Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation

Search Page

Filters

My Custom Filters

Edit custom filters

Results by year

Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1964 1
1965 2
1967 1
1969 1
1971 2
1974 3
1975 3
1976 3
1977 2
1978 1
1979 1
1980 1
1981 1
1983 1
1984 2
1985 5
1986 5
1987 4
1988 4
1989 1
1990 2
1991 6
1992 8
1993 8
1994 12
1995 17
1996 23
1997 38
1998 40
1999 47
2000 75
2001 66
2002 70
2003 48
2004 80
2005 122
2006 110
2007 112
2008 118
2009 135
2010 135
2011 144
2012 148
2013 144
2014 138
2015 137
2016 143
2017 142
2018 213
2019 207
2020 239
2021 275
2022 264
2023 282
2024 251
2025 255
2026 159

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

4,155 results

Results by year

Filters applied: . Clear all
Page 1
Physiological time-series analysis using approximate entropy and sample entropy.
Richman JS, Moorman JR. Richman JS, et al. Am J Physiol Heart Circ Physiol. 2000 Jun;278(6):H2039-49. doi: 10.1152/ajpheart.2000.278.6.H2039. Am J Physiol Heart Circ Physiol. 2000. PMID: 10843903 Free article.
Entropy, as it relates to dynamical systems, is the rate of information production. Methods for estimation of the entropy of a system represented by a time series are not, however, well suited to analysis of the short and noisy data sets encountered in cardiovascula …
Entropy, as it relates to dynamical systems, is the rate of information production. Methods for estimation of the entropy of a …
Approximate entropy as a measure of irregularity for psychiatric serial metrics.
Pincus SM. Pincus SM. Bipolar Disord. 2006 Oct;8(5 Pt 1):430-40. doi: 10.1111/j.1399-5618.2006.00375.x. Bipolar Disord. 2006. PMID: 17042881 Review.
OBJECTIVES: The quantification of subtle patterns in sequential data, and their changes, has considerable potential utility throughout psychiatry, including the analyses of mood ratings, heart rate, respiratory, and electroencephalographic recordings. METHODS: Approximate …
OBJECTIVES: The quantification of subtle patterns in sequential data, and their changes, has considerable potential utility throughout psych …
ECG Approximate Entropy in the Elderly during Cycling Exercise.
Liou JW, Wang PS, Wu YT, Lee SK, Chang SD, Liou M. Liou JW, et al. Sensors (Basel). 2022 Jul 14;22(14):5255. doi: 10.3390/s22145255. Sensors (Basel). 2022. PMID: 35890935 Free PMC article.
Approximate entropy (ApEn) is used as a nonlinear measure of heart-rate variability (HRV) in the analysis of ECG time-series recordings. ...
Approximate entropy (ApEn) is used as a nonlinear measure of heart-rate variability (HRV) in the analysis of ECG time-series r …
The MM/PBSA and MM/GBSA methods to estimate ligand-binding affinities.
Genheden S, Ryde U. Genheden S, et al. Expert Opin Drug Discov. 2015 May;10(5):449-61. doi: 10.1517/17460441.2015.1032936. Epub 2015 Apr 2. Expert Opin Drug Discov. 2015. PMID: 25835573 Free PMC article. Review.
However, they contain several crude and questionable approximations, for example, the lack of conformational entropy and information about the number and free energy of water molecules in the binding site. ...
However, they contain several crude and questionable approximations, for example, the lack of conformational entropy and infor …
Approximate entropy analysis across electroencephalographic rhythmic frequency bands during physiological aging of human brain.
Pappalettera C, Cacciotti A, Nucci L, Miraglia F, Rossini PM, Vecchio F. Pappalettera C, et al. Geroscience. 2023 Apr;45(2):1131-1145. doi: 10.1007/s11357-022-00710-4. Epub 2022 Dec 20. Geroscience. 2023. PMID: 36538178 Free PMC article.
In the present study, we analyzed the effects of physiological aging on the human brain through entropy measures of electroencephalographic (EEG) signals. One hundred sixty-one participants were recruited and divided according to their age into young (n = 72) and elderly ( …
In the present study, we analyzed the effects of physiological aging on the human brain through entropy measures of electroencephalog …
Binarized cross-approximate entropy in crowdsensing environment.
Skoric T, Mohamoud O, Milovanovic B, Japundzic-Zigon N, Bajic D. Skoric T, et al. Comput Biol Med. 2017 Jan 1;80:137-147. doi: 10.1016/j.compbiomed.2016.11.019. Epub 2016 Dec 1. Comput Biol Med. 2017. PMID: 27940288
This paper proposes a computationally efficient binarised cross-approximate entropy, referred to as (X)BinEn, for unsupervised cardiovascular signal processing in environments where energy and processor resources are limited. METHODS: The proposed method is a descen …
This paper proposes a computationally efficient binarised cross-approximate entropy, referred to as (X)BinEn, for unsupervised …
Photoplethysmography-derived approximate entropy and sample entropy as measures of analgesia depth during propofol-remifentanil anesthesia.
Chen W, Jiang F, Chen X, Feng Y, Miao J, Chen S, Jiao C, Chen H. Chen W, et al. J Clin Monit Comput. 2021 Apr;35(2):297-305. doi: 10.1007/s10877-020-00470-6. Epub 2020 Feb 5. J Clin Monit Comput. 2021. PMID: 32026257 Clinical Trial.
The present work studied the properties of nonlinear methods including approximate entropy (ApEn) and sample entropy (SampEn) derived from PPG responding to a nociceptive stimulus under various opioid concentrations. Forty patients with ASA I or II were rando …
The present work studied the properties of nonlinear methods including approximate entropy (ApEn) and sample entropy (S …
Approximate entropy for all signals.
Chon K, Scully CG, Lu S. Chon K, et al. IEEE Eng Med Biol Mag. 2009 Nov-Dec;28(6):18-23. doi: 10.1109/MEMB.2009.934629. IEEE Eng Med Biol Mag. 2009. PMID: 19914883
Calculation of approximate entropy (ApEn) requires a priori determination of two unknown parameters, m and r. ...
Calculation of approximate entropy (ApEn) requires a priori determination of two unknown parameters, m and r. ...
Hypothermia and the approximate entropy of the electroencephalogram.
Levy WJ, Pantin E, Mehta S, McGarvey M. Levy WJ, et al. Anesthesiology. 2003 Jan;98(1):53-7. doi: 10.1097/00000542-200301000-00012. Anesthesiology. 2003. PMID: 12502979 Clinical Trial.
RESULTS: The approximate entropy of the electroencephalogram changed in a sigmoidal fashion during cooling and rewarming. ...CONCLUSIONS: Approximate entropy is a suitable analysis technique to quantify the electroencephalographic changes that occur wi …
RESULTS: The approximate entropy of the electroencephalogram changed in a sigmoidal fashion during cooling and rewarming. ...C …
4,155 results