Somogyi effect refers to?

Appeared in: AIIMS M.Sc. Nsg Entrance exam-2026

Explanation

The Somogyi effect is a physiological response to nocturnal hypoglycemia (low blood sugar at night).
The body attempts to correct the low blood sugar by releasing counter-regulatory hormones like glucagon and cortisol.
This hormonal surge causes the liver to release excess glucose, resulting in rebound hyperglycemia (high blood sugar) in the morning.
The key characteristic is the sequence: low blood sugar at night followed by high blood sugar in the morning.

Option A: This describes the Dawn phenomenon, which is a natural rise in blood sugar in the early morning due to hormonal surges (like growth hormone) and is not preceded by hypoglycemia.
Option B: Persistent hyperglycemia due to insulin deficiency is a general description of uncontrolled type 1 diabetes, not the specific pattern of the Somogyi effect.
Option D: A local allergic reaction is a skin-level immune response at the injection site, characterized by redness, swelling, or itching. It is unrelated to the systemic blood glucose regulation patterns of the Somogyi effect.

Visual 1: Flowchart: Illustrating the sequence of the Somogyi effect: Excessive evening insulin -> Nocturnal hypoglycemia (2-3 AM) -> Counter-regulatory hormone release -> Hepatic glucose output -> Morning rebound hyperglycemia.
Visual 2: Graph: Comparing 24-hour blood glucose patterns in the Somogyi effect (dip then spike) versus the Dawn phenomenon (steady then rise).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Somogyi effect and its differentiation from the Dawn phenomenon as background academic context rather than a clinical decision trigger.
The most critical nursing action is to differentiate between the Somogyi effect and the Dawn phenomenon, as their management is opposite. Increasing insulin for a Somogyi effect is dangerous and worsens the problem.
A key patient safety intervention is checking blood glucose between 2 AM and 3 AM. This single data point is essential for correct diagnosis and treatment adjustment.
What if? If a patient reports high morning sugars and the nurse simply increases the evening insulin dose without checking for nocturnal hypoglycemia, the patient is put at high risk for a severe hypoglycemic event overnight, which can lead to seizures, coma, or even death.

How to Approach the Question

First, identify the core concept in the question stem: 'Somogyi effect'.
Recall the definition of the Somogyi effect. The key is that it's a 'rebound' or 'reactionary' process.
Analyze the options to find the one that describes a rebound pattern.
Option C describes a low followed by a high ('nocturnal hypoglycemia followed by rebound morning hyperglycemia'), which perfectly matches the definition of the Somogyi effect.
Eliminate the other options. Option A defines the Dawn phenomenon. Options B and D describe other unrelated diabetes issues.

Concept Tested & Keywords

Concept Tested: Somogyi effect and its differentiation from the Dawn phenomenon.
Stem keywords: Somogyi effect
Lead-in keywords: refers to
Negative lead-in flag: false

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