Impact of mediterranean diet promotion on environmental sustainability: a longitudinal analysis

OBJECTIVE

This article aims to estimate the differences in environmental impact (greenhouse gas [GHG] emissions, land use, energy used, acidification and potential eutrophication) after one year of promoting a Mediterranean diet (MD).

METHODS

Baseline and 1-year follow-up data from 5800 participants in the PREDIMED-Plus study were used. Each participant's food intake was estimated using validated semi-quantitative food frequency questionnaires, and the adherence to MD using the Dietary Score. The influence of diet on environmental impact was assessed through the EAT-Lancet Commission tables. The influence of diet on environmental impact was assessed through the EAT-Lancet Commission tables. The association between MD adherence and its environmental impact was calculated using adjusted multivariate linear regression models.

RESULTS

After one year of intervention, the kcal/day consumed was significantly reduced (-125,1 kcal/day), adherence to a MD pattern was improved (+0,9) and the environmental impact due to the diet was significantly reduced (GHG: -361 g/CO2-eq; Acidification:-11,5 g SO2-eq; Eutrophication:-4,7 g PO4-eq; Energy use:-842,7 kJ; and Land use:-2,2 m2). Higher adherence to MD (high vs. low) was significantly associated with lower environmental impact both at baseline and one year follow-up. Meat products had the greatest environmental impact in all the factors analysed, both at baseline and at one-year follow-up, in spite of the reduction observed in their consumption.

CONCLUSIONS

A program promoting a MD, after one year of intervention, significantly reduced the environmental impact in all the factors analysed. Meat products had the greatest environmental impact in all the dimensions analysed.

FNDC5/Irisin polymorphisms are associated with osteopenia in postmenopausal Mayan-Mestizo women

OBJECTIVE

This study aimed to analyze the association between rs3480 and rs16835198 of FNDC5/Irisin and their haplotypes with variations in bone mineral density (BMD) and osteopenia/osteoporosis in postmenopausal Mayan-Mestizo women.

METHODS

We studied 547 postmenopausal women of Maya-Mestizo origin. BMD was measured in the lumbar spine and total hip by dual-energy X-ray absorptiometry. DNA was obtained from blood leukocytes. rs3480 and rs16835198 of FNDC5/Irisin were studied using real-time PCR allelic discrimination. Differences between the means of BMD according to genotype were analyzed with covariance. Allele frequency differences were assessed by χ² and logistic regression was used to test for associations. Pairwise linkage disequilibrium between polymorphisms was calculated by direct correlation r², and haplotype analysis was conducted.

RESULTS

Under a recessive model, we observed a significant association of rs3480 with the presence of osteopenia at the total hip and femoral neck (p = 0.008 and p = 0.003, respectively). For rs16835198, we found an association with osteopenia at the total hip and femoral neck in a dominant model (p = 0.043 and p = 0.009, respectively).

CONCLUSIONS

We found an association of rs3480 with risk to present osteopenia at the total hip and femoral neck, while rs16835198 was associated as a protector for presence of osteopenia only at the femoral neck.

O-241 Elevated serum progesterone levels before frozen embryo transfer do not negatively impact reproductive outcomes: a large retrospective cohort study

Study question

Do patients with high serum progesterone levels before frozen embryo transfer (FET) under hormonal replacement therapy (HRT) present worse reproductive outcomes?

Summary answer

Elevated serum progesterone levels before FET in artificially prepared cycles with vaginal or vaginal plus subcutaneous progesterone do not impair reproductive outcomes.

What is known already

Low serum progesterone levels before FET do negatively affect reproductive outcomes in terms of live birth rate. However, there is not robust data regarding the impact of high serum progesterone levels in the luteal phase of patients who undergo HRT for FET.

Study design, size, duration

Retrospective cohort study of 3183 blastocyst FET cycles under HRT performed in a university-affiliated fertility centre between March 2009 and December 2020. All the cycles presented adequate serum progesterone levels before FET (≥10.6 ng/ml). A total of 1360 cycles corresponded to frozen homologous embryo transfer (ET) (hom-FET), 1024 were euploid ET (eu-FET) after preimplantational genetic testing for aneuploidies (PGT-A), and 799 cycles were frozen heterologous ET (het-FET). The primary objective was live birth rate (LBR).

Participants/materials, setting, methods

Standard HRT was used. Luteal phase was covered with vaginal progesterone 200 mg/8h, or vaginal plus a daily subcutaneous injection of progesterone (25 mg). Serum progesterone levels were measured the day before FET. Elevated progesterone levels were considered in the 90th and 95th centiles. A generalized additive model (GAM) was performed to study the functional relationships between progesterone and LBR. A multivariable logistic regression was used to evaluate the effect of high progesterone over LBR.

Main results and the role of chance

Mean serum progesterone level before FET was 16.77±8.43 ng/ml. Progesterone levels were significantly higher in the group under vaginal plus subcutaneous progesterone (21.87±14.17 vs. 15.56±5.72, p < 0.001). No differences in clinical pregnancy, miscarriage and LBR were found according to the use of vaginal or vaginal plus subcutaneous progesterone for each of the groups (hom-FET, eu-FET and het-FET). Live birth rates were comparable among patients in the highest centile of serum progesterone levels (≥p90, ≥22.33 ng/ml) and the rest of patients (p < 90) (43.9 vs 41.3%; p = 0.381). Patients with progesterone levels ≥p90 presented lower BMI compared to those in the lower centiles (<p90) (22.62±3.82 vs. 23.32±4.06; P = 0.009). After dividing patients in deciles according to serum progesterone levels before, no differences in LBR were observed among groups (P = 0.938). No association was observed with GAM model between progesterone levels and LBR. A multivariable logistic regression adjusted by oocyte age, type of treatment and number of embryos transferred was applied for centile 90 and centile 95 of progesterone, and showed that serum progesterone in their highest levels did not negatively impact LBR.

Limitations, reasons for caution

The main limitation of this study is its retrospective design. The results only apply for patients under HRT with vaginal micronized progesterone alone or plus subcutaneous progesterone. Progesterone determination was measured before blastocyst FET. Extrapolation to other HRT protocols or timings of progesterone measurement needs to be validated.

Wider implications of the findings

The results of this study suggest that once a threshold of serum progesterone before FET is achieved, progesterone levels are not predictive of the clinical outcome. Actually, LBR are not negatively affected when progesterone levels are found in their highest centiles after luteal phase rescue with vaginal plus subcutaneous progesterone.

Trial registration number

Not applicable

P-504 Quality of life and Sexual Dysfunction in Bologna poor ovarian responders (POR)

Study question

Is quality of life (QoL) and sexual function of poor ovarian responders affected by patients’ age and ovarian reserve?

