Suspected HHS
Patient with severe hyperglycemia, altered mental status, minimal ketosis
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EndocrinologyEmergency
Hyperosmolar Hyperglycemic State (HHS) Management
Hyperosmolar Hyperglycemic State (HHS) Management: Suspected HHS → Confirm HHS Diagnosis → 1. Fluid Resuscitation → 2. Insulin Therapy → 3. Potassium St...
Pathway Overview
15 steps
Algorithm Steps
15 total
01Start 02Decision Confirm HHS Diagnosis
All 4 criteria required
- Glucose ≥600 mg/dL (33.3 mmol/L)
- Effective osmolality >300 mOsm/kg OR total >320 mOsm/kg
- β-hydroxybutyrate <3.0 mmol/L OR urine ketones ≤2+
- pH ≥7.3 AND bicarbonate ≥15 mmol/L
03Action 1. Fluid Resuscitation
Cornerstone of HHS therapy - prioritize over insulin
- Initial: 0.9% NaCl 15-20 mL/kg/hr (or 1-1.5L) in first hour
- 2024 update: Balanced crystalloids (LR/PlasmaLyte) preferred when available
- Subsequent: Based on corrected sodium and hemodynamics
- If corrected Na+ high/normal: 0.45% NaCl 250-500 mL/hr
- If corrected Na+ low: Continue 0.9% NaCl 250-500 mL/hr
- Goal: Positive fluid balance 3-6L in first 12 hours
- Smaller boluses (250mL) in elderly/CHF/CKD
04Action 2. Insulin Therapy
Start AFTER initial fluid bolus - use LOWER dose than DKA
- Regular insulin 0.05 units/kg/hr IV infusion (HALF the DKA dose)
- HHS requires less aggressive insulin than DKA
- Target glucose decline: ≤90-120 mg/dL/hr (slower than DKA)
- When glucose reaches 250-300 mg/dL: Reduce to 0.02-0.05 units/kg/hr
- Add dextrose (D5) when glucose <300 mg/dL
- Rapid glucose/osmolality drop risks cerebral edema
05Decision 3. Potassium Status
Check K+ before and during insulin
06Action K+ <3.3 mEq/L
HOLD insulin until K+ ≥3.3
- Give 20-40 mEq KCl/L IV fluid
- Recheck K+ every 1-2 hours
- Resume insulin when K+ ≥3.3 mEq/L
07Action 4. Continuous Monitoring
Close laboratory and clinical monitoring
- Glucose: every 1 hour
- BMP (Na, K, Cl, HCO3, Cr): every 2-4 hours
- Osmolality: every 2-4 hours
- Fluid balance and urine output
- Mental status assessment
- Identify and treat precipitating cause
08Decision HHS Resolution Criteria?
2024 Consensus criteria for resolution
- Serum osmolality ≤310 mOsm/kg
- Patient alert and oriented
- Glucose <250 mg/dL (13.9 mmol/L)
09Action Transition to SubQ Insulin
When resolution criteria met and patient eating
- Start basal-bolus insulin 1-2 hours BEFORE stopping IV insulin
- Calculate total daily dose based on IV insulin requirements
- 50% basal, 50% prandial distribution
- Do NOT stop IV insulin until SubQ on board
10Outcome HHS Resolved
Discharge planning, diabetes education, follow-up
11Action Continue IV Treatment
If criteria not met
- Continue IV fluids and insulin
- Reassess every 2-4 hours
- Evaluate for complications
- Search for unresolved precipitant
- Path rejoins step 07Shared downstream outcome
12Warning ICU Care Required
Severe HHS, hemodynamic instability, altered consciousness
13Action K+ 3.3-5.3 mEq/L
Continue insulin, replace K+
- Add 20-30 mEq KCl per liter IV fluid
- Maintain K+ 4-5 mEq/L
- Monitor every 2-4 hours
- Path rejoins step 07Shared downstream outcome
14Action K+ >5.3 mEq/L
Continue insulin, hold K+ replacement
- Do not add K+ to IV fluids
- Recheck every 2 hours
- Begin replacement when K+ <5.3 mEq/L
- Path rejoins step 07Shared downstream outcome
15Warning ⚠️ Osmolality Warning
Avoid rapid correction of osmolality
- Target decrease: 3 mOsm/kg/hr
- Rapid correction risks cerebral edema
- Monitor mental status closely
Guideline Source
Hyperglycemic Crises in Adults With Diabetes: A Consensus Report (ADA/AACE/EASD/JBDS/DTS 2024)
Clinical Safety Information
Clinical Decision Support — Not a Substitute for Clinical Judgment
Individual patient factors may require deviation from these recommendations.
Known Limitations
- Does not address pediatric HHS
- Does not cover mixed DKA/HHS presentations in detail
- Requires laboratory monitoring capabilities
- Does not address underlying precipitant management
Contraindicated Populations
pediatric
Applicable Regions
USEUUK
UK: Aligned with JBDS inpatient care guidelines
US: Based on ADA/AACE consensus recommendations
Version 1Next review: 2028-01-01
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Related Resources
Frequently Asked Questions
What is the Hyperosmolar Hyperglycemic State (HHS) Management?
The Hyperosmolar Hyperglycemic State (HHS) Management is a emergency clinical algorithm for Endocrinology. It provides a structured decision tree to guide clinical decision-making, based on Hyperglycemic Crises in Adults With Diabetes: A Consensus Report (ADA/AACE/EASD/JBDS/DTS 2024).
What guideline is the Hyperosmolar Hyperglycemic State (HHS) Management based on?
This algorithm is based on Hyperglycemic Crises in Adults With Diabetes: A Consensus Report (ADA/AACE/EASD/JBDS/DTS 2024) (DOI: 10.2337/dci24-0032).
What are the limitations of the Hyperosmolar Hyperglycemic State (HHS) Management?
Known limitations include: Does not address pediatric HHS; Does not cover mixed DKA/HHS presentations in detail; Requires laboratory monitoring capabilities; Does not address underlying precipitant management. Individual patient factors may require deviation from these recommendations.
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