When assisting a dentist, an assistant may need to hold the high volume evacuation (HVE) attachment and use it to suction aerosols produced by the dentist's tools, particularly the high speed handpiece or the cavitron.
The assistant generally positions the HVE suction inlet lingual to the teeth being worked on, with the HVE shaft protruding laterally towards the side of the patient's face that is opposite the side where the teeth that the dentist is working on are located.
When the dentist is working on the lingual surfaces of the mandibular anteriors, the assistant generally positions the HVE suction tip facial and occlusal to the mandibular anterior teeth, and uses a flat surface to retract the lower anterior lip, while the HVE shaft protrudes extra-orally towards the patient's left lateral side.
To suction debris under the posterior aspect of the tongue in the lingual vestibule, the dentist can use a mouth mirror to lift up the tongue at the posterior aspect so as to squirt water under the tongue to float up debris for suctioning using the HVE suction tip.
Positioning the shaft so that it protrudes superiorly and anteriorly, versus just anteriorly in front of the patient's mouth, can also facilitate access of the HVE suction tip to the corner of the patient's mouth.
The bubble tower was calibrated to produce the correct suction in relation to the relative positions of the water-supply tube of the water reservoir and the soil surface of the lysimeter.
5 kPa suction was due to drainage through pores [is less than or equal to] 600 [micro]m diameter.
The infiltrometer was then replaced and set to 0 kPa water suction.
5 kPa suction whilst at 0 kPa it was only 2 weeks (Table 1).
The greater volume of cumulative drainage under 0 kPa suction was because of the extended leaching period required to produce a complete bromide BTC.
By identifying those assessment parameters that improve after NP suctioning, guidelines for deciding when to suction may be established.
Sixty percent (60%) of the physiotherapists surveyed reported that they suction when patients are unable to cough effectively or are retaining sputum.
In fact, Hough (1991), when describing the procedure for NP suctioning, states, "Nasopharyngeal suction is not indicated simply because secretions are present.
The authors of that study concluded that the decision to suction is very subjective among RNs.