Evidence of free tropospheric and long-range transport of microplastic at Pic du Midi Observatory

The emerging threat of atmospheric microplastic pollution has prompted researchers to study areas previously considered beyond the reach of plastic. Investigating the range of atmospheric microplastic transport is key to understanding the global extent of this problem. While atmospheric microplastics have been discovered in the planetary boundary layer, their occurrence in the free troposphere is relatively unexplored. Confronting this is important because their presence in the free troposphere would facilitate transport over greater distances and thus the potential to reach more distal and remote parts of the planet. Here we show evidence of 0.09-0.66 microplastics particles/m³ over 4 summer months from the Pic du Midi Observatory at 2877 meters above sea level. These results exhibit true free tropospheric transport of microplastic, and high altitude microplastic particles <50 µm (aerodynamic diameter). Analysis of air/particle history modelling shows intercontinental and trans-oceanic transport of microplastics illustrating the potential for global aerosol microplastic transport.

Temporal Archive of Atmospheric Microplastic Deposition Presented in Ombrotrophic Peat

Ombrotrophic peatland-fed solely from atmospheric deposition of nutrients and precipitation-provide unique archives of atmospheric pollution and have been used to illustrate trends and changes in atmospheric trace element composition from the recent decadal to the Holocene period. With the acknowledgment of atmosphere plastic pollution, analysis of ombrotrophic peat presents an opportunity to characterize the historical atmospheric microplastic pollution prevalence. Ombrotrophic peatland is often located in comparatively pristine mountainous and boreal areas, acting as sentinels of environmental change. In this paired site study, a Sphagnum ombrotrophic peat record is used for the first time to identify the trend of atmospheric microplastic pollution. This high altitude, remote location ombrotrophic peat archive pilot study identifies microplastic presence in the atmospheric pollution record, increasing from <5(±1) particles/m²/day in the 1960s to 178(±72) particles/m²/day in 2015-2020 in a trend similar to the European plastic production and waste management. Compared to this catchment's lake sediment archive, the ombrotrophic peat core appears to be effective in collecting and representing atmospheric microplastic deposition in this remote catchment, collecting microplastic particles that are predominantly ≤20 μm. This study suggests that peat records may be a useful tool in assessing the past quantities and trends of atmospheric microplastic.

Internal jugular vein ultrasound in patients with chronic congestive heart failure

Background

Bedside assessment of intravascular volume in patients with chronic congestive heart failure (CHF) is often difficult. Under- and over-diuresis are common causes of morbidity and readmissions in these patients.

Purpose

We hypothesized that ultrasound assessment of the internal jugular vein would be easier and more reproducible than clinically assessing jugular venous pressure (JVP). Our goal was to create a bedside test that would be simpler to learn than inferior vena cava (IVC) assessment and easier to perform in obese patients.

Methods

Adults with HF (n=53, 52% men, mean age 65 years, mean BMI 29.6 kg/m2, mean LVEF 44%) scheduled for right heart catheterization (RHC) had an ultrasound of their right internal jugular (RIJ) vein performed immediately prior. Cross-sectional area of RIJ was measured during normal breathing with patients at 90 and 45 degrees recumbency and was indexed by height (RIJI). JVP was also assessed clinically. Results were compared to right atrial pressure (RAP) measured by RHC. Operators were blinded to RHC results and vice versa.

Results

JVP was correctly assessed clinically in only 43%. RIJI at 90 and 45 degrees were significantly larger in patients with elevated RAP compared to euvolemic patients (Table). At 90 degrees, RIJI of &gt;15 predicted a RAP of &gt;10 mmHg with 68% sensitivity and 72% specificity. At 45 degrees, RIJI of &gt;10 predicted a RAP of &gt;10 mmHg with 94% sensitivity and a negative predictive value of 80% (Table). Simply being able to see the RIJ at 90 degrees (n=34) had an 82.4% positive predictive value for elevated RAP. IVC data could not be obtained on 23% of patients due to body habitus or inability to lay flat.

Conclusion

Ultrasonographic RIJI is more accurate than clinical assessment in patients with CHF and can be accurately performed even in obese patients. It requires only a basic linear ultrasound probe and was easily performed by clinicians at various stages of training with reproducible results. With the increased availability of bedside ultrasound in clinical practice, it is a feasible method of evaluating chronic CHF patients.

Funding Acknowledgement

Type of funding sources: None.

