Cardiology Make an Appointment Refer a Patient Ask a Question Make an Appointment Refer a Patient Ask a Question Condition Information Cardiac Conditions Cardiac Sarcoidosis Congestive Heart Failure Coronary Artery Disease Diastolic Dysfunction Dyspnea (Shortness of Breath) Heart Valve Disease High Cholesterol Hypertension Intracardiac Shunts Pulmonary Hypertension: Overview Programs & Services Anticoagulation Clinic Cardiac Sarcoid Program Coronary Artery Disease Program Division of Cardiology (Adult) Exertional Dyspnea Program Heart Disease Prevention Program Heart Failure Diagnosis and Management Program Human Performance Program Pulmonary Hypertension Center Valvular Disease Program Walk With a Doc Our Specialists Howard D. Weinberger, MD, FACC + × Howard D. Weinberger, MD, FACC Professor Department of Medicine Division of Cardiology View Full Profile Patient Rating 4.7 out of 5 stars Make an Appointment Darlene Kim, MD, FACC + × Darlene Kim, MD, FACC Assistant Professor Department of Medicine Division of Cardiology View Full Profile Patient Rating 4.8 out of 5 stars Make an Appointment Megan Knecht, ANP-BC + × Megan Knecht, ANP-BC Nurse Practitioner Division of Cardiology Department of Medicine View Full Profile Make an Appointment Andrew M. Freeman, MD, FACC, FACP + × Andrew M. Freeman, MD, FACC, FACP Associate Professor Director of Cardiovascular Prevention and Wellness Division of Cardiology Department of Medicine View Full Profile Patient Rating 4.6 out of 5 stars Make an Appointment Kern Buckner, MD + × Kern Buckner, MD Chief, Division of Cardiology Professor Department of Medicine Division of Cardiology View Full Profile Patient Rating 4.9 out of 5 stars Make an Appointment Zaki A. Refaat, MD + × Zaki A. Refaat, MD Assistant Professor Department of Medicine Division of Cardiology View Full Profile Patient Rating 4.8 out of 5 stars Make an Appointment Brett E. Fenster, MD, FACC, FASE + × Brett E. Fenster, MD, FACC, FASE Associate Professor Director of Pulmonary Hypertension Center Department of Medicine Division of Cardiology View Full Profile Patient Rating 4.8 out of 5 stars Make an Appointment Barbara Lemer, NP + × Barbara Lemer, NP Nurse Practitioner Division of Cardiology Department of Medicine View Full Profile Make an Appointment View all (8) doctors specializing in Cardiology Find a Doctor Clinical Trials Pulmonary (Arterial) Hypertension Study Tests Ambulatory Blood Pressure Monitoring Cardiac Catheterization Cardiac MRI Cardiac Stress Test Using Medicine Coronary CT Angiogram Echocardiogram Holter Monitoring Nuclear Cardiac Stress Test Synchronized Cardioversion for an Abnormal Heart Rhythm Transesophageal Echocardiogram Support Groups & Events Living with Chronic Disease Managing Your Energy Everyday Nutrition and Heart Health Stress Management and Relaxation Tools for Fitness Walk With a Doc Related Locations Highlands Ranch Main Campus For Professionals Refer a Patient Order a Test Consult with a Physician Related Programs Clinical Nutrition Services Department of Medicine Division of Environmental & Occupational Health Sciences Division of Rheumatology Institute for Advanced Biomedical Imaging Interstitial Lung Disease Program Pulmonary Hypertension Center Rehabilitation Services View All Programs Related Conditions Obstructive Sleep Apnea (OSA) Reasons to Visit National Jewish Health The leading respiratory hospital in the nation and the only one devoted fully to the treatment of respiratory and related illnesses Ranked as one of the top two hospitals in pulmonology every year since U.S. News & World Report included this category in its annual “Best Hospitals” survey Ranked in the top 1 percent of hospitals in the nation by HCAHPS Physicians frequently recognized as among the best in the nation by multiple services, including Best Doctors in America and Castle Connolly Among the top 8 percent of organizations funded for research by the NIH, providing patients access to the latest clinical trials 118-year history of focus on care, research and education serving thousands of patients with lung, heart, immune and related disorders Make an Appointment Patient Stories Patients Out of Options Found Answers Here What do you do when you are allergic to the very medicine