Alfred Callahan

2.7k total citations
37 papers, 1.9k citations indexed

About

Alfred Callahan is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Epidemiology. According to data from OpenAlex, Alfred Callahan has authored 37 papers receiving a total of 1.9k indexed citations (citations by other indexed papers that have themselves been cited), including 18 papers in Surgery, 18 papers in Pulmonary and Respiratory Medicine and 15 papers in Epidemiology. Recurrent topics in Alfred Callahan's work include Lipoproteins and Cardiovascular Health (18 papers), Cerebrovascular and Carotid Artery Diseases (17 papers) and Acute Ischemic Stroke Management (15 papers). Alfred Callahan is often cited by papers focused on Lipoproteins and Cardiovascular Health (18 papers), Cerebrovascular and Carotid Artery Diseases (17 papers) and Acute Ischemic Stroke Management (15 papers). Alfred Callahan collaborates with scholars based in United States, Denmark and Germany. Alfred Callahan's co-authors include Michael G. Hennerici, Pierre Amarenco, Henrik Sillesen, Justin A. Zivin, K.M.A. Welch, Larry B. Goldstein, Michael Szarek, Amy E. Rudolph, Michael Messig and Liav Goldstein and has published in prestigious journals such as Circulation, Journal of the American College of Cardiology and Neurology.

In The Last Decade

Alfred Callahan

36 papers receiving 1.8k citations

Peers

Alfred Callahan
Enrico Floßmann United Kingdom
D.P. Mikhailidis United Kingdom
Amy E. Rudolph United States
Magnus Settergren Sweden
Shafi Mussa United Kingdom
Xingyang Yi China
Giovanni M. Puddu Italy
Norifumi Metoki Japan
Winfried Maerz Germany
Tapio Utriainen Finland
Enrico Floßmann United Kingdom
Alfred Callahan
Citations per year, relative to Alfred Callahan Alfred Callahan (= 1×) peers Enrico Floßmann

Countries citing papers authored by Alfred Callahan

Since Specialization
Citations

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

Fields of papers citing papers by Alfred Callahan

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Alfred Callahan

This figure shows the co-authorship network connecting the top 25 collaborators of Alfred Callahan. A scholar is included among the top collaborators of Alfred Callahan 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 Alfred Callahan. Alfred Callahan 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
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Szarek, Michael, Pierre Amarenco, Alfred Callahan, et al.. (2020). Atorvastatin Reduces First and Subsequent Vascular Events Across Vascular Territories. Journal of the American College of Cardiology. 75(17). 2110–2118. 26 indexed citations
3.
Ovbiagele, Bruce, Larry B. Goldstein, Pierre Amarenco, et al.. (2014). Prediction of Major Vascular Events after Stroke: The Stroke Prevention by Aggressive Reduction in Cholesterol Levels Trial. Journal of Stroke and Cerebrovascular Diseases. 23(4). 778–784. 6 indexed citations
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Amarenco, Pierre, Larry B. Goldstein, Henrik Sillesen, et al.. (2010). Coronary Heart Disease Risk in Patients With Stroke or Transient Ischemic Attack and No Known Coronary Heart Disease. Stroke. 41(3). 426–430. 36 indexed citations
6.
Murphy, Clare, André L. Churchwell, Alfred Callahan, et al.. (2010). POTENTIAL IMPACT OF POOR PATIENT EDUCATION MATERIALS ON CARDIOVASCULAR OUTCOMES. Journal of the American College of Cardiology. 55(10). A142.E1331–A142.E1331. 1 indexed citations
7.
Sampson, Uchechukwu K.A., et al.. (2010). CAROTID ARTERY INTIMA-MEDIA THICKNESS (CIMT) ACCRETION RATE AND RISK OF ATHEROGENESIS IN A PRIMARY PREVENTION POPULATION. Journal of the American College of Cardiology. 55(10). A156.E1461–A156.E1461. 1 indexed citations
8.
Amarenco, Pierre, Oscar Benavente, Larry B. Goldstein, et al.. (2009). Results of the Stroke Prevention by Aggressive Reduction in Cholesterol Levels (SPARCL) Trial by Stroke Subtypes. Stroke. 40(4). 1405–1409. 177 indexed citations
9.
Sillesen, Henrik, Pierre Amarenco, Michael G. Hennerici, et al.. (2008). Atorvastatin Reduces the Risk of Cardiovascular Events in Patients With Carotid Atherosclerosis. Stroke. 39(12). 3297–3302. 173 indexed citations
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Campese, Vito M., Alfred Callahan, Amy E. Rudolph, et al.. (2007). Abstract 2173: Effect of High-dose Atorvastatin on Changes in Renal Function: A Secondary Analysis of the Stroke Prevention by Aggressive Reduction of Cholesterol Levels (SPARCL) Trial. Circulation. 116. 1 indexed citations
12.
Kirshner, Howard S., José Biller, & Alfred Callahan. (2005). Long-Term Therapy to Prevent Stroke. The Journal of the American Board of Family Medicine. 18(6). 528–540. 17 indexed citations
13.
Callahan, Alfred. (2003). Vascular pleiotropy of statins: Clinical evidence and biochemical mechanisms. Current Atherosclerosis Reports. 5(1). 33–37. 12 indexed citations
14.
Callahan, Alfred. (2001). Cerebrovascular disease and statins: a potential addition to the therapeutic armamentarium for stroke prevention. The American Journal of Cardiology. 88(7). 33–37. 26 indexed citations
15.
Callahan, Alfred, et al.. (2001). Possible Short‐term Amelioration of Basilar Plaque by High‐Dose Atorvastatin: Use of Reductase Inhibitors for Intracranial Plaque Stabilization. Journal of Neuroimaging. 11(2). 202–204. 4 indexed citations
16.
Callahan, Alfred, et al.. (2000). Basilar Artery Endoprosthesis Placement: Rescue Therapy for Recurrent Thrombosis. Journal of Neuroimaging. 10(1). 47–48. 8 indexed citations
17.
Callahan, Alfred, et al.. (1997). Balloon Angioplasty of lntracranial Arteries for Stroke Prevention. Journal of Neuroimaging. 7(4). 232–235. 42 indexed citations
18.
Palmer, Gene C., et al.. (1985). Classification of ischemic-induced damage to Na+, K+-ATPase in gerbil forebrain. Neuropharmacology. 24(6). 509–516. 30 indexed citations
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Palmer, Gene C., et al.. (1984). Regional cyclic AMP systems during secondary ischemia in gerbils: Influence of anesthetic agents. Experimental Neurology. 84(3). 494–511. 13 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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