Are bedside features of shock reproducible between different observers?

Area of Science:

• Pediatric Emergency Medicine
• Global Health
• Clinical Diagnostics

Background:

• Shock is frequently under-reported in children in developing nations.
• Clinical signs like capillary refill time, temperature gradient, pulse volume, and dehydration signs are vital for emergency assessment of critically ill children.
• Limited data exist on the validity and inter-observer reliability of these commonly used shock indicators.

Purpose of the Study:

• To evaluate the inter-observer agreement of readily obtainable clinical signs used in the emergency assessment of pediatric shock.
• To assess the reliability of specific indicators, including capillary refill time, temperature gradient, pulse volume, and signs of dehydration, in a resource-limited setting.

Main Methods:

• A study involving 100 consecutive children admitted to a pediatric ward in coastal Kenya.
• Clinical sign recognition training was provided to observers prior to data collection.
• Inter-observer agreement was assessed for delayed capillary refill time (> or =4 s), temperature gradient, weak pulse volume, and skin turgor.

Main Results:

• Moderate agreement was found for most cardiovascular compromise signs (delayed capillary refill time: kappa = 0.49; weak pulse volume: kappa = 0.4).
• Substantial agreement was observed for temperature gradient (kappa = 0.62).
• Moderate agreement was noted for skin turgor assessment (kappa = 0.55), while other hydration assessments showed lower agreement. Parameters recommended by American consensus guidelines had low to poor inter-rater reliability.

Conclusions:

• The reliability of commonly used clinical signs for assessing pediatric shock, particularly capillary refill time and pulse volume, is questionable due to low inter-observer agreement.
• Findings highlight the need for improved standardization or alternative diagnostic tools for shock assessment in pediatric emergency care, especially in developing countries.
• The study underscores challenges in applying universal guidelines in diverse clinical settings and emphasizes the importance of robust validation of diagnostic parameters.