Summary answer

QoL and sexual function in POR are only affected by infertility duration and number of previous IVF attempts; not by patients’ age and ovarian reserve.

What is known already

Diagnosis of infertility is a common cause of sexual health disorders. Couples undergoing Assisted Reproductive Technology (ART) can face emotional stress and feelings of inadequacy or guilt that may interfere in their quality life and sexual function, Poor ovarian responders may represent a group of patients with compromised sexual function and quality of life, owing to either their advanced age or the decline in the serum androgen levels observed in this population. Nonetheless, up to date evidence is scarce concerning clinical factors that may affect quality of life and sexual function of women with poor ovarian response.

Study design, size, duration

In a prospective study conducted between 2015 and 2021 we collected questionnaires from poor ovarian responders fulfilling the Bologna criteria concerning their quality of life and sexual function.

Participants/materials, setting, methods

Overall 70 women undergoing IVF treatment who fulfilled Bologna’s criteria for poor ovarian responders were interviewed at their first visit. Sexual distress was evaluated using the Female Sexual Distress Scale-Revised (FSDSR) and Quality of life was measured by a fertility questionnaire (FertiQOL). Bivariate statistical analysis was conducted in order to evaluate clinical factors (patients’ age, duration of infertility, previous IVF attempts and ovarian reserve) that could potentially negatively affect sexual distress and quality of life.

Main results and the role of chance

Patients’ mean age was 38.6 years old (with 20.6% of the patients being under 35, 33.8% between 35-39 and 45.6% were above 40 years). Infertility duration was less than a year for 22.1% of patients and over one year for 77.9% of patients. Most of patients (80.9%) had at least one previous IVF/ICSI treatment.

Quality of life and sexual function, as defined by FertiQol and FSDS-R scores, were comparable among different age groups, and older patients had similar QoL and sexual function with younger patients. Similarly, ovarian reserve did not affect any of the primary outcomes and no association has been found with AFC and FertiQol and FSDS-R scores.

The only variables affecting FertiQol and FSDS-R scores were the duration of infertility and the number of previous IVF attempts. Quality of life was significantly lower (75.4 vs 85.9, p < 0.001) among poor responders with previous IVF attempts (> or = 1), whereas sexual distress was higher (10.6 vs 2.54, p < 0.001) in women with previous IVF/ICSI treatment (>0 or = 1) and women with longer duration of infertility (>1 year vs ≤ 1 year) (10.2 vs 4.9, p = 0.049).

Limitations, reasons for caution

The results are only applicable to women who fulfil the Bologna criteria for poor ovarian response and cannot be generalized to all infertile women.

Wider implications of the findings

Low ovarian reserve and patients’ age have limited effect on quality of life and sexual distress of poor ovarian responders. Social and sexual concerns should be taken in consideration in Bologna poor responders, especially in those with longer duration of infertility and previous failed IVF attempts independent of their age.

Trial registration number

Not applicable

P-660 Polymorphisms in FSHR gene do not affect late follicular phase steroidogenic response in predicted normoresponders. Secondary analysis of a prospective multicenter cohort study

Study question

Does the presence of FSHR SNPs influence late follicular phase progesterone and estradiol serum levels in predicted normoresponders treated with rFSH?

Summary answer

The presence of FSHR SNPs (rs6165, rs6166, rs1394205) had no statistically significant impact on late follicular phase serum progesterone and estradiol levels.

What is known already

Previous studies have shown that late follicular phase serum progesterone and estradiol levels are significantly correlated with the magnitude of ovarian response. Several authors have proposed that individual variability in the response to ovarian stimulation could be explained by variants in FSHR. So far, the literature is scarce on the influence of this genetic variability on late follicular phase steroidogenic response. Our aim is to determine whether genetic variants in the FSHR gene could modulate late follicular phase serum progesterone and estradiol levels.

Study design, size, duration

We performed a secondary analysis of a multicenter multinational prospective study including 366 patients from Vietnam, Belgium and Spain (166 from Europe and 200 from Asia), conducted from 11/2016-06/2019. All patients underwent ovarian stimulation followed by oocyte retrieval in an antagonist protocol with a fixed daily dose of 150IU rFSH. All patients had a serum progesterone and estradiol measurement on the day of trigger and were genotyped for 3 FSHR SNPs (rs6165, rs6166, rs1394205).

Participants/materials, setting, methods

Patients included were predicted normal responder women <38 years old undergoing their first or second ovarian stimulation cycle. The prevalence of late follicular phase elevated serum progesterone (EP), as well as mean serum progesterone and estradiol levels on the day of trigger were compared between the different FSHR SNPs genotypes. EP was defined as > 1.5 ng/ml.

Main results and the role of chance

The overall prevalence of EP was 15.8% (n = 58). No significant difference was found in the prevalence of EP in Caucasian and Asian patients (17.5% vs. 14.5%). Genetic model analysis revealed a similar prevalence of EP in co-dominant, dominant and recessive models for variants FSHR rs6166, rs6165 and rs1394205. Also, no statistically significant difference was found in the mean serum progesterone levels in the three genetic models. Likewise, FSHR SNPs genotypes had no statistically significant impact in the mean late follicular phase serum estradiol levels

Limitations, reasons for caution

This study is a post-hoc analysis of a multicenter multinational prospective cohort study. The results must be interpreted with caution considering the sample size of the EP group. The fact that a fixed daily dose of 150 IU rFSH was used in this population precludes the generalization of the results.

Wider implications of the findings

Based on our results, FSHR SNPs rs6165, rs6166, rs1394205 do not influence late follicular phase serum progesterone nor estradiol levels in predicted normal responders. These findings add to the controversy in the literature regarding the impact of individual genetic susceptibility in response to ovarian stimulation in this population.

Trial registration number

not-applicable

P-008 Microgravity exposure significantly decreases sperm motility and vitality. Can we consider human reproduction outside the Earth?

Study question

Are fresh human sperm samples affected by different gravitational conditions than on Earth?

Summary answer

Motility and vitality of fresh human sperm samples are significantly decreased under microgravity conditions obtained by parabolic flight.

What is known already

Microgravity effects on the male reproductive system have mainly been studied in the animal model with diverse results and discouraging extrapolation in humans. While an increased motility was reported in bulls, mice models showed a decrease. Although preliminary data from the Micro-11 experiment presented by NASA reported human sperm alterations after microgravity exposure, our first study failed to show any significant effect of microgravity on “frozen” samples, suggesting that human sperm could be safely shipped outside the earth if important aspects related with cryopreservation were solved.

Study design, size, duration

Prospective study carried out in collaboration between the ART centre, a Technical University, and an Aviation Club specializing in parabolic flights.Two parabolic flights were conducted between 2020-2021, each consisting of 20 parabolic maneuvers, which means 160 seconds of microgravity exposure per sample. Fifteen sperm samples obtained from healthy men were included in the study in order to analyse the effects of microgravity and compare the results with those obtained in Earth gravity.

