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Biomedical subjects

N S Mercer

Publications and source records attributed to N S Mercer.

At least 19 recordsLinked to original sources

An aid to accurate planning of alar reconstruction in rhinoplasty.

Accurate placement of intranasal incisions to achieve external alar symmetry is difficult. A detailed anatomical knowledge of intranasal anatomy is required to allow an appropriate incision to be made within the nasal vestibule. By marking the level of the intracartilaginous incision on the external surface using a pair of alice forceps, the marking is subsequently transferred onto the vestibular nasal surface. The initial incision can therefore be made on the vestibular nasal surface along the marking made by the alice forceps.

Humans↗

Superiorly based flap pharyngoplasty: the degree of postoperative "tubing" and its effect on speech.

It is recognised that superiorly based pharyngeal flaps tend to contract resulting in narrowing and lowering of the flaps. If lateral pharyngeal-wall motion is unable to close against the "tubed" flap or if the flap migrates below the level of medial displacement of the lateral pharyngeal walls, velopharyngeal insufficiency will result. The extent of this phenomenon of flap contracture or shrinkage has not been previously quantified. A consecutive series of 120 superior flap pharyngoplasty operations were assessed critically and carefully. The mean width of the harvested flap measured 89% of the width of the pharyngeal posterior wall and shrank over 6 months to 45% of the lateral pharyngeal diameter. The relations between speech results, complication rate and remaining flap width are analysed. All flaps shrink but to a varying degree.

Adolescent↗

Prenatal diagnosis of cleft lip and palate.

A prospective study was conducted over a period of 8 years to compare the severity of the cleft lip and palate detected by ultrasound scanning of the foetus with the severity at birth. In the UK all pregnant women undergo a routine perabdominal ultrasound scan at 20 weeks' gestation. There were approximately 250000 scans performed in our catchment area during the study period. A total of 270 children were born with cleft lip and/or palate, of which 130 had cleft lip with or without cleft palate. Out of these, 23 were positively diagnosed by the ultrasound scan. The specificity was 100% and the sensitivity was 17.5%. Only two diagnoses led to termination of the pregnancy.

Cleft Lip↗

Modification of the Koken nasal splint.

Koken nasal splints have been found effective postoperatively in treating cleft-lip nose deformity. In our experience, their retention has been poor, so reducing the molding effect. This paper presents a modification designed to overcome the problem of retention.

Cleft Lip↗

Superior sternal cleft: construction with a titanium plate.

Sternal cleft is a rare congenital deformity, with a superior cleft being the most common. Although sternal clefting is known to be associated with vascular dysplasia, to our knowledge, we report the first case of superior sternal cleft with cervicofacial hemangiomata and cardiac defects in the absence of true ectopia cordis in a neonate. Early surgery in all cases of sternal clefting is advocated, preferably within the first 4 weeks of life. However, if the child is unfit for operation at this stage, repair should be carried out as soon as the child is stable and fit. The method of choice is primary approximation with the intraoperative precaution of confirming cardiorespiratory stability. We suggest reinforcing the primary approximation with a titanium plate to achieve rigid internal fixation and to reduce the tension at the approximation site. Because titanium osseointegrates well, this procedure results in a solid bony sternum.

Bone Plates↗

The arterial basis of pharyngeal flaps.

The arterial basis of pharyngeal flaps is unknown. Injection and dissection studies have been used in 41 adult human cadavers to study the arterial supply of pharyngoplasties in current use. Superiorly based posterior pharyngeal flaps are "random" in nature, inferiorly based posterior pharyngeal flaps may include an "axial" vessel, laterally based posterior pharyngeal flaps will include an "axial" vessel, and laterally based "sphincter" pharyngoplasties, although supplied segmentally, will contain an "axial" vessel if raised up to but not beyond the upper pole of the tonsil.

Adult↗

The arterial supply of the palate: implications for closure of cleft palates.

Little is known of the arterial anatomy of the palate. Injection studies and dissection of a total of 49 cadavers have shown the principal arterial supply of the soft palate to be the ascending pharyngeal artery, which anastomoses with the greater palatine artery at the junction of the hard and soft palates. The position and relations of the branches of the ascending palatine artery put it at risk during palate repair.

Aged↗

The silver nail.

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Bandages↗

Early diagnosis of staphylococcal toxaemia in burned children.

The features of toxic shock syndrome in burned children have been described in a review of seven patients (J. D. Frame et al., Burns 1985; 11, 234). These include a 'prodromal' 24-48 h period with diarrhoea, vomiting, general malaise, pyrexia, tachycardia and tachypnoea. The white cell count and haemoglobin concentration fall prior to the 'shock' phase, which occurs 3-4 days postburn. Once 'shock' has occurred the mortality of the condition is approximately 50 per cent; in the absence of 'shock' it is much reduced. We have undertaken a retrospective review of six burned children who were admitted in a 2-year period to the Mount Vernon NHS Trust Burns Unit with a clinical diagnosis of toxic shock syndrome. The evidence from our patients suggests that reliable early diagnostic signs are a rapidly developing severe pyrexia of 39.5 degrees C or above, and a simultaneously increasing tachycardia and tachypnoea to high levels. There is a sudden profound fall in the white cell count and haemoglobin concentration over a period of hours between 1 and 3 days from injury. Specific treatment should be instituted before the onset of 'shock'. The name staphylococcal toxaemia might promote earlier diagnosis and treatment of this condition and so reduce its mortality.

Bacterial Toxins↗

Tattoos.

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Adult↗

Focusable Doppler ultrasound in mapping dorsal hand flaps.

The dorsal arterial anatomy of 50 normal hands was mapped using high frequency pulsed wave Doppler ultrasound. The findings correlated with previous anatomical studies regarding the variability in the incidence of the arteries. Eight clinical cases were studied preoperatively, seven of whom underwent surgery involving local flaps. Intraoperatively the presence of the mapped vessels was confirmed in each case. This investigation defines the role of high frequency pulsed wave Doppler ultrasound in the mapping of dorsal hand flaps.

Adult↗

Silicone gel in the treatment of keloid scars.

Silicone gel is effective in the treatment of keloid scars. Eighteen patients with 22 scars were treated with gel and their progress reviewed at 6 months. Improvements in texture, colour and height of the lesions were noted.

Adolescent↗

With or without? A cooling study.

The cooling characteristics of a variety of hot-water receptacles have been tested to provide a guide to the temperatures involved in a scald.

Cooking and Eating Utensils↗