The Effect of Positive Pressure Ventilation on Acute Kidney Injury in COVID-19 Patients with Acute Respiratory Distress Syndrome: An Observational Study.

INTRODUCTION: Acute kidney injury (AKI) is frequent in critically ill COVID-19 patients and is associated with a higher mortality risk. By increasing intrathoracic pressure, positive pressure ventilation (PPV) may reduce renal perfusion pressure by reducing venous return to the heart or by increasing renal venous congestion. This study's aim was to evaluate the association between AKI and haemodynamic and ventilatory parameters in COVID-19 patients with ARDS. METHODS: This is a single-centre retrospective observational study. Consecutive patients diagnosed with COVID-19 who met ARDS criteria and required invasive mechanical ventilation were enrolled. The relationship between respiratory and haemodynamic parameters influenced by PPV and AKI development was evaluated. AKI was defined according to KDIGO criteria. AKI recovery was evaluated a month after ICU admission and patients were classified as "recovered," if serum creatinine (sCr) value returned to baseline, or as having "acute kidney disease" (AKD), if criteria for AKI stage 1 or greater persisted. The 6-month all-cause mortality was collected. RESULTS: A total of 144 patients were included in the analysis. AKI occurred in 69 (48%) patients and 26 (18%) required renal replacement therapy. In a multivariate logistic regression analysis, sex, hypertension, cumulative dose of furosemide, fluid balance, and plateau pressure were independently associated with AKI. Mortality at 6 months was 50% in the AKI group and 32% in the non-AKI group (p = 0.03). Among 36 patients who developed AKI and were discharged alive from the hospital, 56% had a full renal recovery after a month, while 14%, 6%, and 14% were classified as having an AKD of stage 0, 2, and 3, respectively. CONCLUSIONS: In our cohort, AKI was independently associated with multiple variables, including high plateau pressure, suggesting a possible role of PPV on AKI development. Further studies are needed to clarify the role of mechanical ventilation on renal function.

Exploring gender impact on collaborative care planning: insights from a community mental health service study in Italy.

INTRODUCTION: Personal recovery is associated with socio-demographic and clinical factors, and gender seems to influence the recovery process. This study aimed to investigate: i) differences in the recovery goals of men and women users of a community mental health service in Italy; ii) any differences by gender in recovery over six months using the Mental Health Recovery Star (MHRS). METHODS: Service users and staff completed the MHRS together at recruitment and six months later to agree the recovery goals they wished to focus on. Socio-demographic and clinical characteristics and ratings of symptoms (BPRS), needs (CAN), functioning (FPS), and functional autonomy (MPR) were collected at recruitment and six months follow-up. Comparisons between men and women were made using t-tests. RESULTS: Ten women and 15 men completed the MHRS with 19 mental health professionals. Other than gender, men and women had similar socio-demographic, and clinical characteristics at recruitment. Women tended to choose recovery goals that focused on relationships whereas men tended to focus on work related goals. At follow-up, both men and women showed improvement in their recovery (MHRS) and women were less likely to focus on relationship related goals, perhaps because some had found romantic partners. There were also gains for both men and women in engagement with work related activities. Ratings of functional autonomy (MPR) improved for both men and women, and men also showed improvement in symptoms (BPRS) and functioning (FPS). CONCLUSIONS: Our findings suggest that collaborative care planning tools such as the MHRS can assist in identifying individualized recovery goals for men and women with severe mental health problems as part of their rehabilitation.

Supported employment for people with severe mental illness: a pilot study of an Italian social enterprise with a special ingredient.

