Mariko W. Harper
Advanced in His Bundle Tachycardia

Dr. Mariko W. Harper

Cardiology
CommonSpirit Health
Virginia Mason Medical Center
1100 Ninth Avenue, 
Seattle, WA 
Accepting New Patients
Offers Telehealth

Advanced in His Bundle Tachycardia
CommonSpirit Health
Virginia Mason Medical Center
1100 Ninth Avenue, 
Seattle, WA 
OverviewInsuranceLocationsClinical ResearchSimilar Doctors

Overview

"Mariko Harper, MD, FACC is a board-certified cardiologist who specializes in all aspects of adult cardiology including: coronary artery disease, hyperlipidemia, valvular heart disease, arrhythmias, genetic/infiltrative cardiomyopathy, hypertrophic cardiomyopathy (HCM) and heart failure. She has a special expertise in advanced heart failure and advanced cardiac imaging with additional training and board certifications in both echocardiography and nuclear cardiology.Dr. Harper serves as the Medical Director of The Hypertrophic Cardiomyopathy Center at Virginia Mason Franciscan Health. Under her direction, she has created a regional center providing an individualized approach to the diagnosis, genetic testing, advanced cardiac imaging and medical/surgical management of patients with HCM. Each patient is reviewed by a multidisciplinary team of physicians and treatment plans are designed with patient input, using a shared decision making model. The HCM Center offers comprehensive HCM treatments including: medical therapy, defibrillator implantation, alcohol septal ablation and surgical septal myectomy. The HCM Center is also one of the first centers in the PNW to offer the recently FDA-approved novel HCM medication mavacamten through a comprehensive drug safety program. She also serves as a principal investigator for ongoing HCM clinical trials.Dr. Harper has authored and published multiple peer reviewed articles and book chapters in a wide range of topics in cardiology. She has been an invited speaker at both national and regional meetings on topics including hypertrophic cardiomyopathy, hyperlipidemia, and preventive cardiology. Following her passion for patient education and cardiovascular disease prevention, she is also one of the course directors for the ""Food Is Medicine"" continuing medical education lecture series at Virginia Mason Franciscan Health. Dr. Harper believes in patient-centered and patient-driven care. She emphasizes the importance of shared clinical decision making, with open dialogue between the patient and the entirety of the patient's multidisciplinary care team.Dr. Harper has been recognized as aSeattle MetTop Doctor in 2021 and 2022.In her free time, she enjoys reading, gardening, running and spending time with her family.".

Dr. Harper is rated as an Advanced provider by MediFind in the treatment of His Bundle Tachycardia. Her top areas of expertise are Hypertrophic Cardiomyopathy (HCM), Heart Failure with Preserved Ejection Fraction (HFpEF), Familial Hypertrophic Cardiomyopathy, and Cardiomyopathy.

Her clinical research consists of co-authoring 4 peer reviewed articles. MediFind looks at clinical research from the past 15 years.

Graduate Institution
MD, University Of British Columbia, Vancouver, ; MS, Human Nutrition, Columbia University, New York, ; BS, Integrated Sciences, University Of British Columbia, Vancouver - 2005,2007,2011
Residency
University of Washington, Seattle - 2014
Specialties
Cardiology
Licenses
Internal Medicine in WA
Board Certifications
American Board Of Internal Medicine, Subspecialty In Cardiovascular Disease
National Board Of Echocardiography
Fellowships
University of Washington, Seattle - 2017
Hospital Affiliations
Virginia Mason Medical Center
Harrison Medical Center
Languages Spoken
English
Japanese
Gender
Female

Insurance

Accepted insurance can change. Please verify directly with the provider.

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Accepted insurance plans:

Aetna
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View 19 Less Insurance Carriers -

Locations

Virginia Mason Medical Center
1100 Ninth Avenue, Seattle, WA 98101
Call: 206-624-1144

Clinical Research

Clinical research consists of overseeing clinical studies of patients undergoing new treatments and therapies, and publishing articles in peer reviewed medical journals. Providers who actively participate in clinical research are generally at the forefront of the fields and aware of the most up-to-date advances in treatments for their patients.