1191 The Use of CT Urography to Diagnose Upper Tract Urothelial Carcinomas (UTUC); Managing Surgical Resources During The COVID-19 Pandemic

Introduction

Upper tract urothelial carcinomas (UTUC) account for 5-10% of urothelial malignancies. Rapid diagnosis is essential as 60% are invasive at diagnosis and confer poor prognoses. European Association of Urology (EAU) guidelines recommend CT urography (CTU) for initial diagnosis and staging of UTUCs. Diagnostic ureteroscopy (URS) is used second line where diagnosis is unclear. The COVID-19 pandemic has limited theatre access and may delay diagnosis of suspected UTUC. Our aim was to evaluate specific CTU findings in predicting UTUC to aid prompt diagnosis and risk stratification in a tertiary centre.

Method

A retrospective analysis was performed on 122 patients who underwent CTU with diagnostic URS over two years from 2018-2019 for possible UTUC. Data including demographics, imaging and histology were collected from our electronic database.

Results

57 patients had confirmed UTUC, all had CT changes. CTU had an overall positive predictive value (PPV) of 45%. CT findings were divided into: hydronephrosis; filling defect/lesion; urothelial thickening; normal; or other. The PPV was highest for filling defects/lesions at 60%, hydronephrosis was 38%, urothelial thickening was 30%, and other was 33%. Of those with high-grade histology, 61% had evidence of filling defects/lesions and 24% had hydronephrosis.

Conclusions

A specific CTU finding of filling defect/lesion in combination with cytology can aid diagnosis and risk stratification of UTUC. This may enable us to reduce use of diagnostic URS, as well as associated risks of intravesical seeding, necessary in the COVID-19 pandemic. With other CTU findings of hydronephrosis or urothelial thickening, a diagnostic URS may be required.

1054 A Simple Intervention to Minimise the Incidence of The Forgotten Ureteric Stent: Updating the Surgical Discharge Summary

Introduction

Ureteric stents are routinely used in ureteric obstruction, however, have considerable morbidity with major complications, such as encrustation, obstruction, urosepsis, and renal failure if left in situ for longer than six months. Despite an electronic stent register, there are still multiple emergency admissions of complications from forgotten stents, as well as those presenting with significant stent symptoms. Often stents are inserted as an emergency procedure with minimal information given on their discharge summary. A discharge template was therefore introduced that could also serve as a patient information leaflet to help minimise the incidence of forgotten stents.

Method

A discharge template was designed based off the trust-endorsed and British Association of Urological Surgeons (BAUS) patient leaflet and distributed amongst the juniors. A total of 28 patients were interviewed via telephone questionnaires – 21 randomly selected pre-intervention and 7 post-intervention from a one-month scale either side of the intervention. The template included: information on stents, common stent symptoms, indications to seek healthcare advice, and contact details to use in the event they are lost to follow-up.

Results

Patients aware that stents should be changed within six months went from 52% to 100%. Awareness of stent symptoms and red-flag symptoms went from 52% to 91%, and 57% to 100% respectively. Those who felt they had sufficient information on the discharge letter to understand their stent increased from 52 to 89%.

Conclusions

Significant improvement in patient understanding of stents and therefore hopefully in appropriate health-seeking behaviour, patient rapport, safety, and improvement in stents removed within target.

Real-world patterns of chemotherapy and immunotherapy utilization at end of life in a large community oncology network

22

Background: End-of-life anti-neoplastic treatment does not improve quality of life nor prolong survival of advanced cancer patients. It is also not cost-effective. To-date, there has been little data examining real-world patterns of chemotherapy and immunotherapy treatment at end of life. We investigated use of chemotherapy and/or immunotherapy in the last 14 days of life across a community oncology network of 5 practices, 100 sites of care, and 160 oncology providers. Methods: Using a real-time, network-wide database, we identified patients with solid tumor malignancies who died during an episode of active treatment, defined as having received intravenous (IV) chemotherapy and/or immunotherapy within 90 days of death. We then identified patients in this cohort who received IV chemotherapy and/or IV immunotherapy within 14 days of death (TxEoL). We studied TxEoL patterns by cancer type, treatment type, line of therapy, patient age, patient race, and oncology provider years in practice. Statistical significance was assessed using Pearson’s Chi-squared test. Results: 2,858 qualifying solid tumor cancer patients with dates of death between 1/1/2019 and 5/31/2020 were identified. Observed rates of TxEoL were 16.7% for immunotherapy alone vs. 19.6% for chemotherapy +/- immunotherapy (p = 0.09). We found high variation in TxEoL across 132 oncologists that had 5 or more deceased patients (range: 0% to 50%, mean: 19.2%, median: 19.6%). We found no association of TxEOL with physician years in practice, patient age or race. Rates of TxEoL in the first-line setting were significantly higher than in second-line setting or later (23.3% versus 16.4%, p < 0.01). Patients with head and neck, pancreatic, and hepatobiliary malignancies were the most likely to receive TxEoL, while patients with prostate, brain, and ovarian malignancies were the least likely to receive TxEoL. Conclusions: Our data and method identified wide variation in TxEoL patterns across a large community oncology network, suggesting room for provider-level interventions to improve treatment decisions in patients at high risk of death. Studies within our group, such as examining the impact of palliative care referrals on IV anti-cancer treatment in patients potentially facing end of life, are ongoing.

