Which type of bladder is expected when a patient is experiencing spinal shock?

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2018

Medical & Surgical Nursing

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2018

Explanation

During spinal shock, all reflex activity below the level of the spinal cord injury is suppressed.
This includes the detrusor reflex (micturition reflex), which is responsible for bladder contraction and emptying.
The loss of this reflex results in a flaccid, non-contracting bladder known as an atonic bladder.
Clinically, this presents as urinary retention, where the bladder fills but cannot empty, leading to potential overflow dribbling when intravesical pressure exceeds urethral resistance.

Option A: A spastic (or reflex) bladder develops after spinal shock has resolved, typically in injuries above the T12 vertebra. It is characterized by hyperreflexia, not the areflexia of spinal shock.
Option B: Normal bladder function requires intact nerve pathways between the bladder, spinal cord, and brain, which are completely disrupted during spinal shock.
Option D: While technically the bladder is 'uncontrolled,' this term is imprecise and not the correct medical classification. It fails to describe the underlying pathophysiology.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Neurogenic bladder in spinal shock in acute care settings.
Recognizing an atonic bladder is critical for preventing bladder overdistension, which can cause permanent damage to the bladder muscle, vesicoureteral reflux, and subsequent kidney damage.
The primary nursing intervention is immediate bladder decompression via an indwelling or intermittent catheterization schedule to protect the urinary system and prevent infection.
What if? If the patient's injury was at the S2-S4 level (damaging the sacral micturition center), they would likely develop a permanent flaccid/atonic bladder even after spinal shock resolves, as the reflex arc itself is destroyed.

How to Approach the Question

First, identify the key clinical condition in the question: 'spinal shock'.
Recall the core pathophysiology of spinal shock: it is a state of temporary areflexia (loss of all reflexes) below the level of injury.
Apply this concept to the bladder. If all reflexes are lost, the bladder's emptying reflex (micturition reflex) must also be absent.
Evaluate the options based on this understanding. An absent reflex leads to a non-contracting, flaccid muscle. The correct medical term for this is 'atonic'.
Eliminate 'spastic' as this implies hyper-reflexia, which occurs after shock resolves. Eliminate 'normal' as function is clearly impaired. Eliminate 'uncontrolled' as it is too general and not a specific medical term.

Concept Tested & Keywords

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E6 Physiology Guyton 4SAE Part 2B p. 84-86

E6 Physiology Review Sembulingam 5e p. 73-75