNP (404 vs 164 pg/mL, p < 0.001).

CONCLUSIONS

In this group of chronic stable HF patients, a doubling of BNP was observed in patients who required hospitalization for acute decompensated HF. BNP doubling may represent a useful parameter to reflect clinically relevant acute decompensated HF.

NT-proBNP and Echocardiographic Parameters in Patients with Acute Heart Failure

Aim. The aim of this study was to analyse the relation between clinical, haemodynamic and X-ray parameters and plasma NT-proBNP level in pts with symptoms of left ventricular dysfunction. Methods. The plasma NT-proBNP levels, chest x-ray, transthoracic 2-d and Doppler echocardiography were performed at the time of admission in a group of 96 consecutive patients (mean age 68 ± 11 years) with symptoms of acute heart failure. NT-proBNP levels were assessed with the use of commercial tests (Roche Diagnostics). Results. All patients have significant increase in NT-proBNP (8 000 ± 9 000 pg/mL vs. controls 90 ± 80 pg/mL, p < 0.001). The group of all patients has shown a significant increase in cardiothoracic ratio (CTR, 0.6 ± 0.1, vs. 0.4 ± 0.1, p <0.001), left atrium diameter (LAD, 4.4 ± 0.8 cm, vs.3.5 ± 0.4 cm, p <0.01). Left ventricular ejection fraction (LVEF) was decreased (37 ± 15%, vs. 64 ± 5%, p <0.001). In patients with acute heart failure, NT-proBNP significantly correlated with end-systolic and end-diastolic left ventricle diameters, ejection fraction, vena cava inferior diameter and plasma creatinine levels. Conclusion. Increased plasma NT-proBNP level is influenced by the clinical severity of acute heart failure and correlates with LVEF and IVCD. NT-proBNP can serve as a marker for the clinical severity of the disease.

Interpretation of B-type natriuretic peptides in the era of angiotensin receptor-neprilysin inhibitors

Assessment of serum levels of natriuretic peptides, especially the amino-terminal portion (NT-proBNP) and the carboxy-terminal portion (BNP) of pro-B-type natriuretic peptide, has had a highly significant clinical impact on the diagnosis and prognostic stratification of patients with heart failure (HF). They are now an instrument with recognized value in this context and several studies have demonstrated their value in tailoring therapy for these patients. Following the recent advent of angiotensin receptor-neprilysin inhibitors (ARNIs), there is a need to review how these two biomarkers are interpreted in HF. The use of ARNIs is associated with a reduction in NT-proBNP but an increase in BNP levels. The authors of this concise article review the interpretation of natriuretic peptide levels in the light of the most recent evidence.

Elevated admission N-terminal pro-brain natriuretic peptide level predicts the development of atrial fibrillation in general surgical intensive care unit patients

BACKGROUND

New onset atrial fibrillation (AF) in critically ill surgical patients is associated with significant morbidity and increased mortality. N-terminal pro-B type natriuretic peptide (NT-proBNP) is released by cardiomyocytes in response to stress and may predict AF development after surgery. We hypothesized that elevated NT-proBNP level at surgical intensive care unit (ICU) admission predicts AF development in a general surgical and trauma population.

METHODS

From July to October 2015, NT-proBNP concentrations were measured at ICU admission. Abnormal NT-proBNP concentrations were defined by age-adjusted cut-offs. We examined the relationship between the development of AF and demographics, clinical variables, and NT-proBNP level using univariate analysis and a multivariable logistic regression model.

RESULTS

Three hundred eighty-seven subjects were included in the cohort, none of whom were in AF at ICU admission. The median age was 63 years (52-73 years), and 40.3% were women. The risk of developing AF was higher for abnormal versus normal NT-proBNP (22% vs. 4%; p < 0.0001). Using optimal derived cutoffs (regardless of age), the risk of developing AF was 2% for NT-proBNP less than 600 ng/L, 15% for NT-proBNP of 600 ng/L to 1,999 ng/L, and 27% for NT-proBNP of 2,000 ng/L or greater. Multiple logistic regression analysis identified three independent predictors for new-onset AF: age, older than 70 years (odds ratio [OR], 3.7, 95% confidence interval [CI], 1.5-9.3), history of AF (OR, 25.3; 95% CI, 9.6-67.0), and NT-proBNP of 600 or greater (OR, 4.3; 95% CI, 1.3-14.2). When none or only one predictor was present, AF incidence was less than 1%. When all three predictors were present, AF incidence was 66%. For subjects 70 years or older but no history of AF, AF incidence was 12.8% when NT-proBNP was 600 or greater compared with 0% when NT-proBNP was less than 600. For subjects younger than 70 years with a history of AF, AF incidence was 44.4% when NT-proBNP was 600 or higher compared to 0% when NT-proBNP was less than 600.

CONCLUSION

Elevated NT-proBNP at ICU admission in general surgical and trauma patients is predictive of AF development in the first 3 ICU days. Addition of NT-proBNP measurement to known risk factors can improve predictive power and identify patients who might potentially benefit from evidence-based prophylactic treatment for AF.

Carotid Body Tumor Presenting as Parotid Swelling Misdiagnosed as Pleomorphic Adenoma: A Rare Presentation

Carotid body tumor (CBT) also known as chemodectoma is a rare tumor of neuroendocrine tissue of carotid body and is the most commonly seen jugular paraganglioma. In most cases, it is benign but it can be malignant. Extra adrenal paraganglioma is rare. We present such a rare case where unusual presentation of chemodectoma was seen as a parotid swelling. This swelling was misdiagnosed as a pleomorphic adenoma on clinical examination, ultrasonography, and fine-needle aspiration cytology and superficial parotidectomy was done for the same, but on histopathological examination it was found to be CBT presenting as a parotid swelling.

