Shock (Case 42)

Chapter 84 Shock (Case 42)





Case


A previously healthy 4-year-old child presents to the emergency department with fever and listlessness. The patient has a heart rate of 190 beats per minute and is hypotensive with a blood pressure of 75/25 mm Hg. The respiratory rate is 35 breaths per minute with mildly increased work of breathing; the oxygen saturation is 100%. The parents say that their child has not eaten well in the last 24 hours and has had no urine output in the last 12 hours. The patient has been vomiting and has had some diarrhea for the last 24 hours.





Speaking Intelligently


When I admit a patient with shock, the first thing I do is assess the airway, breathing, and circulation (ABCs). It is crucial to ensure adequate oxygen delivery to the tissues because shock, regardless of etiology, is a state of oxygen delivery inadequate to meet the demands of the tissues. Oxygen delivery is a product of cardiac output and oxygen content of the blood. Therefore, the oxygen delivery to the body can be determined by the following equation:



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where







Bearing this in mind, one needs to provide oxygen to a patient in shock and have a low threshold for intubating the patient and taking over the patient’s work of breathing. As I assess the child, I keep in mind that although many perceive hypotension as the hallmark of shock, in pediatrics this can be a late sign because the ability of young patients to compensate with tachycardia to maintain cardiac output can be significant. Therefore a significant tachycardia even with a normal blood pressure is very concerning. Volume resuscitation with fluid boluses of 20 mL/kg given quickly is the next priority. Basic lab work, most importantly a determination of blood gas levels, can help determine the severity of the situation by revealing the acid-base status. Some institutions can quickly obtain a “critical care” panel or i-STAT that will also provide electrolyte and lactate levels. History and a careful physical are important to determine the specific etiology of the shock state and to allow for tailoring of therapy.



Patient Care





Jul 18, 2016 | Posted by in PEDIATRICS | Comments Off on Shock (Case 42)

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