Which diagnosis should be considered in newborns who show signs of hypoperfusion and falling hematocrit after a vacuum-assisted delivery?

• A. Caput succedaneum
• B. Cephalhematoma
• C. Subgaleal hemorrhage
• D. Intracranial hemorrhage

Answer: (C)

Subgaleal hemorrhage is the key diagnosis when a newborn presents with signs of poor perfusion and a dropping hematocrit after vacuum-assisted delivery. This condition results from tearing of emissary veins in the subaponeurotic space, allowing blood to accumulate under the scalp and spread widely across the head. Because the bleeding can involve a large surface area, a substantial amount of blood can be lost into that potential space before the scalp findings are dramatic, leading to hypovolemia, pallor, tachycardia, and reduced perfusion, along with a fall in hematocrit.

Caput succedaneum is simply diffuse scalp edema that crosses suture lines and is typically benign, resolving within a few days without causing significant blood loss or systemic instability. Cephalhematoma is a subperiosteal bleed confined by suture lines and usually does not produce rapid hypoperfusion or large-volume blood loss. Intracranial hemorrhage can occur but would more often present with neurologic signs and may not explain a rapid hematocrit drop and systemic hypoperfusion in the absence of other findings. Subgaleal hemorrhage is the scenario that best fits the combination of diffuse scalp swelling with potential for major blood loss and ensuing hypoperfusion after vacuum-assisted delivery.