Do optimal prognostic thresholds in continuous physiological variables really exist? Analysis of origin of apparent thresholds, with systematic review for peak oxygen consumption, ejection fraction and BNP

Background

Clinicians are sometimes advised to make decisions using thresholds in measured variables, derived from prognostic studies.

Objectives

We studied why there are conflicting apparently-optimal prognostic thresholds, for example in exercise peak oxygen uptake (pVO₂), ejection fraction (EF), and Brain Natriuretic Peptide (BNP) in heart failure (HF).

Data Sources and Eligibility Criteria

Studies testing pVO₂, EF or BNP prognostic thresholds in heart failure, published between 1990 and 2010, listed on Pubmed.

Methods

First, we examined studies testing pVO₂, EF or BNP prognostic thresholds. Second, we created repeated simulations of 1500 patients to identify whether an apparently-optimal prognostic threshold indicates step change in risk.

Results

33 studies (8946 patients) tested a pVO₂ threshold. 18 found it prognostically significant: the actual reported threshold ranged widely (10–18 ml/kg/min) but was overwhelmingly controlled by the individual study population's mean pVO₂ (r = 0.86, p<0.00001). In contrast, the 15 negative publications were testing thresholds 199% further from their means (p = 0.0001). Likewise, of 35 EF studies (10220 patients), the thresholds in the 22 positive reports were strongly determined by study means (r = 0.90, p<0.0001). Similarly, in the 19 positives of 20 BNP studies (9725 patients): r = 0.86 (p<0.0001).

Second, survival simulations always discovered a “most significant” threshold, even when there was definitely no step change in mortality. With linear increase in risk, the apparently-optimal threshold was always near the sample mean (r = 0.99, p<0.001).

Limitations

This study cannot report the best threshold for any of these variables; instead it explains how common clinical research procedures routinely produce false thresholds.

Key Findings

First, shifting (and/or disappearance) of an apparently-optimal prognostic threshold is strongly determined by studies' average pVO₂, EF or BNP. Second, apparently-optimal thresholds always appear, even with no step in prognosis.

Conclusions

Emphatic therapeutic guidance based on thresholds from observational studies may be ill-founded. We should not assume that optimal thresholds, or any thresholds, exist.

NT-proANP and NT-proBNP as prognostic markers in patients with acute decompensated heart failure of different etiologies

BACKGROUND AND PURPOSE

Peak NT-proANP and NT-proBNP plasma levels after hospital admission may be of additional prognostic value in patients with acute decompensation of heart failure. The time-course of natriuretic plasma levels after hospital admission, and a possible influence of the underlying etiology on the time-course have not been sufficiently investigated.

METHODS AND RESULTS

Natriuretic peptide plasma levels of 85 patients with decompensated heart failure from ischemic and non-ischemic origins were measured at baseline and at 12h after hospital admission. NT-proBNP plasma levels on admission were lower compared to 12-hour-plasma levels, whereas NT-proANP plasma levels on admission were higher compared to 12-hour-plasma levels. Twenty-six patients (31%) died within the first 30 days. In patients who died within the first 30 days after admission NT-proANP and NT-proBNP plasma levels on admission and 12h later were significantly higher compared to survivors. Irrespective of different etiologies NT-proANP on admission and NT-proBNP 12h after admission were highest and demonstrated superior impact with respect to the prediction of 30-day-mortality.

CONCLUSIONS

NT-proANP and NT-proBNP are powerful markers of 30-day-mortality in patients with acute heart failure of ischemic and non-ischemic origins. With respect to the prediction of 30-day-mortality, NT-proBNP plasma levels at 12h after admission are comparable with NT-proANP plasma levels on admission. These data underline the fact that with regard to etiology-dependent hemodynamic changes and plasma half-time, the determination of peak plasma levels is of highest importance for the estimation of the impact of natriuretic peptides on the prognosis of patients with decompensated heart failure.

Diagnosis and surgical treatment of carotid body tumor: A report of 18 cases

OBJECTIVE

To summarize the experience in the diagnosis and treatment of carotid body tumor (CBT).

MATERIALS AND METHODS

CBT in 18 cases was confirmed by digital subtraction angiography (DSA). Resection of the tumor under the carotid adventitial plane was performed in 10 cases, the tumor with the external carotid artery in five cases, and the tumor with the internal and external arteries at the same time in three cases.

RESULTS

Neither death nor any major complications occurred in all the 18 cases. Our follow-up of the 18 patients revealed neither recurrence nor metastasis.

CONCLUSION

DSA is the gold standard for the diagnosis of CBT. After confirmation, thorough preoperative examination, sufficient preoperative preparation, and correct surgical approaches can result in satisfactory surgical effects.

Biomarkers of myocardial stress and systemic inflammation in patients who engage in heart failure self-care management

BACKGROUND

Self-care is believed to improve heart failure (HF) outcomes, but the mechanisms by which such improvement occurs remain unclear.

METHODS

We completed a secondary analysis of cross-sectional data collected on adults with symptomatic HF to test our hypothesis that effective self-care is associated with less myocardial stress and systemic inflammation. Multivariate logistic regression modeling was used to determine if better HF self-care reduced the odds of having serum levels of amino-terminal pro-B-type natriuretic peptide and soluble tumor necrosis factor α receptor type 1 at or greater than the sample median. Heart failure self-care was measured using the Self-care of Heart Failure Index.

