Before and During the First COVID-19 Surge: Work Conditions, Burnout, and Mental Health Among Resident Physicians in a Department of Psychiatry in the USA.

OBJECTIVE: Resident physicians are critical frontline workers during pandemics, and little is known about their health. The study examined occupational and mental health risks among US psychiatry residents before and during the first COVID-19 surge. METHODS: Longitudinal data were collected from a cohort of US psychiatry residents at one academic medical center in October 2019, before the pandemic, and April 2020 after the initiation of a state-level stay-at-home order. Primary outcome measures were psychological work empowerment, defined as one's self-efficacy towards their work role, and occupational burnout. A secondary outcome was mental health. In May and June 2020, resident engagement sessions were conducted to disseminate study findings and consider their implications. RESULTS: Fifty-seven out of 59 eligible residents participated in the study (97%). Half the study sample reported high burnout. From before to during the first COVID-19 surge, psychological work empowerment increased in the total sample (p = 0.03); and mental health worsened among junior residents (p = 0.004), not senior residents (p = 0.12). High emotional exhaustion and depersonalization were associated with worse mental health (p < 0.001). In engagement sessions, themes related to residents' work conditions, COVID-19, and racism emerged as potential explanations for survey findings. CONCLUSIONS: The study is exploratory and novel. During early COVID, psychiatry residents' well-being was impacted by occupational and societal factors. Postpandemic, there is a growing psychiatrist shortage and high demand for mental health services. The findings highlight the potential importance of physician wellness interventions focused on early career psychiatrists who were first responders during COVID.

We're Not Sure We Like It but We Still Want More: Trainee and Faculty Perceptions of Remote Learning During the COVID-19 Pandemic.

OBJECTIVE: In this study, the authors aim to compare perceptions of remote learning versus in-person learning among faculty and trainees at a single institution during the COVID-19 pandemic and to evaluate the impact that a brief faculty training on best practices in online teaching would have on faculty attitudes towards remote learning. METHODS: The authors conducted an attitude survey on remote learning among trainees and faculty members approximately 3 months after the transition from in-person to remote learning. The authors then conducted a faculty training on best practices in online teaching followed by an evaluation survey. Study findings were examined descriptively and by Fisher's exact testing. RESULTS: The response rates for the attitudes survey were 68% among trainees and 61% among faculty. Trainees and faculty perceived in-person learning more favorably than remote learning across a variety of domains, including overall enjoyment, interpersonal connection, ability to communicate, and concentration. Despite these trends, only 10% of trainees and 14% of faculty felt that all lectures would be most effectively delivered in-person when this becomes possible again. The response rate for the faculty training evaluation survey was 16%. Compared to non-attendees, faculty attendees reported more confidence in their ability to teach remotely (89% vs 56%, p=0.02) but not increased optimism (89% vs 63%, p=0.06). CONCLUSIONS: The study findings suggest that both trainees and faculty perceive remote learning negatively compared to in-person learning but still feel that some lectures should be delivered remotely even after a return to in-person learning is possible.

A Medical Incapacity Hold Policy Reduces Inappropriate Use of Involuntary Psychiatric Holds While Protecting Patients From Harm.

BACKGROUND: The use of involuntary psychiatric holds (IPH) to detain patients who lack the capacity to make health care decisions due to nonpsychiatric conditions is common. While this practice prevents patient harm, it also deprives civil liberties, risks liability for false imprisonment, and may hinder disposition. Medical incapacity hold (MIH) policies, which establish institutional criteria and processes for detaining patients who lack capacity but do not meet criteria for an IPH, provide a potential solution. METHODS: A retrospective chart review was conducted on adult medical/surgical inpatients placed on an IPH or MIH over the 1-year periods before and after implementation of a MIH policy at an academic medical center. The primary outcome was frequency of IPH utilization in patients who did not qualify for an IPH as determined by 2 independent physician reviewers. A Cohen's kappa was calculated to determine inter-rater reliability. Differences in patient demographics and outcomes were compared using a Student's t-test, Wilcoxon rank-sum test, and Pearson chi-square test (α = 0.05). RESULTS: The Cohen's kappa was 0.72 indicating substantial agreement. Seventy MIHs were placed after implementation (mean duration 4.3 days). Before MIH implementation, 17.6% of IPHs were placed on non-qualifying patients, which decreased to 3.9% following MIH implementation (p < 0.01). The average length of stay for patients on an IPH or MIH did not change following MIH implementation. No instances of patient elopement, grievances, or litigation were found. CONCLUSION: MIH policies benefit both patients lacking capacity and the health care systems seeking to protect them while avoiding inappropriate use of IPHs.

