Friedhelm Sayk

2.5k total citations
63 papers, 1.5k citations indexed

About

Friedhelm Sayk is a scholar working on Cardiology and Cardiovascular Medicine, Surgery and Endocrine and Autonomic Systems. According to data from OpenAlex, Friedhelm Sayk has authored 63 papers receiving a total of 1.5k indexed citations (citations by other indexed papers that have themselves been cited), including 18 papers in Cardiology and Cardiovascular Medicine, 15 papers in Surgery and 11 papers in Endocrine and Autonomic Systems. Recurrent topics in Friedhelm Sayk's work include Heart Rate Variability and Autonomic Control (12 papers), Escherichia coli research studies (7 papers) and Viral gastroenteritis research and epidemiology (6 papers). Friedhelm Sayk is often cited by papers focused on Heart Rate Variability and Autonomic Control (12 papers), Escherichia coli research studies (7 papers) and Viral gastroenteritis research and epidemiology (6 papers). Friedhelm Sayk collaborates with scholars based in Germany, United Kingdom and United States. Friedhelm Sayk's co-authors include Christoph Dodt, Hendrik Lehnert, Peter Wellhöner, Alfred C. Feller, Stefan Krüger, Daniel Droemann, Hartwig Büttner, Andreas Böhle, Christoph R. Becker and Martin Nitschke and has published in prestigious journals such as JAMA, Circulation and SHILAP Revista de lepidopterología.

In The Last Decade

Friedhelm Sayk

58 papers receiving 1.5k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Friedhelm Sayk Germany 21 338 334 283 226 208 63 1.5k
Chih‐Cheng Huang Taiwan 24 209 0.6× 221 0.7× 285 1.0× 96 0.4× 406 2.0× 108 1.7k
Lucia Spicuzza Italy 26 170 0.5× 576 1.7× 737 2.6× 445 2.0× 127 0.6× 85 2.2k
Secundino Fernández Spain 18 181 0.5× 123 0.4× 566 2.0× 155 0.7× 186 0.9× 90 1.2k
Jeong Jin Lee South Korea 16 173 0.5× 103 0.3× 170 0.6× 95 0.4× 82 0.4× 59 981
K. Gourgoulianis Greece 19 93 0.3× 63 0.2× 551 1.9× 217 1.0× 198 1.0× 63 1.3k
Marta Cześnikiewicz‐Guzik Poland 25 353 1.0× 335 1.0× 465 1.6× 202 0.9× 311 1.5× 44 2.7k
Joaquin U. Gonzales United States 21 100 0.3× 287 0.9× 393 1.4× 126 0.6× 83 0.4× 73 1.3k
Hui Ouyang China 22 179 0.5× 106 0.3× 190 0.7× 89 0.4× 176 0.8× 82 1.5k
Dimitar Sajkov Australia 19 64 0.2× 177 0.5× 858 3.0× 593 2.6× 157 0.8× 36 1.6k
I. Fontana Italy 19 429 1.3× 33 0.1× 171 0.6× 91 0.4× 217 1.0× 94 2.1k

Countries citing papers authored by Friedhelm Sayk

Since Specialization
Citations

This map shows the geographic impact of Friedhelm Sayk's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Friedhelm Sayk with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Friedhelm Sayk more than expected).

Fields of papers citing papers by Friedhelm Sayk

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Friedhelm Sayk. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Friedhelm Sayk. The network helps show where Friedhelm Sayk may publish in the future.