RESULTS

The sample (n=168) was predominantly male (65.5%), and most (50.6%) had New York Heart Association III HF (mean left ventricular ejection fraction, 34.9% [SD, 14.0%]); mean age was 58.8 (SD, 11.5) years. Self-care management was an independent factor in the model (block χ=14.74; P=.005) after controlling for pertinent confounders (model χ=52.15; P<.001). Each 1-point increase in self-care management score (range, 15-100) was associated with a 12.7% reduction in the odds of having levels of both biomarkers at or greater than the sample median (adjusted odds ratio, 0.873; 95% confidence interval, 0.77-0.99; P=.03).

CONCLUSION

Better self-care management was associated with reduced odds of myocardial stress and systemic inflammation over and above pharmacological therapy and other common confounding factors. Teaching HF patients early symptom recognition and self-care of symptoms may decrease myocardial stress and systemic inflammation.

Brain natriuretic peptide-guided treatment does not improve morbidity and mortality in extensively treated patients with chronic heart failure: responders to treatment have a significantly better outcome

AIM

To determine whether brain natriuretic peptide (BNP)-guided heart failure (HF) treatment improves morbidity and/or mortality when compared with conventional treatment.

METHODS AND RESULTS

UPSTEP was an investigator-initiated, randomized, parallel group, multicentre study with a PROBE design. Symptomatic patients with worsening HF, New York Heart Association class II-IV, ejection fraction <40% and elevated BNP levels, were included. All patients (n= 279) were treated according to recommended guidelines and randomized to BNP-guided (BNP) or to conventional (CTR) HF treatment. The goal was to reduce BNP levels to <150 ng/L in younger patients and <300 ng/L in elderly patients, respectively. The primary outcome was a composite of death due to any cause, need for hospitalization and worsening HF. The study groups were well matched, including for BNP concentration at entry (mean: 808 vs. 899 ng/L; P= 0.34). There were no significant differences between the groups regarding either the primary outcome (P = 0.18) or any of the secondary endpoints. There were no differences for the pre-specified analyses; days out of hospital, and younger vs. elderly. A subgroup analysis comparing treatment responders (>30% decrease in baseline BNP value) vs. non-responders found improved survival among responders (P< 0.0001 for the primary outcome), and all of the secondary endpoints were also improved.

CONCLUSIONS

Morbidity and mortality were not improved by HF treatment guided by BNP levels. However, BNP responders had a significantly better clinical outcome than non-responders. Future research is needed to elucidate the responsible pathophysiological mechanisms in this sub-population.

Profiling B-type natriuretic peptide in a stable heart failure population: a valuable adjunct to care

AIM

To examine the prognostic importance of absolute values and change in values of BNP in patients with stable heart failure (HF).

METHODS

Five-hundred and fifty-nine patients attending a disease management programme were categorized into tertiles of BNP (group 1; ≤ 95 pg/ml, group 2; 96-249 pg/ml and group 3; ≥ 250 pg/ml). A change in BNP between two stable visits was recorded. Patients were followed up for 1 year for death and a composite morbidity measure of HF hospitalization, all-cause hospitalization, unscheduled visits for clinical deterioration(UC) of HF using survival analysis.

RESULTS

The risk of the combined morbidity outcome increased with increasing tertiles of BNP (Log rank = 17.8 (2), p < 0.001). Furthermore, a 50 and 25% increase in BNP predicted morbidity in stable HF patients with an initial BNP > 200 pg/ml (p = 0.02) and > 450 pg/ml (p = 0.03), respectively.

CONCLUSION

In a stable community HF population, an elevated BNP or an increase in BNP predicts an adverse prognosis thereby potentially identifying a population in need of closer clinical follow-up.

Biological variation of brain natriuretic peptide and cardiac events in stable outpatients with nonischemic chronic heart failure

BACKGROUND

To evaluate the biological variation and prognostic value of brain natriuretic peptide (BNP) for stable outpatients with nonischemic chronic heart failure (NICHF).

METHODS AND RESULTS

Biological variation in BNP was evaluated using an automated assay system in 140 outpatients with NICHF. The stable clinical condition during the 2-month study period was defined as unchanged NYHA and unchanged left ventricular ejection fraction; therefore, 7 patients were excluded during the 2 months. Thereafter, 133 patients were prospectively followed and the relationship between cardiac events and the plasma BNP concentrations (at baseline and after 2 months) were evaluated as well as the changes in BNP. The biological variation in BNP (2-month interval) was calculated as 22.3%. During a mean follow-up period of 42 months, 26 patients had cardiac events. According to stepwise multivariate analyses, plasma BNP after 2 months (P=0.0002) and % change in BNP (P=0.0067) were significant independent predictors of cardiac events.

CONCLUSIONS

These findings indicated that a combination of the absolute value of BNP after 2 months and % increase in BNP (2-month interval) is useful for predicting cardiac events in stable outpatients with NICHF.

Prognostic Value of Emerging Neurohormones in Chronic Heart Failure during Optimization of Heart Failure–Specific Therapy

Background: Serial measurements of neurohormones have been shown to improve prognostication in the setting of acute heart failure (HF) or chronic HF without therapeutic intervention. We investigated the prognostic role of serial measurements of emerging neurohormones and BNP in a cohort of chronic HF patients undergoing increases in HF-specific therapy.

Methods: In this prospective study we included 181 patients with chronic systolic HF after an episode of hospitalization for worsening HF. Subsequently, HF therapy was gradually increased in the outpatient setting until optimized. We measured copeptin, midregional proadrenomedullin, C-terminal endothelin-1 precursor fragment, midregional proatrial natriuretic peptide, and B-type natriuretic peptide before and after optimization of HF therapy. The primary endpoint was all-cause mortality at 24 months.

