Related Experiment Video
Updated: Apr 26, 2026
08:39
Experimental Protocol for Detecting Mitochondrial Function in Hepatocytes Exposed to Organochlorine Pesticides
Published on: September 16, 2020
7.7K
Effect of renal function loss on NT-proBNP level variations.
Larry H Bernstein1, Michael Y Zions, Salman A Haq
1Department of Pathology, New York Methodist Hospital, 506 6th Street, Brooklyn, NY 11215, USA. plbern@yahoo.com
Clinical Biochemistry
|March 21, 2009
Summary
A new method normalizes NT-proBNP levels using estimated glomerular filtration rate (eGFR), removing the need for age-based ranges. This improves the interpretation of NT-proBNP for heart failure detection and survival prediction.
Area of Science:
- Cardiology
- Biomarker Research
- Renal Function
Background:
- N-terminal pro-B-type natriuretic peptide (NT-proBNP) is crucial for diagnosing acute congestive heart failure (CHF) and predicting patient survival.
- Factors like renal function can influence NT-proBNP levels, complicating interpretation.
- Current interpretation often relies on age-specific reference ranges.
Purpose of the Study:
- To develop a more precise method for interpreting NT-proBNP levels.
- To establish an interpretation of NT-proBNP levels based on estimated glomerular filtration rate (eGFR), independent of patient age.
- To refine the use of NT-proBNP as a diagnostic and prognostic biomarker.
Main Methods:
- The study analyzed 247 patients, excluding those with CHF and known NT-proBNP confounders.
- A novel normalization function was applied: 1000 x log(NT-proBNP) divided by eGFR.
- Further adjustments were made for patient age to determine normalized NT-proBNP values.
Main Results:
- Normalized NT-proBNP levels were significantly influenced by eGFR.
- This eGFR-dependent effect on NT-proBNP was observed independently of the patient's age.
- The findings suggest a strong relationship between renal function and NT-proBNP levels.
Conclusions:
- A normalizing function incorporating eGFR effectively removes the need for age-based reference ranges for NT-proBNP.
- This approach offers a more standardized and accurate interpretation of NT-proBNP.
- The study enhances the clinical utility of NT-proBNP in managing heart failure.
Related Concept Videos
01:36Types of Toxins
3.6K
Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
3.6K
01:26Toxic Reactions: Overview
4.1K
When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
4.1K
01:26Effect of Hepatic Disease on Pharmacokinetics: Drug Dosing and Hepatic Blood Flow
379
Chronic liver disease significantly impacts drug metabolism due to alterations in hepatic blood flow and enzyme accessibility. This disruption affects the body's pharmacokinetics—the movement and processing of drugs within the system. Key enzymes crucial for metabolizing medications become less accessible, changing how drugs are processed and utilized. Furthermore, liver disease influences the synthesis of plasma proteins, such as albumin and globulins, which play critical roles in drug...
379
01:22Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test
271
In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess...
271
01:25Bioactivation and Tissue Toxicity
151
Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...
151
01:23Toxicity Testing in Animals
200
Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
200