respiratory critical-care
Plethysmographic Variability Index (PVI) / Fluid Responsiveness
Non-invasive assessment of fluid responsiveness using respiratory variation in pulse oximetry plethysmographic waveform amplitude.
Score interpretation
Not fluid-responsive
→ Avoid further fluid boluses; assess for other causes of haemodynamic instability
Likely fluid-responsive (PVI >=14%)
→ Consider cautious fluid challenge (250-500 mL); reassess after each bolus
Interpretation bands for the PVI / Fluid Responsiveness. Apply clinical judgement and local guidance.
References
Related
Curated clinical cross-links plus same-class fallbacks.
Drugs
- Potassium chloride with calcium chloride and sodium chloride · Crystalloid IV fluid
- Potassium chloride with calcium chloride sodium chloride and sodium lactate · Balanced crystalloid IV fluid
- Potassium chloride with glucose · IV fluid (potassium + dextrose)
- Potassium chloride with glucose and sodium chloride · IV fluid (mixed)
- Potassium chloride with sodium chloride · IV fluid (potassium + saline)
- Sodium chloride · Saline IV fluid / replacement
Pathways
- Acute Asthma in Adults · BTS/SIGN British Guideline on Asthma 2019; NICE NG80
- Pulmonary Embolism Assessment · NICE NG158; ESC 2019 PE Guidelines
- Acute Exacerbation of COPD (AECOPD) · NICE NG115; GOLD 2024
- Spontaneous Pneumothorax (Adult) · BTS Pleural Disease 2023
- Atypical Pneumonia (Legionella / Mycoplasma / Chlamydophila) · BTS 2023; IDSA
- COPD Exacerbation Management · NICE NG115 / GOLD 2024
Decision support only — verify against a current formulary, NICE, or your local guideline before clinical use.