Treatment & Services
- Cardiovascular Imaging
- Cardiovascular Imaging Section
- Cardiovascular Medicine Department
- General Cardiology
- Heart Imaging
- Non-Invasive Diagnostic Testing
- Pericardial Diseases Center
- Stress Testing
Specialty in Diseases & Conditions
- Aorta Disease
- Aortic Aneurysms
- Aortic Occlusion (blockage)
- Aortic Regurgitation
- Aortic Stenosis
- Atherosclerosis (vascular)
- Atrial Fibrillation
- Atrial Septal Defects
- Cardiovascular Disease
- Cardiovascular Risk Prevention
- Congenital Valve Disease
- Coronary Artery Disease
- Heart Attack
- Heart Disease
- Heart Murmur
- Heart Related Illnesses
- Heart Valve Disease
- Heart Valve Infections
- High Cholesterol
- Hypertension - High Blood Pressure
- Marfan Syndrome
- Mitral Valve Prolapse
- Mitral Valve Regurgitation
- Mitral Valve Stenosis
- Pericardial Cyst
- Pericardial Disease
- Pericardial Effusion
- Pulmonary Valve Disease
- Pulmonary Valve Stenosis
- Restrictive Cardiomyopathy
- Rheumatic Heart Disease
- Tricuspid Valve Disease
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Education & Professional Highlights
Education & Fellowships
Fellowship - Mayo Clinic
Rochester, MN USA
Residency - University of Ottawa Heart Institute
Residency - Royal Victoria Hospital
Internship - Mount Sinai Hospital
Medical School - McGill University Faculty of Medicine
Undergraduate - McGill University
- Participant in the Cleveland Clinic's Cardiovascular CT Training Program in March, 2006 (Level II certification)
- Participant at the 5th Annual Cardiovascular Magnetic Resonance & Computed Tomography Conference, June,2007. Effective January 2, 2008, met the Level 2 requirements for training in Cardiac CT (CCT) based on the ACCF/AHA Clinical Competency Statement on Cardiac Imaging with Computed Tomography and Magnetic Resonance
- 2007: Grand Rounds presentation at Massachusetts General Hospital on "New Advances in Echocardiography in Atrial Fibrillation: What's New in the LAA and Pulmonary Veins?"
- 2006: Publication of “The use of enoxaparin compared with unfractionated heparin for short-term antithrombotic therapy in atrial fibrillation patients undergoing transesophageal echocardiography-guided cardioversion: Assessment of Cardioversion Using Transesophageal Echocardiography (ACUTE) II randomized multicentre study” in the European Heart Journal
- 2006: Key note speaker on "New Advances in Echocardiography in Atrial Fibrillation" in Rome at the X World Congress of Echocardiography & Cardiovascular Imaging Conference
- 2004: Publication of “Pericarditis” in The Lancet
- 2001: Publication of “Use of transesophageal echocardiography to guide cardioversion in patients with atrial fibrillation” in the New England Journal of Medicine
- Internal Medicine
- Internal Medicine - Cardiovascular Disease
Amyloidosis, Heart Valve Disease, Pericardial Disease, Pericarditis, Cardiovascular imaging, Echocardiogram, Non-invasive Diagnostic Testing
Awards & Honors
- Fellowships: American College of Cardiology, Royal College of Physicians (Canada), American Society of Echocardiography, American Heart Association
- Principal Investigator for harmonic imaging of the left atrial appendage with atrial fibrillation study (CLOTS)
- Principal Investigator for the ACUTE II Low Molecular Weight Heparin study
- Principal Investigator for A Pilot Phase 3, International, Multicenter, Open-label, Dual Injection,
- Myocardial Imaging and Safety Study of AI-700 in patients with Suspected Ischemic Heart Disease
- Principal Investigator for the American Society of Echo. Research Award for “Predication of Responses to Beta-Blocker Therapy in Heart Failure Using Doppler Filling Patterns of the Left Ventricle”
- Principal Investigator for the American Society of Echo. Outcomes Award. The Role of Transesophageal Echocardiography in Pulmonary Vein Ablation: Comparison with Computed Tomography: The ROTEA Study
- Principal Investigator. Low Molecular Weight Heparin in Bridging Patients after Mechanical Valve Replacement. (ABRIDGE MVR Study)
Innovations & Patents
- Dr. Klein has pioneered the use of transesophageal-guided cardioversion in patients with atrial fibrillation in his landmark paper in the New England Journal of Medicine published in 2001 and the European Heart Journal in 2006.
He is also the Director of the echocardiographic symposiums entitled Diastology and New Echo Technologies and is the editor of a book entitled "Diastology: Clinical Approach to Diastolic Heart Failure."
- American Society of Echocardiography
- American Heart Association
- American College of Cardiology
- Royal College of Physicians
- Society of Cardiovascular Computed Tomography
Research & Publications
(Disclaimer: This search is powered by PubMed, a service of the U.S. National Library of Medicine. PubMed is a third-party website with no affiliation with Cleveland Clinic.)