Results: Angiotensin-converting enzyme/angiotensin receptor blocker and β-blockers were increased significantly during the 3-month titration period (P &lt; 0.0001 for both). In a stepwise Cox regression analysis adjusted for age, sex, glomerular filtration rate, diabetes mellitus, and ischemic HF, baseline and follow-up neurohormone concentrations were predictors of the primary endpoint as follows (baseline hazard ratios): copeptin 1.92, 95% CI 1.233–3.007, P = 0.004; midregional proadrenomedullin 2.79, 95% CI 1.297–5.995, P = 0.009; midregional proatrial natriuretic peptide 2.05, 95% CI 1.136–3.686, P = 0.017; C-terminal endothelin-1 precursor fragment 2.24, 95% CI 1.133–4.425, P = 0.025; B-type natriuretic peptide 1.46, 95% CI 1.039–2.050, P = 0.029.

Conclusions: In pharmacologically unstable chronic HF patients, baseline values and follow-up measures of copeptin, midregional proadrenomedullin, C-terminal endothelin-1 precursor fragment, midregional proatrial natriuretic peptide, and B-type natriuretic peptide were equally predictive of all-cause mortality. Relative change of neurohormone values was noncontributory.

Coping styles in heart failure patients with depressive symptoms

OBJECTIVE

Elevated depressive symptoms have been linked to poorer prognosis in heart failure (HF) patients. Our objective was to identify coping styles associated with depressive symptoms in HF patients.

METHODS

A total of 222 stable HF patients (32.75% female, 45.4% non-Hispanic black) completed multiple questionnaires. Beck Depression Inventory (BDI) assessed depressive symptoms, Life Orientation Test (LOT-R) assessed optimism, ENRICHD Social Support Inventory (ESSI) and Perceived Social Support Scale (PSSS) assessed social support, and COPE assessed coping styles. Linear regression analyses were employed to assess the association of coping styles with continuous BDI scores. Logistic regression analyses were performed using BDI scores dichotomized into BDI<10 vs. BDI> or =10, to identify coping styles accompanying clinically significant depressive symptoms.

RESULTS

In linear regression models, higher BDI scores were associated with lower scores on the acceptance (beta=-.14), humor (beta=-.15), planning (beta=-.15), and emotional support (beta=-.14) subscales of the COPE, and higher scores on the behavioral disengagement (beta=.41), denial (beta=.33), venting (beta=.25), and mental disengagement (beta=.22) subscales. Higher PSSS and ESSI scores were associated with lower BDI scores (beta=-.32 and -.25, respectively). Higher LOT-R scores were associated with higher BDI scores (beta=.39, P<.001). In logistical regression models, BDI> or =10 was associated with greater likelihood of behavioral disengagement (OR=1.3), denial (OR=1.2), mental disengagement (OR=1.3), venting (OR=1.2), and pessimism (OR=1.2), and lower perceived social support measured by PSSS (OR=.92) and ESSI (OR=.92).

CONCLUSION

Depressive symptoms in HF patients are associated with avoidant coping, lower perceived social support, and pessimism. Results raise the possibility that interventions designed to improve coping may reduce depressive symptoms.

Variability of N-Terminal Probrain Natriuretic Peptide in Stable Chronic Heart Failure and Its Relation to Changes in Clinical Variables

Background: We investigated the variability of N-terminal probrain natriuretic peptide (NT-proBNP) and its relation to known confounding variables in patients with stable chronic heart failure who were on a stable optimized medication regimen.

Methods: At 4 sampling intervals (14-day, 1-month, 2-month, and 3-month) the results for NT-proBNP measurements and several clinical variables were measured in samples from 41 patients with chronic systolic dysfunction who met 21 prespecified criteria for stability.

Results: Mean within-person NT-proBNP variabilities expressed as percentage CV were 17.6%, 18.9%, 15.5%, and 16.2% at 14-day, 1-month, 2-month, and 3-month follow-up, respectively, and the corresponding reference change values were 34.6%, 52.5%, 43.1%, and 45.0%, respectively. Within-person variability of NT-proBNP was not found to be associated with renal function, weight, or waist circumference. Likewise, age, sex, baseline NT-proBNP, New York Heart Association functional class, and ejection fraction did not influence variability of NT-proBNP. The index of individuality ranged from 0.07–0.15 depending on the time interval between test results.

Conclusions: Although other reported studies have revealed variations in the range of 80%, in this prespecified stable heart-failure population variation of NT-proBNP at 14-day, 1-month, 2-month, and 3-month follow-up was lower and was not related to renal function or weight. In view of the low index of individuality we observed, within-person variation is quite low compared to between-person variation. Consideration of these facts is important for the interpretation of clinical trials and the use of NT-proBNP in monitoring patients with heart failure.

How often we need to measure brain natriuretic peptide (BNP) blood levels in patients admitted to the hospital for acute severe heart failure? Role of serial measurements to improve short-term prognostic stratification

BACKGROUND

Brain natriuretic peptide (BNP) is increasingly used in the management of patients with heart failure (HF). It is still unclear how to use serial BNP measurement in HF.

AIM

To evaluate the usefulness of three consecutive measurements of BNP in patients (pts) hospitalized for acute HF.

METHODS

Clinical evaluation, BNP levels and echocardiography were assessed in 150 pts (67% males, age: 69+/-12 years; left ventricular ejection fraction: 34+/-14%) admitted for severe HF (NYHA class III-IV: 146/150). BNP measurements were obtained: at admission (basal, T0), at discharge (T1) and at first ambulatory control (T2), after optimization of medical therapy in those with discharge BNP level >250 pg/mL. End-points were death and hospital readmission during 6-month follow-up.