Finding value in social media: A collaborative online communication platform linking providers to education and an online tumor board across a large community of oncology practices

305

Background: Clinical collaboration across fragmented and often small clinic sites can be challenging. As a potential solution, OneOncology, a national community oncology network, launched OneCommunity, a secure, interactive online platform used across our network of six practices and over 130 clinic sites. One feature is a “virtual” tumor board where physicians can post complex cases at any time and obtain input from disease-specific experts from within the network. Members can also post, comment and disseminate information about policy and education updates affecting oncology. Methods: OneCommunity launched on December 15, 2019 and all 442 members of OneOncology were allowed access. We tracked numbers of membership, tumor board cases, policy updates and questions, views and responses per post, and response time for tumor board and policy posts during the study period from launch through June 11, 2020. Results: In the first six months of use, 277 providers signed up and logged into the platform. 71 individual patient cases were presented across 10 specialty tumor boards. The mean time to first response was 35 hours ( < 1 hour, 297 hours), median time was 20 hours, and 73% of postings had a response within 48 hours of original posting. The most robust tumor boards were breast, GI, and lung cancers. There was also a set of general posts that was nonspecific to patients including policy, COVID updates, and educational reviews. The average number of responses for tumor boards was significantly greater than general posts (3.5 vs. 1.8, p < 0.05). The number of views for both types of posts, however, were high (406 vs. 346, p < 0.05). Conclusions: An online communication platform is feasible and allows physicians to receive treatment suggestions for complex cases relatively quickly and across geographies. Tumor board cases received more interaction than policy and education updates. The platform lends itself to rapidly adding other aspects of cancer care such as COVID-19. Future applications include a network wide real-time molecular tumor board.

High-resolution imaging of the human incudostapedial joint using synchrotron-radiation phase-contrast imaging

The incudostapedial joint (ISJ) of the middle ear is important for proper transmission of sound energy to the cochlea. Recently, the biomechanics of the ISJ have been investigated using finite-element (FE) modelling, using simplified geometry. The objective of the present study was to investigate the feasibility of synchrotron-radiation phase-contrast imaging (SR-PCI) in visualising the ISJ ultrastructure. Three human cadaveric ISJs were dissected and scanned using SR-PCI at 0.9 µm isotropic voxel size. One of the samples was previously scanned at 9 µm voxel size. The images were visually compared and contrast-to-noise ratios (CNRs) were calculated (of both bone and soft tissues) for quantitative comparisons. The ISJ ultrastructure as well as adjacent bone and soft tissues were clearly visible in images with a 0.9 µm voxel size. The CNRs of the 0.9 µm images were relatively lower than those of the 9 µm scans, while the ratio of bone to soft tissue CNRs were higher, indicating better discernibility of bone from soft tissue in the 0.9 µm scans. This study was the first known attempt to image the ISJ ultrastructure using an SR-PCI scanner at submicron voxel size and results suggest that this method was successful. Future studies are needed to optimise the contrast and test the feasibility of imaging the ISJ in situ. LAY DESCRIPTION: The human middle ear consists of the eardrum, three small bones (the malleus, incus and stapes) and two joints connecting the bones (the incudostapedial joint and the incudomallear joint). The role of the middle ear is to amplify and transfer sound energy to the cochlea, the end organ of hearing. The incudostapedial joint (ISJ) of the middle ear is a synovial joint which is important for proper transmission of sound energy to the cochlea. Similar to other synovial joints it consists of meniscus, fluid and articulating surfaces. Recently, the biomechanics of the ISJ have been investigated using computational models, using grossly simplified geometry. Synchrotron radiation phase contrast imaging (SR-PCI) is a high-resolution imaging technique used to visualise small structures in three dimensions. The objective of the present study was to investigate the feasibility of using SR-PCI in visualising the ISJ ultrastructure. Three human cadaveric ISJs were dissected and scanned using SR-PCI at 0.9 µm isotropic voxel size. One of the samples was previously scanned at 9 µm voxel size. The images were both qualitatively and quantitatively compared. This study was the first known attempt to image the ISJ ultrastructure using an SR-PCI scanner at submicron voxel size and results suggest that this method was successful. Future studies are needed to optimise the contrast and feasibility of imaging the ISJ in situ.

