Testing method and associated meningeal signs
Assessment of the neck muscles is performed with the patient in the supine position. The physician performs smooth passive flexion of the head forward, attempting to bring the subject's chin close to the sternum. With a positive test, flexion is impossible due to pronounced muscular resistance.
As part of a neurological examination, nuchal rigidity is evaluated in combination with other meningeal tests:
- Upper Brudzinski sign: tested concurrently with head flexion; a positive response is considered to be involuntary leg retraction with flexion at the knee and hip joints.
- Kernig sign: the leg is flexed at the hip and knee joints at a right angle, after which an attempt is made to straighten the knee. Tension in the lower leg flexors makes full extension impossible.
- Middle Brudzinski sign: reflex flexion of both legs in response to mechanical pressure in the pubic symphysis area.
- Lower Brudzinski sign: involuntary flexion of the contralateral leg at the moment of performing the Kernig test.
- Bechterew sign: appearance of a pain grimace on the side of percussion and increased headache upon percussion of the zygomatic arch.
Main causes of development and differential diagnosis
The appearance of muscle rigidity indicates irritation of the cerebral meninges. In clinical practice, this sign is most characteristic of the following conditions:
- Subarachnoid hemorrhage (SAH): most commonly develops due to spontaneous rupture of a saccular aneurysm of the arteries of the circle of Willis. Extravasated blood causes acute irritation of the brain membranes. The attack is manifested by sudden thunderclap headache ("the worst headache of my life") with the addition of meningism.
- Meningitis: infectious inflammation of the meninges. The presence of meningeal syndrome always requires differentiation between infection and SAH.
- Intracranial hypertension and hydrocephalus: in adults and children with closed fontanelles, occlusion of the cerebrospinal fluid pathways is accompanied by headache, morning projectile vomiting, photophobia, opisthotonos, and head retraction.
Age-related features of the clinical picture
Manifestations of meningeal syndrome differ significantly depending on the patient's age.
| Parameter / Age | Neonates and infants | Adults and older children |
|---|---|---|
| Timing of rigidity onset | Manifests only in late stages of inflammation | Appears acutely from the first hours of meningeal involvement |
| Leading debut signs | Nonspecific intoxication, "cerebral" cry, fontanelle bulging | Intense cephalgia, nausea, fasting vomiting |
| Additional symptoms | Setting-sun sign, upward gaze palsy, frequent regurgitation | Papilledema, abducens nerve palsy, opisthotonos |
Diagnostic confirmations in the presence of rigidity
Upon detecting nuchal rigidity, the examination is aimed at the immediate search for the cause of the lesion:
- Computed tomography (CT) and magnetic resonance imaging (MRI): allow visualization of subarachnoid blood, ventricular system enlargement in hydrocephalus, and the exclusion of space-occupying collections (e.g., subdural hematomas).
- Lumbar puncture: a mandatory method for verifying the nature of the lesion (detection of blood or inflammatory changes).
- Cerebral angiography: performed when vascular genesis is suspected (search for saccular, fusiform, or mycotic aneurysms of the base of the brain arteries).
The rule of three "B"s for meningeal syndrome: Brudzinski (leg flexion upon head tilt or pubic pressure), Bechterew (pain from the zygomatic bone), and Neck block (nuchal rigidity).
Class and exam questions
Why does nuchal rigidity occur in subarachnoid hemorrhage?
Upon aneurysm rupture, blood enters the subarachnoid space and exerts a direct irritating effect on the pain receptors of the meninges, which triggers a protective spasm of the neck muscles.
How to distinguish true nuchal rigidity during examination?
The patient lies supine; the physician passively tilts their head forward. With a positive sign, the chin cannot be brought to the sternal manubrium due to reflex resistance of the neck muscles.
Why is nuchal rigidity not an early sign of meningitis in newborns?
In newborns, the disease debuts with nonspecific symptoms (lethargy, fever, regurgitation) and fontanelle bulging, while classical meningeal signs form only at late stages of the pathology.
What else to study on this topic
- Endovascular coil embolization in saccular cerebral artery aneurysms
- Mycotic aneurysms of small arteries: pathogenesis and conservative treatment
- Anatomic localization of aneurysms of the circle of Willis and vertebrobasilar system
- Pathogenesis of chronic subdural hematoma and the role of bridging veins
- Indications for cerebrospinal fluid shunting operations in obstructive hydrocephalus
- Decompressive neurosurgical interventions in TBI and strokes
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