The Medical Incapacity Hold: A Policy on the Involuntary Medical Hospitalization of Patients Who Lack Decisional Capacity.

BACKGROUND: Medically hospitalized patients who lack decisional capacity may request, demand, or attempt to leave the hospital despite grave risk to themselves. The treating physician in this scenario must determine how to safeguard such patients, including whether to attempt to keep them in the hospital. However, in many jurisdictions, there are no laws that address this matter directly. In this absence, psychiatrists are often called upon to issue an involuntary psychiatric hold (civil commitment) to keep the patient from leaving. Yet, civil commitment statutes were not intended for, and generally do not address, the needs of the medically ill patient without psychiatric illness. Civil commitment is permitted for patients who pose a danger to themselves or others, or who are gravely disabled, specifically as the result of a mental illness, and allows the transport of such individuals to facilities for psychiatric evaluation. It does not permit detention for medical illnesses nor the involuntary administration of medical treatments. Therefore, the establishment of hospital policies and procedures may be the most appropriate means of detaining medically hospitalized patients who lack capacity to understand the risks of leaving the hospital, in addition to mitigating the potential tort risk faced by the physician for acting in a manner that protects the patient. OBJECTIVE: The purpose of this article is to identify the array of clinical and medical-legal concerns in these scenarios, and to describe the development of a "medical incapacity hold" policy as a means of addressing this unresolved issue.

Hybrid transureteral nephrectomy in a survival porcine model.

BACKGROUND AND OBJECTIVES: Natural-orifice approaches for nephrectomy have included access via the stomach, vagina, bladder, and rectum. Recently, the feasibility of using the ureter as a natural orifice for natural-orifice transluminal endoscopic surgery nephrectomy has been demonstrated in a nonsurvival porcine model. The purpose of this study was to assess the outcomes of transureteral laparoscopic natural-orifice transluminal endoscopic surgery nephrectomy in a survival porcine model. METHODS: Three pigs underwent hybrid transureteral natural-orifice transluminal endoscopic surgery nephrectomy. An experimental balloon/dilating sheath was inserted over a wire to dilate the urethra, ureteral orifice, and ureter. Through a bariatric 12-mm laparoscopic port, the ureter was opened medially and the hilar dissection was performed. Next, 2 needlescopic ports were placed transabdominally to facilitate hilar transection. The kidney was morcellated using a bipolar sealing device and extracted via the ureter using the housing of a bariatric stapling device. The ureteral orifice was closed with a laparoscopic suturing device. The bladder was drained by a catheter for 10 to 14 days postoperatively. Pigs were euthanized on postoperative day 21. RESULTS: All surgical procedures were successfully completed, with no intraoperative complications. One pig had an episode of postoperative clot retention that resolved with catheter irrigation. Each pig was healthy and eating a normal diet prior to euthanasia. CONCLUSIONS: This study demonstrates the feasibility of a hybrid transureteral approach to nephrectomy in a survival porcine model. This technique avoids the intentional violation of a second organ system and the risk for peritoneal contamination. Improved instrumentation is needed prior to implementation in the human population.

Comparing stone attenuation in low- and conventional-dose noncontrast computed tomography.

BACKGROUND AND PURPOSE: Noncontrast computed tomography (NCCT) has high sensitivity, specificity, and is able to predict stone composition using Hounsfield units (HU) but is associated with high radiation exposure. In an attempt to reduce radiation exposure, low-dose stone protocols have been developed that provide excellent detection of stones. It is not known, however, whether these protocols are equally effective in determining HU stone density. The purpose of this study is to compare stone HU attenuation between low- and conventional-dose NCCT. MATERIALS AND METHODS: In this prospective randomized, single blinded study, 7-mm calcium oxalate stones were placed randomly into nine intact urinary systems and scanned in three different cadaveric vehicles. Holding other parameters constant, NCCT was performed at varying mAs levels ranging from 5 to 140. Identical magnified images at each mAs setting were reviewed in a blinded fashion to determine HU attenuation. Statistical analyses were performed using a Kruskal-Wallis test and the Levene test, with P<0.05 considered significant. RESULTS: In 19 different stone configurations with 133 stones, median attenuation levels were 614, 674, 681, 669, 670, 674, and 667 HU at 5, 7.5, 15, 30, 50, 70, and 140 mAs, respectively. The differences in median attenuation levels were not significantly different (P=0.998). An increasing trend of attenuation variability was noticed as the radiation dose decreased; however, this was not significant (P=1.0). CONCLUSION: Low-dose NCCT results in similar HU attenuation compared with conventional-dose NCCT. Although there is a slight increase in variability, low-dose NCCT provides similar information to assist in determining stone composition as conventional-dose NCCT.

