5.3 Pediatric Sepsis, Febrile Neutropenia & Central Line-Associated Bloodstream Infections
Key Takeaways
- The Surviving Sepsis Campaign International Guidelines for pediatric sepsis mandate administration of empiric broad-spectrum IV antimicrobials within 1 hour of recognition for septic shock, and within 3 hours for sepsis-induced organ dysfunction without shock.
- Pediatric febrile neutropenia (FN) is defined as a single temperature >=38.3 C (or >=38.0 C sustained >1 hour) with an ANC <500 cells/mm3 (or expected to fall <500); high-risk patients require immediate hospitalization and empiric IV antipseudomonal beta-lactam monotherapy (cefepime, piperacillin-tazobactam, or meropenem).
- Empiric vancomycin should NOT be routinely added to initial pediatric FN regimens; vancomycin is strictly indicated only for hemodynamic instability, clinically suspected catheter-tunnel/pocket infection, Gram-positive blood cultures, known MRSA colonization, or severe mucositis.
- In central line-associated bloodstream infections (CLABSI), immediate catheter removal is mandatory for Staphylococcus aureus, Candida species, Pseudomonas aeruginosa, non-tuberculous mycobacteria, tunnel/pocket infection, or septic shock; antimicrobial lock therapy is reserved for salvageable lines infected with low-virulence organisms (e.g., CoNS).
- Fluid resuscitation in pediatric septic shock utilizes 10-20 mL/kg aliquots of balanced crystalloids (Lactated Ringer's or Plasma-Lyte) over 5-20 minutes, titrated to clinical perfusion targets while monitoring for hepatomegaly and crackles, with epinephrine (cold shock) or norepinephrine (warm shock) as first-line inotropes.
5.3 Pediatric Sepsis, Febrile Neutropenia & CLABSI
Quick Answer: The Surviving Sepsis Campaign mandates administering empiric broad-spectrum IV antimicrobials within 1 hour for pediatric septic shock, and within 3 hours for sepsis with organ dysfunction without shock. Resuscitate with balanced crystalloids (10–20 mL/kg aliquots), initiating epinephrine for cold shock or norepinephrine for warm shock. Pediatric febrile neutropenia (temp ≥38.3°C, ANC <500) requires urgent IV antipseudomonal beta-lactam monotherapy: cefepime (150 mg/kg/day divided q8h) or piperacillin-tazobactam (300–400 mg/kg/day divided q6–8h); add vancomycin only for shock, catheter site infection, or Gram-positive cultures. For CLABSI, prompt line removal is mandatory for S. aureus, Candida, P. aeruginosa, tunnel infections, or shock; catheter lock therapy is restricted to salvage with low-virulence organisms (CoNS).
1. Pediatric Sepsis & Septic Shock: Surviving Sepsis Campaign Guidelines
The 2020 Surviving Sepsis Campaign International Guidelines for the Management of Septic Shock and Sepsis-Associated Organ Dysfunction in Children established rigorous, time-critical bundles designed to abort microvascular collapse and multiorgan dysfunction syndrome (MODS).
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| Surviving Sepsis Timing & Resuscitation Bundles |
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| Clinical Status | Antimicrobial Timing Window | Resuscitation Priorities |
|-----------------------------|-------------------------------|-----------------------------------|
| Septic Shock | Administer within 1 HOUR | - Vascular / IO access |
| (Hypotension, altered cap | of recognition | - Blood cultures PRIOR to abx |
| refill, abnormal pulses) | | - 10-20 mL/kg balanced crystalloid|
| | | - Early vasoactive infusions |
| Sepsis-Associated Organ | Administer within 3 HOURS | - Targeted diagnostic workup |
| Dysfunction (Without shock) | of recognition | - Close hemodynamic monitoring |
| | | - Maintain organ perfusion |
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Fluid Resuscitation: Crystalloid Selection & Safety Limits
- Fluid Type: Guidelines recommend balanced crystalloids (e.g., Lactated Ringer's or Plasma-Lyte) over 0.9% normal saline. High-volume 0.9% normal saline infuses large supranormal chloride loads ($154 \text{ mEq/L}$), triggering hyperchloremic metabolic acidosis, renal cortical vasoconstriction, and increased rates of acute kidney injury.
