PALS | Respiratory Distress & Failure Extended

During the copy past its throwing a lot of weird symbols. I think the information is still helpful

PALS Respiratory Distress & Failure: 80/20 Core Summary

1. Core Pathophysiology & Definitions

• Respiratory Distress: Clinical state with increased respiratory rate and effort (tachypnea, retractions, nasal flaring) while maintaining adequate gas exchange1more_horiz.
• Respiratory Failure: Inadequate oxygenation, ventilation, or both, causing tissue hypoxia and hypercarbia3more_horiz. In pediatrics, failure rapidly leads to cardiac arrest if uncorrected13.
• Hypoxemia: $\text{SpO}_2 < 94\%$ on room air4. Caused by V/Q mismatch, hypoventilation, diffusion defects, or shunts6. Early signs: tachypnea, tachycardia, agitation; late signs: bradypnea, bradycardia, seesaw breathing, lethargy7.
• Hypercarbia: Elevated $\text{PaCO}_2$ resulting in respiratory acidosis5. Lacks visual signs like cyanosis; suspect when agitation converts to decreased consciousness despite oxygen therapy5.

2. Four Clinical Types of Respiratory Problems

• Upper Airway Obstruction (Croup, foreign body aspiration, epiglottitis)8:
  • Key Signs: Inspiratory stridor, barking cough, hoarseness, inspiratory retractions, and poor air entry89.
• Lower Airway Obstruction (Asthma, bronchiolitis)810:
  • Key Signs: Expiratory wheezing, prolonged expiratory phase with active effort, and tachypnea910.
• Lung Tissue Disease (Pneumonia, pulmonary edema, ARDS)10:
  • Key Signs: Grunting (glottic closure maintaining PEEP), crackles (rales), diminished breath sounds, and severe hypoxemia9more_horiz.
• Disordered Control of Breathing (Seizures, head injury, drug overdose)11:
  • Key Signs: Variable/irregular pattern (alternating tachypnea/bradypnea), central apnea, shallow respirations, and altered mental status911.

3. Severity Spectrum: Distress vs. Failure

Early recognition prevents progression from distress to failure and cardiac arrest19:

• Airway Patency: Open and maintainable $\rightarrow$ Not maintainable9.
• Rate & Effort: Tachypnea & increased effort $\rightarrow$ Bradypnea, inadequate effort, or apnea9.
• Air Movement: Good air entry $\rightarrow$ Poor to absent air movement9.
• Heart Rate: Tachycardia (compensatory) $\rightarrow$ Bradycardia (critical late sign of impending arrest)79.
• Skin Appearance: Pallor/mottling $\rightarrow$ Cyanosis3more_horiz.
• Mental Status: Anxiety & agitation $\rightarrow$ Lethargy & unresponsiveness5more_horiz.

4. High-Yield 80/20 Clinical Pearls

• Bradycardia is a Red Flag: Hypoxia-induced bradycardia indicates imminent cardiopulmonary arrest79.
• Grunting Mechanism: Glottic closure during expiration preserves PEEP to prevent alveolar collapse11.
• Decreased Effort $\neq$ Recovery: Reduced work of breathing with depressed mental status signals fatigue and failure39.