Comparing radiation exposure between ablative therapies for small renal masses.

PURPOSE: The purpose of this study was to evaluate the amount of radiation exposure patients with small renal masses undergoing percutaneous cyroablation (PCA) or percutaneous radiofrequency ablation (PRFA) received during treatment and follow up. MATERIALS AND METHODS: A retrospective review was conducted on all patients with small renal masses <4 cm treated with PCA or PRFA over a 7-year period in a single academic center. Preoperative, operative, and post-operative variables were collected and compared. Radiation exposure received during treatment and 1 year of follow up were also determined for each modality. Statistical analysis was conducted using SPSS V.17 (SPSS, Chicago, IL). The groups were compared using the Mann-Whitney U and Pearson Chi-Square tests. Statistical significance was considered at p<0.05. RESULTS: There was no significant difference in pretreatment parameters or oncologic outcomes. The average PCA treatment radiation exposure was 39.7 mSv (15.5-133.4 mSv) compared with 22.2 mSv (8.1-67.7 mSv) for PRFA (p=0.001). During the initial year after treatment, the estimated mean treatment and follow-up radiation exposure for PCA was 134.5 mSv, compared with 117 mSv for RFA when routine computerized tomography imaging was employed. CONCLUSION: To our knowledge, this is the first published study that quantifies radiation exposure in PCA and PRFA treatment for small renal masses. These relatively high radiation exposures should be included in the informed consent for these procedures. In addition, caution should be employed when applying these technologies in young patients who are most susceptible to long-term radiation damage.

Radiation exposure during continuous and pulsed fluoroscopy.

UNLABELLED: Abstract Background and Purpose: Previous studies using pulsed fluoroscopy have shown variable effects on radiation exposure because of the ramp and trail effect in older C-arm systems. This study compares radiation delivered in pulsed and continuous modalities using a modern C-arm system. MATERIALS AND METHODS: Thermoluminescent dosimeters (TLDs) positioned in three body locations directly measured radiation dose during simulated ureteroscopy. Thirty pedal activations were administered using a pulsed or continuous mode to visualize an implanted guidewire and a radiopaque stone. TLD absorbed radiation and image quality were compared between imaging modes. RESULTS: Pulsed fluoroscopy delivered less radiation compared with continuous fluoroscopy at each site: Anterior skin (0.10 vs 0.26 mGy, P<0.001), kidney (0.15 vs 0.40 mGy, P<0.001), and posterior skin (0.92 vs 2.62 mGy, P<0.001). Mean fluoroscopy time differed between continuous and pulsed modes (12.5 vs 3.0 seconds; P<0.001). Fluoroscopy time positively correlated with radiation exposure at all sites: Anterior skin (0.017 mGy/s, R(2)=0.90), left kidney (0.026 mGy/s, R(2)=0.96), and posterior skin (0.18 mGy/sec, R(2)=0.98). When evaluated by blinded urologists, 100% of reviewers felt pulsed images were adequate to identify guidewire position and 90.5% felt pulsed images were adequate for stone localization. CONCLUSION: Pulsed fluoroscopy reduced fluoroscopy time by 76% and radiation dose by 64% compared with continuous fluoroscopy. Pulsed fluoroscopy images were adequate for most tasks of ureteroscopy and should be considered for reduction of radiation during ureteroscopy.

In automated fluoroscopy settings, does shielding affect radiation exposure to surrounding unshielded tissues?