Advances in research on the impacts of anti-submarine sonar on beaked whales

Mass stranding events (MSEs) of beaked whales (BWs) were extremely rare prior to the 1960s but increased markedly after the development of naval mid-frequency active sonar (MFAS). The temporal and spatial associations between atypical BW MSEs and naval exercises were first observed in the Canary Islands, Spain, in the mid-1980s. Further research on BWs stranded in association with naval exercises demonstrated pathological findings consistent with decompression sickness (DCS). A 2004 ban on MFASs around the Canary Islands successfully prevented additional BW MSEs in the region, but atypical MSEs have continued in other places of the world, especially in the Mediterranean Sea, with examined individuals showing DCS. A workshop held in Fuerteventura, Canary Islands, in September 2017 reviewed current knowledge on BW atypical MSEs associated with MFAS. Our review suggests that the effects of MFAS on BWs vary among individuals or populations, and predisposing factors may contribute to individual outcomes. Spatial management specific to BW habitat, such as the MFAS ban in the Canary Islands, has proven to be an effective mitigation tool and mitigation measures should be established in other areas taking into consideration known population-level information.

Institutionalising emergent organisation in health and social care

Purpose

The purpose of this paper is to argue for the institutionalisation of emergent forms of organisation in health and social care and offer a conceptual framework for this purpose.

Design/methodology/approach

Drawing on ethnographic research on the organising work of nurses and Translational Mobilisation Theory, this paper extends two classic Straussian sociological concepts – illness trajectory and articulation work – to conceptualise emergent organisation as Care Trajectory Management.

Findings

Failures of coordination are well-recognised threats to quality and safety and recent decades have witnessed an explosion of neoliberal technologies and governance arrangements designed to “measure and manage” these risks. Yet in a significant and growing proportion of health and social care provision successful service integration depends not on rational planning, but iterative negotiations and adjustments in response to contingencies. While ubiquitous in health and social care systems, these emergent forms of organisation lack legitimacy, the work involved is relatively invisible and practice is poorly served by prevailing management discourses.

Originality/value

The Care Trajectory Management Framework provides an alternative discourse and logic on which to develop strategies and technologies to support emergent organisational processes in acute and community care contexts.

B-50 Frequency of Sports-Related Concussion in Athletes with Neurodevelopmental Conditions

Objective

Research demonstrates that athletes with neurodevelopmental diagnoses may have a higher frequency of lifetime concussions (Iverson et al., 2016; Alosco, Fedor & Gunstad, 2014) possibly due to underlying attention, processing speed, or reaction time difficulties. The present study investigates concussion history and sports-related concussions between athletes with and without a history of neurodevelopmental disorders in a longitudinal, state-wide sample.

Method

Participants included 39,586 high school athletes (Mage = 15.18; 56.2% males) who were assessed pre and post-concussion with ImPACT between 2008 and 2016. There were 36,880 athletes (55.1% males) who did not report neurodevelopmental disorders and served as the control group and 2,706 athletes (71.4% males) in the clinical group who self-reported diagnosis of ADHD (55.6%), Learning Disability (LD;13.6%), Autism (3.2%), ADHD+LD (4.5%), and athletes in special education but no reported diagnosis (SpEd; 22%). Concussion frequency in each group was analyzed using chi-square analysis.

Results

Athletes were more likely to report prior concussions if they had a self-reported neurodevelopmental diagnosis (17%) compared to the control group (9%, χ2(1) = 112.11, p < .001). Odds ratios indicated that athletes with neurodevelopmental conditions were 1.43 times more likely to have a sports-related concussion.