RESULTS

According to BNP levels 3 groups of patients were identified: Group 1 (62 pts, 41%), in whom discharge (T1) BNP was high and persisted elevated at T2 despite aggressive medical therapy; at 6-month follow-up 72% died or were hospitalized for HF. Group 2 (36 pts, 24%), in whom discharge (T1) BNP was high but decreased after medical therapy (T2); death and HF-readmission were observed in 8 pts (26%). Group 3 (52 pts, 35%), in whom discharge (T1) BNP levels were <250 pg/mL and persisted below this value at T2; death and HF-hospital readmission were observed in 6 pts (12%). Event rate differences among groups were statistically significant (p<0.001). At Cox-analysis discharge BNP cutoff of 250 pg/mL was the only parameter predictive of a worse outcome.

CONCLUSION

These data suggest that 3 BNP measurements, at admission, at discharge and few weeks later can allow to identify HF pts whom, despite a further potentiation of medical therapy, will present a worsening or even will die during short-term follow-up.

Long-term effects of peroxisome proliferator-activated receptor ligand bezafibrate on N-terminal pro-B type natriuretic peptide in patients with advanced functional capacity impairment

Background

The effects of pan-peroxisome proliferator-activated receptor (PPAR) ligand bezafibrate on N-terminal pro-B type natriuretic peptide (ProBNP) level in patients with coronary artery disease (CAD) is unknown. The current study aimed to investigate the long-term effects of bezafibrate on ProBNP level in patients with pre-existing CAD and advanced functional capacity impairment.

Methods

Metabolic and inflammatory parameters were analyzed from stored frozen serum samples obtained from 108 patients enrolled in the Bezafibrate Infarction Prevention (BIP) Study. They presented with New York Heart Association (NYHA) functional class III, comprising 58 patients in the bezafibrate group and 50 in the placebo groups, and completed a 2-year prospective, double-blind, placebo-controlled follow-up.

Results

During follow-up ProBNP level did not change significantly in the placebo group, whereas it increased slightly in the bezafibrate group, which was older and with lower baseline ProBNP values. No significant differences between the groups were found for ProBNP levels after 2 year of follow-up. Analysis-of-covariance (ANCOVA) -taking into account age and baseline ProBNP level- showed that bezafibrate was not associated with longitudinal ProBNP changes during the follow-up period (p = 0.3).

Conclusion

Long-term treatment by bezafibrate was not associated with longitudinal ProBNP changes in patients with pre-existing CAD and advanced functional capacity impairment.

Current concepts of neurohormonal activation in heart failure: mediators and mechanisms

Neurohormonal activation is a commonly cited array of phenomena in the body's physiologic response to heart failure. Although various neurohormones and pharmacologic agents that moderate their pathophysiologic effects have been reviewed in the nursing literature, both the mechanisms of neurohormonal system activation and cellular and organ system effects have been described only in brief. Accordingly, this article reviews mechanisms of neurohormonal activation and describes cellular and cardiovascular effects of the (1) sympathetic nervous system, (2) renin-angiotensin-aldosterone system, (3) kallikrein-kininogen-kinin system, (4) vasopressinergic system, (5) natriuretic peptide systems, and (6) endothelin in the context of heart failure. This article implicitly details the physiologic basis for numerous current and potential future pharmacologic agents used in the management of heart failure. It is intended that this article be used as a reference for advanced clinical nursing practice, research, and education.

Usefulness of serial assessment of natriuretic peptides in the emergency department for patients with acute decompensated heart failure

The value of natriuretic peptides, both B-type natriuretic peptide (BNP) and N-terminal prohormone brain natriuretic peptide (NTproBNP), for determining diagnosis, severity, and prognosis of emergency department (ED) patients with acute decompensated heart failure (ADHF) has been well documented. Emerging data support the hypothesis that repeated natriuretic peptide determinations in the acute phase of ADHF may assist in confirming the diagnosis, monitoring drug therapy, and evaluating the adequacy of patient stabilization. Data from the authors' group demonstrate that in patients admitted to the ED for acute dyspnea, serial NTproBNP measurement at admission and 4, 12, and 24 hours later was useful in confirming the diagnosis of ADHF compared with patients with chronic obstructive pulmonary disease. Moreover, in the same patients receiving intensive intravenous diuretic therapy, there was a progressive reduction of NTproBNP blood levels from hospitalization to discharge (P<.001), accompanied by clinical improvement and stabilization of heart failure. More recently, the authors also demonstrated that in ADHF patients improving with diuretics, a progressive reduction in BNP levels was observed, starting 24 hours after ED admission and continuing until discharge. Comparing BNP and NTproBNP, there was a significant correlation between NTproBNP and BNP levels but not between NTproBNP's and BNP's percent variation compared with baseline. In ADHF, serial ED measurements of BNP are useful for monitoring the effects of treatment. A reduction in BNP from admission to discharge is indicative of clinical improvement.

