Combat medic testing of a novel monitoring capability for early detection of hemorrhage.

BACKGROUND: Current out-of-hospital protocols to determine hemorrhagic shock in civilian trauma systems rely on standard vital signs with military guidelines relying on heart rate and strength of the radial pulse on palpation, all of which have proven to provide little forewarning for the need to implement early intervention prior to decompensation. We tested the hypothesis that addition of a real-time decision-assist machine-learning algorithm, the compensatory reserve measurement (CRM), used by combat medics could shorten the time required to identify the need for intervention in an unstable patient during a hemorrhage profile as compared with vital signs alone. METHODS: We randomized combat medics from the Army Medical Department Center and School Health Readiness Center of Excellence into three groups: group 1 viewed a display of no simulated hemorrhage and unchanging vital signs as a control (n = 24), group 2 viewed a display of simulated hemorrhage and changing vital signs alone (hemorrhage; n = 31), and group 3 viewed a display of changing vital signs with the addition of the CRM (hemorrhage + CRM; n = 22). Participants were asked to push a computer key when they believed the patient was becoming unstable and needed medical intervention. RESULTS: The average time of 11.0 minutes (95% confidence interval, 8.7-13.3 minutes) required by the hemorrhage + CRM group to identify an unstable patient (i.e., stop the video sequence) was less by more than 40% (p < 0.01) compared with 18.9 minutes (95% confidence interval, 17.2-20.5 minutes) in the hemorrhage group. CONCLUSION: The use of a machine-learning monitoring technology designed to measure the capacity to compensate for central blood volume loss resulted in reduced time required by combat medics to identify impending hemodynamic instability. LEVEL OF EVIDENCE: Diagnostic, level IV.

Laparoscopic colpotomy using monopolar electrocautery: does power really matter?

OBJECTIVE: The purpose of this study was to assess the extent and rate of vaginal tissue injury associated with the utilization of various monopolar electrosurgical power settings when laparoscopically transecting vaginal tissue. METHODS: This is an Institutional Animal Care and Use Committee-approved prospective, paired, single-blinded study. Externalized porcine vagina was transected using monopolar energy at 30, 50, and 80 W in the cut mode with laparoscopic Endo Shears. The slides were prepared and stained with both hematoxylin-eosin and Masson trichrome and were examined by board-certified veterinary pathologists blinded to the study. RESULTS: There were 18 swine; each animal was tested on all 3 power settings (n = 54). Tissue injury was measured to a mean (SD) of 767 (519) µm at 30 W, 690 (600) µm at 50 W, and 556 (470) µm at 80 W. When comparing the monopolar settings, the results were as follows: 30 versus 50 W (P = 0.33), 30 versus 80 W (P = 0.067), and 50 versus 80 W (P = 0.17). The mean (SD) time for complete transection was measured at each power setting (n = 18), with 35.8 (5.4) seconds for 30 W, 13.5 (5.5) seconds for 50 W, and 8.4 (5.1) seconds for 80 W (P < 0.001). There was a statistically significant difference in the mean (SD) rates of injury, with 20.8 (8.8) µm/s at 30 W, 39.8 (11.8) µm/s at 50 W, and 50.1 (19.2) µm/s at 80 W (P = 0.01). CONCLUSIONS: Using various power settings of monopolar energy may not make a significant difference in swine vaginal tissue damage at the time of colpotomy. However, there was a significant difference in the times and rates at which tissue was transected when using higher powers. We recommend using the 50- or 80-W setting, as this will likely decrease surgical times without altering vaginal tissue damage.

Comparison of two simulation systems to support robotic-assisted surgical training: a pilot study (Swine model).