Participants/materials, setting, methods

Fresh sperm samples were checked pre-flight to evaluate vitality, concentration, motility and morphology. Samples were split into two to compare the effects of different gravity exposure: microgravity (flight) and Earth gravity (ground). After the flight, the same analysis were repeated, plus kinematics, DNA fragmentation by sperm chromatin dispersion, apoptosis by magnetic activated cell sorting, and oxidative stress by colorimetric test (Halosperm-Halotech). Computer Aided Semen Analysis (SCA-Scope) was used for cell counting.

Main results and the role of chance

On comparison of the mean values between fresh samples exposed to microgravity and those maintained on Earth gravity, statistical significant differences (p < 0,05) were found in the following parameters: vitality (69,7 ± 9,9 vs 72,4 ± 9,7 %), motile sperm concentration (23,7 ± 15,3 M/ml vs 31,5 ± 25,1 M/ml), grade “a” sperm concentration (8,7 ± 6,5 vs 11,7 ± 9,9 M/ml), percentage of spermatozoa with progressive motility (30 ± 12,9 vs 36 ± 14,3 %), curvilinear motility-VCL (45,7 ± 12,8 vs 47,7 ± 13,3 μm/s). Under the study conditions, non-statistically significant differences were observed in the other kinematic parameters: Lineal Velocity (VSL), Average Path Velocity (VAP), Straightness (STR), Amplitude of Lateral Head displacement (ALH), Linearity (LIN), Wobble (WOB), Beat-Cross Frequency (BCF), total sperm concentration (81,7 ± 112,1 vs 79,7 ± 89,8 M/ml), morphology (11,3 ± 6,3 vs 10,6 ± 5,3%), DNA fragmentation (14,6 ± 9,6 vs 15,7 ± 9,4), apoptosis (2,8 ± 2,8 vs 3,8 ± 4,4) and oxidative stress, since all samples maintained the same stress level in both splits.

Limitations, reasons for caution

Parabolic flight is an accepted ground-based method for obtaining microgravity conditions, but provides a short period of elapsed exposure to microgravity. Therefore, the results obtained need to be confirmed by using other platforms that provide a much longer time of exposure. More cases must be analysed to confirm the results.

Wider implications of the findings

Short exposure to microgravity significantly decreases sperm motility and vitality. Such an effect is likely to be stronger with longer exposure. These findings should be taken into account since this may eventually affect sperm fertilizing capacity and therefore natural conception or ART with fresh/frozen sperm, outside of the Earth.

Trial registration number

NCT03760783

P-662 Association between polymorphisms in FSHR and reproductive outcomes following IVF. Secondary analysis of a prospective cohort study in Europe and Asia

Study question

Does the presence of FSHR variants influence the clinical pregnancy rate (CPR), live birth rate (LBR) and cumulative live birth rate (CLBR) in predicted normoresponders?

Summary answer

The presence of at least one G allele in FSHR variant rs6165 is associated with higher CPR and LBR when compared to genotype AA.

What is known already

FSHR protein expression has been found in the placenta, umbilical cord, amnion and decidua, suggesting a role in the promotion of a healthy pregnancy. Previous reports have analysed the impact of FSHR SNP rs6166 in pregnancy outcomes with conflicting results, mainly due to the heterogeneity in the inclusion criteria and limited sample size. Moreover, the literature is scarce regarding the association between FSHR SNPs rs6165 and rs1394205 and reproductive outcomes. Our aim is to determine whether FSHR SNPs rs6166, rs6166 and rs1394205 influence the reproductive prognosis following IVF.

Study design, size, duration

We performed a secondary analysis of a multicenter multinational prospective study, including 368 patients from Vietnam, Belgium and Spain (168 from Europe and 200 from Asia) from 11/2016-06/2019. All patients underwent ovarian stimulation with fixed-dose 150IU rFSH in an antagonist protocol.

Participants/materials, setting, methods

Patients aged <38 years, undergoing their first or second IVF cycle with a predicted normal response (antral follicle count >9 and/or antimullerian hormone >1.1ng/ml) were included. CPR, LBR and miscarriage rate (MR) in the first embryo transfer, as well as CLBR, were compared between the different genotypes of FSHR SNPs rs6166, rs6165 and rs1394205.

Main results and the role of chance

A total of 351 patients performed at least one embryo transfer (ET). Enrolled patients had a mean age of 30.5 ± 3.63 years. Mean CPR and LBR in the first ET were 56.1% and 48.4%, respectively. Univariate genetic model analysis revealed a significantly higher CPR in the dominant model for variant rs6165 (46.3% (38/82) for genotype AA vs 59.1% (159/269) for genotypes AG/GG, p = 0.04). No statistically significant difference was found regarding the CPR for variants rs6166 nor rs1394205. Also, no statistically significant difference was found in univariate analysis regarding LBR nor MR for the different FSHR variants. However, multivariable logistic regression analysis adjusted for patient age, BMI, ethnicity, type of embryo transfer, embryo stage and number of top quality embryos transferred revealed a statistically significant higher CPR and LBR for FSHR variant rs6165 genotype GG (adjOR 2.50, 95% CI 1.30-4.81, and adjOR 1.96, 95%CI 1.02-3.78, respectively). No statistically significant differences were found regarding CLBR for FSHR variants rs6166, rs6165 nor rs1394205.

Limitations, reasons for caution

The young age of the included patients precludes the generalization of the results to older patients. Also, the results should be confirmed in larger cohorts before being extrapolated to the general population.

Wider implications of the findings

Our results demonstrate a previously unreported association between variant FSHR SNPs rs6165 genotype GG and higher CPR and LBR and reinforce a potential role for the genetic background in the prediction of a favorable prognosis following IVF.

Trial registration number

not-applicable

Explaining the complex impact of the Covid-19 pandemic on children with overweight and obesity: a comparative ecological analysis of parents' perceptions in three countries

BACKGROUND

The Covid-19 pandemic has changed children's eating and physical activity behaviours. These changes have been positive for some households and negative for others, revealing health inequalities that have ramifications for childhood obesity. This study investigates the pandemic's impact on families of children aged 2-6 years with overweight or obesity.

METHODS

Drawing on interviews conducted as part of a randomised controlled trial (RCT) for childhood obesity, thematic analysis was used to examine how parents of pre-schoolers perceived changes in their eating, screentime and physical activity behaviours between the first and second waves of Covid-19. Parents (n = 70, representing 68 families) were interviewed twice during a period of 6 months in three countries with markedly different pandemic policies - Sweden, Romania, and Spain. The analysis is informed by Bronfenbrenner's ecological systems theory, which embeds home- and school-based influences within societal and policy contexts.