BACKGROUND AND PURPOSE: Automatic brightness control (ABC), a function of modern fluoroscopy machines, adjusts radiation intensity in real time to enhance image quality. While shielding reduces radiation exposure to protected areas, it is unknown how much radiation adjacent unshielded areas receive when using ABC settings. Our purpose was to assess radiation dosage to shielded and unshielded tissue when using fluoroscopic ABC mode compared with fixed exposure settings. MATERIALS AND METHODS: In a simulated ureteroscopy, thermoluminescent dosimeters (TLDs) were placed at three sites in a female human cadaver, including the right renal hilum, right distal ureter adjacent to the uterus, and directly over the uterus. The cadaver received 60 seconds of radiation exposure using a C-arm fluoroscopy system under ABC and fixed settings (1.38 mAs, 66 kVp) with and without uterine shielding. Radiation dosage absorbed by the TLDs was compared using two-way analysis of variance and least-squares confidence intervals. RESULTS: Shielding significantly reduced radiation dose to the uterus by 62% and 82% (P<0.05 for both) in ABC and fixed settings, respectively. Shielding of the uterus in ABC, however, resulted in an approximately twofold increase in radiation dosage to the ureter and ipsilateral kidney (P<0.05 for both) and a decrease in image quality. Using fixed settings, shielding of the uterus did not increase radiation dose to the ipsilateral ureter and kidney. CONCLUSION: There is a significant increase in radiation dosage to surrounding tissues when shielding is used with ABC mode during fluoroscopy. Radiation can be reduced and image quality improved by using fixed settings when shielding is indicated.

Ureteral calculi detection using low dose computerized tomography protocols is compromised in overweight and underweight patients.

PURPOSE: Low dose computerized tomography protocols have demonstrated a reduction in radiation exposure while maintaining excellent sensitivity and specificity in the detection of stones in patients of average size. Low dose computerized tomography protocols have not yet been evaluated in subjects in the extremes of weight. We evaluated the effect of body weight when using low dose protocols to detect ureteral calculi. MATERIALS AND METHODS: Three cadavers of increasing weight (55, 85 and 115 kg) were prepared by inserting 721 calcium oxalate stones (range 3 to 7 mm) in 33 random configurations into urinary tracts. Cadavers were then scanned using a GE LightSpeed® at 7 radiation settings. An independent, blinded review by a radiologist was conducted to generate ROC curves, with areas under the curve compared using a 1-way ANOVA (α = 0.05). RESULTS: Sensitivity and specificity were significantly lower in the low and high weight cadavers compared to the medium weight cadaver at 5 mAs (p <0.001) and 7.5 mAs (p = 0.048). Differences in sensitivity and specificity at radiation settings of 15 mAs or greater were not significant. CONCLUSIONS: The sensitivity and specificity for the detection of ureteral calculi on computerized tomography were decreased for underweight and overweight subjects when using extremely low dose radiation settings (less than 1 mSv). Low dose protocols of 15 mAs (2 mSv) can still be used for these subjects without jeopardizing the ability to identify ureteral stones.

Prostate specific antigen levels and prostate cancer detection rates in patients with end stage renal disease.

PURPOSE: Patients with end stage renal disease plus prostate cancer are ineligible to receive a renal transplant at most centers until an acceptable cancer-free period is demonstrated. To our knowledge previously established prostate specific antigen reference ranges have not been validated in patients with end stage renal disease. We determined age stratified 95th percentile prostate specific antigen reference ranges and the prostate cancer detection rate at specific prostate specific antigen intervals for patients with end stage renal disease. MATERIALS AND METHODS: We retrospectively reviewed the records of 775 male patients with end stage renal disease on the waiting list for a renal transplant who had undergone a serum prostate specific antigen test. Prostate specific antigen was stratified by age at the time of the blood test and 95th percentile reference ranges were calculated for each decade. A total of 80 patients underwent prostate biopsy for increased prostate specific antigen and/or abnormal digital rectal examination. The cancer detection rate was calculated for specific prostate specific antigen reference ranges. RESULTS: The age specific 95th percentile prostate specific antigen references ranges were 0 to 4.0 ng/ml for ages 40 to 49 in 137 patients, 0 to 5.3 ng/ml for ages 50 to 59 in 257, 0 to 10.5 ng/ml for ages 60 to 69 in 265 and 0 to 16.6 ng/ml for ages 70 to 79 years in 69. The cancer detection rate was 44%, 38% and 67% for prostate specific antigen 2.5 to 4.0, 4 to 10 and greater than 10 ng/ml, respectively. CONCLUSIONS: In our study population of patients with end stage renal disease age stratified prostate specific antigen was higher than in the general population. The cancer detection rate was increased in our patients with end stage renal disease compared to that in patients with normal renal function at specific prostate specific antigen intervals. Lower prostate specific antigen cutoffs may be appropriate to recommend prostate biopsy in patients with end stage renal disease.

Donor Smoking Negatively Affects Donor and Recipient Renal Function following Living Donor Nephrectomy.