Inpatient monitoring and prognostic importance of B-type natriuretic peptide

Acute decompensated heart failure (ADHF) is the leading cause of hospitalization in many industrialized countries. Despite a consistent body of data demonstrating the benefits of drug therapy, the prognosis of patients admitted with ADHF remains dismal, as it is associated with high readmission and mortality rates within 6 months of admission. ADHF is a largely hemodynamic disorder; 90% of hospitalized patients present with volume overload. Neurohormonal activation characterizes the disease; the B-type natriuretic peptide (BNP) and N-terminal prohormone brain natriuretic peptide are natriuretic and vasodilating peptides released from the cardiac ventricles as a response to ventricular volume expansion and relate to outcome. While BNP levels obtained on admission provide independent prognostic information of in-hospital mortality, BNP levels during and at the completion of hospitalization can help to achieve euvolemia and may reflect adequacy of treatment. Once euvolemia is reached, BNP level correlated with functional class and prognosis. Studies using natriuretic peptides have suggested that predischarge BNP level appeared to be the strongest predictor for identifying subsequent death or hospital admission at 6 months. The addition of predischarge BNP levels to a clinical/instrumental decisional score for discharge decision should make possible the detection of high-risk patients who need reinforced treatment or follow-up.

N-terminal Pro-B–Type Natriuretic Peptide (NT-proBNP) Concentrations in Hemodialysis Patients: Prognostic Value of Baseline and Follow-up Measurements

Background: Increased N-terminal pro-B–type natriuretic peptide (NT-proBNP) concentrations are associated with increased cardiovascular mortality in chronic hemodialysis patients. Previous studies focused on prevalent dialysis patients and examined single measurements of NT-proBNP in time.

Methods: We measured NT-proBNP concentrations in 2990 incident hemodialysis patients to examine the risk of 90-day and 1-year mortality associated with baseline NT-proBNP concentrations. In addition, we calculated the change in concentrations after 3 months in a subset of 585 patients to examine the association between longitudinal changes in NT-proBNP and subsequent mortality.

Results: Increasing quartiles of NT-proBNP were associated with a monotonic increase in 90-day [quartile 1, referent; from quartile 2 to quartile 4, hazard ratio (HR) 1.7–6.3, P &lt; 0.001] and 1-year (quartile 1, referent; from quartile 2 to quartile 4, HR 1.7–4.9, P &lt; 0.001) all-cause mortality. After multivariable adjustment, these associations remained robust. When examined using a multivariable fractional polynomial, increased NT-proBNP concentrations were associated with increased 90-day (HR per unit increase in log NT-proBNP 1.5, 95% CI 1.3–1.7) and 1-year (HR per unit increase in log NT-proBNP 1.4, 95% CI 1.3–1.5) all-cause mortality. In addition, patients with the greatest increase in NT-proBNP after 3 months of dialysis had a 2.4-fold higher risk of mortality than those with the greatest decrease in NT-proBNP.

Conclusions: NT-proBNP concentrations are independently associated with mortality in incident hemodialysis patients. Furthermore, the observation that longitudinal changes in NT-proBNP concentrations were associated with subsequent mortality suggests that monitoring serial NT-proBNP concentrations may represent a novel tool for assessing adequacy and guiding therapy in patients initiating hemodialysis.

Relationship between CD40 ligand expression and B type natriuretic peptide levels in patients with chronic heart failure

BACKGROUND

Inflammation plays a pathogenic role in the development of chronic heart failure (CHF). Increasing evidence shows that CD40-CD40 ligand (CD40L) interaction plays a pathogenic role in inflammatory disorders. We assessed whether CD40 ligand expression was abnormal in patients with CHF.

METHODS

Twenty normal controls and 86 patients with CHF were investigated. The expression of CD40L on platelets was analyzed by indirect-immunofluorescence flow cytometry, and the soluble CD40L (sCD40L) level was determined by a commercially available enzyme-linked immunosorbent assay (ELISA). B type natriuretic peptide (BNP) was measured by radioimmunoassay.

RESULTS

All patients with CHF showed a significant increased expression of CD40L (32.3+/-13.9 MFI) on platelets and sCD40L levels (20.5+/-8.6 microg/l) compared with controls(p<0.0001). CD40L expression on platelets and sCD40L levels positively correlated with New York Heart Association (NYHA) functional class, left ventricular ejection fraction and BNP levels in CHF.

CONCLUSIONS

Patients with CHF showed increased expression of CD40L system, which may create a pathogenic role in the development and progression of CHF.

Usefulness of clinical and NT-proBNP monitoring for prognostic guidance in destabilized heart failure outpatients

AIMS

To study the relative prognostic value of N-terminal pro-B-type natriuretic peptide (NT-proBNP) monitoring in addition to clinical disease severity scores (CDSSs) in outpatients with destabilized heart failure (HF).

METHODS AND RESULTS

Seventy-one outpatients with recently destabilized HF were recruited. At baseline, and at all following visits, a CDSS based on Framingham criteria was obtained, and NT-proBNP levels were measured in a blind fashion. CDSS did not correlate with NT-proBNP levels at any time (P > 0.1), although their relative changes correlated during follow-up (P < 0.001). Forty patients (56%) had clinical events (cardiovascular death and/or HF hospitalization) within 1 year of follow-up. Changes in CDSS from baseline were not predictive of subsequent events (P > 0.1 for all visits), whereas changes in NT-proBNP levels were predictive at several time points: week 2 (P = 0.005), week 3 (P = 0.037), week 4 (P = 0.015), and 6 months (P = 0.026). A change in NT-proBNP levels at follow-up week 2 (%) added independent prognostic information (P < 0.001, HR 0.982, 95% CI 0.972-0.992) to baseline CDSS (P = 0.002, HR 2.05, 95% CI 1.290-3.266), age (P = 0.007, HR 1.034, 95% CI 1.009-1.059), and left ventricular ejection fraction (P = 0.013, HR 0.942, 95% CI 0.898-0.987).

CONCLUSION

Serial monitoring for per cent change in NT-proBNP concentrations offers superior prognostic information to clinical assessment among outpatients with recent destabilized HF.