BACKGROUND: People with mental disorders are far more likely to be unemployed than the general population. Two internationally recognized, evidence-based models of interventions for employment for people with severe mental health problems are Individual Placement Support and the Clubhouse. In Italy, a common model is the 'social enterprise' (SE), which is a programme run by non-profit organisations that help individuals with disabilities to be employed. Despite SEs spread and relevance in Italy, there are no studies about Italian samples. This paper reports on a pilot evaluation of psychosocial and work outcomes of a SE based in Verona, Italy. The study aims to investigate if people with SMI involved in SE job placements may achieve personal recovery and better outcomes over time, and in comparison with a comparable group of users. METHODS: This is a pilot descriptive study with three components. A longitudinal design that comprised a functioning description of 33 SE members with a psychiatric disability in two time-points (when they joined the SE-on average 5 years before the study recruitment, and at the study recruitment-year 2018); and a repeated collection of job details of the 33 members in three time points: 2 years before the recruitment,-year 2016; 1 year before the recruitment - year 2017; and at the recruitment-year 2018. An assessment at the recruitment time-year 2018, of SE users' satisfaction with the job placement, symptoms, functioning, and quality of life (QoL). A cross-sectional study that compared the 33 SE members at the recruitment time-year 2018, with a matched group of people with the following criteria: living in local supported accommodations, being unemployed and not SE members. The two groups were compared on ratings of psychopathology, functioning, and QoL. Descriptive analyses were done. RESULTS: At the recruitment time - year 2018, all SE participants showed a significant better functioning (p < 0.001) than when they joined the SE-when they had been employed for an average of 5 years. In comparison to the matched group, SE members had significantly better functioning (p = 0.001), psychopathology (p = 0.007), and QoL (p = 0.034). According to their SE membership status, participants comprised trainees (21.2%) and employee members (78.8%). Trainees compared to employees had lower autonomies, functioning, QoL and more severe psychopathology. Over the two years prior to study recruitment, trainees showed stable poor autonomies, while employee members showed a variation from average autonomies in the 2 years before the recruitment time - year 2016, to good ones at the recruitment time - year 2018. Over the two years, all SE members set increasing numbers of objectives in all three domains. All SE participants reported high levels of satisfaction with all aspects of the job placement. CONCLUSIONS: SE that provides tailored support to assist people to gain employment skills may be an effective component in helping recovery from SMI.

Quality of residential facilities in Italy: satisfaction and quality of life of residents with schizophrenia spectrum disorders.

BACKGROUND: Recovery and human rights promotion for people with Schizophrenia Spectrum Disorders (SSDs) is fundamental to provide good care in Residential Facilities (RFs). However, there is a concern about rehabilitation ethos in RFs. This study aimed to investigate the care quality of Italian RFs, the quality of life (QoL) and care experience of residents with SSD. METHODS: Fourty-eight RFs were assessed using a quality assessment tool (QuIRC-SA) and 161 residents with SSD were enrolled. Seventeen RFs provided high intensity rehabilitation (SRP1), 15 medium intensity (SRP2), and 16 medium-low level support (SRP3). Staff-rated tools measured psychiatric symptoms and psychosocial functioning; user-rated tools assessed QoL and satisfaction with services. RFs comparisons were made using ANOVA and Chi-squared. RESULTS: Over two-thirds patients (41.5 y.o., SD 9.7) were male. Seventy-six were recruited from SRP1 services, 48 from SRP2, and 27 from SRP3. The lowest QuIRC-SA scoring was Recovery Based Practice (45.8%), and the highest was promotion of Human Rights (58.4%). SRP2 had the lowest QuIRC-SA ratings and SRP3 the highest. Residents had similar psychopathology (p = 0.140) and functioning (p = 0.537). SRP3 residents were more employed (18.9%) than SRP1 (7.9%) or SRP2 (2.2%) ones, and had less severe negative symptoms (p = 0.016) and better QoL (p = 0.020) than SRP2 residents. There were no differences in the RF therapeutic milieu and their satisfaction with care. CONCLUSIONS: Residents of the lowest supported RFs in Italy had less severe negative symptoms, better QoL and more employment than others. The lowest ratings for Recovery Based Practice across all RFs suggest more work is needed to improve recovery.

Performance and effectiveness of step progressive care pathways within mental health supported accommodation services in Italy.

BACKGROUND: In Italy, a growing number of people with severe mental illness (SMI) require care in residential facilities (RFs), a key component of the care pathway. However, despite their development, studies about resident samples have been very few. AIMS: This study, the VALERE-REC Study (eVALuation of outcomE in Residential-use of clinical data with REsearch objeCtives) aims to identify the characteristics that increase the probability to move patients living in RFs to a more independent setting. METHODS: A survey involved 167 patients hosted in 25 RFs of the Verona Mental Health Department. Forty-five patients were residents (27%) in Comunità Terapeutico Riabilitativa Protetta (CTRP); 56 (34%) in Comunità Alloggio (CA), 14 (8%) in Gruppo Appartamento Protetto (GAP), 52 (31%) in Comunità Alloggio Estensiva (CAE). They were assessed for their care pathway after 30-months. The Quality Indicators for Rehabilitative Care-Supported Accommodation (QuIRC-SA) evaluated the quality of 19/25 (76%) RFs. Descriptive analyses were done. RESULTS: According to the mission stated by the Veneto Region guidelines, RFs hosted patients with different needs and clinical profiles. The mean stay was longer than expected, most patients were unemployed, unmet needs were related to self-management and patient's social contacts, and recovery-oriented practices were not implemented. CONCLUSIONS: Despite the appropriate admission of patients in different RFs considering their psychopathology, functioning, and needs, the progressive step care pathway did not result effectively pursued. To improve the effectiveness of residential interventions a major task should be to focus on the acquisition of the necessary skills to live independently.

