Robin S. Howard

Corneal Biomechanics Following Epi-LASIK

PURPOSE To evaluate corneal biomechanical changes following epi-LASIK. METHODS In this prospective study of 51 patients, corneal hysteresis (CH), corneal resistance factor (CRF), and intraocular pressure (IOP) were assessed using the Ocular Response Analyzer (ORA, Reichert Technologies) preoperatively and at 1, 3, 6, and 12 months after epi-LASIK. Repeated measures analysis of variance (ANOVA) was used to compare changes over time (alpha=.05). Intraocular pressure was also measured by Goldmann applanation tonometry. RESULTS Corneal hysteresis decreased from 10.22±1.65 mmHg preoperatively to 8.17±1.25 mmHg at 1 month, 8.46±1.44 mmHg at 3 months, 8.63±1.31 mmHg at 6 months, and 8.53±1.49 mmHg at 12 months. Corneal resistance factor decreased from 10.01±1.80 mmHg preoperatively to 7.82±1.68, 8.03±1.85, 7.77±1.50, and 7.80±1.66 mmHg at 1, 3, 6, and 12 months, respectively. Repeated measures ANOVA showed a significant change over time for both CH and CRF (P<.0005). All measures of IOP changed significantly over time (P<.0005). CONCLUSIONS Epi-LASIK resulted in a significant change in CH and CRF postoperatively. Although some recovery occurred over time, CH, CRF, and IOP did not revert to preoperative levels.

A clinicopathologic study of vaginal intraepithelial neoplasia.

OBJECTIVE: To evaluate the natural history of vaginal intraepithelial neoplasia (VAIN) and to identify risk factors for invasive vaginal carcinoma. METHODS: The records of all women with VAIN diagnosed at military treatment facilities over a 10-year period with minimum follow-up of 12 months were reviewed. Patient demographics and clinical information related to the diagnosis and treatment of VAIN were recorded. RESULTS: One hundred twenty-seven women with VAIN met inclusion criteria. The mean age was 47.4 years, and median surveillance was 34 months (range 12–169 months). Seventy-five patients had low-grade vaginal dysplasia as their initial diagnosis, and 15 (20%) of these patients underwent treatment. Fifty-two patients had high-grade vaginal dysplasia, of which 38 (73%) underwent treatment. Overall, 113 patients (89%) demonstrated normalization of disease, 11 patients (9%) demonstrated persistence of disease, and three patients (2%) experienced recurrence of disease. No patients experienced development of invasive vaginal carcinoma. However, median time to normalization was 6 months longer in patients with low-grade dysplasia compared with those with high-grade dysplasia (15.9 months compared with 10.0 months; hazard ratio 1.5; 95% confidence interval 1.004–2.1; P=.045). Patients with high-grade dysplasia had more biopsies performed during their surveillance than patients with low-grade dysplasia (3.3 compared with 2.5; P=.045). CONCLUSION: Overall, 89% of patients demonstrated normalization of VAIN, and none had progression to invasive cancer. Normalization, persistence, and recurrence rates did not significantly differ by grade of dysplasia or treatment status. Based on our findings regarding the time to normalization, annual surveillance with combined cytology and colposcopy is likely adequate. Because 11% of patients with VAIN either will experience recurrence or will have persistent disease, lifetime surveillance is recommended. LEVEL OF EVIDENCE: III

Anterior segment measurements using digital photography: a simple technique.

Purpose. The purpose of this study is to describe a simple method of measuring anterior segment lesions from digital slit lamp images and confirm reliability of the technique. Methods. Ten reference photos were taken of a PD ruler, refocusing on the ruler for each photo. Using Adobe Photoshop, the number of pixels per millimeter squared (area) and 1 mm (linear) were recorded for each photo. An Excel spreadsheet was set up to convert pixels to millimeters and millimeters squared. Interrater reliability was determined by two observers who independently calculated the area of 69 epithelial defects. A Bland and Altman plot was used to demonstrate the agreement between the two doctors. Results. Interrater reliability was excellent as measured by an intraclass correlation coefficient (ICC 2,1) = 0.99. From the Bland and Altman plot it was determined that in 95% of cases, the area of the epithelial defect measured by provider 2 may be as much as 1.17 mm2 less than or 1.09 mm2 greater than that measured by provider 1. Conclusion. This simple method, which allows accurate measurements from digital images using common off-the-shelf software, is a valuable tool for clinical documentation as well as for research purposes.