- Administration Rate: Infuse in 10 to 20 mL/kg aliquots over 5 to 20 minutes.
- Fluid Overload Monitoring: Reassess the child after each aliquot for signs of fluid responsiveness (improved capillary refill, normalization of heart rate, widening pulse pressure, urine output $>1 \text{ mL/kg/h}$) and signs of fluid overload (hepatomegaly, new gallop rhythm, fine pulmonary crackles, worsening work of breathing). Discontinue fluid boluses immediately if fluid overload emerges.
Vasoactive Support: Cold Shock vs Warm Shock
Unlike adult septic shock (which is predominantly hyperdynamic "warm shock" with low systemic vascular resistance), pediatric septic shock presents as "cold shock" in ~60% of cases, characterized by profound myocardial depression, low cardiac output, and severe compensatory vasoconstriction.
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| Vasoactive Selection in Pediatric Septic Shock |
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| Shock Phenotype | Clinical Presentation | First-Line Vasoactive Agent |
|---------------------|-------------------------------------|-------------------------------------|
| Cold Shock | Cold, clammy extremities; capillary | Epinephrine infusion |
| (Low cardiac index, | refill >2 seconds; diminished | (0.05 to 0.3 mcg/kg/min) |
| high SVR) | peripheral pulses; narrow pulse | Potent beta-1 inotropy with modest |
| | pressure | alpha-1 vasoconstriction |
| Warm Shock | Warm, flushed extremities; flash | Norepinephrine infusion |
| (High cardiac index,| capillary refill (<1 second); | (0.05 to 0.5 mcg/kg/min) |
| low SVR / vasoplegia| bounding peripheral pulses; wide | Potent alpha-1 vasoconstriction with|
| | pulse pressure | modest beta-1 support |
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Note: Dopamine is no longer recommended as first-line therapy because clinical trials show increased mortality and higher rates of healthcare-associated infections compared to epinephrine.
2. Pediatric Febrile Neutropenia (FN)
In pediatric oncology and hematopoietic stem cell transplantation (HSCT) patients, chemotherapy-induced neutropenia strips the host of primary innate phagocytic defenses. Because neutrophils are responsible for erythema, swelling, and purulent exudates, fever is often the sole presenting sign of life-threatening bacteremia.
Definitions & The Absolute Neutrophil Count (ANC)
- Fever: A single oral temperature ≥38.3°C (101.0°F) OR a temperature ≥38.0°C (100.4°F) sustained over at least 1 hour.
Patient Safety Warning: Rectal temperatures and rectal medications are strictly contraindicated in neutropenic patients due to mucosal fragility; micro-tears in rectal mucosa allow enteric bacteria (Enterobacteriaceae, Pseudomonas) to translocate directly into the bloodstream.
- Neutropenia: An ANC <500 cells/mm³ (or $<0.5 \times 10^9/\text{L}$) OR an ANC <1000 cells/mm³ with a projected decline to <500 cells/mm³ within 24 to 48 hours.
High-Risk vs Low-Risk Stratification
Pediatric guidelines (ASCO/IDSA and International Pediatric FN Guidelines) stratify patients into risk categories:
- High-Risk FN: Anticipated prolonged neutropenia (>7 days), profound neutropenia (ANC <100 cells/mm³), acute myeloid leukemia (AML), relapsed leukemia, HSCT conditioning, hemodynamic instability, medical comorbidities, high-grade mucositis, or new pulmonary infiltrates. Mandates immediate hospitalization and parenteral antipseudomonal beta-lactam monotherapy.
- Low-Risk FN: Anticipated brief neutropenia (<7 days), solid tumors receiving maintenance cycles, ANC expected to recover rapidly, hemodynamically stable, no focal source. Select patients may qualify for outpatient management in validated protocols.
