Houston Methodist. Leading Medicine.
Houston Methodist. Leading Medicine

Howard P. Monsour, Jr., M.D.

Howard P. Monsour, Jr., M.D.

Miguel A. Quinones, M.D.

Media Contact:

Gale Smith

Chair/Department of Cardiology
Medical Director/Houston Methodist DeBakey Heart & Vascular Center

Clinical Interests

  • Cardiovascular disease
  • Atherosclerosis/lipoprotein
  • Aneurysms
  • Angiograms
  • Angioplasty
  • Aortic aneurysms
  • Congestive heart failure
  • Marfans Disease
  • CVA/Stroke
  • Hypertension
  • Pacemakers
  • Stents

Research Interests

  • Endocardiography
  • Myocardial perfusion
  • Coronary artery disease

Dr. Quinones´s studies cardiac function with a specific focus on using cardiac ultrasound. Early in his career he combined echocardiography with intracardiac pressure measurements to relate myocardial stress to systolic performance. Subsequently, his laboratory made important contributions in developing echocardiographic methods to measure left ventricular volumes and ejection fraction, cardiac output, regurgitant fractions in mitral and aortic insufficiency, and valve area in aortic stenosis. More recently, his laboratory has developed newer methods to evaluate diastolic function and estimate left ventricular filling pressures.

Dr. Quinones played a pivotal role in the development of stress echocardiography as a clinical tool for the evaluation of coronary artery disease. His was the first team to describe the post-treadmill echocardiographic technique that is currently used all over the world. In collaboration with the nuclear cardiology laboratory, they compared exercise echocardiography with SPECT thallium scintigraphy in the same patients. Both techniques were shown to have comparable sensitivity and specificity for detection of coronary artery disease. His laboratory has made important contributions in the field of myocardial perfusion utilizing injections of ultrasonic contrast agents into the aorta or coronary arteries, and is currently investigating the use of new intravenous agents for evaluation of perfusion.

Languages spoken: