Helma Freitag

1.8k total citations · 2 hit papers
29 papers, 997 citations indexed

About

Helma Freitag is a scholar working on Psychiatry and Mental health, Neurology and Epidemiology. According to data from OpenAlex, Helma Freitag has authored 29 papers receiving a total of 997 indexed citations (citations by other indexed papers that have themselves been cited), including 15 papers in Psychiatry and Mental health, 13 papers in Neurology and 7 papers in Epidemiology. Recurrent topics in Helma Freitag's work include Fibromyalgia and Chronic Fatigue Syndrome Research (15 papers), Long-Term Effects of COVID-19 (8 papers) and Neuroendocrine Tumor Research Advances (6 papers). Helma Freitag is often cited by papers focused on Fibromyalgia and Chronic Fatigue Syndrome Research (15 papers), Long-Term Effects of COVID-19 (8 papers) and Neuroendocrine Tumor Research Advances (6 papers). Helma Freitag collaborates with scholars based in Germany, Austria and United Kingdom. Helma Freitag's co-authors include Carmen Scheibenbogen, Kirsten Wittke, Claudia Kedor, Eckart Wildling, Franz Pusch, Patricia Grabowski, C. Weinstabl, R. Obwegeser, Elizabeth C. Huber and Leif G. Hanitsch and has published in prestigious journals such as Nature Communications, PLoS ONE and Neurology.

In The Last Decade

Helma Freitag

28 papers receiving 965 citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

A prospective observational study of post-COVID-19 chronic fatigue syndrome following the first pandemic wave in Germany and biomarkers associated with symptom severity

2022 169 citations Claudia Kedor, Helma Freitag et al. Nature Communications profile →
Endothelial dysfunction and altered endothelial biomarkers in patients with post-COVID-19 syndrome and chronic fatigue syndrome (ME/CFS)

2022 168 citations Helma Freitag, Gordon Rudolf et al. Journal of Translational Medicine profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Helma Freitag Germany	15	474	405	207	129	123	29	997
Pierre Langevin Canada	17	628 1.3×	291 0.7×	161 0.8×	41 0.3×	20 0.2×	42	1.6k
Svetlana Blitshteyn United States	14	396 0.8×	153 0.4×	355 1.7×	74 0.6×	49 0.4×	43	833
Gilhus Ne Norway	16	576 1.2×	462 1.1×	165 0.8×	40 0.3×	19 0.2×	34	1.4k
Ronit Gilad Israel	20	388 0.8×	300 0.7×	96 0.5×	50 0.4×	16 0.1×	75	1.2k
Kirsten Wittke Germany	13	453 1.0×	415 1.0×	31 0.1×	196 1.5×	122 1.0×	24	894
Joel C. Morgenlander United States	20	423 0.9×	153 0.4×	163 0.8×	30 0.2×	19 0.2×	61	994
Kamalesh Chakravarty India	15	196 0.4×	50 0.1×	107 0.5×	99 0.8×	46 0.4×	50	563
Claudia Kedor Germany	13	398 0.8×	297 0.7×	53 0.3×	118 0.9×	128 1.0×	33	791
Lawrence Richer Canada	15	192 0.4×	322 0.8×	205 1.0×	16 0.1×	26 0.2×	38	774
Kailash P. Bhatia United Kingdom	11	301 0.6×	122 0.3×	114 0.6×	29 0.2×	49 0.4×	41	621

Countries citing papers authored by Helma Freitag

Since Specialization

Citations

This map shows the geographic impact of Helma Freitag'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 Helma Freitag with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Helma Freitag more than expected).

Fields of papers citing papers by Helma Freitag

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Helma Freitag. 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 Helma Freitag. The network helps show where Helma Freitag may publish in the future.

Co-authorship network of co-authors of Helma Freitag

This figure shows the co-authorship network connecting the top 25 collaborators of Helma Freitag. A scholar is included among the top collaborators of Helma Freitag 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 Helma Freitag. Helma Freitag is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Meyer‐Arndt, Lil, Claudia Kedor, Kirsten Wittke, et al.. (2025). Functional olfactory impairment and fatigue in post-COVID-19 syndrome including ME/CFS – a longitudinal prospective observational study. Brain Behavior & Immunity - Health. 50. 101124–101124.

Briest, Franziska, Liliana H. Mochmann, Helma Freitag, et al.. (2024). Concomitant inhibition of PI3K/mTOR signaling pathways boosts antiproliferative effects of lanreotide in bronchopulmonary neuroendocrine tumor cells. Frontiers in Pharmacology. 15. 1308686–1308686. 2 indexed citations

Wittke, Kirsten, Claudia Kedor, Rebekka Rust, et al.. (2024). Efficacy of repeated immunoadsorption in patients with post-COVID myalgic encephalomyelitis/chronic fatigue syndrome and elevated β2-adrenergic receptor autoantibodies: a prospective cohort study. The Lancet Regional Health - Europe. 49. 101161–101161. 8 indexed citations

Kedor, Claudia, Rebekka Rust, Helma Freitag, et al.. (2024). Impaired Hand Grip Strength Correlates with Greater Disability and Symptom Severity in Post-COVID Myalgic Encephalomyelitis/Chronic Fatigue Syndrome. Journal of Clinical Medicine. 13(7). 2153–2153. 4 indexed citations

