Johan Virhammar

1.9k total citations
38 papers, 1.2k citations indexed

About

Johan Virhammar is a scholar working on Neurology, Cellular and Molecular Neuroscience and Pediatrics, Perinatology and Child Health. According to data from OpenAlex, Johan Virhammar has authored 38 papers receiving a total of 1.2k indexed citations (citations by other indexed papers that have themselves been cited), including 35 papers in Neurology, 26 papers in Cellular and Molecular Neuroscience and 12 papers in Pediatrics, Perinatology and Child Health. Recurrent topics in Johan Virhammar's work include Cerebrospinal fluid and hydrocephalus (26 papers), Traumatic Brain Injury and Neurovascular Disturbances (20 papers) and Fetal and Pediatric Neurological Disorders (12 papers). Johan Virhammar is often cited by papers focused on Cerebrospinal fluid and hydrocephalus (26 papers), Traumatic Brain Injury and Neurovascular Disturbances (20 papers) and Fetal and Pediatric Neurological Disorders (12 papers). Johan Virhammar collaborates with scholars based in Sweden, United Kingdom and United States. Johan Virhammar's co-authors include Katarina Laurell, Elna‐Marie Larsson, Kristina Giuliana Cesarini, David Fällmar, Elham Rostami, Eva Kumlien, Robert Frithiof, Henrik Zetterberg, Lars Söderström and Karin Kockum and has published in prestigious journals such as SHILAP Revista de lepidopterología, PLoS ONE and American Journal of Psychiatry.

In The Last Decade

Johan Virhammar

37 papers receiving 1.2k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Johan Virhammar Sweden 20 907 723 395 226 197 38 1.2k
Judith Dobesberger Austria 26 263 0.3× 780 1.1× 1.4k 3.5× 153 0.7× 53 0.3× 54 2.2k
William B. Gallentine United States 20 345 0.4× 199 0.3× 404 1.0× 197 0.9× 43 0.2× 50 1.2k
Markus Leitinger Austria 25 273 0.3× 751 1.0× 1.2k 3.0× 206 0.9× 18 0.1× 53 2.1k
Elsa Kaphan France 17 1.1k 1.2× 221 0.3× 34 0.1× 191 0.8× 38 0.2× 45 1.5k
Pi‐Lien Hung Taiwan 16 151 0.2× 262 0.4× 213 0.5× 48 0.2× 64 0.3× 48 839
Gudrun Kalss Austria 16 165 0.2× 537 0.7× 937 2.4× 123 0.5× 26 0.1× 33 1.4k
Julia Höfler Austria 23 182 0.2× 837 1.2× 1.4k 3.5× 177 0.8× 13 0.1× 41 2.1k
Jimmy W. Huh United States 21 807 0.9× 132 0.2× 253 0.6× 19 0.1× 28 0.1× 63 1.2k
David Fällmar Sweden 14 466 0.5× 105 0.1× 32 0.1× 213 0.9× 19 0.1× 36 723
Clio Rubiños United States 16 306 0.3× 132 0.2× 108 0.3× 104 0.5× 10 0.1× 57 954

