📈 The F-K-I Engine: This algorithm mathematically coordinates Fluids, Kalium (Potassium), and Insulin. It automatically calculates corrected sodium and intercepts premature insulin cessation based on physiological parameters.
1. Patient Baseline & Vitals
2. Laboratory Biomarkers
Acute Management Pathway
Corrected Sodium
–mEq/L
Continuous Insulin Rate
–U/hr
📚 Bedside Educational PearlsThe "F-K-I" Sequence of Priorities
In hyperglycaemic crises, always execute management in this strict sequence. Deviating from this order invites mortality.
F - Fluids First: Reverse severe volume depletion, restore renal perfusion, and clear glucose through the kidneys. Initial fluids immediately drop blood sugar even before insulin is given.
K - Kalium (Potassium) Second: DKA causes profound total-body K+ depletion. You must secure a serum K+ ≥ 3.3 mEq/L before initiating insulin.
I - Insulin Third: Only after volume is expanding and potassium is safe do you start the insulin drip to shut down ketogenesis.
The Illness Scripts: DKA vs HHS
Feature
Diabetic Ketoacidosis (DKA)
Hyperosmolar Hyperglycaemic State (HHS)
Demographic
Usually younger, Type 1 DM (or ketosis-prone Type 2).
Usually elderly, Type 2 DM, with restricted access to water.
Onset
Rapid (hours to a few days).
Insidious (days to weeks).
Pathophysiology
Absolute insulin deficiency drives rampant lipolysis and ketogenesis.
Relative insulin deficiency. There is just enough insulin to prevent ketosis, but not enough to utilize glucose, leading to extreme hyperglycaemia.
Profound dehydration, hyperosmolality, and severe altered mental status (confusion to coma).
⚠ The Insulin Analogue Marketing Trap
Do NOT waste patient resources on IV Insulin Analogues.
Medical representatives sometimes promote rapid-acting analogues (Aspart, Lispro, Glulisine) for IV use in DKA. This is scientifically flawed. The only difference between regular human insulin and rapid-acting analogues is their absorption rate from the subcutaneous (SC) fat layer.
When injected directly into a vein (IV), standard Regular Human Insulin has the exact same immediate onset and short half-life as expensive analogues. Use standard Regular Human Insulin for the IV drip. You may switch to rapid-acting analogues later when transitioning to the SC regimen.
The Dextrose Clamp (Preventing Premature Cessation)
A classic resident error: Stopping the insulin drip the moment blood glucose normalises (drops below 200 mg/dL).
The Physiology: DKA is a crisis of ketosis, not just hyperglycaemia. Insulin is the only thing that chemically clears the ketones. If you stop the insulin simply because the glucose is normal, ketogenesis resumes and DKA relapses immediately.
The "Clamp" Solution: When glucose hits 200 mg/dL, you must add Intravenous Dextrose (D5W) to the fluids. You are deliberately infusing sugar to "clamp" the blood glucose at a safe level (150-200 mg/dL), which allows you to safely keep the insulin drip running until the anion gap fully closes.
⚠ The IV Sodium Bicarbonate Fallacy
IV Sodium Bicarbonate is unfortunately overused in Indian hospitals for resolving acidemia. ADA guidelines strongly discourage its routine use.
Worsens Intracellular Acidosis: Bicarbonate converts to CO2. CO2 crosses the blood-brain barrier and cell membranes instantly, while bicarbonate does not. This paradoxically acidifies the brain and intracellular space.
Tissue Hypoxia: It shifts the oxygen-dissociation curve to the left, decreasing oxygen delivery to struggling tissues.
Indication: It is reserved strictly for patients with a pH < 6.9 to prevent impending cardiovascular collapse, and even then, its mortality benefit is debated.
◆ Criteria for Resolution & Subcutaneous Transition
Do not transition off the drip until strict resolution criteria are met.
State
Resolution Criteria
DKA
Blood glucose < 200 mg/dL AND two of the following: - Serum bicarbonate ≥ 15 mEq/L - Venous pH > 7.30 - Calculated anion gap ≤ 12 mEq/L
HHS
Normal calculated serum osmolality AND recovery of normal mental status.
⚠ The Overlap Trap: You MUST administer the first dose of subcutaneous basal insulin (e.g., Glargine) 1 to 2 hours BEFORE stopping the IV insulin infusion. IV Regular insulin has a half-life of minutes. If you stop the drip without overlapping SC insulin, the patient will rebound into DKA within hours.
American Diabetes Association. Standards of Medical Care in Diabetes—2025. Diabetes Care. 2025;48(Suppl 1).
Kitabchi AE, Umpierrez GE, Miles JM, Fisher JN. Hyperglycemic crises in adult patients with diabetes. Diabetes Care. 2009;32(7):1335-1343.
Fayfman M, Pasquel FJ, Umpierrez GE. Management of Hyperglycemic Crises: Diabetic Ketoacidosis and Hyperosmolar Hyperglycemic State. Med Clin North Am. 2017;101(3):587-606.
Indian Council of Medical Research (ICMR). Standard Treatment Workflows (STWs) in Endocrinology: Diabetic Ketoacidosis. Department of Health Research, Ministry of Health and Family Welfare, Government of India; 2023.
Research Society for the Study of Diabetes in India (RSSDI). RSSDI Clinical Practice Guidelines for the Management of Hyperglycemia in Hospitalized Patients. 2025.
Chawla R, Madhu SV, Makkar BM, Ghosh S, Saboo B, Kalra S; RSSDI-ESI Consensus Group. RSSDI-ESI Clinical Practice Recommendations for the Management of Type 2 Diabetes Mellitus. Indian J Endocrinol Metab. 2020;24(1):1-122.
How to Cite This Tool
AMA Style:
Umakanth S. DKA & HHS Resolution Protocol. MEDiscuss. Published 2026. Accessed .
Vancouver Style:
Umakanth S. DKA & HHS Resolution Protocol [Internet]. MEDiscuss.org; 2026 [cited ]. Available from:
