Pediatric poisoning - Nursing Case Study

Pathophysiology

• Primary mechanism: Absorption and Distribution - Children have a higher metabolic rate and thinner skin, increasing the absorption rate of toxins. Their immature liver and kidneys affect the distribution and elimination, leading to prolonged circulation of poisons.

• Secondary mechanism: Cellular Toxicity - Poisons often interfere with cellular respiration and mitochondrial function. In children, this can rapidly disrupt energy production, particularly affecting high-demand organs like the brain and heart.

• Key complication: Neurological Impairment - Due to immature blood-brain barriers, toxins more easily penetrate the central nervous system, potentially leading to seizures, developmental delays, or coma, necessitating rapid intervention.

Patient Profile

Demographics:

8-year-old female, elementary school student

History:

• Key past medical history: Asthma, well-controlled

• Current medications: Albuterol inhaler as needed

• Allergies: None known

Current Presentation:

• Chief complaint: Ingestion of unknown household cleaner

• Key symptoms: Nausea, vomiting, abdominal pain, dizziness, mild confusion

• Vital signs: Temperature 99.5°F, Heart rate 110 bpm, Respiratory rate 24 breaths/min, Blood pressure 100/60 mmHg, Oxygen saturation 94% on room air

Section 1

Change in Patient Status:

Shortly after the initial presentation, the patient's condition begins to deteriorate. The nursing team observes an increase in her respiratory rate to 28 breaths per minute and a decrease in her oxygen saturation to 90% on room air, indicating potential respiratory compromise. Her heart rate has risen to 120 bpm, and she appears increasingly lethargic, struggling to stay awake during the examination. The abdominal pain has intensified, and she is now experiencing frequent episodes of non-bilious vomiting, raising concerns about possible gastrointestinal distress or further toxin absorption. The nursing team notes that her skin has become cool and clammy, a sign potentially suggestive of progressing shock or systemic response to the toxin.

The clinical team prioritizes stabilizing her respiratory status and orders supplemental oxygen therapy to maintain adequate oxygenation. Despite these measures, her confusion worsens, and she begins to exhibit signs of mild agitation and irritability, indicating escalating neurological involvement. The team considers the possibility of metabolic acidosis due to toxin ingestion and orders an arterial blood gas (ABG) analysis to further assess her acid-base balance. Concurrently, a complete metabolic panel and liver function tests are drawn to evaluate her systemic status, focusing on potential hepatic involvement given her immature liver's role in metabolizing toxins.

These developments prompt a shift in the clinical approach, where the team must now consider more aggressive interventions to prevent further complications. The possibility of toxin-induced organ dysfunction, particularly affecting the central nervous and respiratory systems, necessitates a multidisciplinary approach, including the involvement of a pediatric toxicologist. The team begins preparing for potential advanced interventions, such as securing the airway and initiating toxin-specific therapies, to mitigate the risk of rapid progression to more severe outcomes like seizures or respiratory failure.

Section 2

As the clinical team continues to monitor the patient, the results from the arterial blood gas (ABG) analysis return, revealing a significant metabolic acidosis with a pH of 7.25, bicarbonate level of 15 mEq/L, and a base excess of -10. The partial pressure of carbon dioxide (PaCO2) is slightly lower at 30 mmHg, indicating a compensatory respiratory alkalosis. The complete metabolic panel shows elevated anion gap metabolic acidosis with an anion gap of 20, suggestive of an accumulation of unmeasured anions typical in cases of toxin ingestion. The liver function tests reveal mildly elevated transaminases, with AST at 80 U/L and ALT at 95 U/L, indicating some degree of hepatocellular injury, likely secondary to the toxin's effects.

In response to these findings, the clinical team adjusts their approach to focus on correcting the metabolic acidosis and preventing further deterioration. Intravenous sodium bicarbonate is administered to help buffer the acidemia, and continuous monitoring is established to assess the patient's response to the intervention. Simultaneously, the pediatric toxicologist recommends initiating activated charcoal administration to limit further gastrointestinal absorption of the toxin, provided that the patient's airway is protected and her level of consciousness does not contraindicate this treatment.

Despite these measures, the patient's neurological status continues to decline, with increased disorientation and decreased responsiveness, necessitating an urgent reassessment of her airway protection. The respiratory therapist is called to the bedside to assist with potential intubation, and preparations are made for mechanical ventilation should her respiratory status further compromise. The team remains vigilant for signs of progression to more severe complications, such as seizures or worsening hepatic function, and discusses the need for possible transfer to a pediatric intensive care unit for more intensive monitoring and treatment. This situation underscores the importance of rapid intervention and continuous reassessment in managing pediatric poisoning cases to prevent irreversible organ damage and ensure the best possible outcomes.