OBJECTIVE: To compare the efficacy of simulation-based training between the Mimic dV- Trainer and traditional dry lab da Vinci robot training. DESIGN: A prospective randomized study analyzing the performance of 20 robotics-naive participants. Participants were enrolled in an online da Vinci Intuitive Surgical didactic training module, followed by training in use of the da Vinci standard surgical robot. Spatial ability tests were performed as well. Participants were randomly assigned to 1 of 2 training conditions: performance of 3 Fundamentals of Laparoscopic Surgery dry lab tasks using the da Vinci or performance of 4 dV-Trainer tasks. Participants in both groups performed all tasks to empirically establish proficiency criterion. Participants then performed the transfer task, a cystotomy closure using the daVinci robot on a live animal (swine) model. The performance of robotic tasks was blindly assessed by a panel of experienced surgeons using objective tracking data and using the validated Global Evaluative Assessment of Robotic Surgery (GEARS), a structured assessment tool. RESULTS: No statistically significant difference in surgeon performance was found between the 2 training conditions, dV-Trainer and da Vinci robot. Analysis of a 95% confidence interval for the difference in means (-0.803 to 0.543) indicated that the 2 methods are unlikely to differ to an extent that would be clinically meaningful. CONCLUSION: Based on the results of this study, a curriculum on the dV- Trainer was shown to be comparable to traditional da Vinci robot training. Therefore, we have identified that training on a virtual reality system may be an alternative to live animal training for future robotic surgeons.

Magnification effects on distance estimation during robotic suturing.

We aimed to understand the impact of magnification on distance estimation during robotic suturing. Twenty subjects estimated the lengths of various sutures externally, in plain sight, to validate their ability to measure distances. They then robotically repaired a 3-cm cystotomy, suturing 10 mm above and below the incision and 10 mm on either side of the incision. The bladder was removed and distances measured. A total of 20 surgeons were analyzed: 7 residents, 8 fellows, and 5 staff. Specialties comprised four urologists, eight general gynecologists, two urogynecologists, three gynecologic oncologists, and three reproductive endocrinologists. The mean estimation for external suture length was not significant at 10 mm: mean = 9.6 (±3.2) mm (p = 0.59). When comparing these data sets, the externally visualized 10-mm suture versus the suture-to-suture and the suture-to-incision distances were both significantly different (p = 0.002 and p < 0.001, respectively). The mean distance between each suture was 6.5 (±1.8) mm, which was significantly different from the 10-mm goal (p < 0.001, 95 % confidence interval (CI) [-4.4,-2.6]). The mean distance from the suture to the incision was 4.1 (±1.0) mm, which was also statistically significantly different from the goal (p < 0.001, 95 % CI [-6.3,-5.4]). Surgical experience was negatively associated with suture-to-incision distance (r s = -0.53, p = 0.016). Inter-suture distance was also negatively associated with experience (r s = -0.30, p = 0.22), though not statistically significant. In vivo distances are significantly underestimated during robotic suture placement. Interestingly, the most experienced surgeons had the worst distance estimation from the incision to the suture.

Usability study of a novel, self-lighted, disposable speculum: military applications.

STUDY DESIGN: Data collected from a postutilization questionnaire were used to evaluate the usability of the OfficeSPEC disposable vaginal speculum, specifically the effectiveness, efficiency, and acceptability, in clinical, hospital, and austere environments. RESULTS: Usability data analysis showed the OfficeSPEC speculum had an effectiveness rating of 4.6/5, efficiency rating of 4.5/5, and acceptability rating of 4.6/5; overall usability in deployed environments was favorable. The overall rankings were 3.4 for plastic, 4.2 for metal (p < 0.001), and 4.5 for OfficeSPEC (p < 0.001). Cost analysis of the OfficeSPEC placed the disposable speculum as a reasonable alternative with yearly cost of $129,200, compared to traditional metal ($209,100) and plastic ($319,175). CONCLUSION: By evaluating the OfficeSPEC speculum within a usability framework, it proved to be practical, viable alternative in all environments, particularly in the forward deployed environment.

The C.L.E.A.R. Score: a new comprehensive assessment method for academic physicians in military medical centers.