Mental health supported accommodation services in England and in Italy: a comparison.

PURPOSE: England and Italy are considered pioneers in the development of community mental health services. Both have implemented supported accommodation services for those with more complex needs, which can be broadly categorized into three main types with similar specification. The aim of this study was to compare the characteristics of these services and their users in England and Italy. METHODS: Data from two cross-sectional surveys of supported accommodation services undertaken across England and in Verona, Italy (England-619 service users from 87 services; Verona-167 service users from 25 services) were compared. RESULTS: Service users in the two samples had similar socio-demographic and clinical characteristics; most were male, unmarried and unemployed, with a primary diagnosis of schizophrenia or other psychosis and over 15 years contact with mental health services. Supported accommodation occupancy was high in both samples. The actual length of stay was greater than the expected length of stay for all three service types but overall turnover was similar between countries (p = 0.070). Across services, total needs and quality of life were higher for Italian compared to English service users (p < 0.001 for both) but, unmet needs were lower amongst English service users (p < 0.001). Around 40% in both samples moved to more independent accommodation successfully within 30 months. CONCLUSIONS: England and Italy have similar mental health supported accommodation pathways to assist those with more complex needs to gain skills for community living, but individuals tend to require longer than expected at each stage.

Right in Comparison to Left Cerebral Hemisphere Damage by Stroke Induces Poorer Muscular Responses to Stance Perturbation Regardless of Visual Information.

OBJECTIVE: Fast and scaled muscular activation is required to recover body balance following an external perturbation. An issue open to investigation is the extent to which the cerebral hemisphere lesioned by stroke leads to asymmetric deficits in postural reactive responses. In this experiment, we aimed to compare muscular responses to unanticipated stance perturbations between individuals who suffered unilateral stroke either to the right or to the left cerebral hemisphere. METHODS: Stance perturbations were produced by releasing a load attached to the participant's trunk, inducing fast forward body oscillation. Electromyography was recorded from the gastrocnemius medialis and biceps femoris muscles. Muscular activation from age-matched healthy individuals was taken as reference. RESULTS: Analysis indicated that damage to the right hemisphere induced delayed activation onset, and lower rate and magnitude of activation of the proximal and distal muscles of the paretic leg. Those deficits were associated with stronger activation of the nonparetic leg. Comparisons between left hemisphere damage and controls showed deficits limited to activation of the biceps femoris of the paretic leg. Manipulation of visual information led to no significant effects on muscular responses. CONCLUSIONS: These results suggest that right cerebral hemisphere damage by stroke leads to more severe deficits in the generation of reactive muscular responses to stance perturbation than damage to the left cerebral hemisphere regardless of visual information.

Cellulite: A Surgical Treatment Approach.

BACKGROUND: Cellulite is one of the most common skin and subcutaneous tissue conditions, affecting predominantly the thighs and hips in postadolescent women. Its etiology is not well defined, and multiple available treatments show variable efficacy. OBJECTIVES: To describe a technique for treatment of cellulite of the gluteal region, thighs, and hips through superficial liposuction utilizing a special cannula, combined with subcutaneous autologous fat grafting. METHODS: A retrospective review was performed of patients treated over 26 years at the Hospital São Lucas, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil. Patients underwent pretreatment evaluation as to the extent of their cellulite, and pretreatment and posttreatment photographs were obtained for visual evaluation of the results. RESULTS: Procedures were performed on 126 patients: 121 (96%) women and 5 (4%) men. The majority considered their results good or excellent. The complication rate was low, with the most common complications being ecchymosis, contour irregularities, partial recurrence of cellulite, seroma, and numbness. CONCLUSIONS: We describe an effective method for the treatment of cellulite. Whereas subcision techniques utilize a needle or microblade to cut fibrous septa, we utilize a special cannula; larger areas can be treated than with subcision. Fat grafting is utilized to correct depressions and improve skin quality, which are added benefits compared to traditional subcision. Considering the multiple available cellulite treatments and their limitations, and the high patient satisfaction rate we achieved, with a low recurrence and complication rate, this technique can be a safe and effective option for patients with cellulite.