Cleveland Clinic physicians and scientists may collaborate with the pharmaceutical or medical device industries to help develop medical breakthroughs or provide medical expertise or education. Cleveland Clinic strives to make scientific advances that will benefit patient care and support outside relationships that promise public benefit. In order for the discoveries of Cleveland Clinic physicians' and scientists' laboratories and investigations to benefit the public, these discoveries must be commercialized in partnership with industry. As experts in their fields, Cleveland Clinic physicians and scientists are often sought after by industry to consult, provide expertise and education.
To assure professional and commercial integrity in such matters, Cleveland Clinic maintains a program that reviews these collaborations and, when appropriate, puts measures in place to minimize bias that may result from ties to industry. Cleveland Clinic publicly discloses the names of companies when (i) its physicians/scientists receive $5,000 or more per year (or, in rare cases, equity or stock options) for speaking and consulting, (ii) its physicians/scientists serve as a fiduciary, (iii) its physicians/scientists receive or have the right to receive royalties or (iv) its physicians/ scientists hold any equity interest for the physician's/scientist's role as inventor, discoverer, developer, founder or consultant.* In publicly disclosing this information, Cleveland Clinic tries to provide information as accurately as possible about its physicians' and scientists' connections with industry.
As of 5/5/2017, Dr. Klein has reported no financial relationship with industry that is applicable to this listing. In general, patients should feel free to contact their doctor about any of the relationships and how the relationships are overseen by Cleveland Clinic. To learn more about Cleveland Clinic's policies on collaborations with industry and innovation management, go to our Integrity in Innovation page.
Public Health Service-Reportable Financial Conflicts of Interest. Cleveland Clinic scientists and physicians engage in basic, translational and clinical research activities, working to solve health problems, enhance patient care and improve quality of life for patients. Interactions with industry are essential to bringing the researchers' discoveries to the public, but can present the potential for conflicts of interest related to their research activities. Click here to view a listing of instances where Cleveland Clinic has identified a Public Health Service (PHS)-Reportable Financial Conflict of Interest and has put measures in place to ensure that, to the extent possible, the design, conduct and reporting of the research is free from bias.
* Cleveland Clinic physicians and scientists subscribe to the guidance presented in the PhRMA Code on Interactions with Healthcare Professionals and the AdvaMed Code of Ethics on Interactions with Health Care Professionals. As such, gifts of substantial value are generally prohibited.
109 Patient Satisfaction Reviews
The Patient Satisfaction Rating is an average of all responses to the care provider related questions shown below from our nationally-recognized Press Ganey Patient Satisfaction Survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.
Responses are measured on a scale of 1 to 5 with 5 being the best score.
The comments are submitted by patients and reflect their views and opinions. The comments are not endorsed by and do not necessarily reflect the views of Cleveland Clinic.
|Courtesy, Respect & Concern||4.9|
|Knows Medical History||4.6|
|Time Spent with Patient||4.7|
|Patient Rating of Doctor||4.8|
21 Patient Comments
Reviewed on May 31, 2017
I received good news from Dr. Klein about my cardiac health. He made sure that I knew to follow up with non-cardiac issues about which I had solicited his input.
Reviewed on Apr 27, 2017
Dr. Klein was great and very acknowledgeable would have like to have a bit more time to discuss my situation.
Reviewed on Apr 13, 2017
Efficent... helpful and pleasant.
Reviewed on Mar 30, 2017
Dr. Klein (Allan L.) is the greatest!
Reviewed on Mar 15, 2017
Yes very good, even in trying new pain management.
Reviewed on Mar 1, 2017
Treated me as a partner in my health care decision making.
Reviewed on Feb 23, 2017
I love Dr. Klein. He's an incredible physician.
Reviewed on Feb 8, 2017
Reviewed on Jan 18, 2017
Reviewed on Jan 18, 2017
Excellent overall. Grateful to have Dr. Klein looking after my recurrent pericarditis.
Reviewed on Dec 22, 2016
He was very knowledgeable, caring and thorough. He made sure to include me in the decision making process and made sure all my questions were answered.
Reviewed on Nov 10, 2016
Dr. Klein is outstanding physician. He is very knowledgeable. He is world renowned in the field of pericarditis.
Reviewed on Nov 10, 2016
Very inclusive with my husband who was present during the appointment. Dr. Klein has excellent communication skills!
Reviewed on Nov 7, 2016
Incredibly pleased with every aspect of my experience at the clinic. Would highly recommend family, friends & loved ones.
Reviewed on Oct 27, 2016
Told needed Pericardial window, but Doctor was behind and had little time to discuss it and he said he was running behind. I really appreciate Dr. Klein, but I had come all the way from Arkansas. Also he had few of my tests results back and could not discuss them. He had the ECHO results only. I went away not sure of what I should consider. Felt so rushed and not a complete view of my issues.
Reviewed on Oct 27, 2016
DrKlein is very thorough and knowledgeable and professional I believe he is the best cardiologist the clinic has. If there were such a thing as a 'cardiologist' store I'd reach right to the top shelf and hand pick Dr Klein. I wish I could give him a higher rating than a 10.
Reviewed on Oct 13, 2016
Dr. Klein has been my cardiologist for 25+ years. I trust him.
Reviewed on Sep 29, 2016
Dr. Allan Klein is outstanding! He saved my life and I hold him in the highest regard!!!
Reviewed on Sep 28, 2016
Reviewed on Sep 1, 2016
very caring and professional
Reviewed on Aug 10, 2016
Everything went very well.
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