Meyer‐Arndt, Lil, Claudia Kedor, Helma Freitag, et al.. (2023). Long-term symptom severity and clinical biomarkers in post-COVID-19/chronic fatigue syndrome: results from a prospective observational cohort. EClinicalMedicine. 63. 102146–102146. 52 indexed citations

Wittke, Kirsten, Claudia Kedor, Helma Freitag, et al.. (2023). Observational Study of Repeat Immunoadsorption (RIA) in Post-COVID ME/CFS Patients with Elevated ß2-Adrenergic Receptor Autoantibodies—An Interim Report. Journal of Clinical Medicine. 12(19). 6428–6428. 9 indexed citations

Kedor, Claudia, Helma Freitag, Lil Meyer‐Arndt, et al.. (2022). A prospective observational study of post-COVID-19 chronic fatigue syndrome following the first pandemic wave in Germany and biomarkers associated with symptom severity. Nature Communications. 13(1). 5104–5104. 169 indexed citations breakdown →

Freitag, Helma, Gordon Rudolf, Martina Seifert, et al.. (2022). Endothelial dysfunction and altered endothelial biomarkers in patients with post-COVID-19 syndrome and chronic fatigue syndrome (ME/CFS). Journal of Translational Medicine. 20(1). 138–138. 168 indexed citations breakdown →

Scheibenbogen, Carmen, Franziska Sotzny, Jelka Hartwig, et al.. (2021). Tolerability and Efficacy of s.c. IgG Self-Treatment in ME/CFS Patients with IgG/IgG Subclass Deficiency: A Proof-of-Concept Study. Journal of Clinical Medicine. 10(11). 2420–2420. 7 indexed citations

10.

Sotzny, Franziska, Sandra Bauer, Helma Freitag, et al.. (2021). The SARS-CoV-2 receptor angiotensin-converting enzyme 2 (ACE2) in myalgic encephalomyelitis/chronic fatigue syndrome: A meta-analysis of public DNA methylation and gene expression data. Heliyon. 7(8). e07665–e07665. 7 indexed citations

11.

Freitag, Helma, S. Lorenz, Franziska Sotzny, et al.. (2021). Delineating the Association Between Soluble CD26 and Autoantibodies Against G-Protein Coupled Receptors, Immunological and Cardiovascular Parameters Identifies Distinct Patterns in Post-Infectious vs. Non-Infection-Triggered Myalgic Encephalomyelitis/Chronic Fatigue Syndrome. Frontiers in Immunology. 12. 644548–644548. 14 indexed citations

12.

Kedor, Claudia, Patricia Grabowski, Kirsten Wittke, et al.. (2021). Hand grip strength and fatigability: correlation with clinical parameters and diagnostic suitability in ME/CFS. Journal of Translational Medicine. 19(1). 159–159. 52 indexed citations

13.

Scheibenbogen, Carmen, Madlen Loebel, Helma Freitag, et al.. (2018). Immunoadsorption to remove ß2 adrenergic receptor antibodies in Chronic Fatigue Syndrome CFS/ME. PLoS ONE. 13(3). e0193672–e0193672. 76 indexed citations

14.

Nölting, Svenja, Helma Freitag, Katharina Detjen, et al.. (2017). The selective PI3Kα inhibitor BYL719 as a novel therapeutic option for neuroendocrine tumors: Results from multiple cell line models. PLoS ONE. 12(8). e0182852–e0182852. 28 indexed citations

15.

Briest, Franziska, Markus Möbs, Friederike Christen, et al.. (2017). Mechanisms of Targeting the MDM2-p53-FOXM1 Axis in Well-Differentiated Intestinal Neuroendocrine Tumors. Neuroendocrinology. 107(1). 1–23. 12 indexed citations

16.

Scheibenbogen, Carmen, Helma Freitag, Julià Blanco, et al.. (2017). The European ME/CFS Biomarker Landscape project: an initiative of the European network EUROMENE. Journal of Translational Medicine. 15(1). 162–162. 30 indexed citations

17.

Wittke, Kirsten, et al.. (2017). Influenza Vaccination in Patients with Common Variable Immunodeficiency (CVID). Current Allergy and Asthma Reports. 17(11). 78–78. 18 indexed citations

18.

Freitag, Helma, et al.. (2016). Inhibition of mTOR's Catalytic Site by PKI-587 Is a Promising Therapeutic Option for Gastroenteropancreatic Neuroendocrine Tumor Disease. Neuroendocrinology. 105(1). 90–104. 26 indexed citations

19.

Pusch, Franz, Helma Freitag, V. Goll, et al.. (2000). Electrical stimulation of the vestibular system prevents postoperative nausea and vomiting. Acta Anaesthesiologica Scandinavica. 44(9). 1145–1148. 7 indexed citations

20.

Pusch, Franz, Helma Freitag, C. Weinstabl, et al.. (1999). Single‐injection paravertebral block compared to general anaesthesia in breast surgery. Acta Anaesthesiologica Scandinavica. 43(7). 770–774. 152 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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