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KEY POINTS 1. Pulmonary hypertension (PH) in young infants is defined as a resting mean pulmonary artery pressure (mPAP) ≥20 mm Hg. 2. The mPAP at birth resembles the systemic blood pressure and then drops to infrasystemic levels over the…
KEY POINTS 1. The normal cardiac electrical signal travels from the atria to the ventricles through a conduction system comprised of the sinus node, atrioventricular (AV) node, His bundle, and Purkinje system. 2. The AV node normally regulates the electrical…