Cryotherapy PrecisionClinician's Estimate of Cryosurgical Iceball Lateral Spread of Freeze
Daron G. Ferris, MD;
Gregory R. Crawley, DVM;
Elizabeth G. Baxley, MD;
Robin Line, MD;
Keith Ellis, MD;
Peggy Wagner, PhD
Arch Fam Med. 1993;2(3):269-274.
Abstract
| |
Objective
To examine physicians' ability to estimate the lateral spread of freeze (LSF) of a cryosurgical iceball using three techniques.
Design
A nonrandomized control trial of in vitro nitrous oxide cryosurgical procedures.
Setting
Primary care residency training programs.
Participants
A convenience sample of 80 resident and faculty physicians from four family practice residency programs and one obstetrics and gynecology residency program.
Interventions
After performing cryosurgery with standard naked-eye and colposcopic-assisted techniques, subjects used a new experimental cryosurgical iceball gauge (CIG) to estimate the LSF during cryotherapy.
Main Outcome Measures
LSF estimations reported by physicians were compared simultaneously with those measured by an observer.
Results
The mean (±SD) LSF estimation errors at the termination of freeze were as follows: 2.6±2.42 mm for the colposcopy technique, 2.00±2.16 mm for the naked-eye method, and 1.28±0.87 mm for the CIG technique. The range of maximum error was 6.5 to 11 mm for the colposcopic technique, 5.5 to 12.5 mm for the naked-eye method, and 3.0 to 4.0 mm for the CIG technique.
Conclusions
Overestimation of the LSF, which increases the risk of undertreatment and residual disease, was more common than underestimation. The CIG minimized perceptual error and provided the best cryosurgical precision.
Author Affiliations
From the Medical Effectiveness Education and Research Program, Department of Family Medicine, Medical College of Georgia, Augusta (Drs Ferris, Crawley, and Wagner); Anderson (SC) Family Practice Center (Dr Baxley); Department of Family Medicine, Morehouse School of Medicine, Atlanta, Ga (Dr Line); and the Memorial Family Practice Residency Program, Savannah, Ga (Dr Ellis).
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES
Practice Commentary
Rodney
Arch Fam Med 1993;2:275-275.
ABSTRACT
|
