Dr. Usman's Cardiology Notes

  Echocardiographic Assessment of Atrial Septal Defect (ASD): A Practical Guide Atrial septal defect (ASD) is one of the most common congenital heart defects encountered in adults. Echocardiography is the cornerstone of diagnosis because it not only demonstrates the defect but also determines its anatomical type, size, direction of shunting, hemodynamic significance, effects on the right heart, pulmonary artery pressure, and suitability for device closure. A good ASD echocardiographic examination should therefore answer more than simply: “Is an ASD present?” It should answer: What type of ASD is present? How large is the defect? What is the direction and magnitude of the shunt? Is there right ventricular volume overload? Is pulmonary hypertension present? Are the pulmonary veins normally connected? Is the anatomy suitable for transcatheter device closure? These elements form the basis of a systematic echocardiographic assessment. --- Types of Atrial Septal Defect An ASD should firs...

  PASP Calculation on Echocardiography: ASE 2025 Guide, Interpretation, Pitfalls, and Clinical Significance Pulmonary artery systolic pressure (PASP) is one of the most frequently reported measurements on transthoracic echocardiography (TTE). It provides a non-invasive estimate of pulmonary artery pressure and serves as an important screening tool for pulmonary hypertension (PH). However, PASP should never be interpreted in isolation. The latest American Society of Echocardiography (ASE) guidelines emphasize a multiparametric, probability-based approach rather than relying solely on a numerical PASP value. This article reviews the latest ASE recommendations, explains how PASP is calculated, discusses common pitfalls, and highlights how to interpret PASP accurately in daily clinical practice. ──────────────────────── What is PASP? Pulmonary artery systolic pressure (PASP) represents the peak systolic pressure within the pulmonary artery. In the absence of pulmonic valve stenosis or ...

  Tenting of the Mitral Valve: Understanding an Important Echocardiographic Marker Introduction Mitral valve tenting is an important echocardiographic finding frequently encountered in patients with functional or secondary mitral regurgitation (MR). It reflects distortion of the normal mitral valve geometry due to left ventricular remodeling and papillary muscle displacement, resulting in incomplete leaflet coaptation. Recognition and quantification of mitral valve tenting provide valuable information regarding the severity of ventricular remodeling, the mechanism of mitral regurgitation, and potential treatment strategies. --- What is Mitral Valve Tenting? Mitral valve tenting refers to the apical displacement of the mitral leaflets during systole below the plane of the mitral annulus, creating a characteristic "tent-like" appearance on echocardiography. Normally, mitral leaflets coapt at or slightly above the annular plane. When ventricular dilation or remodeling pulls the ...

  Mavacamten: Indications, Monitoring, and Practical Clinical Use in Obstructive Hypertrophic Cardiomyopathy Hypertrophic cardiomyopathy (HCM) is one of the most common inherited cardiac diseases, affecting approximately 1 in 500 people. While many patients remain asymptomatic, others develop significant symptoms due to obstruction of the left ventricular outflow tract (LVOT). Until recently, treatment options mainly focused on reducing symptoms with medications or relieving obstruction through invasive septal reduction procedures. The introduction of mavacamten has changed the management of symptomatic obstructive HCM. Rather than simply controlling heart rate or contractility, mavacamten directly targets the underlying disease mechanism, making it the first disease-specific medical therapy approved for obstructive HCM. This article reviews its mechanism of action, indications, patient selection, monitoring requirements, and practical clinical considerations. --- What is Mavacamte...

📌 Tissue Doppler Imaging (TDI): Understanding S′, e′, a′ and the Tei Index Tissue Doppler Imaging (TDI) is a valuable echocardiographic technique used to assess both systolic and diastolic myocardial function through measurement of mitral annular velocities. 🔹 S′ (Systolic Velocity) • Represents longitudinal LV systolic contraction. • Measured during ventricular systole. • Reduced S′ suggests impaired LV systolic function. 🔹 e′ (Early Diastolic Velocity) • Reflects active myocardial relaxation. • A key parameter for assessing LV diastolic function. • Reduced e′ indicates impaired relaxation and diastolic dysfunction. 🔹 a′ (Late Diastolic Velocity) • Generated by atrial contraction. • Becomes more prominent when ventricular relaxation is impaired. 📏 Important Time Intervals ⏱ IVCT (Isovolumic Contraction Time) • Interval between mitral valve closure and aortic valve opening. ⏱ ET (Ejection Time) • Duration of ventricular ejection. ⏱ IVRT (Isovolumic Relaxation Time) • Interval betw...