Outpatient monitoring and treatment of chronic heart failure guided by amino-terminal pro-B-type natriuretic peptide measurement

Amino-terminal pro-B-type natriuretic peptide (NT-proBNP) is a strong and independent prognostic marker in patients across the spectrum of heart failure (HF) stages, including patients managed in the outpatient setting. Serial measures of NT-proBNP are more valuable than single measures for prognosis, and biologic variation of the marker should allow serial monitoring. Furthermore, given that NT-proBNP levels decrease in response to the addition of therapies with proven benefit for HF (including angiotensin-converting enzyme inhibitors, angiotensin receptor blockers, diuretics, spironolactone, exercise therapy, and biventricular pacing), it is logical to expect that targeting therapy to decrease NT-proBNP levels may facilitate more optimal use of proven HF therapies and may reduce adverse clinical outcomes. The optimal strategy for NT-proBNP monitoring with regard to frequency of testing or whether to use standard or individualized targets is still being determined. Preliminary results are promising for targeting an outpatient NT-proBNP concentration of approximately < or =1,000 ng/L. Current data suggest that when NT-proBNP levels are not at goal or increase from prior measurements, the risk for hazard is increased. Adjustments in treatment and serial clinical follow-up with NT-proBNP retesting should be considered at frequent intervals until biochemical stabilization or achievement of a maximally tolerated medical program.

Serial NT-proBNP monitoring and outcomes in outpatients with decompensation of heart failure

BACKGROUND

NT-proBNP is useful for heart failure (HF) diagnosis and prognosis. We examined the value of serial NT-proBNP monitoring to predict outcomes in decompensated HF patients attending a structured HF clinic.

METHODS

Patients with decompensation of established optimally treated HF, not requiring emergency hospital admission, were enrolled in the study. Patients received intensive follow-up weekly during 4 weeks and at 3 months in specialist HF clinics. Serial NT-proBNP concentrations were measured at each visit. Primary endpoint was cardiovascular death and hospital admission for HF at 3 months.

RESULTS

Fifty-nine patients were enrolled (60+/-14 years, LVEF 27+/-9%) and 39% had a primary endpoint during follow-up. Baseline NT-proBNP concentration (in ng/L) was 7050+/-6620, and did not differ significantly in patients with and without events (p=0.22). Patients without events showed marked NT-proBNP reduction at week-1 (30% reduction), week-2 (36% reduction), week-3 (34% reduction) and week-4 (37% reduction). By contrast, patients with events showed no significant NT-proBNP reduction during follow-up. Using a general linear model, the relative NT-proBNP reductions (%) at weeks 1-4 were predictors of adverse events (p=0.004, p<0.001, p=0.001 and p=0.03, respectively). In a stepwise multiple Cox regression analysis, NT-proBNP relative reduction (in %) at week 2 was a strong predictor of no events during follow-up (OR 0.79, 95% CI 0.70-0.88, p<0.001).

CONCLUSIONS

Serial NT-proBNP monitoring in decompensated HF patients seen in a structured in-hospital HF clinic predicts cardiovascular events during follow-up. NT-proBNP may be useful in an outpatient basis to identify patients at high risk needing more aggressive therapy.

Prognostic importance of plasma NT-pro BNP in chronic heart failure in patients treated with a β-blocker: Results from the Carvedilol Or Metoprolol European Trial (COMET) trial

BACKGROUND

Plasma levels of N-terminal pro-brain natriuretic peptide (NT-pro BNP) are increased in patients with chronic heart failure (CHF). Beta-blockers (BB) may influence these levels but it is unclear whether changes in NT-pro BNP reflect concomitant changes in prognosis.

OBJECTIVES

To assess the prognostic importance of NT-pro BNP at baseline and during follow-up, in patients in whom beta-blocker therapy is initiated.

METHODS

In COMET, 3029 patients with CHF in NYHA class II-IV and EF<35% were randomised to carvedilol or metoprolol tartrate and were followed for an average of 58 months. Blood samples were collected for the measurement of NT-pro BNP at baseline (n=1559) and during follow-up (n=309).

RESULTS

Baseline plasma concentrations of NT-pro BNP above the median (1242 pg/ml) were associated with higher all-cause mortality (RR 2.77; 95% CI 2.33-3.3, p<0.001). Patients who achieved NT-pro BNP levels<400 pg/ml during follow-up had a lower subsequent mortality (RR 0.32; 95% CI 0.15-0.69, p=0.004).

CONCLUSIONS

The plasma concentration of NT-pro BNP is a powerful predictor of mortality in patients with CHF. Patients who achieve an NT-pro BNP of <400 pg/ml subsequent to treatment with a beta-blocker have a favourable prognosis.

Concentrations of brain natriuretic peptide in the plasma predicts outcomes of treatment of children with decompensated heart failure admitted to the Intensive Care unit

OBJECTIVES

It is known that levels of brain natriuretic peptide predict outcomes of treatment for adults with decompensated heart failure. We hypothesized that it could predict outcomes in children with this condition.

METHODS

We divided retrospectively 82 patients with serial measurements of brain natriuretic peptide into 3 groups: those who survived and did not need readmission within less than 60 days; those who survived but needed readmission within less than 60 days; and those who died in hospital or within less than 60 days. Initial and final levels of the peptide correlated with adverse outcomes.

