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Qp Qs Ratio Calculator Summary and Clinical Context The Qp Qs ratio is a Doppler based calculation used to quantify the relationship between pulmonary blood flow and systemic blood flow. It is an essential parameter when evaluating patients with suspected intracardiac shunts such as atrial septal defect, ventricular septal defect, or patent ductus arteriosus. Doppler echocardiography provides a noninvasive method to
QTc Bazett Formula: Explanation and Clinical Context The QT interval represents the time from the start of ventricular depolarization to the end of ventricular repolarization on an electrocardiogram (ECG). QT interval duration varies with heart rate, and QTc (corrected QT) is calculated to standardize QT for heart rate. Bazett's formula is the most widely used correction: QTc = QT / √RR, where QT is in milliseconds a
QTc Fridericia Correction: Explanation and Clinical Context The Fridericia formula is used to correct the QT interval for heart rate: QTcF = QT / (RR^1/3), where RR is the interval between heartbeats in seconds. It provides a more accurate correction than Bazett's formula, especially at extreme heart rates. QTc prolongation is associated with increased risk of ventricular arrhythmias, including Torsades de Pointes, a
QUICKI Insulin Sensitivity Index Explanation and Clinical Context QUICKI is a validated surrogate marker to estimate insulin sensitivity that uses fasting glucose and fasting insulin values. It provides a simple and reproducible method to screen metabolic health in clinical and research settings. The mathematical structure of QUICKI gives a continuous scale where lower values reflect diminished insulin sensitivity su