Background. While tobacco use by a renal transplant recipient has been shown to negatively affect graft and patient survival, the effect of smoking on the part of the kidney donor remains unknown. Methods. 29 smoking donors (SD) and their recipients (SD-R) as well as 71 non-smoking donors (ND) and their recipients (ND-R) were retrospectively reviewed. Preoperative demographics and perioperative variables including serum creatinine (Cr) and glomerular filtration rate (GFR) were calculated and stratified by amount of tobacco exposure in pack-years. Clinical outcomes were analyzed with a Student's t-test, chi-square, and multiple linear regression analysis (α = 0.05). Results. At most recent followup, SD-R's had a significantly smaller percent decrease in postoperative Cr than ND-R's (-57% versus -81%; P = 0.015) and lower calculated GFR's (37.0 versus 53.0 mL/min per 1.73 m(2); P < 0.001). SD's had a larger percent increase in Cr than ND's at most recent followup (57% versus 40%; P < 0.001), with active smokers having a larger increase than those who quit, although this difference was not statistically significant (68% versus 52%; P = 0.055). Conclusions. Use of tobacco by kidney donors is associated with decreased posttransplant renal function, although smoking cessation can improve outcomes. Kidneys from donors who smoke should be used with caution.

Robot-assisted radical prostatectomy in patients with previous renal transplantation.

PURPOSE: To evaluate the outcomes of robot-assisted radical prostatectomy (RARP) in patients with previous renal transplantation. PATIENTS AND METHODS: We retrospectively identified all patients who had undergone RARP for localized prostate cancer between 2005 and 2008 at a single institution (N=228). Of these, three patients were renal transplant recipients. A four-arm robotic configuration was used in all patients. Port placement was modified in two of the three renal transplant recipients to avoid trauma to the renal allograft. Preoperative demographics, perioperative parameters, and postoperative outcomes were reviewed. RESULTS: RARP was completed successfully in all three renal transplant recipients. As expected, the American Society of Anesthesiologists score (3.3 vs 2.4) and Charlson weighted index of comorbidity (4.7 vs 2.4) were greater in previous transplant patients. There were no major differences in mean age, Gleason score, body mass index, estimated blood loss, operative time, complications, or oncologic outcomes between the two groups. Each of the patients with renal allografts had an undetectable prostate-specific antigen level and was continent (needing no pads) at 13 months of follow-up. CONCLUSIONS: RARP is feasible in patients with a previous renal transplant. Although technically more challenging, RARP can be performed in previous transplant patients with acceptable morbidity and oncologic outcomes similar to those of other prostate cancer patients.

A prospective randomized comparison of traditional laparoendoscopic single-site surgery with needlescopic-assisted laparoscopic nephrectomy in the porcine model.

BACKGROUND AND PURPOSE: Laparoendoscopic single-site (LESS) surgery produces virtually no scar but is technically challenging because of the loss of triangulation. The objective of this study is to compare classic transumbilical LESS nephrectomy with needlescopic-assisted laparoscopy (NAL) surgery. In doing so, we evaluated whether the addition of a single 2-mm subcostal port could restore triangulation while not jeopardizing recovery or cosmetic outcome in the porcine model. MATERIALS AND METHODS: Ten female farm pigs were randomized to laparoscopic nephrectomy with either LESS or NAL. In LESS, a TriPort was placed through a single 2.5-cm umbilical incision. In NAL, 5- and 10-mm ports were placed in the umbilicus and a 2-mm port was placed in the midclavicular line. Preoperative, perioperative, and postoperative parameters were compared. Variables were analyzed with the Wilcoxon signed-rank test and two-tailed Fisher exact test. Cosmesis was evaluated objectively using the Vancouver Scar Scale and subjectively by a blinded dermatologist. A cost analysis was performed. RESULTS: Estimated blood loss was minimal in both groups (28.8 mL in LESS and 9.4 mL in NAL). Operative time was significantly shorter in NAL (103 vs 150 min; P<0.001). There was no difference in complications (2 vs 1; P=0.500), objective cosmesis (3.9 vs 3.8; P>0.2), or subjective cosmesis (2 vs 3; P=0.500). The NAL protocol had significantly lower disposable equipment costs ($363 vs $1696). CONCLUSIONS: The addition of a 2-mm subcostal port and the restoration of triangulation in the NAL protocol enable shorter operative times, increased surgeon comfort, improved technical ease, and lower costs while maintaining the scarless cosmesis of the traditional LESS protocol.

Patients with end-stage renal disease are candidates for robot-assisted laparoscopic radical prostatectomy.