INTRODUCTION: Evaluation of medical officer performance is a critical leadership role. OBJECTIVES: This study offers a comprehensive evaluation system for military physicians. METHODS: The Comprehensive Assessment equation (COMPASS equation), a modified Cobb-Douglas equation, was developed to evaluate academic physicians. The COMPASS equation assesses military physicians within five comprehensive dimensions: (1) Clinical (2) Leadership, (3) Educational (4) Administrative, and (5) Research productivity excellence to yield a composite "C.L.E.A.R. Score." RESULTS: The COMPASS equation's fidelity was tested with a cohort of military physicians within the department of Obstetrics and Gynecology in the Capital District Region and a C.L.E.A.R. score was calculated for individual physicians. Mean C.L.E.A.R score was 53.6 +/- 28.8 (range 10.1-98.5). The responsiveness of the model was tested using two hypothetical physician models: "low-performing-faculty" and "super-faculty," and calculated C.L.E.A.R. scores were 6.3 and 153.4, respectively. CONCLUSIONS: The C.L.E.A.R. score appears to recognize and assess the performance excellence of military physicians. Weighting measured characteristics of the COMPASS equation can be used to promote organizational priorities. Thus, leaders of military medicine can communicate institutional priorities and inculcate them through use of the COMPASS equation to reward and recognize the activities of military medical officers that are commensurate with institutional goals.

Laparoscopic hysterectomy using various energy sources in swine: a histopathologic assessment.

OBJECTIVE: Analyze energy-induced damage to the swine vagina during laparoscopic hysterectomy. STUDY DESIGN: Laparoscopic colpotomy was performed in swine using ultrasonic, monopolar, and bipolar energy. Specimens (n = 22) from 13 swine were stained with hematoxylin and eosin and Masson's trichrome for energy-related damage. The distal scalpel-cut margin was used as reference. Energy induced damage was assessed by gynecologic and veterinary pathologists blinded to energy source. RESULTS: Injury was most apparent on Masson's trichrome, demonstrating clear injury demarcation, allowing consistent, quantitative damage measurements. Mean injury was 0 ± 0 µM (scalpel, n = 22), 782 ± 359 µM (ultrasonic, n = 7), 2016 ± 1423 µM (monopolar, n = 8), and 3011 ± 1239 µM (bipolar, n = 7). Using scalpel as the reference, all were significant (P < .001). CONCLUSION: All energy sources demonstrated tissue damage, with ultrasonic showing the least and bipolar the greatest. Further study of tissue damage relative to cuff closure at laparoscopic hysterectomy is warranted.

Anatomical and histological examination of the porcine vagina and supportive structures: in search of an ideal model for pelvic floor disorder evaluation and management.

OBJECTIVE: : The objective of the study was to examine the anatomy and histology of the swine vagina and adjacent supportive structures in comparison to human tissues to determine the potential utility of this model for pelvic floor disorder evaluation and management. METHODS: : This is a descriptive study of the gross anatomy and histology of the swine vagina, uterosacral ligament, cardinal ligament, and rectovaginal space. Tissue was collected from 6 different sites in each of the 6 animals, processed, and stained with hematoxylin-eosin, Masson trichrome, and van Gieson and evaluated by both gynecologic and veterinary pathologists. RESULTS: : Porcine tissues were similar to the human vagina and supporting structures. The origin, insertion, and course of the uterosacral and cardinal ligaments appeared similar to those in humans. Histologically, both the porcine and human vagina and rectum consist of a mucosal, muscular, and adventitial layers. The swine vaginal smooth muscle is arranged in an inner circular and outer longitudinal manner. Collagen, elastin, and smooth muscle were identified in 5 sites. Collagen was highest in the cardinal compared with the uterosacral ligament (P = 0.03), whereas elastin was highest in the uterosacral ligament. The vaginal epithelium measured approximately 40 µm at the vaginal cuff and 50 to 200 µm at anterior and posterior vagina. The swine vagina appeared thinner and contained less elastin. The rectovaginal region contained a smooth muscle layer leading to a thin adventitial layer. CONCLUSIONS: : The swine vagina and adjacent supportive structures appear to be grossly and histologically similar to human vaginal anatomy, and these similarities could lead to further investigation of the porcine model in the study of pelvic support and support disorders.

Utility of ultrasound in the combat theater: experiences of a gynecologist during Operation Iraqi Freedom/Operation Enduring Freedom.

