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Zorluk: ZorPhysiological Adaptation

A nurse is caring for a client with a severe intra-abdominal infection who has received 3 L3\text{ L} of 0.9%0.9\% sodium chloride intravenously over the past 22 hours. The client is lethargic, and the nurse notes the following assessment findings:

AssessmentFinding
Blood pressure78/40 mm Hg78/40\text{ mm Hg}
Heart rate128 beats/min128\text{ beats/min}
Respiratory rate28 breaths/min28\text{ breaths/min}
Urine output10 mL/hr10\text{ mL/hr}
Arterial Blood GaspH=7.25pH = 7.25, PaCO2=30 mm HgPaCO_2 = 30\text{ mm Hg}, HCO3−=14 mEq/LHCO_3^- = 14\text{ mEq/L}

Based on these findings, which of the following actions is the nurse's priority?

  1. A
    Administer intravenous sodium bicarbonate to reverse the severe acidemia.
  2. B
    Elevate the head of the bed to 90∘90^\circ to assist with the increased respiratory rate.
  3. Initiate a prescribed continuous intravenous infusion of norepinephrine.Cevap
  4. D
    Request a stat prescription for a portable chest x-ray to determine the cause of tachypnea.

Cevap

The priority action is to initiate a prescribed continuous intravenous infusion of norepinephrine.
The client is exhibiting signs of fluid-refractory septic shock, evidenced by profound hypotension (Mean Arterial Pressure <65 mm Hg< 65\text{ mm Hg}) and oliguria despite receiving a massive fluid bolus of 3 L3\text{ L}. The ABG reveals a metabolic acidosis, which in this context is lactic acidosis secondary to systemic hypoperfusion. The compensatory mechanism for this is tachypnea (blowing off CO2CO_2). The absolute highest priority is to restore vascular tone and vital organ perfusion by initiating a vasopressor such as norepinephrine.

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1
Evaluate the client's hemodynamic status and response to initial fluid resuscitation.
The blood pressure remains critically low (78/40 mm Hg78/40\text{ mm Hg}, resulting in a Mean Arterial Pressure of approximately 52 mm Hg52\text{ mm Hg}) despite the administration of a massive 3 L3\text{ L} isotonic fluid bolus.
This identifies that the client has progressed to fluid-refractory septic shock and requires immediate escalation of cardiovascular support.
2
Analyze the arterial blood gas (ABG) results in the context of the clinical picture.
The ABG shows a partially compensated metabolic acidosis (pHpH 7.257.25, HCO3−HCO_3^- 14 mEq/L14\text{ mEq/L}) with compensatory hyperventilation (RRRR 2828, PaCO2PaCO_2 30 mm Hg30\text{ mm Hg}).
This confirms that the acid-base imbalance is driven by lactic acid accumulation from poor tissue perfusion (anaerobic metabolism), rather than a primary respiratory issue.
3
Determine the highest priority intervention using ABCs and survival priorities.
Administering a vasopressor (norepinephrine) is identified as the immediate life-saving action.
Restoring systemic vascular resistance and mean arterial pressure is essential to perfuse vital organs, halt the ischemic cascade, and resolve the underlying cause of the lactic acidosis.

Anahtar Kavram

Management of fluid-refractory septic shock and recognition of secondary lactic acidosis.
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Konular

Physiological Adaptation

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