BACKGROUND AND PURPOSE: Patients with end-stage renal disease (ESRD) have multiple comorbidities that place them at increased risk for surgical complications. Consequently, patients with both ESRD and prostate cancer (PCa) have rarely been considered candidates for radical prostatectomy. The objective of this study is to compare ESRD patients who are undergoing robot-assisted laparoscopic prostatectomy (RALP) with a cohort of patients with no history of dialysis. PATIENTS AND METHODS: A retrospective review was conducted of 430 patients who were undergoing RALP, including 12 receiving dialysis at the time of surgery. Preoperative demographics, perioperative parameters, and postoperative outcomes were compared using a two-tailed Student t test and a chi-square test, with significance at P<0.05. RESULTS: Patient demographics including body mass index, Gleason score, and prostate-specific antigen (PSA) value were similar between the two groups. Patients with ESRD had younger age (55.5 vs 62.9 years; P<0.01), higher American Society of Anesthesiologists scores (3.7 vs 2.5; P<0.01), and higher age-adjusted Charlson Comorbidity Index scores (6.2 vs 4.2; P<0.01). Patient outcomes including operative time, estimated blood loss, complication rate, postoperative stay, and positive margins did not differ significantly between groups. No ESRD patients needed pads or had a detectable PSA level using an ultrasensitive assay. CONCLUSIONS: This series represents the largest series of patients with ESRD undergoing RALP. These patients experienced similar outcomes compared with patients with no history of dialysis despite greater preoperative comorbidity. RALP produces minimal fluid shifts, low blood loss, and excellent cancer control, making it an ideal treatment option to prepare patients with both ESRD and PCa for renal transplantation.

Ocular complications after open and hand-assisted laparoscopic donor nephrectomy.

OBJECTIVES: To compare the incidence of ocular complications (OC) and corneal abrasion (CA) after hand-assisted laparoscopic donor nephrectomy (HALDN) and open donor nephrectomy (ODN). METHODS: A retrospective review was conducted of 241 consecutive patients (141 HALDN and 100 ODN) over a 9-year period. OC were strictly defined as ocular complaints requiring any treatment or ophthalmologic consultation. Chi-square tests were used to compare the incidence of OC and CA by type of surgery. RESULTS: OC were observed in 9 HALDN patients (6.4%) and no ODN patients (0%; P = .01). All OC in HALDN patients involved the dependent eye (P <.001). CA occurred in 2 HALDN patients (1.4%) compared with no ODN patients (0%; P = .23). HALDN patients had significantly higher net fluid intake than the ODN patients (P <.01). CONCLUSIONS: The increased OC and CA seen in HALDN patients may result from the increased fluid intake, flank positioning, and potential increased venous compression resulting from the effects of the pneumoperitoneum. The fact that the dependent eye was involved in all patients suggests conjunctival edema as a potential common pathway. The high frequency of OC suggests the importance of techniques to minimize OC after HALDN.

Effect of low dose radiation computerized tomography protocols on distal ureteral calculus detection.

PURPOSE: Unenhanced multidetector computerized tomography is the imaging modality of choice for urinary calculi but exposes patients to substantial radiation doses with a subsequent risk of radiation induced secondary malignancy. We compared ultra low dose and conventional computerized tomography protocols for detecting distal ureteral calculi in a cadaveric model. MATERIALS AND METHODS: A total of 85 calcium oxalate stones 3 to 7 mm long were prospectively placed in 14 human cadaveric distal ureters in 56 random configurations. The intact kidneys, ureters and bladders were placed in a human cadaveric vehicle and computerized tomography was performed at 140, 100, 60, 30, 15 and 7.5 mA seconds while keeping other imaging parameters constant. Images were independently reviewed in random order by 2 blinded radiologists to determine the sensitivity and specificity of each mA second setting. RESULTS: Overall sensitivity and specificity were 98% and 83%, respectively. Imaging using 140, 100, 60, 30, 15 and 7.5 mA second settings resulted in 98%, 97%, 97%, 96%, 98% and 97% sensitivity, and 83%, 83%, 83%, 86%, 80% and 84% specificity, respectively. Interobserver agreement was excellent (kappa >0.87). There was no significant difference in sensitivity or specificity at any mA second settings. All false-negative results were noted for 3 mm calculi at a similar frequency at each mA second setting. CONCLUSIONS: Ultra low dose computerized tomography protocols detected distal ureteral calculi in a fashion similar to that of conventional computerized tomography protocols in a cadaveric model. These protocols may decrease the radiation dose up to 95%, reducing the risk of secondary malignancies.