OBJECTIVE: The purpose of this study was to evaluate the utility of ultrasound in a combat theater. METHODS: A retrospective review of gynecology visits was evaluated at Camp Doha, Kuwait, from August 2003 through April 2004. Of the 1,737 visits, 237 required pelvic ultrasound. Demographic information, as well as the indications, diagnosis, and disposition of the patients, was compiled. RESULTS: The average age of the patient requiring ultrasound was 28 +/- 8 years. The primary presenting complaint was pelvic pain. Forty percent with pelvic pain had no identifiable cause. The most common final diagnosis was pregnancy. Of the 237 visits, the use of ultrasound resulted in 136 return-to-duty dispositions. Of the 31% who were administratively redeployed, the majority were secondary to pregnancy. CONCLUSION: Gynecologic ultrasound was found to be a very useful tool in the combat theater. Ultrasound resulted in improved diagnostic ability and enhanced reassurance to both provider and patient.

Pregnancy during Operation Iraqi Freedom/Operation Enduring Freedom.

OBJECTIVE: The purpose of this study was to evaluate pregnancy during war-time deployment. METHODS: A retrospective review of gynecology visits was evaluated at Camp Doha, Kuwait, from August 2003 through April 2004. Of the 1,737 visits, 77 demonstrated a positive pregnancy test. These charts were evaluated for factors that may lead to important information for future deployments. RESULTS: The average age of the female soldier with a positive pregnancy test in theater was 27 +/- 7 years. The primary presenting complaint was amenorrhea. Ninety-two percent had an ultrasound. Fifty-four percent of visits were active duty, followed by Reserve, National Guard, and civilian government employees. Ninety-two percent were administratively redeployed. Seventy-seven percent of the soldiers became pregnant in country. Twenty-three percent arrived in country pregnant. CONCLUSIONS: Given the number of pregnancies before and during deployment, current screening procedures as well as new concepts in prevention need to be addressed.

Sexually transmitted diseases in Operation Iraqi Freedom/Operation Enduring Freedom.

OBJECTIVE: To identify the incidence of sexually transmitted diseases (STDs) in a female active duty population deployed in support of Operation Iraqi Freedom/Operation Enduring Freedom was the objective of this study. METHODS: Retrospective chart review was completed on all soldiers seeking outpatient gynecologic care at Camp Doha, Kuwait, from September 2003 through March 2004. Descriptive statistical analysis was performed on data from all patients identified as having an STD. RESULTS: Forty-four soldiers (2.5% of all encounters) were diagnosed with STDs during the study period. Genital herpes, Condyloma acuminata, and chlamydia were the most commonly identified infections accounting for 30, 25, and 21% of the diagnoses, respectively. CONCLUSION: Transmission of STDs in the deployed environment continues to be problematic. Viral infections were more commonly encountered than were bacterial infections. Patient education and prevention should be emphasized. Consideration should be given to STD screening upon redeployment.

Pelvic pain presenting in a combat environment.

OBJECTIVE: The objective was to identify the incidence of pain disorders in the deployed female active duty population in support of Operation Iraqi Freedom. METHODS: Retrospective chart review was completed on all patients who were seen for gynecologic services at Camp Doha, Kuwait, from September 2003 through March 2004. One thousand seven hundred thirty-seven patients were identified. Statistical analysis was performed. RESULTS: Of the 1,737 patients seen during the study period, 150 patients were identified as having a pelvic pain disorder. These patients accounted for 14% of all patients seen for gynecologic services. Mean age was 28 +/- 8 years (range, 15-53 years). Pelvic pain of unclear etiology and cystitis were the most common diagnoses made accounting for 19% and 16% of encounters. CONCLUSIONS: Acute pelvic pain disorders can be effectively managed in the combat environment. Optimization of predeployment regimens for management of pain is strongly recommended. Consideration should be given to making soldiers with chronic pelvic pain disorders that fail to respond to predeployment medical management nondeployable.

Chronic urinary retention and pelvic floor hypertonicity after surgery for endometriosis: a case series.