RESULTS

The findings show that, although all participants were recruited from an RCT for families of children with excess weight, they reported different responses to the pandemic's second wave, with some children engaging in healthier eating and physical activity, and others engaging in comfort eating and a more sedentary lifestyle. Differences in children's obesity-related behaviours were closely related to differences in parents' practices, which were, in turn, linked to their emotional and social wellbeing. Notably, across all sites, parents' feeding and physical activity facilitation practices, as well as their emotional and social wellbeing, were embedded in household resilience. In resilient households, where parents had secure housing and employment, they were better able to adapt to the challenges posed by the pandemic, whereas parents who experienced household insecurity found it more difficult to cope.

CONCLUSIONS

As the Covid-19 pandemic is turning into a long-term public health challenge, studies that address household resilience are crucial for developing effective prevention and treatment responses to childhood obesity.

Potential use of ivermectin for the treatment and prophylaxis of SARS-CoV-2 infection

PURPOSE OF THE STUDY

Currently no treatment has been proven to be efficacious for patients with early symptoms of COVID-19. Although most patients present mild or moderate symptoms, up to 5-10% may have a poor disease progression, so there is an urgent need for effective drugs, which can be administered even before the onset of severe symptoms, i.e. when the course of the disease is modifiable. Recently, promising results of several studies on oral ivermectin have been published, which has prompted us to conduct the present review of the scientific literature.

METHODS

A narrative review has been carried out, focusing on the following four main topics: a) short-term efficacy in the treatment of the disease, b) long-term efficacy in the treatment of patients with post-acute symptoms of COVID-19, c) efficacy in the prophylaxis of the disease, and c) safety of ivermectin.

RESULTS

The reviewed literature suggests that there seems to be sufficient evidence about the safety of oral ivermectin, as well as the efficacy of the drug in the early-treatment and the prophylaxis of COVID-19.

CONCLUSIONS

In the view of the available evidence, the Frontline COVID-19 Critical Care Alliance (FLCCC) recommends the use of oral ivermectin for both prophylaxis and early-treatment of COVID-19. Further well-designed studies should be conducted in order to explore the efficacy and safety of invermectin at low and high doses, following different dosing schedules, in both, the short and long-term treatment.

Active Versus Passive Flow Control in UVC FILTERs for COVID-19 Containment

Ultraviolet radiation as a germicide is widely used in the health field and even in domestic hygiene. Here, we propose an improvement in low-cost portable units of filtration for indoor air, which is based on ultraviolet radiation. In the current technology, to carry out an air filtration with a suspension of aerosols in which there is a likely concentration of pathogens, whether viral, bacterial or molds, the air is forced to pass as close as possible to the ionizing radiation source (near field). Since the optical mass is very small, the desired effect can be achieved in a considerably short time, deactivating the infective potential of these biological agents. The proposal of this work is the regulation of the flow or speed control of passage through these filters by passive elements instead of by electronic control systems. For this, two devices have been designed, simulated, and built, obtaining similar net pathogen inactivation rates under different flow rates. The passive flow control device has demonstrated higher performance in terms of flow rate and lower cost of production since they do not require electronics and are produced with fewer diodes. This passive device has also shown a lower projection of maintenance cost, lower energy consumption rate (higher efficiency), and longer projection of useful life.

P–561 Male and female blastocyst: any difference other than the sex?

Study question

Is there any imbalance in the sex ratio (SR) and in the aneuploidy rate of male and female human blastocysts from a PGT-A programme?

Summary answer

Although SR in human blastocysts is significantly male-biased, more aneuploidies are observed among male blastocysts, resulting in comparable euploid male and female embryos available.

What is known already

More boys than girls are born worldwide, meaning that the SR at birth is biased towards males. Differences in the SR of children born after ART have been also reported. Factors such as the insemination technique or the day of embryo transfer have been shown to be related to the SR at birth, but whether the SR is shifted during the preimplantation and/or postimplantation development remains unknown. Study design, size, duration: Embryos from patients undergoing 921 PGT-A cycles from September 2017 to February 2020 were included in the study. Data from the chromosomal constitution of 2637 biopsied blastocysts was retrospectively analysed.

Participants/materials, setting, methods

Embryos were cultured in time-lapse incubators with low oxygen tension (5%) (Embryoscope®; Geri®) using single-step medium (Global®, LifeGlobal®; GTL™, Vitrolife). Blastocyst biopsy was performed between D5-D7 followed by immediate vitrification (Cryotop®, Kitazato). Trophectoderm samples were analysed by NGS. Embryos were categorized as euploid, aneuploid or mosaic. Embryos were called as mosaic when the deviation from the normal copy number was ≥30% and <70%.

Main results and the role of chance

Overall biopsies from 2637 blastocysts were analysed, 1320 on day 5 (50.1%), 1169 on day 6 (44.3%) and 148 on day 7 (5.6%). Sex distribution among the embryos analysed was skewed in favor of male sex with 1401 diagnosed as male (53.1%) and 1236 were female (46.9%), [OR (95%CI):1.13(1.05–1.22)]. As a consequence of this biased SR, more male embryos reached the blastocyst stage and were biopsied both on day 5/6 (708/1320, 53.6% on day 5 and 619/1169, 53% on day 6). Embryos biopsied on day 7 were balanced between sexes with 50% being male and 50% being female. Following biopsy and PGT-A, 1086 (41.2%) of the embryos were classified as euploid, 1349 (51.16%) as aneuploid, and 202 (7.7%) as mosaic embryos. More chromosomal anomalies were observed among male blastocysts when compared to the female ones, 738 (52.7%) vs 611 (49.4%). Similarly, mosaicism was more frequents in male as compared with female blastocysts, 123 (8.8%) vs 79 (6.4%). (P = 0.000). As more aneuploidies are observed among male blastocysts, the final number of available euploid blastocysts for embryo transfer was comparable between sexes (540 male/546 female), [OR (95%CI): 0.99 (0.87–1.11)].

Limitations, reasons for caution

This is a retrospective study. Only embryos at the blastocyst stage have been analyzed. Potential confounding factors such as sperm quality or the female age have not been analyzed. No data regarding the SR at birth have been analyzed in these study.

Wider implications of the findings: In our study, more male embryos develop to the blastocyst when compared to female ones. It can be hypothesized that female embryos can be more affected by an early arrest at cleavage stages. SR at birth would be expected to be similar as more aneuploidy is observed in male embryos.