Section 3

As the clinical team continues to closely monitor the patient, her condition takes another turn. Despite the administration of sodium bicarbonate, the patient's blood gas analysis reveals persistent metabolic acidosis with a pH remaining at 7.28, bicarbonate level of 16 mEq/L, and an unchanged anion gap of 20. Her neurological status further deteriorates, characterized by a Glasgow Coma Scale (GCS) score dropping to 8, indicating severe impairment of consciousness. Vital signs show a respiratory rate of 28 breaths per minute, heart rate of 130 beats per minute, and blood pressure at 90/50 mmHg, suggesting compensatory mechanisms are still actively engaged but beginning to falter. The elevated heart rate and hypotension raise concerns for potential cardiovascular compromise, a common complication in significant toxin exposures.

New laboratory results return, showing a further increase in liver enzymes with AST rising to 120 U/L and ALT to 140 U/L, suggesting an ongoing hepatocellular injury. The blood urea nitrogen (BUN) and creatinine levels are now slightly elevated at 28 mg/dL and 1.2 mg/dL respectively, hinting at possible renal involvement, either from the toxin itself or due to hypoperfusion. This multi-organ involvement necessitates a more aggressive management approach.

The clinical team convenes to reassess the treatment plan, considering the escalation to continuous renal replacement therapy (CRRT) to support renal function and enhance toxin clearance. With the patient’s worsening neurological status, the decision is made to proceed with intubation to secure the airway and facilitate better ventilation control. Additionally, the pediatric intensivist is consulted to evaluate the need for potential liver support therapies, such as N-acetylcysteine, depending on the suspected toxin. The team remains focused on stabilizing the patient’s condition while initiating plans for transfer to the pediatric intensive care unit for advanced supportive care, recognizing that timely escalation of interventions is crucial to her recovery.

Section 4

As the clinical team implements the updated management plan, the patient is promptly intubated, ensuring airway protection and allowing for precise control of ventilation. Following intubation, the patient's respiratory rate is stabilized at 18 breaths per minute with mechanical ventilation settings, while her oxygen saturation improves to 98% on 40% FiO2. Despite these initial positive changes, her hemodynamic status remains precarious. Her blood pressure has decreased further to 85/45 mmHg, and her heart rate remains elevated at 135 beats per minute. A fluid bolus of normal saline is administered to address the hypotension, and continuous infusion of norepinephrine is initiated to support her cardiovascular status.

The decision to begin continuous renal replacement therapy (CRRT) is executed swiftly, and within hours, there is a modest improvement in renal function indicators. Her creatinine levels decrease to 1.0 mg/dL, and blood urea nitrogen (BUN) levels stabilize at 26 mg/dL, suggesting the intervention is effectively aiding in toxin clearance and supporting renal function. However, her liver enzymes continue to climb, with AST reaching 150 U/L and ALT at 160 U/L, highlighting ongoing hepatocellular injury and emphasizing the need for further liver support.

In light of these developments, the team proceeds with the administration of N-acetylcysteine as a prophylactic measure against potential acute liver failure, suspecting acetaminophen toxicity as a contributing factor. The pediatric intensivist advises close monitoring for signs of coagulopathy or encephalopathy, which could indicate worsening hepatic function. As the patient is transferred to the pediatric intensive care unit, the clinical team remains vigilant, prioritizing frequent reassessment and adjustment of the treatment plan, underscoring the complexity of managing multi-organ dysfunction in pediatric poisoning cases.

Section 5

As the hours progress in the pediatric intensive care unit, the clinical team closely monitors the patient for any new complications. Despite the initial positive response to the interventions, the team notes a concerning change in her neurological status. The patient, who was previously responsive to painful stimuli, now exhibits a decreased level of consciousness with a Glasgow Coma Scale score dropping to 7. This decline suggests possible progression of hepatic encephalopathy, necessitating urgent re-evaluation of her neurological and hepatic function.

Concurrent with the neurological deterioration, new diagnostic results reveal an elevated ammonia level of 120 µmol/L, corroborating the suspicion of worsening hepatic encephalopathy. Additionally, her coagulation profile indicates a prolongation of prothrombin time (PT) to 18 seconds and an international normalized ratio (INR) of 2.0, signaling emerging coagulopathy. These findings prompt the team to intensify hepatic support measures and revise her treatment plan. Fresh frozen plasma is administered to address the coagulopathy, and lactulose therapy is initiated to help reduce ammonia levels and mitigate encephalopathic symptoms.

The patient's evolving condition underscores the complexity and interconnectedness of multi-organ failure in pediatric poisoning. The clinical team remains vigilant, reassessing her response to the adjusted interventions and preparing for potential escalation of care. As they continue to refine her management, the team emphasizes the need for a multidisciplinary approach, recognizing the critical role of timely intervention and cohesive communication in navigating the challenges of this pediatric poisoning case.