Countries citing papers authored by Johan Virhammar

Since Specialization
Citations

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

Fields of papers citing papers by Johan Virhammar

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Johan Virhammar

This figure shows the co-authorship network connecting the top 25 collaborators of Johan Virhammar. A scholar is included among the top collaborators of Johan Virhammar 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 Johan Virhammar. Johan Virhammar 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.
Ekblom, Maria, Dag Nyholm, Lena Zetterberg, Katarina Laurell, & Johan Virhammar. (2025). Blinded gait assessment in idiopathic normal pressure hydrocephalus: reliability and correlation with clinical and patient-reported outcomes. Fluids and Barriers of the CNS. 22(1). 91–91.
2.
Virhammar, Johan, et al.. (2025). Chronic, Shunt-Dependent Hydrocephalus in Aneurysmal Subarachnoid Hemorrhage: Incidence, Risk Factors, Clinical Phenotypes, and Outcome. World Neurosurgery. 196. 123806–123806. 1 indexed citations
3.
Virhammar, Johan, et al.. (2025). When and how are complications suspected after shunt surgery in patients with normal pressure hydrocephalus?. Acta Neurochirurgica. 167(1). 6–6. 1 indexed citations
4.
Papadimitriou, Stergios, Dag Nyholm, Lena Kilander, et al.. (2024). Quantitative brain stem assessment in discriminating neurodegenerative disorders from normal pressure hydrocephalus. Journal of Neuroimaging. 34(5). 612–618. 1 indexed citations
5.
Edén, Arvid, Janet L. Cunningham, Jonas Bergquist, et al.. (2024). Central and peripheral kynurenine pathway metabolites in COVID-19: Implications for neurological and immunological responses. Brain Behavior and Immunity. 124. 163–176. 3 indexed citations
6.
Taxiarchis, Apostolos, Bo‐Michael Bellander, Jovan P. Antović, et al.. (2023). Extracellular vesicles in plasma and cerebrospinal fluid in patients with COVID‐19 and neurological symptoms. International Journal of Laboratory Hematology. 46(1). 42–49. 5 indexed citations
7.
Boström, Gustaf, Martin Ingelsson, Lena Kilander, et al.. (2023). Levels of inflammatory cytokines MCP-1, CCL4, and PD-L1 in CSF differentiate idiopathic normal pressure hydrocephalus from neurodegenerative diseases. Fluids and Barriers of the CNS. 20(1). 72–72. 16 indexed citations
8.
Cunningham, Janet L., Jan Mulder, Amalia Feresiadou, et al.. (2023). Myoclonus in patients with COVID‐19: Findings of autoantibodies against brain structures in cerebrospinal fluid. European Journal of Neurology. 30(10). 3142–3148. 2 indexed citations
9.
Fällmar, David, Elham Rostami, Eva Kumlien, et al.. (2021). The extent of neuroradiological findings in COVID-19 shows correlation with blood biomarkers, Glasgow coma scale score and days in intensive care. Journal of Neuroradiology. 49(6). 421–427. 12 indexed citations
10.
Frithiof, Robert, Elham Rostami, Eva Kumlien, et al.. (2021). Critical illness polyneuropathy, myopathy and neuronal biomarkers in COVID-19 patients: A prospective study. Clinical Neurophysiology. 132(7). 1733–1740. 85 indexed citations
11.
12.
Kockum, Karin, Johan Virhammar, Katrine Riklund, et al.. (2020). Diagnostic accuracy of the iNPH Radscale in idiopathic normal pressure hydrocephalus. PLoS ONE. 15(4). e0232275–e0232275. 38 indexed citations
13.
Virhammar, Johan, David Fällmar, Janet L. Cunningham, et al.. (2020). Biomarkers for central nervous system injury in cerebrospinal fluid are elevated in COVID‐19 and associated with neurological symptoms and disease severity. European Journal of Neurology. 28(10). 3324–3331. 95 indexed citations
14.
Kockum, Karin, Johan Virhammar, Katrine Riklund, et al.. (2019). Standardized image evaluation in patients with idiopathic normal pressure hydrocephalus: consistency and reproducibility. Neuroradiology. 61(12). 1397–1406. 29 indexed citations
15.
Virhammar, Johan, Katarina Laurell, André Ahlgren, & Elna‐Marie Larsson. (2017). Arterial Spin-Labeling Perfusion MR Imaging Demonstrates Regional CBF Decrease in Idiopathic Normal Pressure Hydrocephalus. American Journal of Neuroradiology. 38(11). 2081–2088. 36 indexed citations
16.
Virhammar, Johan & Dag Nyholm. (2016). Levodopa-carbidopa enteral suspension in advanced Parkinson’s disease: clinical evidence and experience. Therapeutic Advances in Neurological Disorders. 10(3). 171–187. 25 indexed citations
17.
Virhammar, Johan, J. B. M. Warntjes, Katarina Laurell, & Elna‐Marie Larsson. (2015). Quantitative MRI for Rapid and User-Independent Monitoring of Intracranial CSF Volume in Hydrocephalus. American Journal of Neuroradiology. 37(5). 797–801. 17 indexed citations
18.
Virhammar, Johan, Katarina Laurell, Kristina Giuliana Cesarini, & Elna‐Marie Larsson. (2014). Preoperative Prognostic Value of MRI Findings in 108 Patients with Idiopathic Normal Pressure Hydrocephalus. American Journal of Neuroradiology. 35(12). 2311–2318. 121 indexed citations
19.
Virhammar, Johan, Katarina Laurell, André Ahlgren, Kristina Giuliana Cesarini, & Elna‐Marie Larsson. (2014). Idiopathic Normal Pressure Hydrocephalus: Cerebral Perfusion Measured with pCASL before and Repeatedly after CSF Removal. Journal of Cerebral Blood Flow & Metabolism. 34(11). 1771–1778. 32 indexed citations
20.
Virhammar, Johan, Kristina Giuliana Cesarini, & Katarina Laurell. (2011). The CSF tap test in normal pressure hydrocephalus: evaluation time, reliability and the influence of pain. European Journal of Neurology. 19(2). 271–276. 56 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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