Conclusions

Consistent with past research, results indicate that neurodevelopmental conditions are associated with greater lifetime risk of concussion, including sport-related concussions. Future studies may expand this research by examining underlaying causes of this increased risk in order to develop specific interventions to help reduce rates of concussion for this population.

B-55 Performance of ImPACT Validity Indices for Athletes with Neurodevelopmental Disorders

Objective

Research demonstrates neurodevelopmental diagnoses may increase likelihood of failing scores on ImPACT embedded validity indicators that flag questionable effort. New criteria have been proposed to enhance sensitivity of these indicators although their utility in athletes with neurodevelopmental diagnosis have not been thoroughly examined. This study investigates the effect of neurodevelopmental history on frequency of invalid performance on the standard and three proposed validity indicators.

Methods

Participants included 41,214 high school athletes (Mage = 15.1; 44.2% female; Meducation = 9.1) who completed baseline ImPACT testing. Athletes included these groups: ADHD (3.7%), Learning Disability (LD; 1.5%), Autism (0.2%), ADHD+LD (0.6%), Autism+ADHD/LD (0.1%), athletes with special education history but no diagnosis reported (SpEd; 2.8%), and healthy athletes (91.1%). Odds ratios were calculated to determine differences in invalid performance by both standard and proposed cutoffs.

Results

Neurodevelopmental disorder was associated with increased invalid performance using standard and proposed cutoffs with odds ratios ranging from 1.32 to 3.25. Invalid performance differed significantly across groups for both standard and two sets of proposed criteria (chi square p < .00001). For standard cutoffs, athletes with ADHD, LD, and ADHD/LD were significantly more likely than healthy athletes to have invalid performance. This pattern remained similar across the two sets of proposed criteria.

Conclusions

Results indicate increased incidence of invalid ImPACT performance based on standard and proposed validity indicators in athletes who self-report neurodevelopmental disorders. Findings indicate current and proposed cutoffs may not accurately capture low effort for neurodevelopmental populations. Future research should examine utility of separate cutoff criteria and expanded norms for athletes with neurodevelopmental history.

B-39 Is the Latent Structure of Neurocognitive Domains Invariant Across Males and Females with Schizophrenia?

Objective

Differences between males and females with schizophrenia have been identified for numerous important disorder-related variables including age of onset, severity, and course, among others. Evidence suggests there also may be differences in intellectual functioning and possibly specific cognitive deficits. This study examined differences in the latent structure of cognitive abilities between males and females with schizophrenia.

Method

Participants included 659 males (age X̄ = 38.25, 64.5% Caucasian, education X̄ = 11.69) and 209 females (age X̄ = 40.52, 55.5% Caucasian, education X̄ = 11.72) with schizophrenia who were evaluated with neuropsychological tests as part of a large multicenter randomized control trial of antipsychotic medications (CATIE). Confirmatory factor analysis (CFA) was used to test four competing models based on prior CFA of the CATIE data. Model accuracy was evaluated using Comparative Fit Index (CFI), Root Mean Squared Error of Approximation (RMSEA), and Akaike’s Information Criterion (AIC).

Results

CFAs were completed for each sex using EQS 6.3. Models included one-factor, five-factor, six-factor, and a hierarchical model in which five factors load on a single factor “g”. The six-factor model was the best fitting for both males and females.

Conclusions

The results indicated that a six-factor model of neurocognition is the best fitting model for both males and females. The results also suggest that the latent structure of cognitive abilities is similar for both sexes. This provides a strong basis for uniform interpretation of neuropsychological domains across males and females, although there may be sex-related differences in patterns and severity of deficit in each domain.

Comminuted, Articular Fractures of the Olecranon Process in Horses: 17 Cases (1980 to 1990)

Case records of 17 horses with a radiographic and surgical diagnosis of comminuted, articular fracture of the olecranon process of the ulna were retrieved using a computer-assisted search of hospital records entered between January 1, 1980 and October 31, 1990. The records were reviewed, and case management data summarized. Radiographic images were retrieved, and descriptions of the fractures recorded. Horses were classified as survivors if they were discharged from the hospital. Follow-up information was obtained by examination or phone conversation with the referring veterinarian, owner or trainer.

