Tag: statistics

Updates Surg. 2024 May 27. doi: 10.1007/s13304-024-01853-z. Online ahead of print.

ABSTRACT

Fluorescence imaging is a real-time intraoperative navigation modality to enhance surgical vision and it can guide emergency surgeons while performing difficult, high-risk surgical procedures. The aim of this study is to assess current knowledge, attitudes, and practices of emergency surgeons in the use of indocyanine green (ICG) in emergency settings. Between March 08, 2023 and April 10, 2023, a questionnaire composed of 27 multiple choice and open-ended questions was sent to 200 emergency surgeons who had previously joined the ARtificial Intelligence in Emergency and trauma Surgery (ARIES) project promoted by the WSES. The questionnaire was developed by an emergency surgeon with an interest in advanced technologies and artificial intelligence. The response rate was 96% (192/200). Responders affirmed that ICG fluorescence can support the performance of difficult surgical procedures in the emergency setting, particularly in the presence of severe inflammation and in evaluating bowel viability. Nevertheless, there were concerns regarding accessibility and availability of fluorescence imaging in emergency settings. Eighty-seven out of 192 (45.3%) respondents have a fluorescence imaging system of vision for both elective and emergency surgical procedures; 32.3% of respondents have this system solely for elective procedures; 21.4% of respondents do not have this system, 15% do not have experience with it, and 38% do not use this imaging in emergency surgery. Less than 1% (2/192) affirmed that ICG fluorescence changed always their intraoperative decision-making. Precision surgery effectively tailors surgical interventions to individual patient characteristics using advanced technology, data analysis and artificial intelligence. ICG fluorescence can serve as a valid and safe tool to guide emergency surgery in different scenarios, such as intestinal ischemia and severe acute cholecystitis. Due to the lack of high-level evidence within this field, a consensus of expert emergency surgeons is needed to encourage stakeholders to increase the availability of fluorescence imaging systems and to support emergency surgeons in implementing ICG fluorescence in their daily practice.

PMID:38801604 | DOI:10.1007/s13304-024-01853-z

Updates Surg. 2024 May 27. doi: 10.1007/s13304-024-01879-3. Online ahead of print.

ABSTRACT

There are three types of complications stoma related: ones related to its construction, ones related to its function and related to closure. The aim of this study was to assess the risk of complications related to the stoma presence and to identificate variables related to complications. We conducted a retrospective study of patients who underwent sphincter-preserving elective surgery for benign condition between January 2013 and December 2020 at IRCCS Sacro Cuore Don Calabria Hospital in Negrar, Verona. Data were collected regarding demographics and complications associated with primary surgery, stoma closure and the interval period. Univariable and multivariable analysIs were conducted. A total of 446 (12.2%) diverting loop ileostomies were performed. At index procedure, 76 (17%) patients had complications and 34 patients had complications related to ileostomy creation. Twenty patients (4.4%) were re admitted before stoma closure for dehydration. One hundred and eighty-seven patients (41.9%) suffered from ileostomy management’s problems. At univariate analysis, complications of having stoma are more frequent in elder patients (p = 0.013), ASA score > 2 (p = 0.02), IBD diagnosis (p = < 0.001) and patients who had ileostomy creation complications (p = 0.04). At stoma closure, 55 (12.3%) patients had complications. Forty-seven patients (10.5%) presented incisional hernia in the stoma closure site. Ileostomy closure complications are more common with ASA score > 2 (p = 0.01) and IBD diagnosis (p < 0.001). IBD was found an independent factor of poor outcome at the time of ileostomy creation and closure. Developing complications at the time of ileostomy creation is statistically related to develop complications during ileostomy maintenance at multivariable analysis A loop ileostomy is usually created to limit the potentially life-threatening consequenceS of anastomotic leakage, but it is not able to decrease the leak-related mortality, wound sepsis, postoperative bleeding and small bowel obstruction. Debate rises not only for its uncertain efficacy but also because of the significant morbidity related to stoma. The surgeon could use these data in order to tailor his surgical strategy to the patients and their disease.

PMID:38801603 | DOI:10.1007/s13304-024-01879-3

Updates Surg. 2024 May 27. doi: 10.1007/s13304-024-01874-8. Online ahead of print.