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| Empiric Beta-Lactam Monotherapy Regimens in High-Risk FN |
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| Drug | Pediatric FN Dosing | Spectrum & Clinical Features |
|---------------------|-------------------------------------|-------------------------------------|
| Cefepime (IV) | 150 mg/kg/day divided every 8 hours | Potent Pseudomonas & Gram-negative |
| | (50 mg/kg/dose q8h; max 2000 mg) | bacilli; excellent MSSA and strep |
| | | coverage. Standard first-line. |
| Piperacillin- | 300 to 400 mg/kg/day piperacillin | Antipseudomonal plus broad enteric |
| tazobactam (IV) | divided q6-8h (Max 16 g/day) | anaerobic coverage. Preferred if |
| | | typhlitis / GI symptoms present. |
| Meropenem (IV) | 60 to 120 mg/kg/day divided q8h | Broadest spectrum; reserved for |
| | (20-40 mg/kg/dose q8h; max 2000 mg) | septic shock, ESBL colonization, |
| | | or severe beta-lactam allergy. |
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The Rationale for Monotherapy vs Dual Therapy
Historic protocols combined an antipseudomonal beta-lactam with an aminoglycoside (e.g., tobramycin). Multiple large randomized pediatric trials and Cochrane meta-analyses demonstrated that beta-lactam monotherapy achieves identical survival and infection clearance compared to beta-lactam plus aminoglycoside combinations, while completely avoiding aminoglycoside-associated nephrotoxicity and ototoxicity. Aminoglycosides are reserved for patients with septic shock or known resistant pathogens.
Indications for Empiric Vancomycin Addition & Stewardship Rules
Routine empiric addition of vancomycin to initial pediatric FN regimens provides no survival advantage and increases rates of acute kidney injury and vancomycin-resistant enterococci (VRE).
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| Specific Criteria for Adding Empiric Vancomycin in FN |
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| Indication 1 | Hemodynamic instability, sepsis-induced hypotension, or septic shock. |
| Indication 2 | Clinically apparent central venous catheter site infection (purulence, |
| | erythema, tenderness at the tunnel or port pocket). |
| Indication 3 | Preliminary blood cultures positive for Gram-positive cocci (prior to ID)|
| Indication 4 | Known colonization with MRSA or penicillin-resistant S. pneumoniae. |
| Indication 5 | Severe oral mucositis (Grade 3/4) predisposing to viridans streptococcal |
| | bacteremia and catastrophic toxic shock. |
| Indication 6 | Apparent skin, soft tissue, or bone/joint infection. |
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The 48-Hour Stewardship Discontinuation Rule: If vancomycin was initiated at presentation and subsequent blood cultures show no Gram-positive bacterial growth at 48 hours, vancomycin MUST be discontinued immediately, even if the patient remains febrile.
3. Central Line-Associated Bloodstream Infections (CLABSI)
Central venous access devices (tunneled catheters [Broviac, Hickman], implanted ports [Port-a-Cath], and PICCs) are essential for chemotherapy and supportive care but represent the primary conduit for intraluminal and extraluminal bacterial biofilm colonization.
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| CLABSI Microbiology & Catheter Management Strategy |
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| Pathogen | Relative Frequency | Management: Removal vs Salvage |
|------------------------------|--------------------|-------------------------------------|
| Coagulase-Negative Staph | Most common | Line salvage possible in stable pts.|
| (S. epidermidis; CoNS) | (~30-40%) | Systemic abx + lock therapy x 10-14d|
| Staphylococcus aureus | High virulence | MANDATORY LINE REMOVAL. |
| (MSSA and MRSA) | (~15-20%) | High risk of endocarditis/emboli. |
| Candida species | High mortality | MANDATORY LINE REMOVAL. |
| (C. albicans, parapsilosis) | (~10-15%) | Fungal biofilms cannot be sterilized|
| Pseudomonas aeruginosa | Enteric / nosocomial| MANDATORY LINE REMOVAL. |
| | (~5-10%) | High relapse and tissue invasion. |
| Enterobacteriaceae | Enteric | Salvage possible if uncomplicated; |
| (E. coli, Klebsiella) | (~15-20%) | remove if bacteremia persists >72h. |
| Non-tuberculous Mycobacteria | Opportunistic | MANDATORY LINE REMOVAL. |
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Mandatory Indications for Central Venous Catheter Removal
Per IDSA catheter-related infection guidelines, central lines MUST be promptly removed in the presence of:
- Blood cultures yielding Staphylococcus aureus, Candida species, Pseudomonas aeruginosa, or non-tuberculous mycobacteria.