Lymph Node Micrometastases in Early-Stage Cervical Cancer are Not Predictive of Survival

Although patients with early-stage cervical cancer have in general a favorable prognosis, 10% to 40% patients still recur depending on pathologic risk factors. The objective of this study was to evaluate if the presence of lymph node micrometastasis (LNmM) had an impact on patient’s survival. We performed a multi-institutional retrospective review on patients with early-stage cervical cancer, with histologically negative lymph nodes, treated with radical hysterectomy and pelvic lymphadenectomy for the study period 1994 to 2004. Tissue blocks of lymph nodes from the patient’s original surgery were recut and then evaluated for the presence of micrometastases. One hundred twenty-nine patients were identified who met inclusion criteria. LNmM were found in 26 patients (20%). In an average follow-up time of 70 mo, there were 11 recurrences (8.5%). Of the 11 recurrences, 2 (18%) patients had LNmM. Patients with LNmM were more likely to have received adjuvant radiation and chemotherapy. In stratified log-rank analysis, LNmM were not associated with any other high-risk clinical or pathologic variables. Survival data analysis did not demonstrate an association between the presence of LNmM and recurrence or overall survival. The presence of LNmM was not associated with an unfavorable prognosis nor was it associated with other high-risk clinical or pathologic variables predicting recurrence. Further study is warranted to understand the role of micrometastases in cervical cancer.

Effect of concussion and blast exposure on symptoms after military deployment

Objective: To examine whether blast exposure alone and blast-associated concussion result in similar neurologic and mental health symptoms. Methods: A 14-item questionnaire was administered to male US Marines on their return from deployment in Iraq and/or Afghanistan. Results: A total of 2,612 Marines (median age 22 years) completed the survey. Of those, 2,320 (88.9%) reported exposure to ≥1 blast during their current and/or prior deployments. In addition, 1,022 (39.1%) reported ≥1 concussion during the current deployment, and 731 (28.0%) had experienced at least 1 prior lifetime concussion. Marines were more likely to have sustained a concussion during the current deployment if they had a history of 1 (odds ratio [OR] 1.5, 95% confidence interval [CI] 1.2–2.0) or ≥1 (OR 2.3, 95% CI 1.7–3.0) prior concussion. The most common symptoms were trouble sleeping (38.4%), irritability (37.9%), tinnitus (33.8%), and headaches (33.3%). Compared to those experiencing blast exposure without injury, Marines either experiencing a concussion during the current deployment or being moved or injured by a blast had an increased risk of postinjury symptoms. Conclusions: There appears to be a continuum of increasing total symptoms from no exposure to blast exposure plus both current deployment concussion and past concussion. Concussion had a greater influence than blast exposure alone on the presence of postdeployment symptoms. A high blast injury score can be used to triage those exposed to explosive blasts for evaluation.

Infection and allergy incidence in ambulatory surgery patients using white petrolatum vs bacitracin ointment: A randomized controlled trial.

OBJECTIVE To assess the effect of white petrolatum vs bacitracin ointment on wound infection incidence, allergic contact dermatitis incidence, and healing characteristics. DESIGN Randomized, double-blind, prospective trial comparing white petrolatum with bacitracin ointment in postprocedure wound care. SETTING A general outpatient dermatology clinic and a tertiary referral advanced surgical procedure clinic at Walter Reed Army Medical Center, Washington, DC. PATIENTS A total of 922 patients who had dermatologic surgery with a total of 1249 wounds. MAIN OUTCOME MEASURES The incidence of infection and allergic contact dermatitis during a follow-up period of 4 weeks. Healing characteristics were secondary outcomes. RESULTS Of the 922 patients enrolled, 440 in the white petrolatum group and 444 in the bacitracin group were evaluable for clinical response. The 2 treatment groups had comparable baseline characteristics. Thirteen patients developed postprocedure infection (1.5%), 9 (2.0%) in the white petrolatum group vs 4 (0.9%) in the bacitracin group (95% confidence interval for difference, -0.4% to 2.7%; P=.37). Eight infections (1.8%) in the white petrolatum group were due to Staphylococcus aureus vs none in the bacitracin group (P=.004). No patient in the group using white petrolatum developed allergic contact dermatitis vs 4 patients (0.9%) in the group using bacitracin (P=.12). Additionally, there were no clinically significant differences in healing between the treatment groups on day 1 (P=.98), day 7 (P=.86), or day 28 (P=.28) after the procedure. CONCLUSIONS White petrolatum is a safe, effective wound care ointment for ambulatory surgery. In comparison with bacitracin, white petrolatum possesses an equally low infection rate and minimal risk for induction of allergy.