RESULTS

The percent change in level of the peptide was minus 78 percent, minus 38 percent, and 138 percent in the readmission-free group, the readmitted, and nonsurviving groups, respectively. Final levels were significantly lower in the readmission-free group than in the readmitted and nonsurviving groups (p equals 0.013 and p is less than 0.00001, respectively) and in the readmitted group than in the nonsurvivors (p equals 0.013). On univariate analysis, the final level, the change in level, and the percentage change in level significantly predicted outcomes (p equals 0.0002, 0.0072 and 0.0005, respectively). On multivariate analysis, only the final level of the peptide significantly predicted outcomes (p equals 0.01).

CONCLUSIONS

A final level of brain natriuretic peptide of greater than or equal to 760 picograms per millilitre strongly predicted an adverse outcome. Patients with higher final levels may be at higher risk of death and readmission, suggesting that this variable effectively predicts the response to treatment and prognosis in children with heart failure.

Brain natriuretic peptide: clinical and research challenges

Natriuretic peptides, in particular, brain or B-type, are useful for the assessment of patients presenting with dyspnea to the medical office or emergency department. Levels of natriuretic peptides are useful for assessing prognosis of heart failure or coronary syndrome patients. Less is known about serial peptide measurements for guiding treatment strategies in heart failure. The authors review the uses, pitfalls, and practical points for using natriuretic peptides clinically.

Asymmetric dimethylarginine enhances cardiovascular risk prediction in patients with chronic heart failure

OBJECTIVE

The purpose of this study was to investigate whether elevated asymmetrical dimethylorginine (ADMA) concentrations are associated with increased cardiovascular risk in chronic heart failure (HF) patients.

METHODS AND RESULTS

253 patients with symptomatic chronic HF and impaired left ventricular function (median age 70 years, 202 males) were followed for a median of 14.2 months (interquartile range 6.8 to 21.2). ADMA and N-terminal pro-brain natriuretic peptide (NT-proBNP) were assessed by high performance liquid chromatography and by an enzyme-linked immunosorbent assay, respectively. Subjects with ADMA concentrations in the highest tertile had a significantly higher adjusted hazard ratio (HR; 2.00; 95% confidence interval [CI] 1.01 to 3.97) for occurrence of an end point (cardiac decompensation, major adverse cardiovascular events or all-cause mortality) compared with patients in the lowest tertile (P=0.046) during the first 6 months of follow-up. NT-proBNP also identified subjects at risk before adjustment for confounders at 6 and 12 months of follow-up. HR for patients with ADMA and NT-proBNP in the highest tertile was significantly increased (3.68, CI 1.67 to 8.14; at 6 months follow-up) compared with patients without ADMA and NT-proBNP in the highest tertile (P<0.001).

CONCLUSIONS

Elevated ADMA plasma concentrations are associated with adverse cardiovascular outcome in patients with chronic HF. Quantification of ADMA with NT-proBNP improves risk stratification in this cohort.

Plasma brain natriuretic peptide-guided therapy to improve outcome in heart failure: the STARS-BNP Multicenter Study

OBJECTIVES

The aim of this multicenter study was to evaluate the prognostic impact of a therapeutic strategy using plasma brain natriuretic peptide (BNP) levels.

BACKGROUND

The prognosis of chronic heart failure (CHF) remains poor, even among patients treated in specialized departments.

METHODS

A total of 220 New York Heart Association functional class II to III patients considered optimally treated with angiotensin-converting enzyme inhibitors (ACEIs), beta-blockers, and diuretics by CHF specialists were randomized to medical treatment according to either current guidelines (clinical group) or a goal of decreasing BNP plasma levels <100 pg/ml (BNP group). Outpatient visits were scheduled every month for 3 months, then every 3 months. The primary combined end point was CHF-related death or hospital stay for CHF.

RESULTS

Both groups were similar for baseline clinical and biological characteristics. Left ventricular ejection fraction was slightly lower in the BNP group than in the clinical group (29.9 +/- 7.7% vs. 31.8 +/- 8.4%, p = 0.05). At the end of the first 3 months, all types of drugs were changed more frequently in the BNP group. Mean dosages of ACEIs and beta-blockers were significantly higher in the BNP group (p < 0.05), whereas the mean increase in furosemide dosage was similar in both groups. During follow-up (median 15 months), significantly fewer patients reached the combined end point in the BNP group (24% vs. 52%, p < 0.001).

CONCLUSIONS

In optimally treated CHF patients, a BNP-guided strategy reduced the risk of CHF-related death or hospital stay for CHF. The result was mainly obtained through an increase in ACEI and beta-blocker dosages.

Diagnostic, prognostic, and therapeutic implications of brain natriuretic peptide in dialysis and nondialysis-dependent chronic renal failure

Premature cardiovascular disease is the leading cause of morbidity and mortality in patients with end-stage renal failure. Natriuretic peptides, specifically brain natriuretic peptide, are released from the heart in response to chamber distension and thus increased in the presence of volume expansion and cardiac overload. Their physiological role is to cause vasodilatation and promote natriuresis to maintain volume homeostasis. Increasingly serum levels of brain natriuretic peptide are used to both diagnose and manage cardiovascular disorders. Furthermore, augmenting the beneficial hemodynamic actions of brain natriuretic peptide may have a therapeutic role in decompensated heart failure. However, the diagnostic role of serum brain natriuretic peptide levels in patients with advanced renal dysfunction remains to be defined. These patients have a high prevalence of left ventricular disorders, specifically left ventricular hypertrophy, which may reduce the diagnostic utility of brain natriuretic peptide. In addition, ventricular stretch may be determined by intravascular volume status rather than by cardiac dysfunction. Nonetheless, as the prognosis of patients with end-stage renal failure and co-existing heart failure is so poor, the availability of a further marker of cardiac ''distress'' may in the future become a useful diagnostic tool and in due course may become a primary goal for titration and tailoring of therapy.