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Hospital / health system · Sofia · Bulgaria

National Heart Hospital

In research, National Heart Hospital stands highest in Medicine (#3,137 of 10,443 worldwide) and Health Sciences (#4,332 of 11,982 worldwide), 2022–2025. Relative to its size it is most specialised in Cardiology and Cardiovascular Medicine — Cardiology and Cardiovascular Medicine is 21.6× its share of world research.

hearthospital.bgROR OpenAlex
World rank, 2022–2025
#14,867
of 28,054 · #7,538 all time
Rank in Bulgaria
#35
of 92
Research works
1.4k
▲ 3% vs 2013–17
Citations
46k
32.3 per fractional work
Top-10% rate
6.5%
record average 16.5%
Open access
45%
world 28%

What is National Heart Hospital 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 #3,137 of 10,443 6.4%85 #1858
Health SciencesDomain #4,332 of 11,982 6.5%86 #2422

Each strip is that field’s whole ranked pool, with the notch where National Heart Hospital 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).

What does National Heart Hospital specialise in?

Where its research is concentrated relative to its size: Cardiology and Cardiovascular Medicine takes 21.6× the share of its output that it takes of world research.

  1. Cardiology and Cardiovascular MedicineSubfield · 22.9 works22×
← 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.

Biochemistry, Genetics and Molecular Biology: 0.60× its world share, 3 worksBiochemistry, Geneti…Immunology and Microbiology: 1.52× its world share, 2 worksImmunology and Micro…Neuroscience: 1.42× its world share, 2 worksNeuroscienceChemistry: 0.03× its world share, 0 worksChemistryComputer Science: 0.12× its world share, 1 worksComputer ScienceEngineering: 0.21× its world share, 3 worksEngineeringEnvironmental Science: 0.02× its world share, 0 worksEnvironmental ScienceMaterials Science: 0.14× its world share, 0 worksMaterials ScienceMathematics: 0.08× its world share, 0 worksMathematicsPhysics and Astronomy: 0.07× its world share, 0 worksPhysics and AstronomyHealth Professions: 0.58× its world share, 2 worksHealth ProfessionsMedicine: 4.36× its world share, 84 worksMedicineNursing: 0.48× its world share, 0 worksNursingArts and Humanities: 0.04× its world share, 0 worksArts and HumanitiesBusiness, Management and Accounting: 0.02× its world share, 0 worksBusiness, Management…Economics, Econometrics and Finance: 0.39× its world share, 1 worksEconomics, Econometr…Psychology: 0.14× its world share, 0 worksPsychologySocial Sciences: 0.07× 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, 4.4×. Every wedge is a field page.

Who are the top researchers at National Heart Hospital?

Ranked on the composite score, E. G. J. Olsen, Jane Somerville and Robert M. Donaldson lead among researchers whose main affiliation is National Heart Hospital.

  1. 1 E. G. J. Olsen Bulgaria · #15,832 worldwide 705 citations · 45 works
  2. 2 Jane Somerville Bulgaria · #51,945 worldwide 227 citations · 56 works
  3. 3 Robert M. Donaldson Bulgaria · #71,187 worldwide 226 citations · 36 works
  4. 4 P A Poole-Wilson Bulgaria · #94,497 worldwide 477 citations · 23 works
  5. 5 Krasimira Hristová Bulgaria · #163,021 worldwide 138 citations · 37 works
  6. 6 Nina Gotcheva Bulgaria · #271,905 worldwide 408 citations · 15 works
  7. 7 P. Wood Bulgaria · #308,768 worldwide 193 citations · 15 works
  8. 8 R Canepa‐Anson Bulgaria · #337,187 worldwide 87 citations · 21 works
  9. 9 A F Rickards Bulgaria · #344,020 worldwide 83 citations · 29 works
  10. 10 Dobrin Vassilev Bulgaria · #354,478 worldwide 105 citations · 25 works
All ranked researchers at National Heart Hospital

Which keywords describe research at National Heart Hospital?

By fractional works in 2022–2025, weighted toward what it does more of than the world: Echocardiography, Heart Failure, Diagnosis, Myocardial Infarction, Treatment, Epidemiology, Chronic Kidney Disease and Catheter Ablation.