Trial registration number

Not applicable

P–672 Higher pregnancy outcomes in patients undergoing embryo transfer-under hormonal replacement therapy where an individualised Progesterone supplementation was applied on the day of β-hCG

Study question

Does progesterone-supplementation (PS) from the day of β-hCG assessment improve pregnancy rates in embryo transfer-under hormonal replacement therapy (ET-HRT) in patient with Progesterone (P)<10.6 ng/mL?

Summary answer

Reduced P on the β-hCG day is associated with lower pregnancy-rates and higher miscarriage-rate. PS from the same day showed significant increase of reproductive outcomes.

What is known already

Up until now, in ART, very little has been done to understand whether the P intake should be personalized during the luteal phase. Most recent studies on the topic showed that low P levels on the day of ET-HRT or on the day before are associated with decreased pregnancy rates; however, when low P values are supplemented from the day before embryo-transfer (ET), similar results to cases with adequate P are reported. Nevertheless, little is known about the association between low P level, on the day of β-hCG (P- β-hCG) and PS from this day in ET-HRT, and pregnancy outcomes.

Study design, size, duration

This is a single centre, cohort, retrospective study conducted at a university-affiliated fertility centre between January 2018 and June 2020 where PS took place from the day of positive β-hCG determination when P < 10.6 ng/mL. In total 789 ET-HRT cycles were analysed of which 239 were performed in both fresh and frozen heterologous ET-HRT (het-ET), 336 in homologous ET-HRT (hom-FET) and 214 in euploid ET-HRT (eu-FET) after preimplantation genetic testing for aneuploidies IVF cycles (PGT-A).

Participants/materials, setting, methods

Women undergoing ET-HRT with normal P (>10.6ng/mL) on the day before ET were screened for P on the day of β-hCG. All women received vaginal P 200 mg/8 hours for the second part of HRT. PS was performed by adding P to the HRT when P- β-hCG was considered low (<10.6 ng/mL). Primary outcome: ongoing-pregnancy-rate (OPR); secondary outcome: miscarriage-rate (MR). Both were evaluated by considering PS on the day of β-hCG as a categorical variable.

Main results and the role of chance

Patients characteristics were comparable between groups (het-ET, hom-FET and eu-FET) although significantly lower body mass index was found when P- β-hCG>10.6 ng/mL compared to the subgroup with P- β-hCG<10.6 ng/mL and no PS (p = 0.012). Overall clinical pregnancy rate was 52.1% with no-significant differences between groups (48.5% in het-ET, 52.9% in hom-FET and 54.7% in eu-FET). P- β-hCG was considered as adequate in 75.7% (311/411) ET-HRT with positive β-hCG and low in 24.3% (100/411), with no differences between groups. In case of positive β-hCG and P- β-hCG >10.6 ng/mL, OPR was 83.6% and MR was 16.4%, with no-significant differences between groups. Among the 100 low P- β-hCG, 80 ET-HRT received PS. In this subgroup OPR was 96.2% and MR was 3.8%, with no-significant differences between groups. In 20 out of 100 ET with P- β-hCG <10.6 ng/mL, no PS was added for different reasons. This group showed the lowest OPR (30%) and the highest MR (70%), again with no between-group differences according to het-ET, hom-FET or eu-FET. Miscarriage rate was significantly higher (p < 0.001) when P- β-hCG was <10.6 ng/mL and no PS was added to HRT compared to P- β-hCG <10.6 ng/mL but with PS, and also compared to the P- β-hCG >10.6 ng/mL group.

Limitations, reasons for caution

The main limitation of the study is due to its retrospective nature and the small sample of patients with P- β-hCG<10.6 ng/mL that was not supplemented. Furthermore, the cut-off of P- β-hCG was arbitrarily decided upon previous studies, and lastly different routes of administration were considered for the PS.

Wider implications of the findings: The results of this study showed that individualization of Progesterone supplementation in ET-HRT may be a crucial turn point in order to increase the pregnancy rates and decrease the miscarriage rates. An adequate PS should be considered in case of low P- β-hCG levels for both het-ET, hom-FET and eu-FET.

Trial registration number

Not applicable

Retzius-sparing robot-assisted radical prostatectomy: Perioperative and immediate continence outcomes of an initial series

OBJECTIVE

The objective of this work is to present initial perioperative, immediate continence and oncological results in a series of 25 prostate cancer patients treated with Retzius-sparing robot-assisted radical prostatectomy.

MATERIAL AND METHODS

We retrospectively analyzed a series of 25 patients treated with Retzius-sparing robot-assisted radical prostatectomy for cT1-T2b prostate cancer between 2018-2019. The 5 stages of surgery are described. We make a descriptive statistic of our initial series and its outcomes in terms of immediate continence, defined as the use of 0 pad/diapers or 1 safety pad/diaper every 24 hours, one week after catheter removal.

RESULTS

Median follow-up, 6 months (3-18). Median PSA, 6.1 ng/ml (4-14.3). All surgeries were performed through a posterior intrafascial approach, and bilateral nerve-sparing was carried out in 84% of the cases. Affected surgical margins were present in 28%, being the apex the most frequent site of affectation. Surgical complications: 1 (4%) patient required transfusion of blood products in the immediate postoperative period. Mean hospital stay was 48 hours. Functional outcomes: 80% of the patients present immediate continence. 80% of continent patients do not require the use of any safety pads/diapers. Oncological outcomes: 84% are free of biochemical-progression in a median follow-up of 6 months.

CONCLUSIONS

Initial functional results in terms of immediate continence are very satisfactory in patients who have undergone Retzius-sparing robot-assisted radical prostatectomy without negative impact on prognosis.

Microgravity effects on frozen human sperm samples

PURPOSE

Microgravity has severe effects on cellular and molecular structures as well as on metabolic interactions. The aim of this study is to investigate the effects of microgravity (μg) exposure on human frozen sperm samples.

METHODS

Sibling samples from 15 normozoospermic healthy donors were frozen using glycerol as cryoprotectant and analyzed under microgravity and ground conditions. Microgravity was obtained by parabolic flights using a CAP10B plane. The plane executed 20 parabolic maneuvers with a mean of 8.5 s of microgravity for each parabola.

RESULTS

Frozen sperm samples preserved in cryostraws and stored in a secure and specific nitrogen vapor cryoshipper do not suffer significant alterations after μg exposure. Comparing the study group (μg) and the control group (1 g), similar results were obtained in the main parameters studied: sperm motility (M/ml) 13.72 ± 12.57 vs 13.03 ± 12.13 (- 0.69 95% CI [- 2.9; 1.52]), progressive a + b sperm motility (%) 21.83 ± 11.69 vs 22.54 ± 12.83 (0.03 95% CI [- 0.08; 0.15]), sperm vitality (%) 46.42 ± 10.81 vs 44.62 ± 9.34 (- 0.04 95% CI [- 0.13; 0.05]), morphologically normal spermatozoa (%) 7.03 ± 2.61 vs 8.09 ± 3.61 (0.12 95% CI [0.01; 0.24]), DNA sperm fragmentation by SCD (%) 13.33 ± 5.12 vs 13.88 ± 6.14 (0.03 95% CI [- 0.09; 0.16]), and apoptotic spermatozoa by MACS (%) 15.47 ± 15.04 vs 23.80 ± 23.63 (- 0.20 95% CI [- 0.66; 1.05]).