Light touch modulates balance recovery following perturbation: from fast response to stance restabilization.

Light fingertip touch of a static bar generates extra somatosensory information used by the postural control system to reduce body sway. While the effect of light touch has been studied in quiet stance, less attention has been given to its potential benefit for reactive postural responses. In the present study, we tested the effect of light fingertip touch of a stable surface on recovery of postural stability from a mechanical perturbation. Participants stood upright on a force plate touching a static rigid bar while being pulled backward by a load. Unpredictable release of the load induced fast anterior body sway, requiring a reactive response to recover balance. Effect of light touch on postural responses was assessed as a function of vision and malleability of the support surface, analyzing different epochs ranging from the pre-perturbation period to recovery of a relatively stable quiet stance. Results showed that light touch induced lower magnitude of muscular activation in all epochs. Center of pressure (CoP) displacement/sway was affected by interaction of light touch with manipulation of the other sensory information. For the periods associated with quiet stance, light touch led to decreased CoP sway in the malleable surface in the pre-perturbation epoch, and in the condition combining no vision and malleable surface in the balance restabilization and follow-up quiet stance epochs. For the fast reactive response epoch, light touch induced smaller amplitude of CoP displacement across conditions, and lower CoP maximum velocity in the condition combining no vision and rigid surface. These results showed that light touch modulates postural responses in all epochs associated with an unanticipated mechanical perturbation, with a more noticeable effect in conditions manipulating sensory information relevant for balance control.

Addressing Challenges in Residential Facilities: Promoting Human Rights and Recovery While Pursuing Functional Autonomy.

Objective: Italian residential facilities (RFs) aim to promote human rights and recovery for individuals with severe mental disorders. Italian RFs can be distinguished into five main types: high-intensity rehabilitation (RF1), medium-intensity rehabilitation (RF2), medium-level support (RF3.1), high-level support (RF3.2), low-level support (RF3.3). This study aimed to assess the effectiveness of Italian RFs in achieving functional autonomy while upholding human rights and recovery. Methods: Data on socio-demographics, clinical information, patient and staff assessments of functional autonomy, types of interventions, and RF performance in various domains were collected in a pilot study with a cross-sectional design. Descriptive and inferential analyses were conducted. Results: Twelve RFs and 113 patients participated, with varying proportions in each RF type. RF1 patients were the oldest (p < 0.001) with the lowest functional autonomy (p < 0.001), while RF2 patients were the youngest (p < 0.001) with the lowest hospitalization rate (p < 0.001). RF3.1 patients had the highest employment rate (p = 0.024), while RF3.2 had the lowest employment rate (p = 0.024) and the longest service contact (p < 0.001). RF3.3 users had the highest functional autonomy (p < 0.001). The highest functional autonomy was in self-care which received the highest focus in objectives and interventions. Patients rated their functional autonomy higher than professionals (p < 0.001). RFs excelled in the "human rights" and "social interface" domains but performed poorly in "recovery-based practice," with RF1 having the lowest performance and RF3.3 the highest. Conclusions: This pilot study suggests that Italian RFs generally aligne with their mission and human rights principles, but personalizing interventions and implementing recovery-oriented practices face challenges.

Positivity, daily time use, mood, and functioning in patients with schizophrenia spectrum disorders: Results from the diapason multicentric study.

