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Biomedical subjects

H C Wallace

Publications and source records attributed to H C Wallace.

4 recordsLinked to original sources
PubMed2004

Does ENT outpatient review at 1-week post ventilation tube insertion improve outcome at 1 month in paediatric patients?

The aims of this study were to see if ENT review at 1 week following ventilation tube insertion in paediatric patients reduced the complication rate and the number of consultations with the general practitioner in the first postoperative month. Sixty-six children were prospectively randomized into two follow-up groups: group A was reviewed at 1 week and 1 month and group B at 1 month only. There was no statistically significant difference in postoperative otorrhoea (P = 0.59), ventilation tube patency (P = 0.44), ventilation tube extrusion rate (P = 0.64) and number of consultations with the general practitioners (GP) for postoperative otorrhoea (P = 0.19) between the two groups at 1 month. In conclusion, there seems to be no advantage with early postventilation tube insertion review as it does not reduce complications or decrease the GP consultation rate.

Adolescent↗
PubMed2003

Endaural or postaural incision for myringoplasty: does it make a difference to the patient?

The aim of this study was to find out from patients who had undergone a myringoplasty via either an endaural or postaural approach whether or not they had experienced problems or symptoms relating to their scar, and if these differed depending on which incision had been used. A questionnaire was sent to 91 patients who had undergone myringoplasty between 18 and 62 months earlier. Thirty-four patients who had undergone previous or subsequent ear surgery were excluded. The only statistically significant difference found between groups having either a postauricular or endaural incision was in how likely others were to comment on their scar. There seem to be few long-term sequealae relating to the scar from myringoplasty. From a patient perspective, between 18 and 62 months postoperatively, there was very little difference in symptoms or problems whether or not an endaural or a postaural incision had been used for the surgery.

Adolescent↗
PubMed1997

Sonochemical reactions at 640 kHz using an efficient reactor. Oxidation of potassium iodide.

Ultrasound can be used to oxidize aqueous pollutants. However, due to economic reasons higher oxidation/destruction rates and higher energy efficiency are needed. Recent studies suggest that the higher ultrasound frequencies provide better oxidation rates than the conventional 20 kHz. Another area for improvement is reactor configuration. We have tested two new reactor configurations with proper focusing and reflection of ultrasound for maximum utilization. Reactor configuration plays an important role in the overall efficiency. In the new reactors, transducers and reaction mixture are separated by a polymer acoustic window which allows efficient transfer of ultrasound energy and not the heat from the transducer to the reaction mixture. One reactor at 640 kHz provides a 100% enhancement over the best reported rate for the oxidation of potassium iodide, on a per-Watt basis. Experiments conducted at varying initial KI concentrations show interesting behavior. Increasing the KI concentration by over eight fold merely increases the iodine production rate by two fold. This suggests that in the oxidation region surrounding the bubble, the KI concentration is much different than in the bulk. It is proposed that the hydrophobic bubble region has lower and near saturation KI concentration.

Journal Article↗