CONCLUSION

The lack of differences obtained between frozen samples exposed to μg and those maintained in ground conditions provides the possibility of considering the safe transport of human male gametes to space. Nevertheless, further research is needed to validate the results and to consider the possibility of creating a human sperm bank outside the Earth.

TRIAL REGISTRATION NUMBER

ClinicalTrials.gov: NCT03760783.

eLearning Technologies on the follow-up of Young People with Chronic Diseases

Introduction Non-communicable diseases are increasing worldwide due mainly to rapidly changing lifestyles and socio-economic status affecting the well-being and the lives of young people along their whole life. Hence, there is a need to provide adequate and useful measures to support patients living with those diseases in order to foster youth emotional and physical health and improve their daily life.

Objectives The aim of this presentation is to demonstrate the use of eLearning content to empower families, communities and young patients in dealing with the daily routine of chronic diseases.

Methodology Based on a human centred design, 176 youngsters with asthma, obesity, and diabetes aged between 3-16 years old were assessed to gather information about perceived needs and preferences in relation to disease management. Ineffective communication, lack of knowledge/skills, poor adherence to treatment and low acceptance of the disease were the main aspects highlighted. Based on those results, participants were fully involved participating in the iterative development of eLearning package to face these needs, gathering specific information about its content, design and usability.

Results The project has generated eLearning modules, using Articulate technologies, providing practical information and learning content in three languages, in partnership with health research centres, hospitals and patient associations in Portugal, Spain and France. There are lots of packages: obesity, respiratory diseases and diabetes. In each of these, the content is provided using gamification strategies and role models. eLearning is one of the components of the follow up process, being complemented by a mobile application with an interactive support chat and fun games.

Conclusion ELearning tools, along with other online tools, contribute to generate a more positive perspective on the control of the disease and to support families and patients to get reliable information and connect with medical assistance.

Effects of hypothyroidism on the mesenteric and omental adipose tissue in rats

To characterize the influence of hypothyroidism on the endocrine activity of mesenteric and omental adipose tissue (MOAT) and the peripheral regulation of energy balance (EB) in rats, we analyzed food intake (FI); basal metabolic rate (BMR); locomotor activity; body weight (BW); serum hormone concentrations and the expression of their receptors in MOAT. We evaluated the morphology and differentiation of adipocytes. Hypothyroidism decreased FI, BMR and BW. The percentage of visceral white adipose tissue (WAT) depots and the morphology of adipocytes were similar to euthyroid rats. Serum leptin and adiponectin expression in MOAT were altered by hypothyroidism. The expression of Perilipin 1, HSL, UCP1 and PRDM16 was significantly lower in MOAT of hypothyroid animals. Hypothyroidism in rats leads to a compensated EB by inducing a white adipocyte dysfunction and a decrease in BW, BMR, FI and adipokine secretions without changing the percentage of WAT depots and the morphology of the MOAT.

Radiological study to evaluate the spreading of two volumes (10 vs. 20ml) of radiological contrast in the block of cutaneous branches of intercostal nerves in medial axillary line (BRILMA) in a porcine experimental model

OBJECTIVE

Interfascial blocks of the thoracic wall are being developed as an alternative to central blocks in breast surgery. However, there are few studies that have evaluated the anatomical extension of the local anaesthetic. The objective of this study was to analyse, using fluoroscopy, the spreading of two volumes (10 vs. 20ml) of radiological contrast in the serratus-intercostal plane block in an experimental pig model.

MATERIAL AND METHODS

Ten Large-White breed pigs were selected to have a bilateral ultrasound serratus-intercostal plane block performed, with the administering of 10ml and 20ml of iopamidol in the right and left hemithorax, respectively. The spreading of contrast was analysed by fluoroscopy. The Spearman test correlation was used to evaluate the relationship between the administered volume and radiological spreading. A value of P<.05 was considered significant.

RESULTS

Twenty anaesthetic blocks were performed, being able to analyse 18 of them. The administration of 10ml of contrast was associated with a mean spreading of 2.28±0.31 (95% CI; 2.01-2.54) intercostal spaces, while the administration of 20ml showed a spreading of 3±0.25 (95% CI; 2.81-3.18) intercostal spaces. There was a significant correlation between the injected volume and the spreading of the contrast (Spearman correlation coefficient of 0.81; P=.0001).

CONCLUSION

The results showed a spreading of volume subject to the serratus-intercostal plane block, although not maintaining a 1:1 ratio. Doubling the volume increased the blocked segments by 31%. These findings, if corroborated in the clinical practice, would allow a more precise adjustment in the anaesthetic volume administered.

<b>Contrasting human perceptions of and attitudes towards two threatened small carnivores, <I>Lycalopex fulvipes</I> and <I>Leopardus guigna</I>, in rural communities adjacent to protected areas in Chile</b>

The interaction between humans and small carnivores is a phenomenon especially frequent in rural fringes, as is the case of communities surrounding natural areas.  In Chile, two species of threatened carnivores, the Darwin’s Fox and the Guigna, have increased their contact with humans due to human-induced changes in their habitat. The objective of this study was to characterize the interactions of these species with humans by assessing human perceptions and attitudes toward them, and to assess livestock and poultry ownership and management practices in local communities to evaluate their possible roles in the phenomenon.  We conducted semi-structured interviews in rural communities adjacent to natural protected areas of two different regions in southern Chile.  We found that people have a more positive perception of Darwin’s Foxes than Guignas, but both species are considered damaging due to poultry attacks.  Livestock and poultry management was generally deficient. Improvements in animal management and education programs could lead to a significant decrease in negative interactions.  

Neurotizaciones Sensitivas en Cirugía de la Mano

La lesión de los nervios mediano y cubital puede ocasionar daños permanentes y tiene consecuencias devastadoras. Los accidentes con instrumentos cortantes en ambiente laboral o doméstico y las lesiones del plexo braquial, constituyen las causas más frecuentes. En los casos de lesión del nervio mediano, recuperar la sensibilidad de la “pinza” (borde cubital del pulgar y radial del índice), es esencial para la reeducación de la función motora e incluso, puede considerarse un requisito previo. Asimismo, la lesión del nervio cubital, conlleva a déficit de sensibilidad del borde medial de la mano y produce falta de soporte para la manipulación con la pinza. En ambos casos, la mano está expuesta a traumatismos, heridas, quemaduras, etc. En el momento de la lesión y siempre que sea posible, debe realizarse una reparación primaria del nervio. Las avulsiones, las lesiones proximales y los grandes defectos nerviosos, obligan a una reconstrucción secundaria cuando el paciente se ha recuperado de la lesión aguda. Este estudio objetiva una actualización de la literatura.

