Measurement of systemic and pulmonary blood flow and QP/QS ratio using Doppler and two-dimensional echocardiography.

This Qp/Qs ratio calculator helps evaluate atrial or ventricular septal defects by revealing right to left, respectively left to right shunts.

Welcome to the Qp/Qs calculator, a tool that will help you quickly calculate and interpret the Qp/Qs ratio for patients with cardiac shunts. Along the way, we'll give you a short refresher on the circulatory system and insight into the causes and effects of cardiac shunts.

Feb 2, 2025 · The shunt fraction (Qp/Qs) is a critical hemodynamic parameter used to quantify the ratio of pulmonary blood flow (Qp) to systemic blood flow (Qs). This measurement is pivotal in diagnosing and managing congenital or acquired cardiac shunts, such as atrial septal defects (ASD), ventricular septal defects (VSD), and patent ductus arteriosus (PDA).

The equation for right sided cardiac output (Qp) over left sided cardiac output (Qs) is Qp = [(RVOT diameter/2)^2*pi] * RVOT VTI. Qs = [(LVOT diameter/2)^2*pi] * LVOT VTI pi cancels out since it is in the numerator and denominator so this = …

Thus Qp/Qs can be calculated . Qs = Rate of O2 extraction / change in O2 content Qp = Rate of O2 addition/ change in O2 content

Mar 19, 2024 · The Qp Qs Ratio is crucial in diagnosing and understanding the severity of shunts between the pulmonary and systemic circulation, commonly seen in congenital heart diseases. A balanced Qp/Qs ratio indicates a normal condition, whereas an imbalanced ratio suggests the presence of a shunt.

This online QP/QS calculator tool allows you to measure the ratio of pulmonary to systematic blood flow across an intracardiac shunt which helps you quantify net shunt.

Online calculator for precise calculations of Pulmonic Blood Flow, Systemic Blood Flow, and QP/QS ratio effortlessly. QP/QS estimation is crucial for patients with intra-cardiac or extra-cardiac shunts, determined through 2-D echo and spectral Doppler measurements.

How to get a Shunt Fraction (Qp/Qs). Measure the LVOT diameter in centimeters. The optimal view is the mid transgastric LVSAX view. Measure the PWT, SWT, and LVID. The optimal view is a maximally zoomed view of the midesophageal AVLAX. The gain and compress should be set so the endomyocardial wall of the LVOT is clearly discernable.