Scoring Systems in PICU

Mortality Prediction and General Severity Scores

• The assessment of the overall severity of illness and the predicted mortality of patients admitted to the PICU is routinely calculated using comprehensive mortality scoring systems.
• The Pediatric Risk of Mortality (PRISM) score is a widely utilized objective tool designed to evaluate the severity of illness and predict the mortality risk in critically ill children.
• The Pediatric Index of Mortality (PIM), along with its updated iteration, PIM2, are also extensively applied in PICUs to estimate the predicted mortality rate and assess unit performance.
• These generic severity scoring systems utilize a combination of clinical parameters, physiological variables, and laboratory derangements captured at the time of PICU admission to quantify the severity of the illness.
• Note: While the provided sources highlight the critical role of PRISM, PIM, and PIM2 in PICU mortality prediction, the specific physiological variables and mathematical weightings comprising these scores are not detailed in the uploaded documents; independent verification of these specific variables may be required.

Initial Triage and Acuity Scoring

• The Pediatric Assessment Triangle (PAT) serves as a rapid severity scoring tool that relies on immediate visual and auditory assessment without the need for equipment.
• It categorizes clinical severity across three domains: Appearance (using the 'TICLS' mnemonic for Tone, Interactiveness, Consolability, Look/Gaze, and Speech), Breathing (work of breathing, abnormal airway sounds), and Color (pallor, mottling, cyanosis).
• Based on these initial physiological parameters, the Five-Level Triage Acuity System scores severity to strictly define the urgency of care required:
  • Level 1 (Resuscitation): Indicates life-threatening conditions requiring immediate intervention within 1-5 minutes (e.g., cardiopulmonary arrest, decompensated shock, Glasgow Coma Scale < 10).
  • Level 2 (Emergent): Represents serious conditions requiring treatment within 15 minutes (e.g., severe respiratory distress, Glasgow Coma Scale 10-13).
  • Level 3 (Urgent): Significant problems requiring treatment within 30 minutes.
  • Level 4 (Less Urgent): Stable conditions that must be evaluated within 1 hour.
  • Level 5 (Non-Urgent): Stable conditions that can be evaluated within 2 hours.

Neurological Severity Scoring Systems

• The Modified Glasgow Coma Scale (GCS) provides an objective numerical score of the depth of consciousness by evaluating three parameters: eye opening (score 1-4), verbal response (score 1-5), and motor response (score 1-6).
• A GCS score of $\le$ 8 denotes a severe reduction in the level of consciousness, representing a critical state that typically necessitates immediate airway protection and endotracheal intubation.
• The Full Outline of Unresponsiveness (FOUR) Score is a highly objective scoring system that offers superior predictive value compared to the GCS in intubated patients and in children presenting with very low GCS scores.
• The FOUR score evaluates four specific neurological domains, each scored from 0 to 4: Eye response, Motor response, Brainstem reflexes (pupil, corneal, and cough reflexes), and Respiration (breathing patterns and ventilator synchrony).
• The Coma Recovery Scale - Revised (CRS-R) is utilized to assess severity and monitor clinical emergence in comatose patients. It comprises 23 items across 6 sub-scales (auditory, visual, motor, oromotor, communication, and arousal), yielding a total score ranging from 0 (worst) to 23 (best), which assists in differentiating a vegetative state from a minimally conscious state.

Respiratory Severity Scoring Systems

• The Oxygenation Index (OI) and Oxygen Saturation Index (OSI) are critical severity scores utilized by the Pediatric Acute Lung Injury Consensus Conference (PALICC) to strictly define the severity of Pediatric Acute Respiratory Distress Syndrome (PARDS).
• The severity of PARDS is mathematically scored as follows:
  • Mild: OI 4 to <8, or OSI 5 to <7.5.
  • Moderate: OI 8 to <16, or OSI 7.5 to <12.3.
  • Severe: OI $\ge$ 16, or OSI $\ge$ 12.3.
• The Pediatric Respiratory Assessment Measure (PRAM) Score quantifies acute asthma severity based on the presence of suprasternal retractions, scalene muscle contraction, air entry, wheezing, and oxygen saturation.
• PRAM scores are classified into specific severity tiers: Mild (0-3), Moderate (4-7), and Severe (8-12).
• The Becker Asthma Score is an alternative rapid severity assessment tool that utilizes respiratory rate, wheezing, inspiratory-to-expiratory ratio, and accessory muscle use. A Becker score of $\ge$ 7 indicates severe status asthmaticus necessitating immediate PICU admission.
• Westley’s Croup Severity Score objectively assesses upper airway obstruction severity using parameters including consciousness level, cyanosis, stridor, air entry, and retractions. The severity is meticulously graded as Mild (0-2), Moderate (3-5), Severe (6-11), and Impending respiratory failure (12-17).

Oncologic and Metabolic Severity Scoring

• The Cairo-Bishop Criteria provide an essential grading system to quantify the severity of clinical Tumor Lysis Syndrome (TLS) in the PICU setting.
• The severity of TLS is scored from Grade 0 up to Grade 5 (Death) based on the specific degree of serum creatinine elevation, the clinical presence and severity of cardiac arrhythmias, and the occurrence and medical control of seizures.