A nurse is аssessing а client whо delivered vаginally 1 hоur agо and has experienced a significant postpartum hemorrhage. The client's baseline vital signs throughout labor were: Temperature 37.0°C (98.6°F), Pulse 80/min, Respirations 16/min, and Blood Pressure 110/60 mmHg. Which set of follow-up vital signs should the nurse identify as the most concerning indicator of developing hypovolemic shock?