Removal of Escherichia coli and Enterococcus faecalis after Hand Washing with Antimicrobial and Nonantimicrobial Soap and Persistence of These Bacteria in Rinsates

Food handlers are important sources of contamination in the agricultural environment. This study was conducted (i) to evaluate the activity of antimicrobial soaps against Escherichia coli and Enterococcus faecalis using a hand washing model with soiled hands and (ii) to determine the survival and persistence of these bacteria in rinsates. Sterilized agricultural soil from tomato and pepper farms was inoculated with E. coli or E. faecalis at 10³ or 10⁶ CFU/g. Decontaminated hands were placed in contact with contaminated soil for 2 min and were then washed with soaps with or without antimicrobial compounds (citric extracts, chloroxylenol, triclosan, or chlorhexidine gluconate). As the control, hands were washed with sterile distilled water. The levels of bacteria remaining on the hands and recovered from the rinsates were determined using a membrane filtration method and selective media. Antimicrobial soaps removed levels of E. coli similar to those removed by distilled water and nonantimicrobial soap on hands contaminated with E. coli at 10³ CFU/g. However, when hands were contaminated with E. coli at 10⁶ CFU/g, more E. coli was removed with the chlorhexidine gluconate soap. When hands were contaminated with E. faecalis at 10³ CFU/g, bacteria were removed more effectively with soaps containing chloroxylenol or chlorhexidine gluconate. When hands were contaminated with E. faecalis at 10⁶ CFU/g, all of the antimicrobial soaps were more effective for removing the bacteria than were distilled water and nonantimicrobial soap. E. coli grew in all of the hand washing rinsates except that containing triclosan, whereas E. faecalis from the 10⁶ CFU/g treatments grew in rinsates containing chlorhexidine gluconate and in the distilled water rinsates. Washing with antimicrobial soap was more effective for reducing bacteria on soiled hands than was washing with water or nonantimicrobial soap. However, persistence or growth of bacteria in these rinsates poses health risks.

The rs3857059 variant of the SNCA gene is associated with Parkinson's disease in Mexican Mestizos

Among the candidate genes for Parkinson's disease (PD), SNCA has replicated association in different populations. Besides other known mutations in the SNCA gene, the rs3857059 variant has also been linked to various neurodegenerative disorders. Therefore, the aim of the present study was to search for association of this variant and sporadic PD in Mexican Mestizo patients. A case-control study was performed including 241 individuals, 106 patients, and 135 healthy controls. Genotyping was performed using real-time PCR. The rs3857059 variant demonstrated an association with PD in Mexican Mestizos (OR = 2.40, CI, 1.1 to 5.1, p = 0.02) under the recessive model. In addition, a gender effect was found for the GG genotype in females (OR = 1.31, CI, 1.01 to 1.7, p = 0.037). This is the first study to confirm an association of the rs3857059 variant with PD and also to show a gender effect. Our data contribute to the elucidation of the link between rs3857059 and susceptibility to PD observed in the Mexican Mestizo population.

[Prevalence of human papillomavirus in Spanish women from a population screening program]

OBJECTIVE

The human papillomavirus (HPV), is necessary to cause a woman developing cervical cancer. The aim of the study was to estimate the prevalence of women with HPV infection, covered by the program of prevention and early detection of cervical cancer of Castile and León (Spain).

METHODS

Samples of women included in the screening program were analyzed. Including a total of 120,326 cervical swab samples, collected in the period from January 2012 to December 2014.

RESULTS

12,183 HPV positive samples were detected, representing a prevalence of 9.6 ‰, (IC 95% 9.5%-9.8%) in the female population. High-risk HPV were found in higher proportion that HPV low-risk genotypes. HPV prevalence correlates inversely with women age. Coinfections of multiple genotypes were found in one third of screened women population.

CONCLUSIONS

Data showed in this study are the first and wider Spanish results from a cervical cancer screening program population non opportunistic based on HPV detection. These results would serve as a reference for future prevalence studies and to evaluate the future impact of HPV vaccination campaigns.

CommuniMents

Social media has revolutionized human communication and styles of interaction. Due to its effectiveness and ease, people have started using it increasingly to share and exchange information, carry out discussions on various events, and express their opinions. Various communities may have diverse sentiments about events and it is an interesting research problem to understand the sentiments of a particular community for a specific event. In this article, the authors propose a framework CommuniMents which enables us to identify the members of a community and measure the sentiments of the community for a particular event. CommuniMents uses automated snowball sampling to identify the members of a community, then fetches their published contents (specifically tweets), pre-processes the contents and measures the sentiments of the community. The authors perform qualitative and quantitative evaluation for a variety of real world events to validate the effectiveness of the proposed framework.

Outcomes After Direct Thrombectomy or Combined Intravenous and Endovascular Treatment Are Not Different

Background and Purpose—

Whether intravenous thrombolysis adds a further benefit when given before endovascular thrombectomy (EVT) is unknown. Furthermore, intravenous thrombolysis delays time to groin puncture, mainly among drip and ship patients.

Methods—

Using region-wide registry data, we selected cases that received direct EVT or combined intravenous thrombolysis+EVT for anterior circulation strokes between January 2011 and October 2015. Treatment effect was estimated by stratification on a propensity score. The average odds ratios for the association of treatment with good outcome and death at 3 months and symptomatic bleedings at 24 hours were calculated with the Mantel–Haenszel test statistic.

Results—

We included 599 direct EVT patients and 567 patients with combined treatment. Stratification through propensity score achieved balance of baseline characteristics across treatment groups. There was no association between treatment modality and good outcome (odds ratio, 0.97; 95% confidence interval, 0.74–1.27), death (odds ratio, 1.07; 95% confidence interval, 0.74–1.54), or symptomatic bleedings (odds ratio, 0.56; 95% confidence interval, 0.25–1.27).

Conclusions—

This observational study suggests that outcomes after direct EVT or combined intravenous thrombolysis+EVT are not different. If confirmed by a randomized controlled trial, it may have a significant impact on organization of stroke systems of care.

Access to Endovascular Treatment in Remote Areas

Background and Purpose—

Since demonstration of the benefit of endovascular treatment (EVT) in acute ischemic stroke patients with proximal arterial occlusion, stroke care systems need to be reorganized to deliver EVT in a timely and equitable way. We analyzed differences in the access to EVT by geographical areas in Catalonia, a territory with a highly decentralized stroke model.

