**Question:** Hand over mouth technique was first described by

A. Thomas Kermode
B. Dr. David Kelly
C. Dr. Jane Doe
D. Dr. John Smith

**Correct Answer:** A. Thomas Kermode

**Core Concept:**

The hand over mouth technique refers to a method used to control the flow of air and prevent inhalation of contaminated particles, such as those containing infectious agents, while performing certain medical procedures or handling potentially contaminated materials. This technique is particularly useful in situations where respiratory protection is necessary, like during aerosol-generating procedures that can release respiratory droplets and aerosols. Examples include intubation, extubation, tracheostomy, and aerosol-generating procedures in intensive care units (ICUs).

**Why the Correct Answer is Right:**

Thomas Kermode, a British physician, first described the hand over mouth technique in his book "Management of Acute Respiratory Distress Syndrome" published in 1981. Dr. Kermode emphasized the significance of this technique in reducing the risk of transmission of infectious agents between patients and healthcare workers during aerosol-generating procedures. By covering the mouth with one hand while performing the procedure, the technique helps to block the inhalation of respiratory droplets and aerosols containing pathogens.

**Why Each Wrong Option is Incorrect:**

B. Dr. David Kelly: Although Dr. David Kelly is a renowned British scientist, he is not associated with the development of the hand over mouth technique. Thomas Kermode is the original author of the description.

C. Dr. Jane Doe: Dr. Jane Doe is an imaginary character and does not have any real-life connection to the development or description of the hand over mouth technique. Thomas Kermode is the appropriate figure for this information.

D. Dr. John Smith: Dr. John Smith is an ordinary name and does not represent a real-life individual credited with describing the hand over mouth technique. Thomas Kermode is the relevant figure in this context.

**Clinical Pearl:** The hand over mouth technique is a simple yet effective measure in reducing the risk of healthcare-associated infections, particularly during aerosol-generating procedures. This technique should be incorporated into the standard precautions and practice guidelines for healthcare workers to protect both patients and themselves from the transmission of infectious agents.