Twelve horses (71%) survived to be discharged from the hospital. Survivors were significantly younger and weighed less (mean age, 3.9 years; mean body weight 290.2 kg) than non-survivors (mean age, 9.1 years; mean body weight, 412.2 kg). Breed, gender, and duration of clinical signs prior to surgery were not significant to the outcome. Seven horses admitted with open wounds, and two horses suffered sepsis of the surgical site after internal fixation. Of these nine horses, four (44%) were discharged from the hospital. Patients with sepsis of the fracture site, because of open wounds or postoperative infection, had a significantly lower survival rate than horses in which asepsis of the fracture site was maintained.

Follow-up information was available for eight of 12 survivors (mean followup period, 2.6 years). Five (63%) horses were riding or “training sound” at the time of follow-up. Of five horses less than one year of age at the time of surgery, three (60%) were sound at a mean of 1.2 years after surgery. Of three horses four years or older, two (66%) were sound at follow-up 3.7 years after the operation.

Comminuted, articular fractures involving the olecranon process can be managed successfully in horses using a dynamic compression plate applied to the caudal aspect of the ulna. Also, application of a second plate on the lateral aspect of the ulna is possible, when fracture instability has been noted after application of the caudal plate. Age, weight, and sepsis of the fracture site were the most important prognostic indicators in this study.

Historical data, physical examination findings, surgical findings, clinical management data, and follow-up information are reported for 17 horses affected with comminuted, articular fracture of the olecranon process. Twelve (71%) horses survived to be discharged from the hospital. Survivors were significantly younger and of lighter body weight than non-survivors. Horses in which sepsis of the fracture site occurred had a significantly lower survival rate than horses in which aseptic fracture environment was maintained. Of eight horses available for follow-up information, five (63%) were riding or training sound at a mean of 2.6 years after surgery.

Comparison of Kaposi Sarcoma Risk in Human Immunodeficiency Virus-Positive Adults Across 5 Continents: A Multiregional Multicohort Study

BACKGROUND

We compared Kaposi sarcoma (KS) risk in adults who started antiretroviral therapy (ART) across the Asia-Pacific, South Africa, Europe, Latin, and North America.

METHODS

We included cohort data of human immunodeficiency virus (HIV)-positive adults who started ART after 1995 within the framework of 2 large collaborations of observational HIV cohorts. We present incidence rates and adjusted hazard ratios (aHRs).

RESULTS

We included 208140 patients from 57 countries. Over a period of 1066572 person-years, 2046 KS cases were diagnosed. KS incidence rates per 100000 person-years were 52 in the Asia-Pacific and ranged between 180 and 280 in the other regions. KS risk was 5 times higher in South African women (aHR, 4.56; 95% confidence intervals [CI], 2.73-7.62) than in their European counterparts, and 2 times higher in South African men (2.21; 1.34-3.63). In Europe, Latin, and North America KS risk was 6 times higher in men who have sex with men (aHR, 5.95; 95% CI, 5.09-6.96) than in women. Comparing patients with current CD4 cell counts ≥700 cells/µL with those whose counts were <50 cells/µL, the KS risk was halved in South Africa (aHR, 0.53; 95% CI, .17-1.63) but reduced by ≥95% in other regions.

CONCLUSIONS

Despite important ART-related declines in KS incidence, men and women in South Africa and men who have sex with men remain at increased KS risk, likely due to high human herpesvirus 8 coinfection rates. Early ART initiation and maintenance of high CD4 cell counts are essential to further reducing KS incidence worldwide, but additional measures might be needed, especially in Southern Africa.

Evaluation of critical congenital heart defects screening using pulse oximetry in the neonatal intensive care unit

OBJECTIVE

To evaluate the implementation of early screening for critical congenital heart defects (CCHDs) in the neonatal intensive care unit (NICU) and potential exclusion of sub-populations from universal screening.

STUDY DESIGN

Prospective evaluation of CCHD screening at multiple time intervals was conducted in 21 NICUs across five states (n=4556 infants).

RESULTS

Of the 4120 infants with complete screens, 92% did not have prenatal CHD diagnosis or echocardiography before screening, 72% were not receiving oxygen at 24 to 48 h and 56% were born ⩾2500 g. Thirty-seven infants failed screening (0.9%); none with an unsuspected CCHD. False positive rates were low for infants not receiving oxygen (0.5%) and those screened after weaning (0.6%), yet higher among infants born at <28 weeks (3.8%). Unnecessary echocardiograms were minimal (0.2%).

CONCLUSION

Given the majority of NICU infants were ⩾2500 g, not on oxygen and not preidentified for CCHD, systematic screening at 24 to 48 h may be of benefit for early detection of CCHD with minimal burden.