## Compartment Pressure Measurement Techniques **Key Point:** The slit catheter technique is the most accurate and reliable method for measuring intracompartmental pressure in suspected compartment syndrome. ### Slit Catheter Technique: Gold Standard **High-Yield:** The slit catheter (or Whitesides catheter) technique is preferred because: - Most accurate and reproducible method - Minimally invasive - Can be performed at bedside - Allows repeated measurements - Directly connected to a pressure transducer for real-time readings - Validated against clinical outcomes ### Technical Details 1. **Setup:** 18-gauge needle with attached slit catheter connected to a saline-filled column and pressure transducer 2. **Insertion:** Needle inserted into the compartment at the level of maximal swelling 3. **Reading:** Pressure measured at the level of the compartment 4. **Interpretation:** Pressure ≥30 mmHg or within 30 mmHg of diastolic BP = fasciotomy indicated **Clinical Pearl:** The slit catheter can remain in place for serial measurements, allowing assessment of pressure trends over time. This is particularly useful in borderline cases. ### Alternative Methods (Less Accurate) | Method | Limitation | | --- | --- | | Needle manometry | Less accurate, single reading only | | Wick catheter | Slower response time, less reliable | | Transducer-tipped catheter | More expensive, not routinely available | **Warning:** Do NOT use imaging (CT, MRI) as the primary diagnostic tool. While they may show compartment edema, they do not provide pressure measurements and delay critical treatment. **Mnemonic:** **SLIT** — **S**peedy, **L**ow-cost, **I**nvasive minimally, **T**ransducer-connected. [cite:Campbell's Operative Orthopaedics 13e Ch 56] 
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