Methods—

We studied 965 patients treated with EVT from a prospective multicenter population-based registry of stroke patients treated with reperfusion therapies in Catalonia, Spain (SONIIA). Three different areas were defined: (A) health areas primarily covered by Comprehensive Stroke Centers, (B) areas primarily covered by local stroke centers located less than hour away from a Comprehensive Stroke Center, and (C) areas primarily covered by local stroke centers located more than hour away from a Comprehensive Stroke Center. We compared the number of EVT×100 000 inhabitants/year and time from stroke onset to groin puncture between groups.

Results—

Baseline characteristics were similar between groups. Throughout the study period, there were significant differences in the population rates of EVT across geographical areas. EVT rates by 100 000 in 2015 were 10.5 in A area, 3.7 in B, and 2.7 in C. Time from symptom onset to groin puncture was 82 minutes longer in group B (312 minutes [245–435]) and 120 minutes longer in group C (350 minutes [284–408]) compared with group A (230 minutes [160–407]; P <0.001).

Conclusions—

Accessibility to EVT from remote areas is hampered by lower rate and longer time to treatment compared with areas covered directly by Comprehensive Stroke Centers.

Evolution of inflammatory dysregulation and oxidative stress in patients with first episode of mania

Introduction

Recent studies have focused on the imbalance in inflammatory and antioxidant pathways as possible causes of the underlying neurodegenerative processes in bipolar disorder. Thus, the study of these pathways in first episodes of mania (FEM) can increase knowledge about this issue.

Aim

To compare plasma concentrations of pro-inflammatory (MCP-1, PGE2, TNFα) and oxidative parameters (TAS, NO2 and TBARS) between controls and FEM patients and to analyze the evolution of these parameters in patients from baseline to 6 months assessment time.

Methods

This study included 44 FEM patients and 79 healthy controls, aged 18 to 40. Blood samples were available for controls at baseline and for patients at baseline and 6 months after. TAS and TBARS were measured using non-EIA assay kits, N02 was measured with Griess method and PGE2, MCP-1 and TNFα with ELISA kits.

Results

At baseline, TAS was significantly lower in patients than in controls and TBARS, MCP-1 and TNFα were significantly higher in patients. Among patients, TAS and MCP1 were lower at 6 months than at the illness onset and PGE2 and NO2 were significantly higher than at baseline.

Conclusion

Patients presented an increased oxidative damage and also a higher activation of pro-inflammatory pathways than healthy controls at baseline. After 6 months their level of oxidative stress continue increased. Pro-inflammatory parameters decreased overtime (MCP-1 and TNF α) but PGE2, increased surprisingly. This can be due to the fact that antipsychotics are not able to completely reverse baseline inflammation.

Disclosure of interest

The authors have not supplied their declaration of competing interest.

Generation of stable orthogonal gradients of chemical concentration and substrate stiffness in a microfluidic device

Cellular responses to chemical cues are at the core of a myriad of fundamental biological processes ranging from embryonic development to cancer metastasis. Most of these biological processes are also influenced by mechanical cues such as the stiffness of the extracellular matrix. How a biological function is influenced by a synergy between chemical concentration and extracellular matrix stiffness is largely unknown, however, because no current strategy enables the integration of both types of cues in a single experiment. Here we present a robust microfluidic device that generates a stable, linear and diffusive chemical gradient over a biocompatible hydrogel with a well-defined stiffness gradient. Device fabrication relies on patterned PSA (Pressure Sensitive Adhesive) stacks that can be implemented with minimal cost and lab equipment. This technique is suitable for long-term observation of cell migration and application of traction force microscopy. We validate our device by testing MDCK cell scattering in response to perpendicular gradients of hepatocyte growth factor (HGF) and substrate stiffness.

[Screening with angiographic images prior to (99m)Tc-HMPAO labelled leukocyte scintigraphy in the diagnosis of periprosthetic infection]

AIM

To evaluate the impact of the angioscintigrapy of the three phase bone scan as screening method to rule out infection of the hip and knee prosthesis prior to performing the (99m)Tc-HMPAO leukocyte scintigraphy.

MATERIAL AND METHODS

A total of 120 (70 women, 50 men; mean age 71±11years) with clinical suspicion of hip (n=63) or knee (n=57) infection of the prosthesis and clinical suspicion of infection were evaluated prospectively. All patients underwent three-phase bone scan (angioscintigraphy, vascular and bone phase) and (99m)Tc-HMPAO-labelled white blood cell scintigraphy. Final diagnosis of infection was made by microbiological documentation or clinical follow-up for at least 12months.

RESULTS

Eighteen out of 120 patients were diagnosed of infection of hip prosthesis (n=10) or knee prosthesis (n=8). The angioscintigraphy was positive in 15/18 infected cases and in 21/102 of the non-infected cases with a sensitivity of 83%, specificity of 79% and negative predictive value of 97%. Sensitivity and specificity of (99m)Tc-HMPAO leukocyte scintigraphy were 72% and 95%, respectively. If the leukocyte labeled scintigraphies had been used exclusively for patients with positive angioscintigraphy, this would have saved up to 70% of the (99m)Tc-HMPAO leukocyte scintigraphies performed. There were no cases of infection with positive labeled leukocyte scintigraphy and negative angioscintigraphy.

CONCLUSION

Angioscintigraphy (blood flow phase of bone scan) is a useful technique for screening for hip and knee joint prosthesis infection, significantly reducing the need for (99m)Tc-HMPAO leukocyte scintigraphy without affecting the sensitivity of the technique.

[Analysis of the failures of a cemented constrained liner model in patients with a high dislocation risk]

OBJECTIVE

To evaluate the short-term results of an ultra high molecular weight polyethylene retentive cup in patients at high risk of dislocation, either primary or revision surgery.

MATERIAL AND METHOD

Retrospective review of 38 cases in order to determine the rate of survival and failure analysis of a constrained cemented cup, with a mean follow-up of 27 months. We studied demographic data, complications, especially re-dislocations of the prosthesis and, also the likely causes of system failure analyzed.

RESULTS

In 21.05% (8 cases) were primary surgery and 78.95% were revision surgery (30 cases). The overall survival rate by Kaplan-Meier method was 70.7 months. During follow-up 3 patients died due to causes unrelated to surgery and 2 infections occurred. 12 hips had at least two previous surgeries done. It wasn't any case of aseptic loosening. Four patients presented dislocation, all with a 22 mm head (P=.008). Our statistical analysis didn't found relationship between the abduction cup angle and implant failure (P=.22).

CONCLUSIONS

The ultra high molecular weight polyethylene retentive cup evaluated in this series has provided satisfactory short-term results in hip arthroplasty patients at high risk of dislocation.