that’s supposed to help you? Where do you turn when years of treatment don’t make you feel better? Meet Caleb, Jerry and Adam, each of whom struggled with life-threatening health issues before finding National Jewish Health. They came here as a last resort, and found doctors and researchers who listened and found answers that changed their lives. Read More View All Patient Stories Health Insights & News Giving Help us treat patients with heart-lung conditions. Ways to Give 80 percent of #heartdisease and #stroke events can be prevented. Tweet this Featured Health Insight Allergy and Asthma Holiday Tips Learn More Bone Health Lung Cancer Risk Factors Working the Rheum: Tips for Living Better with RA Flu Season Surviving Spring Allergies Harnessing the Body’s Power to Fight Disease Improve Your Heart Health Tips for Preventing a Cold Tips for Preventing a Cold Daylight Savings & Sleep Living with Chronic Lung Disease Steps to Get Ahead of the Spring Allergy Season Exercising as a Family E-Cigarettes 10 Tips for Managing COPD Best & Worst Cities for Ozone Pollution Cigarette Chemicals Better Health Starts After the Last Cigarette Food Allergies and School Women Are You Getting Enough Sleep? Heart / Lung Connection Getting Your Sleep Patterns Back on Track Heart Healthy Tips Allergy and Asthma Holiday Tips What's the Connection? Your Heart Can Affect Your Breathing Nasal Wash Guide Pneumococcal Pneumonia Pneumococcal Pneumonia Fall Allergy Tips Shortness of Breath and Eating Better Health Starts After the Last Cigarette (Version 2) High Cholesterol: Lifestyle Management Asthma & Pets Athletes & Asthma Spring Allergies Reflux and Lung Disease Help! I Can’t Sleep! Healthier Ingredient Substitutes Why Breakfast Matters Avoid and Treat Insect Stings Flu Prevention Tips Precautions to Prevent Asthma Attacks Triggered by Cold Weather Kitchen Safety & Food Allergies Understanding Vocal Cord Dysfunction Top Reasons To Get Enough Sleep Hidden Allergens at Home Lung Cancer at a Glance The Future of Breathing Is Your Child Getting Enough Sleep? Hidden Holiday Food Allergens Soak & Seal Get The 411 on Flu Vaccines Managing Exercise Induced Asthma Quitting Tobacco Child Sleep Needs Sodium Dangers Is your shower head making you sick? Sodium and Allergens in BBQs Top 10 Inhaler Mistakes Adults Make Keep Hands Clean Good Night's Sleep Despite Allergies Eating Well Throughout the Holiday Season Altitude and the Heart Proper Hydration Getting Sleep Schedules Ready for School Summer Allergy Tips Understanding Osteoporosis Healthy Homes: Reduce Chemical Irritants Chemical irritants are compounds that usually have a noticeable smell and can irritate your child’s lungs and make their asthma... Asthma HEPA Filters Increasing Your Bed Bug Awareness Congestive Heart Failure: Lifestyle Management Knowing Risk Factors Can Prevent Colon Cancer Early detection can reduce the colon-cancer death toll through prevention and treatment. Sarcoidosis: Lifestyle Management The primary source of vitamin D in our bodies comes from our diet. Healthy Homes: Eliminate Tobacco Smoke Learn how to eliminate tobacco smoke from your home. Safe Exercise for Patients with Heart Disease Spring Allergy Tips Healthy Homes: Eliminate Mice and Rats Learn about mice and rats and how to take action to keep your home healthy. Cardiology Healthy Homes: Eliminate Cockroaches Healthy Homes: Reduce Dust Mites Learn about dust mites and what actions to take. Plant-Based Diets Asthma Inhalers Healthy Homes: Reduce Mold Allergies Watch these videos to learn more about allergies. Asthma Healthy Homes: Reduce Dust House dust is a mixture of substances that can make asthma symptoms worse, learn more. Cutting Sodium Winter Allergy Tips Know Your Allergy Season Hypertension: Lifestyle Management Hypertension usually requires lifelong management. Healthy Homes: Reduce Pet Allergens NTM Infections Cardiology Medications Anticoagulant medicines are a group of medicines that help to preventblood clots. Blood clots can cause heart attacks and strokes. Tips to Protect Your Vocal Cords Try these tips to maintain a healthy voice. Indoor Air Pollution It is important to look at sources within the home that may emit particulates, gases and fumes harmful to our health.