Examkin

Soru

Zorluk: KolayNeurosurgery

A 74-year-old woman is evaluated in the clinic for a 6-month history of a slow, broad-based, shuffling gait, new-onset urinary incontinence, and mild cognitive decline. The physician suspects normal pressure hydrocephalus (NPH). Arrange the following diagnostic and therapeutic steps in the standard evidence-based sequence for managing this condition, from first to last.

  1. 1Perform a non-contrast CT or MRI of the head.
  2. 2Conduct a large-volume lumbar puncture (CSF tap test).
  3. 3Reassess the patient for transient improvement in gait and cognition.
  4. 4Place a ventriculoperitoneal (VP) shunt.

Cevap

The correct sequence for managing suspected normal pressure hydrocephalus is: 1) Perform neuroimaging (CT or MRI) of the head, 2) Conduct a large-volume lumbar puncture, 3) Reassess for transient clinical improvement, and 4) Place a ventriculoperitoneal (VP) shunt if the tap test is positive.
The standard management of normal pressure hydrocephalus (NPH) follows a strict logical sequence to balance diagnostic accuracy with patient safety. First, non-invasive neuroimaging (CT or MRI) is required to confirm ventriculomegaly and ensure there are no contraindications to a lumbar puncture, such as an intracranial mass. Second, because imaging findings of NPH can overlap with simple brain atrophy (hydrocephalus ex vacuo), a large-volume lumbar puncture (Miller Fisher tap test) must be performed. Third, the patient's gait and cognition are reassessed; temporary improvement confirms that the symptoms are driven by CSF dynamics rather than irreversible neurodegeneration. Finally, only patients who demonstrate a positive clinical response to the tap test are referred for neurosurgical placement of a ventriculoperitoneal (VP) shunt, which offers definitive, long-term CSF diversion.

Adım Adım Çözüm

1
Order non-contrast neuroimaging (CT or MRI).
Confirmation of enlarged ventricles without significant sulcal enlargement.
Rules out mass lesions, strokes, or obstructive hydrocephalus, establishing the structural criteria for NPH before any invasive testing is performed.
2
Perform a large-volume lumbar puncture.
Removal of 30-50 mL of cerebrospinal fluid.
Simulates the therapeutic effect of a surgical ventricular shunt to test if the patient's neurological symptoms are reversible.
3
Conduct a clinical reassessment.
Measurement of the patient's response to CSF drainage.
Identifies if the patient is a strong candidate for permanent surgical intervention; gait improvement is the most reliable predictor of surgical success.
4
Perform surgical shunting.
Placement of a ventriculoperitoneal (VP) shunt.
Provides definitive, continuous diversion of CSF to treat the underlying pathophysiology and maintain symptom relief.

Anahtar Kavram

The diagnostic and therapeutic algorithm for normal pressure hydrocephalus requires demonstrating structural ventriculomegaly on imaging followed by confirmed physiological responsiveness to CSF drainage prior to definitive neurosurgical shunting.
Bu soruyu puanla

Konular

Neurosurgery

Bu konudan daha fazla soru