Co-authorship network of co-authors of Friedhelm Sayk

This figure shows the co-authorship network connecting the top 25 collaborators of Friedhelm Sayk. A scholar is included among the top collaborators of Friedhelm Sayk based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Friedhelm Sayk. Friedhelm Sayk is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Castven, Darko, Friedhelm Sayk, Ashok K. Rout, et al.. (2025). PNPLA3 I148M variant links to adverse metabolic traits in MASLD during fasting and feeding. JHEP Reports. 7(8). 101450–101450. 1 indexed citations
2.
Sayk, Friedhelm, et al.. (2024). Auffällige Schilddrüsenwerte bei kritisch Kranken – harmlose Irritation oder echtes Problem?. Medizinische Klinik - Intensivmedizin und Notfallmedizin. 120(8). 634–641.
3.
Meusel, Moritz, Joachim G. Voss, Felix Machleidt, et al.. (2022). Intranasal orexin A modulates sympathetic vascular tone: a pilot study in healthy male humans. Journal of Neurophysiology. 127(2). 548–558. 8 indexed citations
4.
Sayk, Friedhelm, et al.. (2020). Angiotensin II-mediated nondipping during sleep in healthy humans: effects on baroreflex function at subsequent daytime. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 318(4). R813–R821. 4 indexed citations
5.
Meusel, Moritz, Martin Herrmann, Felix Machleidt, et al.. (2020). Intranasal oxytocin has sympathoexcitatory effects on vascular tone in healthy males. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 320(2). R162–R172. 3 indexed citations
6.
Otte, S. von, Bradford D. Fischer, & Friedhelm Sayk. (2017). Erfolgreiche „Lipidrescuetherapie“ bei Amitriptylin-Quetiapin-Mischintoxikation in mehrfach letaler Dosis. Medizinische Klinik - Intensivmedizin und Notfallmedizin. 113(4). 305–308. 3 indexed citations
7.
Derad, Inge, Alexander Katalinic, Nora Eisemann, et al.. (2015). Hypertension and mild chronic kidney disease persist following severe haemolytic uraemic syndrome caused by Shiga toxin-producing Escherichia coli O104:H4 in adults. Nephrology Dialysis Transplantation. 31(1). 95–103. 15 indexed citations
8.
Honselmann, Kim C., et al.. (2015). Long-term mortality and quality of life in intensive care patients treated for pneumonia and/or sepsis. Journal of Critical Care. 30(4). 721–726. 37 indexed citations
9.
Siegmund, Thorsten, et al.. (2014). Hyperglycemia in emergency patients – prevalence and consequences. European Journal of Emergency Medicine. 22(3). 181–187. 22 indexed citations
10.
Balabanova, Yanina, Yvonne Deleré, Hendrik Wilking, et al.. (2013). Serological Evidence of Asymptomatic Infections during Escherichia coli O104:H4 Outbreak in Germany in 2011. PLoS ONE. 8(9). e73052–e73052. 11 indexed citations
11.
Wellhöner, Peter, et al.. (2011). Intranasal application of the melanocortin 4 receptor agonist MSH/ACTH(4–10) in humans causes lipolysis in white adipose tissue. International Journal of Obesity. 36(5). 703–708. 17 indexed citations
12.
Rasch, Björn, Christoph Dodt, Friedhelm Sayk, Matthias Mölle, & Jan Born. (2011). No Elevated Plasma Catecholamine Levels during Sleep in Newly Diagnosed, Untreated Hypertensives. PLoS ONE. 6(6). e21292–e21292. 2 indexed citations
13.
Sayk, Friedhelm, Andreas H. Mahnken, Florian Stellmacher, Kim Dalhoff, & Hartmut Merz. (2010). Karzinom-in-Karzinom-Metastasierung eines amelanotischen Melanoms in ein Nierenzellkarzinom. DMW - Deutsche Medizinische Wochenschrift. 135(11). 507–510. 1 indexed citations
14.
Dodt, Christoph, et al.. (2008). Glukokortikoide und Hypertonie. Der Internist. 50(1). 36–41. 5 indexed citations
15.
Sayk, Friedhelm, Bernhard Schaaf, Peter Wellhoener, et al.. (2008). Endotoxemia causes central downregulation of sympathetic vasomotor tone in healthy humans. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 295(3). R891–R898. 57 indexed citations
16.
Sayk, Friedhelm, Inge Bos, U. Schubert, Thilo Wedel, & Hans-H. Sievers. (2005). Histopathologic Findings in a Novel Decellularized Pulmonary Homograft: An Autopsy Study. The Annals of Thoracic Surgery. 79(5). 1755–1758. 39 indexed citations
17.
Noack, F., Friedhelm Sayk, & U. Gembruch. (2005). Omphalocoele-Exstrophy-Imperforate Anus-Spinal Defects Complex in Dizygotic Twins. Fetal Diagnosis and Therapy. 20(5). 346–348. 17 indexed citations
18.
Sayk, Friedhelm, Stefan Krüger, Matthias Bechtel, et al.. (2004). Significant damage of the conduction system during cardioplegic arrest is due to necrosis not apoptosis. European Journal of Cardio-Thoracic Surgery. 25(5). 801–806. 5 indexed citations
19.
Heindl, S, J. Struck, Peter Wellhöner, Friedhelm Sayk, & Christoph Dodt. (2004). Effect of facial cooling and cold air inhalation on sympathetic nerve activity in men. Respiratory Physiology & Neurobiology. 142(1). 69–80. 52 indexed citations
20.
Noack, F., et al.. (2002). Ivemark syndrome with agenesis of the corpus callosum: a case report with a review of the literature. Prenatal Diagnosis. 22(11). 1011–1015. 9 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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