The amount of pressure created at the beginning of the ventouse application

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2022

Explanation

Ventouse delivery, or vacuum-assisted delivery, begins with a low initial negative pressure to safely draw the fetal scalp into the cup, forming a chignon (an artificial caput succedaneum).
The standard initial pressure applied is 0.2 kg/cm2, as confirmed by obstetric guidelines.
This pressure is then gradually increased in increments of 0.2 kg/cm2 every two minutes.
This gradual approach minimizes the risk of scalp trauma while ensuring a secure grip is established before applying traction.

Option B: This is an intermediate pressure level, not the initial pressure. It is typically reached after the first incremental increase from the starting pressure.
Option C: This is an intermediate pressure level, not the initial pressure. It is reached after several minutes of gradually increasing the vacuum.
Option D: This is the maximum recommended negative pressure for a ventouse delivery. It is never the starting pressure.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Initial pressure application in ventouse (vacuum-assisted) delivery as background academic context rather than a clinical decision trigger.
Correct pressure application is critical for both maternal and fetal safety during a ventouse delivery. The nurse plays a key role in monitoring the procedure.
Starting with a low pressure (0.2 kg/cm2) and increasing it gradually allows for the formation of an artificial caput (chignon), which is necessary for effective traction and reduces the risk of the cup 'popping off'.
Strict adherence to the maximum pressure limit (0.8 kg/cm2) is a key patient-safety measure to prevent serious neonatal complications like scalp lacerations, cephalohematomas, and subgaleal hemorrhage.

How to Approach the Question

This is a factual recall question testing knowledge of a specific clinical procedure.
Identify the keywords in the question stem: 'amount of pressure', 'beginning', and 'ventouse application'.
Recall the standard protocol for vacuum extraction. The procedure involves a gradual, stepwise increase in negative pressure to ensure safety.
The initial pressure must be the lowest value that is part of the standard protocol for initiating the procedure.
Evaluate the options: 0.2 kg/cm2 is the standard initial pressure. 0.4 kg/cm2 and 0.6 kg/cm2 are intermediate steps, and 0.8 kg/cm2 is the maximum limit.
Select the option that corresponds to the initial pressure applied at the start of the procedure.

Concept Tested & Keywords

Concept Tested: Initial pressure application in ventouse (vacuum-assisted) delivery.
Stem keywords: pressure, beginning, ventouse application
Lead-in keywords: amount of pressure

Qm8lzYNvlYF0AP2GjOJ5NG

E6 Obstetrics Williams p. 40-58

Practise the full RUHS, Jaipur, M.Sc Nursing Entrance Exam-2022

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