How does the Holliday-Segar method work?

How does the Holliday-Segar method work?

• A. For each 100 calories metabolized 100 mL of water will be required; fluid rates can be adjusted based on fever and tachypnea
• B. It uses body surface area to estimate fluid needs
• C. It uses age-based tables to estimate intake
• D. It calculates calories from weight to determine energy expenditure

Answer: (A)

The concept being tested is how maintenance fluid needs are estimated using the Holliday-Segar approach, which is based on body weight rather than calories, body surface area, or age alone. In this method, daily maintenance fluids are predicted with a piecewise weight-based rule: 100 mL per kg per day for the first 10 kg of body weight, 50 mL per kg per day for the next 10 kg, and 20 mL per kg per day for every kg over 20 kg. This can be translated to an hourly rate, commonly remembered as the 4-2-1 rule: 4 mL/kg per hour for the first 10 kg, 2 mL/kg per hour for the next 10 kg, and 1 mL/kg per hour for each additional kilogram. It’s a baseline that accounts for typical insensible and metabolic losses, with adjustments made for clinical factors like fever, tachypnea, vomiting, or diarrhea that can increase losses. The method does not use body surface area estimates, age-based tables, or calories to determine fluid needs, which is why those options do not describe Holliday-Segar correctly.

The concept being tested is how maintenance fluid needs are estimated using the Holliday-Segar approach, which is based on body weight rather than calories, body surface area, or age alone. In this method, daily maintenance fluids are predicted with a piecewise weight-based rule: 100 mL per kg per day for the first 10 kg of body weight, 50 mL per kg per day for the next 10 kg, and 20 mL per kg per day for every kg over 20 kg. This can be translated to an hourly rate, commonly remembered as the 4-2-1 rule: 4 mL/kg per hour for the first 10 kg, 2 mL/kg per hour for the next 10 kg, and 1 mL/kg per hour for each additional kilogram.

It’s a baseline that accounts for typical insensible and metabolic losses, with adjustments made for clinical factors like fever, tachypnea, vomiting, or diarrhea that can increase losses. The method does not use body surface area estimates, age-based tables, or calories to determine fluid needs, which is why those options do not describe Holliday-Segar correctly.