OBJECTIVE: The purpose of this study was to evaluate 4 cases of chronic urinary retention and pelvic floor muscle spasms after surgery for endometriosis. STUDY DESIGN: These patients underwent a complete history, physical exam, and diagnostic work- up. The results were analyzed with regards to type and extent of inciting surgery, diagnostic findings, postoperative recovery, and treatment success. RESULTS: The patients' mean age was 39.5 years and all had undergone various surgical interventions for endometriosis. In addition to urinary retention, all developed debilitating pelvic floor muscle spasm postoperatively. Physical exam revealed pelvic floor hypertonicity and urodynamics indicated hypoactive detrusor contractility. Neurodiagnostic testing gave evidence of neuropathy in all subjects. CONCLUSION: Extensive endometriosis surgery may pose a risk for postoperative bladder dysfunction and pelvic floor muscle spasm.

Acute dysuria among female soldiers.

OBJECTIVE: To assess behavior patterns among active duty female soldiers presenting to military care facilities for acute dysuria. METHODS: A self-administered questionnaire was developed. One hundred twelve female soldiers presenting with acute dysuria and one hundred twenty-six presenting for other reasons were surveyed. RESULTS: During regular duty hours, the dysuria group drank less than the control group (21% and 14%, respectively; p = 0.004). However, field duty appeared to compound this problem, with the dysuria group drinking considerably less than the control group (79% and 19%, respectively; p = 0.002). Both groups stated that they postponed urination during working hours. The dysuria group postponed urination more than did the control group during regular duty (75% and 53%, respectively; p = 0.006) and field duty (79% and 65%, respectively; p = 0.008). CONCLUSIONS: Female soldiers presenting with dysuria were more likely to report fluid restriction and to postpone voiding during duty, behaviors that were reported even more frequently during field duty. Fluid restriction and postponed urination may be significant factors in the development of acute dysuria among female soldiers.

Arcus tendineus fascia pelvis: a further understanding.

OBJECTIVE: The study was undertaken to further define the anatomy of the arcus tendineus fascia pelvis (ATFP). STUDY DESIGN: Thirty cadavers were dissected to find the average length, SD, and range of the ATFP. Comparisons were made to height and pelvis type. The average distance between the ischial spine and the attachment of the fascia of the rectovaginal septum (RVF) to the ATFP was measured. RESULTS: The average length, SD, and range in centimeters for the ATFP are 9.0, 0.70, and 7 to 10.5, respectively. The length of the ATFP increased with height. No associations could be made regarding pelvis type. The average distance between the ischial spine and the attachment of the RVF to the ATFP is 2.15 cm with a SD and range of 0.21 and 1.75 to 2.5, respectively. CONCLUSION: In this study, an average length for the ATFP is established and the distance between the ischial spine and the attachment of the RVF to the ATFP is redefined.

Perineal descent and levator ani hernia: a dynamic magnetic resonance imaging study.

PURPOSE: Patients with symptomatic pelvic organ prolapse often have multifocal pelvic floor defects that are not always evident of physical examination. In this study, dynamic magnetic resonance imaging of symptomatic patients with pelvic floor prolapse demonstrated unsuspected levator ani hernia. This study was designed to identify any specific symptoms and/or physical findings associated with these hernias. METHODS: Eighty consecutive patients with pelvic organ prolapse, fecal and/or urinary incontinence, or chronic constipation received standardized questionnaires, physical examination, and dynamic magnetic resonance imaging. Fisher's exact test was used to compare symptoms and examination findings between patients with or without levator ani hernia. RESULTS: Twelve patients (15 percent) were found to have unilateral (n = 8) or bilateral (n = 4) levator ani hernias on dynamic magnetic resonance imaging. No one specific symptom was directly associated with the presence of a levator ani hernia. Furthermore, levator ani hernias were not found more frequently in patients with previous pelvic floor surgery. Perineal descent on physical examination was associated with the finding of a levator ani hernia in nine patients (P = 0.02). Although not statistically significant, there was a trend toward a lower incidence of levator ani hernia in females using estrogen replacement therapy (P = 0.06). CONCLUSIONS: Patients with symptomatic pelvic organ prolapse and perineal descent on physical examination may have a levator ani hernia. Although the significance of levator ani hernia needs to be determined, the recurrence rate after the surgical management of pelvic organ prolapse remains unacceptably high, and ongoing investigation of all associated abnormalities is warranted.