Neonatal vigorous suctioning leads to?

NIMHANS Nursing Officer - 2019

Child Health Nursing (Pediatrics)

Medium

Appeared in: NIMHANS Nursing Officer - 2019

Explanation

Vigorous suctioning of a neonate's mouth and pharynx directly stimulates the vagus nerve.
Vagal nerve stimulation triggers a parasympathetic (vasovagal) reflex, which is a 'slowing down' response.
This reflex acts on the heart's pacemaker (sinoatrial node), causing a decrease in heart rate, which is known as reflex bradycardia.
In a neonate, a heart rate below 100 beats per minute is considered bradycardia and is a sign of distress.
This vagal response can also lead to other complications like apnea (temporary stop in breathing) or laryngospasm, which can worsen the bradycardia.

Option A: Reflex tachycardia is an increase in heart rate. This is a sympathetic ('fight or flight') response, often caused by stimuli like pain, fever, or hypovolemia. Vagal stimulation is parasympathetic and causes the opposite effect.
Option C: Reflex tachypnea is rapid breathing. While mild airway irritation might cause a cough or gasp, strong pharyngeal stimulation is more likely to cause apnea (cessation of breathing) or laryngospasm, not a sustained rapid respiratory rate.
Option D: Reflex bradypnea is an abnormally slow breathing rate. The more critical and classic respiratory response to overstimulation of the vagus nerve is apnea (complete cessation of breathing). Bradycardia is the primary cardiovascular response.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Complications of Neonatal Airway Management as background academic context rather than a clinical decision trigger.
Nurses must use gentle, brief, and appropriate pressure when suctioning neonates to prevent vagal stimulation and mucosal trauma.
Continuous monitoring of the neonate's heart rate via pulse oximetry or auscultation during and after suctioning is a critical patient safety measure.
Suctioning should be performed only when clinically indicated by obstructed breathing, not as a routine procedure for all newborns.

How to Approach the Question

First, identify the key terms in the question: 'Neonatal' and 'vigorous suctioning'.
Recall the relevant anatomy and physiology. Suctioning occurs in the oropharynx/nasopharynx, an area innervated by the vagus nerve.
Connect the action ('vigorous suctioning') to its physiological effect. Strong stimulation in this area triggers a vagal reflex.
Differentiate between the functions of the autonomic nervous system. The vagus nerve is part of the parasympathetic system, which slows down bodily functions.
Evaluate the options based on this knowledge. Parasympathetic stimulation slows the heart rate (bradycardia), making it the correct answer. Tachycardia is a sympathetic response and is therefore incorrect. The primary respiratory response to this reflex is apnea, not tachypnea or bradypnea.

Concept Tested & Keywords

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E6 Obstetrics Williams p. 81-95

E6 Text Book Of Pediatric Nursing 3rd Panchali Pal — Part 1 (pp 36-238 of 713) p. 164-166

E6 Anatomy Grays 43e Vol 1 Part 2 p. 98-100