- Severe sepsis, septic shock, or hemodynamic instability attributable to the line.
- Suppurative thrombophlebitis, endocarditis, or metastatic septic emboli.
- Tunnel infection or subcutaneous port pocket abscess (infection tracking beyond the catheter exit site cannot be cleared with systemic antibiotics).
- Persistent bacteremia >72 hours despite appropriate targeted antimicrobial therapy.
Catheter Salvage & Antimicrobial Lock Therapy (ALT)
When vascular access is critical and the infecting pathogen is low-virulence (e.g., coagulase-negative staphylococci) in an uncomplicated, stable patient without tunnel tract involvement, catheter salvage may be attempted using systemic therapy combined with Antimicrobial Lock Therapy (ALT).
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| Antimicrobial Lock Therapy (ALT) Formulations |
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| Lock Agent | Typical Concentration | Clinical Nuances |
|----------------------|-------------------------------------|------------------------------------|
| Vancomycin Lock | 2 to 5 mg/mL in normal saline | Combined with heparin (10-100 U/mL)|
| | | Superb against CoNS biofilms. |
| Cefazolin Lock | 5 to 10 mg/mL in normal saline | Combined with heparin for MSSA. |
| Gentamicin Lock | 1 to 2 mg/mL in normal saline | Utilized for sensitive GNBs. |
| 70% Ethanol Lock | 70% Ethyl alcohol | Denatures biofilm proteins/lipids; |
| | (Preservative-free) | risk of catheter degradation & |
| | | plasma protein precipitation. |
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- Mechanism of Action: Bacteria in biofilms enter a slow-growing, metabolically quiescent state protected by an extracellular polysaccharide slime layer, resisting standard serum antibiotic levels. ALT instills concentrations 100 to 1000 times higher than the MIC directly into the catheter lumen, dwelling for 8 to 24 hours per day for 10 to 14 days.
- Ethanol Lock Pearls: 70% ethanol is a non-antibiotic agent that rapidly dissolves lipid envelopes and denatures proteins across bacteria and fungi, preventing antimicrobial resistance selection. However, clinicians must be alert to risks: prolonged exposure can compromise the tensile strength of certain polyurethane catheters, cause intraluminal catheter occlusions due to plasma protein precipitation, and produce systemic intoxication if accidentally flushed into low-birth-weight neonates.
An 8-year-old child with pre-B cell acute lymphoblastic leukemia (ALL) receiving maintenance chemotherapy presents to the emergency department with a single oral temperature of 38.9°C (102.0°F). Complete blood count reveals WBC 800 cells/mcL with 10% segmented neutrophils, 5% bands, and 85% lymphocytes (ANC = 120 cells/mm³). The child is alert, hemodynamically stable (BP 102/64 mmHg, HR 108 bpm), has a well-healed port-a-cath without erythema or drainage, and has no focal physical findings. Which empiric antimicrobial regimen is most appropriate?
A 5-year-old patient with neuroblastoma has a double-lumen tunneled central venous catheter (Broviac). The child develops fever and rigors during an infusion. Aerobic blood cultures drawn from both catheter lumens and a peripheral vein flag positive for yeast at 24 hours, subsequently identified as Candida albicans. The oncology fellow suggests attempting catheter salvage using a vancomycin-heparin lock and systemic intravenous micafungin. What is the standard of care regarding central line management in this patient?
A 6-year-old child weighing 20 kg presents to the pediatric intensive care unit in septic shock secondary to ruptured appendicitis. After receiving two 20 mL/kg boluses of Lactated Ringer's solution (total 800 mL), the child remains hypotensive (BP 72/38 mmHg) with a heart rate of 165 bpm, capillary refill of 4 seconds, cool and clammy extremities, and weak, thready peripheral pulses. Blood pressure shows a narrow pulse pressure. Which vasoactive infusion is the preferred first-line agent to restore hemodynamic stability in this patient?