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Hospital / health system · Athens · Greece

Onassis Cardiac Surgery Center

In research, Onassis Cardiac Surgery Center stands highest in Medicine (#6,223 of 10,443 worldwide), Health Sciences (#7,917 of 11,982 worldwide) and Cardiology and Cardiovascular Medicine (#632 of 738 worldwide), 2022–2025. Relative to its size it is most specialised in Cardiology and Cardiovascular Medicine — Cardiology and Cardiovascular Medicine is 35.2× its share of world research.

onasseio.gr/onaseioROR OpenAlex
World rank, 2022–2025
#18,231
of 28,054 · #18,739 all time
Rank in Greece
#87
of 124
Research works
1.3k
▼ 11% vs 2013–17
Citations
23k
17.9 per fractional work
Top-10% rate
12.5%
record average 16.5%
Open access
41%
world 28%

What is Onassis Cardiac Surgery Center known for in research?

The fields where it stands highest, 2022–2025, ranked among every institution above the floor in each field.

FieldWorld rankWhere that sitsTop-10% rateWorksAll time
MedicineField #6,223 of 10,443 13.0%138 #5155
Health SciencesDomain #7,917 of 11,982 12.8%142 #6674
Cardiology and Cardiovascular MedicineSubfield #632 of 738 12.1%62 #907

Each strip is that field’s whole ranked pool, with the notch where Onassis Cardiac Surgery Center sits in it, in the colour of the band that rank falls in. The track under the rate is the rate itself: it carries no world mark, because the world rate differs by field (from about 6% to 21% in this record).

Which of those standings moved

The same fields on both windows: where it stood over the whole record, and where it stands in 2022–2025. The distance is the story, and it is the one thing the two rank columns above cannot show.

  1. Medicine#5,155 #6,223
  2. Health Sciences#6,674 #7,917
  3. Cardiology and Cardiovascular Medicine#907 #632
all time2022–2025, better2022–2025, worse

A dot further right is a better standing. Fields it was not ranked in over the whole record are left out.

What does Onassis Cardiac Surgery Center specialise in?

Where its research is concentrated relative to its size: Cardiology and Cardiovascular Medicine takes 35.2× the share of its output that it takes of world research.

  1. Cardiology and Cardiovascular MedicineSubfield · 62.0 works35×
← less than its size predicts1×more →

Location quotient, a volume reading rather than an impact one. It surfaces small, lopsided specialities.

Field profile

Location quotient across every field it publishes in: outside the ring is more than an institution of this size would be expected to publish, inside it is less.

Agricultural and Biological Sciences: 0.07× its world share, 1 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 0.96× its world share, 9 worksBiochemistry, Geneti…Immunology and Microbiology: 0.72× its world share, 1 worksImmunology and Micro…Neuroscience: 0.18× its world share, 0 worksNeurosciencePharmacology, Toxicology and Pharmaceutics: 0.75× its world share, 0 worksPharmacology, Toxico…Chemistry: 0.22× its world share, 1 worksChemistryComputer Science: 0.13× its world share, 2 worksComputer ScienceEarth and Planetary Sciences: 0.16× its world share, 0 worksEarth and Planetary …Engineering: 0.29× its world share, 7 worksEngineeringEnvironmental Science: 0.08× its world share, 1 worksEnvironmental ScienceDentistry: 0.07× its world share, 0 worksDentistryHealth Professions: 0.69× its world share, 3 worksHealth ProfessionsMedicine: 4.27× its world share, 138 worksMedicineNursing: 1.26× its world share, 1 worksNursingArts and Humanities: 0.20× its world share, 1 worksArts and HumanitiesDecision Sciences: 0.10× its world share, 0 worksDecision SciencesEconomics, Econometrics and Finance: 0.15× its world share, 0 worksEconomics, Econometr…Psychology: 0.26× its world share, 1 worksPsychologySocial Sciences: 0.05× its world share, 1 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

Rings at 0.5×, 1× and 2×. Widest outward: Medicine, 4.3×. Every wedge is a field page.

Who are the top researchers at Onassis Cardiac Surgery Center?

Ranked on the composite score, Stamatis Adamopoulos, Genovefa Kolovou and George Theodorakis lead among researchers whose main affiliation is Onassis Cardiac Surgery Center.

  1. 1 Stamatis Adamopoulos Greece · #32,976 worldwide 319 citations · 42 works
  2. 2 Genovefa Kolovou Greece · #226,086 worldwide 294 citations · 110 works
  3. 3 George Theodorakis Greece · #250,876 worldwide 110 citations · 18 works
  4. 4 George Athanassopoulos Greece · #304,699 worldwide 188 citations · 16 works
  5. 5 Stefanos Geroulanos Greece · #312,266 worldwide 29 citations · 25 works
  6. 6 Sophie Mavrogeni Greece · #363,956 worldwide 92 citations · 37 works
  7. 7 Gregory Pavlides Greece · #424,946 worldwide 78 citations · 22 works
  8. 8 Dennis V. Cokkinos Greece · #484,230 worldwide 170 citations · 95 works
  9. 9 Efthimios Livanis Greece · #675,178 worldwide 45 citations · 15 works
  10. 10 S Geroulanos Greece · #679,027 worldwide 27 citations · 17 works
All ranked researchers at Onassis Cardiac Surgery Center

Which keywords describe research at Onassis Cardiac Surgery Center?

By fractional works in 2022–2025, weighted toward what it does more of than the world: Heart Failure, Echocardiography, Catheter Ablation, Myocardial Infarction, Arrhythmias, Guidelines, Atrial Fibrillation and Cardiomyopathy.

