The relation of volume and outcome in trabeculectomy.

BACKGROUND/AIMS: Higher case volume has been associated with improved outcomes for a number of procedures. This study was designed to investigate whether this relationship existed for trabeculectomy. METHODS: The study was retrospective and conducted at an ophthalmic unit in the UK. All patients who had unenhanced trabeculectomy between 1996 and 2000 were identified. From their notes, the surgeon who performed the trabeculectomy was ascertained as were any unplanned interventions (eg conjunctival suturing, anterior chamber reformation, repeated attendances) within the first month of surgery. RESULTS: Two hundred and eleven trabeculectomies were performed over the study period. Twenty nine had unplanned interventions within the first postoperative month. Analysis of the data indicated that surgeons who performed less than eight operations per year had more complications than those who performed more than 10 per annum. This difference was only significant (chi(2)=4.0, P=0.045) when the data were aggregated. When separated per year, although not significant, the complication rate of the lower volume group was always higher than the group performing more than 10 per year. CONCLUSIONS: The results suggest that trabeculectomy can be added to the list of procedures in which larger case volume is associated with fewer early complications and potentially a better outcome. The findings, if replicated, tend to strengthen the argument for subspecialisation in glaucoma with its implications for training and revalidation.

Ambulatory instrumentation suitable for long-term monitoring of cattle health.

The benefits of real-time health diagnoses of cattle are potentially tremendous. Early detection of transmissible disease, whether from natural or terrorist events, could help to avoid huge financial losses in the agriculture industry while also improving meat quality. This work discusses physiological and behavioral parameters relevant to cattle state-of-health assessment. These parameters, along with a potentially harsh monitoring environment, drive a set of design considerations that must be addressed when building systems to acquire long-term, real-time measurements in the field. A prototype system is presented that supports the measurement of suitable physiologic parameters and begins to address the design constraints for continuous state-of-health determination in free-roaming cattle.

Appreciation of music in adult patients with cochlear implants: a patient questionnaire.

Many cochlear implant candidates express hopes of enjoying music following implantation. Our aim was to assess the appreciation of music after cochlear implantation in adult patients. Thirty-five out of 45 cochlear implantees (78%) from the North East Programme responded to a questionnaire. Only 16 out of 35 patients (46%) listened to music after implantation. Enjoyment of music on a self-assessment scale was graded a mean of 8.7/10 before deafness but only 2.6/10 after implantation. Listening to music after implantation was more likely in younger patients, those with higher speech perception scores and those with a shorter length of deafness, but was not found to be related to gender, type of implant, processing strategy, time since implant or music enjoyment before becoming deaf. Appreciation of music after cochlear implantation is disappointingly low. Future developments in implant technology should strive to improve satisfaction with music listening.

Effect of body incline on cardiac performance.

Maximal cardiac performance is improved in man during upright compared to supine exercise. Whether cardiac performance in quadrupeds is dependent upon body position is unknown. Therefore, we undertook the present investigation to determine if peak cardiac output (Qpeak) would be influenced by body inclination in the Thoroughbred horse. To test the hypothesis, four Thoroughbred horses performed an incremental exercise protocol (speed increased by 1 m/s/min to fatigue) on both a level (L) and inclined (I: 6 degrees) treadmill. Specifically, we hypothesised that Qpeak would be increased on the incline, as this represents a progression towards upright exercise. Cardiac output was determined using the Fick relationship from continuous measurements of pulmonary VO2 and paired arterial (carotid artery or transverse facial) and mixed venous (pulmonary artery) samples. Qpeak was significantly increased on the incline (L: 279 +/- 20; I: 336 +/- 17 l/min; P<0.05), while CaO2 was not significantly different (L: 25.5 +/- 1.1; I: 25.4 +/- 1.9 ml/100 ml), and therefore, whole body O2 delivery (QO2) was significantly increased (L: 70.7 +/- 4.9; I: 84.4 +/- 3.1 l/min; P<0.05). In conclusion, within the scope of this investigation, these data suggest that cardiac performance, as judged by increased Qpeak and QO2, is enhanced in the inclined body position. Furthermore, these findings provide preliminary information that level and incline treadmill exercise tests may yield significantly different results in the Thoroughbred horse and consequently this factor should be considered when interpreting exercise testing and performance data.

The use of ultrasound in the diagnosis of injuries of the ulnar collateral ligament of the thumb.

We describe the use of a specialist referral clinic and ultrasound assessment for all injuries to the ulnar collateral ligament of the metacarpophalangeal joint of the thumb presenting to an Accident and Emergency (A&E) department. Senior House Officers in the A&E department were able to correctly diagnose only 45% of the ruptures of the ulnar collateral ligament. The overall agreement between specialist clinic examination and ultrasound for injury to the ulnar collateral ligament was 85% (kappa 0.647). When compared with the operative finding ultrasound had a positive predictive value for rupture of 94%. An algorithm is presented for the assessment of injuries to the ulnar collateral ligament in A&E departments.

Primary and secondary iris cysts.

Primary cysts of the iris usually arise from the pigment epithelial layers and are almost always benign, stationary lesions which require no treatment. Those cysts which are secondary to such agents as trauma or inflammation are, however, characterized by progressive enlargement and visual complications. The major clinical significance of iris cysts lies in their similarity to iris melanomas. Cysts should be monitored for enlargement and/or other complications such as inflammation or secondary glaucoma.

Melanoma of the female urethra.

Our patient had a highly malignant and poorly differentiated tumor in the distal urethra. A conservative operation was performed because the precise nature of the tumor was not clear with light microscopy. An ultrastructural study established the final diagnosis of malignant urethral melanoma and anterior exenteration was performed. An aggressive operation should be considered as the primary approach once malignant melanoma is diagnosed. Ultrastructural studies should be introduced early in the diagnostic process when light microscopy is insufficient to provide a definitive diagnosis of urethral malignancy.

Winter sports-related urologic trauma.

There is no characteristic pattern of ski-related urologic injuries except those associated with major blunt abdominal trauma. Isolated urologic injuries and injuries of the lower urinary tract are relatively uncommon.

Crossed renal ectopia with familial occurrence.

A familial occurrence of crossed renal ectopia is presented. No genetic factor has been determined in this congenital anomaly so this familial occurrence is believed to be incidental.

Blue collection bag after ileal diversion.

Five children with ileal diversions have shown asymptomatic blue staining of the urine collection bags. A tryptophan derivative (indican) in the urine that oxidizes to indigo blue on exposure to air is thought to be the cause of this benign transient phenomenon.

Management of postoperative fistula of upper urinary tract.

The simple procedure of passage and withdrawal of a ureteral catheter hastens the closure of a urinary fistula after surgery of the ureter or renal pelvis.