ABSTRACT

Pulmonary metastasectomy in colorectal cancer (CRC) has encouraging results; however, specific criteria for lung resection and the timing of resection remain undetermined. Therefore, in this study, we aimed to examine the long-term prognosis and 10-year survival rates and analyze poor prognostic factors in patients who underwent resection of pulmonary metastases from CRC. This retrospective, single-institution study included 156 patients with controlled primary CRC and metastases confined to the lungs or liver who underwent pulmonary metastasectomy between 2005 and 2022. Statistical analyses were conducted using the X² and two-tailed Student’s t test to compare variables. The receiver operating characteristic (ROC) curve was used to determine the appropriate cut-off point for tumor size as a predictive factor of survival. Recurrence-free survival (RFS) and overall survival (OS) were estimated using the Kaplan-Meier method, and non-parametric group comparisons were performed using log-rank tests. The 5- and 10-year OS rates were 67% and 59%, respectively. Further, there was no recurrence 38 months post-surgery, and the RFS curve plateaued. Moreover, by 88 months post-surgery, no deaths occurred, and the OS curve plateaued. Multivariate analysis revealed that a pulmonary metastatic tumor >14 mm and disease-free interval <2 years indicated poor prognosis. The RFS curve for pulmonary metastasectomy may plateau approximately 3 years after surgery. Pulmonary metastasectomy can achieve long-term survival in selected patients with CRC. Furthermore, surgical resection of recurrence after pulmonary metastasectomy may lead to better results. Thus, tumor size and disease-free interval may be independent prognostic factors.

PMID:38801601 | DOI:10.1007/s13304-024-01874-8

BJPsych Open. 2024 May 27;10(3):e121. doi: 10.1192/bjo.2024.711.

ABSTRACT

BACKGROUND: Growing numbers of students now seek mental health support from their higher education providers. In response, a number of universities have invested in non-clinical well-being services, but there have been few evaluations of these. This research addresses a critical gap in the existing literature.

AIMS: This study examined the impact of introducing non-clinical well-being advisers on student mental health and help-seeking behaviour at a large UK university.

METHOD: Survey data collected pre-post service introduction in 2018 (n = 5562) and 2019 (n = 2637) measured prevalence of depression (Patient Health Questionnaire-9), anxiety (Generalised Anxiety Disorder-7), and low mental well-being (Warwick-Edinburgh Mental Wellbeing Scale), alongside student support-seeking behaviour. Logistic regression models investigated changes in outcome measures. Administrative data (2014-2020) were used to investigate corresponding trends in antidepressant prescribing at the onsite health service, student counselling referrals and course withdrawal rates.

RESULTS: Adjusted models suggested reductions in students’ levels of anxiety (odds ratio 0.86, 95% CI 0.77-0.96) and low well-being (odds ratio 0.84, 95% CI 0.75-0.94) in 2019, but not depression symptoms (odds ratio 1.05, 95% CI 0.93-1.17). Statistical evidence showed reduced student counselling referrals, with antidepressant prescribing and course withdrawal rates levelling off. Student perception of the availability and accessibility of university support improved.

CONCLUSIONS: Our findings suggest a non-clinical well-being service model may improve student perception of support, influence overall levels of anxiety and low well-being, and reduce clinical need. The current study was only able to examine changes over the short term, and a longer follow-up is needed.

PMID:38800994 | DOI:10.1192/bjo.2024.711

Int J Numer Method Biomed Eng. 2024 May 27:e3835. doi: 10.1002/cnm.3835. Online ahead of print.

ABSTRACT

Microwave ablation has become a viable alternative for cancer treatment for patients who cannot undergo surgery. During this procedure, a single-slot coaxial antenna is employed to effectively deliver microwave energy to the targeted tissue. The success of the treatment was measured by the amount of ablation zone created during the ablation procedure. The significantly large blood vessel placed near the antenna causes heat dissipation by convection around the blood vessel. The heat sink effect could result in insufficient ablation, raising the risk of local tumor recurrence. In this study, we investigated the heat loss due to large blood vessels and the relationship between blood velocity and temperature distribution. The hepatic artery, with a diameter of 4 mm and a height of 50 mm and two branches, is considered in the computational domain. The temperature profile, localized tissue contraction, and ablation zones were simulated for initial blood velocities 0.05, 0.1, and 0.16 m/s using the 3D Pennes bio-heat equation, temperature-time dependent model, and cell death model, respectively. Temperature-dependent blood velocity is modeled using the Navier-Stokes equation, and the fluid-solid interaction boundary is treated as a convective boundary. For discretization, we utilized $H\left(\mathrm{curl},\Omega \right)$ elements for the wave propagation model, $H^1\left(\Omega \right)$ elements for the Pennes bio-heat model, and ${\left(H^1\left(\Omega \right)\right)}^3\times L_0^2\left(\Omega \right)$ elements for the Navier-Stokes equation, where $\Omega$ represents the computational domain. The simulated results show that blood vessels and blood velocity have a significant impact on temperature distribution, tissue contraction, and the volume of the ablation zone.

PMID:38800993 | DOI:10.1002/cnm.3835

J Vasc Access. 2024 May 27:11297298241254633. doi: 10.1177/11297298241254633. Online ahead of print.

