Patrick Sullivan

VA Coupling and Strategies to Augment Contractility or Afterload When Uncoupled: A Powerful Guide for Cardiovascular Optimization

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Introduction to VA Coupling in Cardiovascular Physiology VA coupling and strategies to augment contractility or afterload when uncoupled are central concepts in modern cardiovascular physiology and critical care medicine. Ventriculo-arterial (VA) coupling describes the mechanical and energetic relationship between the heart and the arterial system it pumps against. When this relationship is balanced, the heart … Read more

Diagnostic Challenges in Congenital Patients with Single-Ventricles: A Critical Role for PV Loops?

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Introduction to Single-Ventricle Congenital Heart Disease Congenital heart disease (CHD) represents the most common form of congenital malformation worldwide. Among its most complex forms are conditions in which only one functional ventricle supports systemic and pulmonary circulation. These patients, often referred to as having single-ventricle physiology, pose some of the most difficult diagnostic and management … Read more

BIV PV Loops: A Powerful New Way to Optimize VA ECMO Outcomes (7 Key Insights)

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Introduction to VA ECMO and Hemodynamic Challenges Veno-arterial extracorporeal membrane oxygenation (VA ECMO) is a life-saving therapy for patients with severe cardiogenic shock or cardiac arrest. It provides temporary circulatory and respiratory support, allowing time for myocardial recovery or transition to definitive therapies. However, despite its benefits, VA ECMO introduces complex hemodynamic changes that can … Read more

PV Loop Monitoring During Nitric Oxide Administration: A Powerful Guide With 7 Clinical Insights

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Introduction to Pressure–Volume Loop Monitoring Pressure–volume (PV) loop monitoring is a sophisticated cardiovascular assessment technique that provides real-time insight into ventricular performance. Unlike conventional monitoring tools that rely heavily on indirect measures such as blood pressure or cardiac output alone, PV loops capture the dynamic relationship between ventricular pressure and volume throughout the cardiac cycle. … Read more

PV Loops the Role of Vo (x-Intercept): A Powerful Guide With Clear Insights

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Introduction to Pressure–Volume (PV) Loops Pressure–volume (PV) loops are one of the most powerful tools used in cardiovascular physiology to understand how the heart works during each heartbeat. They combine pressure and volume changes in the left ventricle into a single diagram that tells a detailed story about cardiac performance. When learning PV loops the … Read more

Using conductance catheterization to determine suitability of repair in CCTGA patients: A Critical Clinical Insight

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Introduction Using conductance catheterization to determine suitability of repair in CCTGA patients has emerged as a powerful diagnostic strategy in modern congenital cardiology. Congenitally corrected transposition of the great arteries (CCTGA) is a rare and complex heart condition where the heart’s ventricles and great arteries are anatomically reversed, yet blood flows in a physiologically “corrected” … Read more

PV Loop Differences in TEER vs. Valve Replacement: A Powerful Clinical Comparison (7 Key Insights)

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Introduction to Pressure–Volume (PV) Loops in Cardiology Pressure–volume (PV) loops are one of the most useful tools in cardiology for understanding how the heart works. A PV loop shows how pressure and volume inside the left ventricle change during one heartbeat. By looking at the shape and size of the loop, doctors and students can … Read more

Baan’s Equation: Conductance-Based Pressure–Volume Loops

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Baan’s equation forms the mathematical and physiological foundation of conductance-based pressure–volume (PV) loop technology. This method allows real-time, beat-to-beat measurement of left ventricular volume inside the intact, beating heart—making it one of the most powerful tools for studying cardiac mechanics, ventricular-arterial coupling, and contractility. Traditional PV measurements relied on imaging or indicator dilution techniques, which … Read more

How is the ECG related to a PV loop: Powerful Insights

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Introduction to How is the ECG related to a PV loop Understanding how the ECG is related to a PV loop is essential for anyone studying the heart because it connects electrical activity with mechanical pumping. The ECG tells us when the heart is electrically activated, while the PV loop shows how the ventricles respond … Read more

Measuring forward flow versus regurgitant flow in structural heart disease: Essential Guide for Clinicians

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Structural heart disease alters the normal patterns of blood movement within the heart. One of the most important ways to understand these changes is by evaluating the balance between forward flow and regurgitant flow, especially through the lens of pressure–volume (PV) loop hemodynamics. PV loops offer a clear visual understanding of how valve disease impacts … Read more