Final answer:
Increased systemic vascular resistance or vasoconstriction may be recognized clinically in conditions such as patent ductus arteriosus or coarctation of the aorta.
Step-by-step explanation:
Vasoconstriction is the narrowing of blood vessels, which leads to an increase in systemic vascular resistance. When this occurs in a child, it may be recognized clinically in conditions such as patent ductus arteriosus or coarctation of the aorta. In patent ductus arteriosus, the failure to close the ductus arteriosus results in increased pulmonary pressure and symptoms such as tachycardia, enlarged heart, and poor weight gain in infants. In coarctation of the aorta, the narrowing of the aorta restricts blood flow through the systemic artery, leading to symptoms such as difficulty breathing, dizziness, and chest pain.