ABSTRACT

BACKGROUND: Ultrasound guidance can reduce the number of attempts to gain peripheral IV access while improving the success rate and satisfaction in patients with difficult IV access. Education and simulation are effective tools for improving the skills and knowledge related to ultrasound-guided peripheral IV access. Ultrasound phantom models allow for skill development without the risk of patient harm.

METHODS: Twenty-nine registered nurses and nurse practitioners were recruited for education and simulation regarding ultrasound-guided peripheral IV (USGPIV) placement. Participants completed a survey evaluating the efficacy of the phantom models in addition to pre- and post-intervention confidence, perceived competence, knowledge surveys, and a Directly Observed Procedural Skills Evaluation (DOPSE). The intervention included an educational PowerPoint and open practice session using the phantom models.

RESULTS: Statistically significant improvements were found in participants’ confidence (p < 0.001; 95% CI: 5.287, 9.499; d = 1.31), perceived competence (p < 0.001; 95% CI: 1.231, 2.742; d = 1.20), knowledge (p < 0.001; 95% CI: 1.079, 2.163; d = 1.47), and skills (p < 0.001; 95% CI: 2.499; 5.501; d = 1.29). Participants improved in maintaining needle visualization (p < 0.001; 95% CI: 0.272, 0.9; d = 0.79) and decreasing their cannulation attempts (0.045; 95% CI: 0.013, 1.022; d = 0.48). Participants with no and novice experience saw statistically significant improvement across all categories (p < 0.02) compared to those with intermediate, advanced, or expert experience with ultrasound. 96.5% of participants could perform ultrasound-guided peripheral IV cannulation independently or with indirect supervision following the intervention.

CONCLUSIONS: At $36.52 per model, the self-assembled ultrasound phantom models provided a cost-effective and sustainable solution to teaching ultrasound-guided peripheral IV cannulations. Education and simulation for ultrasound-guided peripheral vascular access may benefit individuals with no or novice ultrasound experience.

PMID:38800992 | DOI:10.1177/11297298241254633

Addiction. 2024 May 27. doi: 10.1111/add.16531. Online ahead of print.

ABSTRACT

AIMS: To measure nicotine delivery, vaping topography and subjective effects of current generations of disposable, cartridge-based and other types of electronic cigarettes (e-cigarettes) among young adults.

DESIGN, SETTING, PARTICIPANTS: Observational, human laboratory assessment of e-cigarette use in Columbus, Ohio, USA (July 2020 to June 2021). Participants (n = 96, 60.4% female, age mean = 21.7 [standard deviation = 1.7] years, 82.4% white race) were identified via their participation in a cohort study or other convenience sampling and were 18 to 25 years old, vaped ≥4 days/week for ≥4 weeks and used other tobacco products for ≤5 days of past 30 days. Participants completed a pre-vaping questionnaire, vaped their usual brand of e-cigarette ad libitum for 30 min and completed a post-vaping questionnaire.

MEASUREMENTS: Outcome variables included pre- and post-vaping measures of plasma nicotine (t = 0 and t = 30, respectively) and craving and withdrawal symptoms, as well as vaping topography (e.g. flow rate and inter-puff interval), pre-vaping expectancies and post-vaping product appeal. Variables used to characterize the sample included demographics, e-cigarette and other tobacco use history, e-cigarette dependence and e-cigarette device characteristics (e.g. device type, flavor and nicotine form).

FINDINGS: Participants reported moderate nicotine dependence on average via the E-Cigarette Dependence Scale (mean = 6.9 [standard deviation = 4.0]). Following 30 min of ad libitum vaping, participants achieved substantial plasma nicotine boost (mean = 18.8 [standard deviation = 14.5] ng/mL), corresponding with statistically significant decreases in withdrawal symptoms measured via the Minnesota Nicotine Withdrawal Scale (pre-vaping mean = 9.0 [standard deviation = 5.1], post-vaping mean = 4.3 [standard deviation = 3.9]; P-value <0.0001). Pre-vaping, participants reported moderate vaping expectancies (e.g. mean = 2.5 [standard deviation = 1.0] on a scale from 0 to 4 for smell and taste expectancies); post-vaping, participants reported high satisfaction (mean = 4.6 [standard deviation = 1.2] on a scale from 1 to 7) and moderate reward (mean = 2.9 [standard deviation = 1.2]) and respiratory sensations (mean = 3.7 [standard deviation = 1.6]). Nearly half of participants (47.9%) used disposable e-cigarettes, and most used a mint/menthol or fruit flavored (99.0%) and nicotine salt (98.9%) e-liquid.

CONCLUSIONS: Among young adults in the United States, the latest generations of e-cigarettes appear to deliver large quantities of nicotine (similar to cigarettes) and significantly relieve withdrawal symptoms, and they are appealing.