Inferior Vena Cava (IVC) Obstruction: Causes, Diagnosis, and Management Introduction Inferior vena cava (IVC) obstruction is an uncommon but clinically important condition resulting from partial or complete blockage of venous blood flow through the IVC. Because the IVC is the major venous conduit returning blood from the lower extremities, pelvis, and abdomen to the heart, obstruction can lead to significant venous congestion, edema, and thromboembolic complications. Early recognition is essential, as timely treatment can prevent morbidity and improve quality of life. --- Anatomy of the Inferior Vena Cava The IVC is the largest vein in the body and is formed by the confluence of the common iliac veins at the level of L5. It ascends through the abdomen, receives blood from the renal and hepatic veins, and enters the right atrium. Obstruction may occur at: - Infrarenal IVC - Suprarenal IVC - Hepatic segment of the IVC - Cavoatrial junction --- Causes of IVC Obstruction 1. Thrombotic Caus...

  Mitral Valve Prolapse (MVP): The Click Behind the Murmur Introduction Mitral Valve Prolapse (MVP) is one of the most common valvular heart abnormalities encountered in clinical practice. It occurs when one or both mitral valve leaflets bulge backward into the left atrium during systole. While many patients remain asymptomatic throughout life, others may develop palpitations, arrhythmias, mitral regurgitation, or rarely sudden cardiac death. With advancements in echocardiography, our understanding of MVP has evolved from a benign auscultatory curiosity to a clinically important structural heart disease with distinct phenotypes and risk profiles. --- Anatomy of the Mitral Valve The mitral valve apparatus consists of: Anterior and posterior mitral leaflets Mitral annulus Chordae tendineae Papillary muscles Left ventricular myocardium Proper coaptation of these structures ensures unidirectional blood flow from the left atrium to the left ventricle. In MVP, leaflet redundancy, myxomat...

  Evaluation of mitral prosthetic valve stenosis. Evaluation of Mitral Prosthetic Valve Stenosis on Echocardiography Introduction Mitral valve replacement significantly improves symptoms and survival in patients with severe mitral valve disease. However, prosthetic mitral valves may eventually develop obstruction due to thrombosis, pannus formation, structural degeneration, calcification, or infective vegetations. Echocardiography remains the cornerstone for assessing prosthetic mitral valve function and detecting stenosis. Evaluating prosthetic mitral valve stenosis can be challenging because prosthetic valves normally produce higher gradients than native valves. A comprehensive approach using two-dimensional imaging, Doppler assessment, and comparison with baseline studies is essential. --- Causes of Prosthetic Mitral Valve Stenosis Common causes include: Prosthetic valve thrombosis Pannus ingrowth Structural valve degeneration Calcification of bioprosthetic leaflets Vegetations ...

Evaluation of aortic prosthetic valve stenosis When the Valve Becomes the Problem: Echocardiographic Evaluation of Aortic Prosthetic Valve Stenosis Aortic valve replacement can dramatically improve symptoms and survival in patients with severe aortic valve disease. However, even after successful valve implantation, prosthetic valves are not immune to complications. One of the most important and challenging problems is prosthetic valve stenosis. For echocardiographers and clinicians, evaluating a stenotic prosthetic aortic valve requires more than simply measuring gradients. Prosthetic valves naturally produce higher velocities than native valves, and distinguishing normal prosthetic hemodynamics from true obstruction can sometimes feel like solving a puzzle. This article reviews the practical echocardiographic approach to evaluating aortic prosthetic valve stenosis in a clear and clinically useful way. --- Understanding Prosthetic Valve Stenosis Prosthetic valve stenosis refers to obst...