Shock can be defined as?

Appeared in: PGIMS Rohtak NO - 2017

Explanation

Shock is fundamentally defined as a state of systemic tissue hypoperfusion, where blood flow is inadequate to meet the metabolic needs of cells.
This inadequate perfusion leads to a lack of oxygen and nutrient delivery, causing cellular injury and a shift from aerobic to anaerobic metabolism.
The consequence is lactic acidosis, cellular dysfunction, and if uncorrected, progression to multiple organ dysfunction syndrome (MODS) and death.
This definition focuses on the cellular level impact, which is the core of the pathophysiology, rather than just a single vital sign like blood pressure.

Option A: Hypotension (low blood pressure) is a common sign of shock, but it is not the definition. Shock can exist with a normal blood pressure in the early stages (compensated shock).
Option C: Hypoxemia is a condition of low oxygen levels in the arterial blood. While it can cause or result from shock, the definition of shock itself relates to inadequate blood flow and perfusion to the tissues.
Option D: This option is incorrect because only one of the choices, hypo-perfusion of tissue, correctly defines shock. The other options are signs or related conditions, not the fundamental definition.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition of Shock as background academic context rather than a clinical decision trigger.
Nurses must recognize shock early by assessing for signs of hypoperfusion (e.g., tachycardia, cool skin, altered mental status, decreased urine output), not just relying on blood pressure.
Early intervention, including fluid resuscitation and addressing the underlying cause, is critical to prevent progression from compensated to irreversible shock.
Monitoring serum lactate is a key nursing role, as rising levels are an early and sensitive indicator of tissue hypoperfusion and the severity of shock.

How to Approach the Question

This is a definition-based recall question that tests your understanding of a core medical concept.
First, analyze the question stem, which asks for the fundamental definition of 'shock'.
Evaluate each option to see which one describes the core pathophysiological process.
Recognize that 'hypotension' is a common sign, but not always present, especially in early shock.
Differentiate 'hypoxemia' (low blood oxygen) from 'hypoperfusion' (low blood flow). Shock is a perfusion problem.
Conclude that 'hypo-perfusion of tissue' is the most accurate and comprehensive definition that underlies all forms of shock.

Concept Tested & Keywords

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Practise the full PGIMS Rohtak NO - 2017

Attempt every question from this paper in a timed mock, then review the full solution for each one.