Final answer:
The 3-month-old patient is likely experiencing hypovolemic shock due to symptoms of fever, vomiting, diarrhea, and clinical signs of poor perfusion and vital sign abnormalities. Immediate medical intervention is necessary to treat this life-threatening condition.
Step-by-step explanation:
The 3-month-old patient is presenting with signs and symptoms suggestive of shock, specifically what appears to be hypovolemic shock. This is indicated by the fever, vomiting, diarrhea, signs of poor perfusion like prolonged capillary refill time of 4-5 seconds, cool and mottled extremities, and significant vital sign changes such as tachycardia (heart rate of 190), tachypnea (respiratory rate of 70), hypotension (blood pressure of 59/29), and the requirement of 100% oxygen to maintain a pulse oximetry of 94%. The patient's clinical presentation aligns with the definition of shock, which is a life-threatening condition where the circulatory system fails to provide adequate oxygen and nutrients to the body's tissues.
In infants, especially those presenting with fever, vomiting, and diarrhea, it is important to consider infectious causes such as gastroenteritis, as well as the possibility of septic shock, though the given vital signs and physical assessment findings listed are more indicative of hypovolemic shock due to dehydration. Regardless, the condition is critical, and the infant requires immediate medical intervention to address the underlying cause and to restore adequate circulation.