▲ 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. Echocardiography10▲ 38×8 topics
  2. Epidemiology10▲ 2.5×38 topics
  3. Heart Failure8▲ 18×13 topics
  4. Diagnosis8▲ 8.3×16 topics
  5. Treatment7▲ 5.4×12 topics
  6. Myocardial Infarction6▲ 27×7 topics
  7. Chronic Kidney Disease6▲ 23×6 topics
  8. Cardiovascular Disease5▲ 4.7×16 topics
  9. Catheter Ablation5▲ 44×2 topics
  10. Guidelines5▲ 11×7 topics
  11. Neurodevelopmental Outcomes5▲ 27×3 topics
  12. Arrhythmias5▲ 53×2 topics
  13. Congenital Heart Disease5▲ 60×3 topics
  14. Cardiac Surgery5▲ 67×1 topic
  15. Mortality Risk5▲ 21×2 topics
  16. Pulmonary Valve Replacement5▲ 91×1 topic
  17. Pulmonary Hypertension5▲ 34×2 topics
  18. Treatment Guidelines5▲ 22×4 topics
  19. Endothelial Dysfunction5▲ 20×3 topics
  20. Obesity4▲ 5.9×8 topics
  21. Right Heart Assessment4▲ 112×1 topic
  22. Survival Prediction4▲ 112×1 topic
  23. Clinical Practice Guidelines4▲ 8.1×8 topics
  24. Prophylaxis4▲ 34×2 topics
  25. Cardiac Imaging4▲ 31×3 topics
  26. Cardiomyopathy4▲ 42×3 topics
  27. Coronary Artery Disease4▲ 31×3 topics
  28. Radiofrequency Ablation4▲ 34×2 topics
  29. Percutaneous Coronary Intervention3▲ 24×4 topics
  30. Antithrombotic Therapy3▲ 40×2 topics
  31. Surgery3▲ 8.9×5 topics
  32. Electroanatomic Mapping3▲ 63×1 topic
  33. Ventricular Tachycardia3▲ 63×1 topic
  34. Atrial Fibrillation3▲ 30×2 topics
  35. Deep Vein Thrombosis3▲ 38×2 topics
  36. Sudden Cardiac Death3▲ 36×2 topics
  37. Surgical Aortic-Valve Replacement3▲ 39×1 topic
  38. Thrombosis3▲ 10×5 topics
  39. Transcatheter Aortic-Valve Replacement3▲ 39×1 topic
  40. Magnetic Resonance Imaging3▲ 11×3 topics

Which research topics does National Heart Hospital publish most on?

By volume in 2022–2025: Congenital Heart Disease Studies, Pulmonary Hypertension Research and Treatments, Cardiac Arrhythmias and Treatments and Cardiac Valve Diseases and Treatments.

Congenital Heart Disease Studies: 5 fractional worksPulmonary Hypertension Research and Treatments: 4 fractional worksCardiac Arrhythmias and …3Cardiac Arrhythmias and Treatments: 3 fractional worksCardiac Valve Diseases a…3Cardiac Valve Diseases and Treatments: 3 fractional worksVenous Thromboembolism Diagnosis and Management: 2 fractional worksCardiac Imaging and Diagnostics: 2 fractional worksAtrial Fibrillation Mana…2Atrial Fibrillation Management and Outcomes: 2 fractional worksCardiovascular Function …2Cardiovascular Function and Risk Factors: 2 fractional worksCardiac Structural Anoma…2Cardiac Structural Anomalies and Repair: 2 fractional worksCardiac electrophysiolog…2Cardiac electrophysiology and arrhythmias: 2 fractional works
EpidemiologyPulmonary and Respiratory MedicineCardiology and Cardiovascular MedicineInternal Medicine2 others

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

  1. 1 Congenital Heart Disease Studies Epidemiology 5 works
  2. 2 Pulmonary Hypertension Research and Treatments Pulmonary and Respiratory Medicine 4 works
  3. 3 Cardiac Arrhythmias and Treatments Cardiology and Cardiovascular Medicine 3 works
  4. 4 Cardiac Valve Diseases and Treatments Cardiology and Cardiovascular Medicine 3 works
  5. 5 Venous Thromboembolism Diagnosis and Management Internal Medicine 2 works
  6. 6 Cardiac Imaging and Diagnostics Radiology, Nuclear Medicine and Imaging 2 works
  7. 7 Atrial Fibrillation Management and Outcomes Cardiology and Cardiovascular Medicine 2 works
  8. 8 Cardiovascular Function and Risk Factors Cardiology and Cardiovascular Medicine 2 works
  9. 9 Cardiac Structural Anomalies and Repair Surgery 2 works
  10. 10 Cardiac electrophysiology and arrhythmias Cardiology and Cardiovascular Medicine 2 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 available45.2%not open54.8%

World: 28% of research is openly available.

with international co-authors32.1%domestic only67.9%

World: 19% is written across borders.

How has National Heart Hospital's research output changed?

Output in 2018–2022 was 3% higher 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 Sofia

All research institutions in Sofia

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.