4 Total Publications

Incidence and Outcomes of Atrial Fibrillation and Systolic Dysfunction in Patients Receiving Mavacamten for Obstructive Hypertrophic Cardiomyopathy: A Multicenter Study.
Incidence and Outcomes of Atrial Fibrillation and Systolic Dysfunction in Patients Receiving Mavacamten for Obstructive Hypertrophic Cardiomyopathy: A Multicenter Study.
Journal: medRxiv : the preprint server for health sciences
Published: September 26, 2025
View All 4 Publications
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Distinguished in His Bundle Tachycardia
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Virginia Mason Medical Center

1100 Ninth Avenue, 
Seattle, WA 
 (0.1 miles away)
206-624-1144
Languages Spoken:
English
See accepted insurances
Accepting New Patients
Offers Telehealth

Michael Longo, MD, FACC, is a board-certified cardiologist specializing in echocardiography, valvular heart disease and preventive cardiology.Dr. Longo enjoys getting to know his patients. He listens to them to understand their concerns and find out what they are interested in doing, then tailors their treatment accordingly. He is able to provide a collaborative approach to patient care that takes into consideration the expertise of other professionals, such as interventional cardiologists and thoracic surgeons, resulting in the right care for the right patient at the right time. He enjoys the fact that, once a diagnosis is made, he is often able to provide treatment that makes patients feel better, and live longer.Dr. Longo was voted one of Seattle's Top Doctors by Seattle Metropolitan magazine in 2009. Dr. Longo is rated as a Distinguished provider by MediFind in the treatment of His Bundle Tachycardia. His top areas of expertise are Atrial Fibrillation, Coronary Heart Disease, Angina, and Aortic Valve Stenosis.

VIEW MORE HIS BUNDLE TACHYCARDIA DOCTORS

Areas of Expertise

MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.

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Find Dr. Harper's expertise for a condition
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    • Distinguished
    • Angina
      Dr. Harper is
      Distinguished
      . Learn about Angina.
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    • Arrhythmias
      Dr. Harper is
      Distinguished
      . Learn about Arrhythmias.
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    • Cardiomyopathy
      Dr. Harper is
      Distinguished
      . Learn about Cardiomyopathy.
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    • Coronary Heart Disease
      Dr. Harper is
      Distinguished
      . Learn about Coronary Heart Disease.
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    • Familial Hypertrophic Cardiomyopathy
      Dr. Harper is
      Distinguished
      . Learn about Familial Hypertrophic Cardiomyopathy.
      See more Familial Hypertrophic Cardiomyopathy experts
    • Familial Neurocardiogenic Syncope
      Dr. Harper is
      Distinguished
      . Learn about Familial Neurocardiogenic Syncope.
      See more Familial Neurocardiogenic Syncope experts
    View All 12 Distinguished Conditions
    • Advanced
    • Aortic Valve Stenosis
      Dr. Harper is
      Advanced
      . Learn about Aortic Valve Stenosis.
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    • Atherosclerosis
      Dr. Harper is
      Advanced
      . Learn about Atherosclerosis.
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    • Atrial Fibrillation
      Dr. Harper is
      Advanced
      . Learn about Atrial Fibrillation.
      See more Atrial Fibrillation experts
    • Atrial Tachycardia
      Dr. Harper is
      Advanced
      . Learn about Atrial Tachycardia.
      See more Atrial Tachycardia experts
    • Atrioventricular Nodal Reentrant Tachycardia (AVNRT)
      Dr. Harper is
      Advanced
      . Learn about Atrioventricular Nodal Reentrant Tachycardia (AVNRT).
      See more Atrioventricular Nodal Reentrant Tachycardia (AVNRT) experts
    • Bidirectional Tachycardia
      Dr. Harper is
      Advanced
      . Learn about Bidirectional Tachycardia.
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    View All 18 Advanced Conditions
    • Experienced
    • Adenosine Deaminase 2 Deficiency
      Dr. Harper is
      Experienced
      . Learn about Adenosine Deaminase 2 Deficiency.
      See more Adenosine Deaminase 2 Deficiency experts
    • Anomalous Left Coronary Artery from the Pulmonary Artery
      Dr. Harper is
      Experienced
      . Learn about Anomalous Left Coronary Artery from the Pulmonary Artery.
      See more Anomalous Left Coronary Artery from the Pulmonary Artery experts
    • Aortic Regurgitation
      Dr. Harper is
      Experienced
      . Learn about Aortic Regurgitation.
      See more Aortic Regurgitation experts
    • Apoplexy
      Dr. Harper is
      Experienced
      . Learn about Apoplexy.
      See more Apoplexy experts
    • Arrhythmogenic Right Ventricular Cardiomyopathy
      Dr. Harper is
      Experienced
      . Learn about Arrhythmogenic Right Ventricular Cardiomyopathy.
      See more Arrhythmogenic Right Ventricular Cardiomyopathy experts
    • Arterial Embolism
      Dr. Harper is
      Experienced
      . Learn about Arterial Embolism.
      See more Arterial Embolism experts
    View All 51 Experienced Conditions
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