What is a common sign associated with increased pulmonary vascular resistance in newborns?

Increased pulmonary vascular resistance in newborns is often associated with a hyperactive precordium. This sign indicates heightened activity or movement of the heart and associated structures, which can occur due to the heart working harder to overcome elevated pressures in the pulmonary circulation. In conditions such as pulmonary hypertension, the right side of the heart faces increased workload, leading to observable signs such as pulsations or an increased precordial activity during auscultation or palpation.

The other signs listed, like decreased heart rate, dry skin, and excessive crying, are not specific indicators of increased pulmonary vascular resistance. A decreased heart rate could indicate other complications such as bradycardia, which is not directly linked to pulmonary resistance. Dry skin is generally a sign of dehydration or possible endocrine issues, while excessive crying is a nonspecific response that can occur for a variety of reasons, including discomfort or hunger but not necessarily linked to pulmonary vascular resistance. Thus, the hyperactive precordium serves as a more direct indicator of the cardiovascular challenges associated with increased pulmonary vascular resistance in newborns.