▲ more of its work than of the world’s◆ about the world’s share▼ less than the world’s

Size is fractional works in 2022–2025 in the topics tagged with each word; colour is the word's share of this institution's work against its share of the world's. The 40 words are chosen for being large and distinctive. Each links to the topic it comes from most.

All 40 words, with their numbers
  1. Heart Failure23▲ 32×12 topics
  2. Echocardiography22▲ 47×7 topics
  3. Catheter Ablation16▲ 78×2 topics
  4. Myocardial Infarction14▲ 35×7 topics
  5. Arrhythmias14▲ 87×2 topics
  6. Guidelines12▲ 15×5 topics
  7. Atrial Fibrillation10▲ 63×2 topics
  8. Treatment10▲ 4.9×16 topics
  9. Cardiomyopathy10▲ 64×3 topics
  10. Dilated Cardiomyopathy10▲ 82×2 topics
  11. Sudden Cardiac Death9▲ 67×2 topics
  12. Cardiac Imaging9▲ 45×3 topics
  13. Radiofrequency Ablation9▲ 51×1 topic
  14. Ventricular Tachycardia9▲ 107×1 topic
  15. Diagnosis9▲ 5.6×11 topics
  16. Obesity9▲ 6.9×9 topics
  17. Cardiovascular Disease9▲ 4.6×23 topics
  18. Congenital Heart Disease8▲ 58×3 topics
  19. Genetic Mutations8▲ 11×7 topics
  20. Coronary Artery Disease8▲ 40×3 topics
  21. Surgical Aortic-Valve Replacement8▲ 63×1 topic
  22. Transcatheter Aortic-Valve Replacement8▲ 63×1 topic
  23. Endovascular Repair7▲ 52×3 topics
  24. Stroke Prevention7▲ 36×2 topics
  25. Cardiac Surgery7▲ 57×2 topics
  26. Neurodevelopmental Outcomes7▲ 22×2 topics
  27. Thrombosis7▲ 15×4 topics
  28. Anticoagulant Therapy7▲ 33×1 topic
  29. Mortality Risk7▲ 17×4 topics
  30. Risk Stratification7▲ 57×1 topic
  31. Percutaneous Coronary Intervention7▲ 30×4 topics
  32. Adult Congenital Heart Disease7▲ 74×1 topic
  33. Pulmonary Valve Replacement7▲ 74×1 topic
  34. Extracorporeal Membrane Oxygenation7▲ 51×2 topics
  35. Magnetic Resonance Imaging6▲ 15×3 topics
  36. Cardiovascular Risk6▲ 12×5 topics
  37. Surgical Repair6▲ 87×1 topic
  38. Ventricular Reconstruction6▲ 87×1 topic
  39. Cardiogenic Shock6▲ 75×1 topic
  40. Left Ventricular Assist Device6▲ 75×1 topic

Which research topics does Onassis Cardiac Surgery Center publish most on?

By volume in 2022–2025: Cardiac Arrhythmias and Treatments, Cardiac Valve Diseases and Treatments, Atrial Fibrillation Management and Outcomes and Congenital Heart Disease Studies.

Cardiac Arrhythmias and …9Cardiac Arrhythmias and Treatments: 9 fractional worksCardiac Valve Diseases a…8Cardiac Valve Diseases and Treatments: 8 fractional worksAtrial Fibrillation Management and Outcomes: 7 fractional worksCongenital Heart Disease Studies: 7 fractional worksCardiac Structural Anomalies and Repair: 6 fractional worksMechanical Circulatory Support Devices: 6 fractional worksCardiovascular Function and Risk Factors: 6 fractional worksCardiac Imaging and Diag…5Cardiac Imaging and Diagnostics: 5 fractional worksAortic Disease and Treatment Approaches: 5 fractional worksCardiac pacing and defibrillation studies: 5 fractional works
Cardiology and Cardiovascular MedicineEpidemiologySurgeryBiomedical Engineering2 others

Area is fractional works; colour is the subfield each topic belongs to.

  1. 1 Cardiac Arrhythmias and Treatments Cardiology and Cardiovascular Medicine 9 works
  2. 2 Cardiac Valve Diseases and Treatments Cardiology and Cardiovascular Medicine 8 works
  3. 3 Atrial Fibrillation Management and Outcomes Cardiology and Cardiovascular Medicine 7 works
  4. 4 Congenital Heart Disease Studies Epidemiology 7 works
  5. 5 Cardiac Structural Anomalies and Repair Surgery 6 works
  6. 6 Mechanical Circulatory Support Devices Biomedical Engineering 6 works
  7. 7 Cardiovascular Function and Risk Factors Cardiology and Cardiovascular Medicine 6 works
  8. 8 Cardiac Imaging and Diagnostics Radiology, Nuclear Medicine and Imaging 5 works
  9. 9 Aortic Disease and Treatment Approaches Pulmonary and Respiratory Medicine 5 works
  10. 10 Cardiac pacing and defibrillation studies Cardiology and Cardiovascular Medicine 5 works

How open and international is its research?

Against the world’s own shares — the tick on each track. Both are shares of its output, so they sit on one scale and can be read against each other as well as against the world.

openly available41.3%not open58.7%

World: 28% of research is openly available.

with international co-authors16.1%domestic only83.9%

World: 19% is written across borders.

How has Onassis Cardiac Surgery Center's research output changed?

Output in 2018–2022 was 11% lower than in 2013–2017.

1990200020102020
grewheldshrank

The same series as a ribbon — one cell per year, darker for more. The line above answers how much; this answers when.

Other research institutions in Athens

All research institutions in Athens

Research measures only: rankings here say nothing about teaching, admissions or student experience. Comparable institutions and collaboration partners are in the interactive view on the map.