PMID:38800982 | DOI:10.1111/add.16531

Stat Med. 2024 May 27. doi: 10.1002/sim.10113. Online ahead of print.

ABSTRACT

We propose a Bayesian model selection approach that allows medical practitioners to select among predictor variables while taking their respective costs into account. Medical procedures almost always incur costs in time and/or money. These costs might exceed their usefulness for modeling the outcome of interest. We develop Bayesian model selection that uses flexible model priors to penalize costly predictors a priori and select a subset of predictors useful relative to their costs. Our approach (i) gives the practitioner control over the magnitude of cost penalization, (ii) enables the prior to scale well with sample size, and (iii) enables the creation of our proposed inclusion path visualization, which can be used to make decisions about individual candidate predictors using both probabilistic and visual tools. We demonstrate the effectiveness of our inclusion path approach and the importance of being able to adjust the magnitude of the prior’s cost penalization through a dataset pertaining to heart disease diagnosis in patients at the Cleveland Clinic Foundation, where several candidate predictors with various costs were recorded for patients, and through simulated data.

PMID:38800970 | DOI:10.1002/sim.10113

J Thorac Imaging. 2024 May 27. doi: 10.1097/RTI.0000000000000791. Online ahead of print.

ABSTRACT

OBJECTIVES: To investigate the predictive value of coronary computed tomography angiography-derived fractional flow reserve (CT-FFR) before percutaneous coronary intervention (PCI) to predict target vessel failure (TVF) after stent implantation.

METHODS: This retrospective study included 429 patients (429 vessels) who underwent PCI and stent implantation after CCTA within 3 months. All patients underwent coronary stent implantation between January 2012 and December 2019. A dedicated workstation (Syngo Via, Siemens) was used to analyze and measure the CT-FFR value. The cut-off values of pre-PCI CT-FFR for predicting TVF were defined as 0.80 and the value using the log-rank maximization method, respectively. The primary outcome was TVF, defined as a composite of cardiac death, target vessel myocardial infarction, and clinically driven target vessel revascularization (TVR), which was a secondary outcome.

RESULTS: During a median 64.0 months follow-up, the cumulative incidence of TVF was 7.9% (34/429). The cutoff value of pre-PCI CT-FFR based on the log-rank maximization method was 0.74, which was the independent predictor for TVF [hazard ratio (HR): 2.61 (95% CI: 1.13, 6.02); P=0.024] and TVR [HR: 3.63 (95%CI: 1.25, 10.51); P=0.018]. Compared with the clinical risk factor model, pre-PCI CT-FFR significantly improved the reclassification ability for TVF [net reclassification improvement (NRI), 0.424, P<0.001; integrative discrimination index (IDI), 0.011, P=0.022]. Adding stent information to the prediction model resulted in an improvement in reclassification for the TVF (C statistics: 0.711, P=0.001; NRI: 0.494, P<0.001; IDI: 0.020, P=0.028).

CONCLUSIONS: Pre-PCI CT-FFR ≤0.74 was an independent predictor for TVF or TVR, and integration of clinical, pre-PCI CT-FFR, and stent information models can provide a better risk stratification model in patients with stent implantation.

PMID:38800956 | DOI:10.1097/RTI.0000000000000791

LGBT Health. 2024 May 27. doi: 10.1089/lgbt.2023.0436. Online ahead of print.

ABSTRACT

Purpose: We aimed to understand transgender and nonbinary (TNB) young adults’ desire to receive gender-affirming medical care (GAMC) before age 18 and identify barriers and facilitators to receiving this care in adolescence. Methods: A cross-sectional survey was administered to TNB young adults presenting for care between ages 18 and 20 in 2023. Descriptive statistics characterized the sample, χ² tests with post hoc pairwise comparisons identified differences in desire for gender-affirming medications, outness, and parental consent by gender identity and sex assigned at birth, and t-tests evaluated differences in barriers and facilitators to receiving care by outness to parents. Results: A total of 230 TNB respondents had complete data. Nearly all (94.3%) indicated they desired GAMC before age 18. Half (55.7%) of the respondents reported being out about their gender identity to a parent before age 18. Outness, discussing desire for GAMC, and asking for consent to receive GAMC from a parent were significantly more common among participants who identified as men compared to those who identified as women and among those assigned female at birth compared to those assigned male at birth. No such differences emerged when comparing nonbinary individuals to those who identified as men or women. Lack of parental willingness to consent for GAMC was cited as the primary contributor of not having received care in adolescence. Conclusions: Many TNB young adults desire GAMC in adolescence; however, lack of parental support is a key barrier to receiving this care, suggesting a need for more readily available resources for parents to support TNB adolescents.

PMID:38800949 | DOI:10.1089/lgbt.2023.0436