BACKGROUND: Positivity (POS) indicates the proclivity to see life and experiences in a positive light. There is limited research on its effects on individuals with Schizophrenia Spectrum Disorders (SSD). Very little is known about the relationship between POS and daily activities in people with SSD. AIM: The study aims to compare the POS rated by patients with SSD with those obtained in an Italian normative sample matched by age and sex and to use the Ecological Momentary Assessment (EMA) to investigate the association between POS and daily time use (i.e. productive activities, leisure activities), functioning and mood in individuals with SSD. METHOD: 620 SSD patients were recruited from mental health services in Italy as part of the DiAPAson project. POS, symptom severity, functioning, and quality of life (QoL) were assessed. POS scores were compared to a normative sample of 5,002 Italian citizens. Additionally, a subset of 102 patients underwent 7-day assessments using mobile EMA. RESULTS: People with SSD did not significantly differ from the Italian normative sample in POS levels (0.035, p = .190). POS showed a significant inverse association with support network (-0.586, p = .036) and symptomatology (BPRS -0.101; 95% p < .001; BNSS B = -0.113, p < .001). A significant direct association was found between POS and QoL (B = 0.310, p < .001) and functioning (B = 0.058, p < .001). In the subsample using EMA, POS ratings showed significant associations with Positive Emotions (B = 0.167, p < .001) and Negative Emotions (B = -0.201, p < .001). CONCLUSION: People with SSD exhibited comparable levels of POS to the normative sample. Higher POS was linked to better functioning, QoL, fewer severe symptoms, and increased positive emotions. However, it did not relate to increased productivity or engagement in leisure activities. Further research is needed to understand the relationship between POS and time use in individuals with SSD.

Medical comorbidities in bipolar disorder (BIPCOM): clinical validation of risk factors and biomarkers to improve prevention and treatment. Study protocol.

BACKGROUND: BIPCOM aims to (1) identify medical comorbidities in people with bipolar disorder (BD); (2) examine risk factors and clinical profiles of Medical Comorbidities (MC) in this clinical group, with a special focus on Metabolic Syndrome (MetS); (3) develop a Clinical Support Tool (CST) for the personalized management of BD and medical comorbidities. METHODS: The BIPCOM project aims to investigate MC, specifically MetS, in individuals with BD using various approaches. Initially, prevalence rates, characteristics, genetic and non-genetic risk factors, and the natural progression of MetS among individuals with BD will be assessed by analysing Nordic registers, biobanks, and existing patient datasets from 11 European recruiting centres across 5 countries. Subsequently, a clinical study involving 400 participants from these sites will be conducted to examine the clinical profiles and incidence of specific MetS risk factors over 1 year. Baseline assessments, 1-year follow-ups, biomarker analyses, and physical activity measurements with wearable biosensors, and focus groups will be performed. Using this comprehensive data, a CST will be developed to enhance the prevention, early detection, and personalized treatment of MC in BD, by incorporating clinical, biological, sex and genetic information. This protocol will highlight the study's methodology. DISCUSSION: BIPCOM's data collection will pave the way for tailored treatment and prevention approaches for individuals with BD. This approach has the potential to generate significant healthcare savings by preventing complications, hospitalizations, and emergency visits related to comorbidities and cardiovascular risks in BD. BIPCOM's data collection will enhance BD patient care through personalized strategies, resulting in improved quality of life and reduced costly interventions. The findings of the study will contribute to a better understanding of the relationship between medical comorbidities and BD, enabling accurate prediction and effective management of MetS and cardiovascular diseases. TRIAL REGISTRATION: ISRCTN68010602 at https://www.isrctn.com/ISRCTN68010602 . Registration date: 18/04/2023.

Patterns of antipsychotic prescription and accelerometer-based physical activity levels in people with schizophrenia spectrum disorders: a multicenter, prospective study.

Antipsychotic polypharmacy (APP) in patients with schizophrenia spectrum disorders (SSDs) is usually not recommended, though it is very common in clinical practice. Both APP and SSDs have been linked to worse health outcomes and decreased levels of physical activity, which in turn is an important risk factor for cardiovascular diseases and premature mortality. This real-world, observational study aimed to investigate antipsychotic prescribing patterns and physical activity in residential patients and outpatients with SSDs. A total of 620 patients and 114 healthy controls were recruited in 37 centers across Italy. Each participant underwent a comprehensive sociodemographic and clinical evaluation. Physical activity was monitored for seven consecutive days through accelerometer-based biosensors. High rates of APP were found in all patients, with residential patients receiving more APP than outpatients, probably because of greater psychopathological severity. Physical activity was lower in patients compared to controls. However, patients on APP showed trends of reduced sedentariness and higher levels of light physical activity than those in monopharmacy. Rehabilitation efforts in psychiatric residential treatment facilities were likely to result in improved physical activity performances in residential patients. Our findings may have important public health implications, as they indicate the importance of reducing APP and encouraging physical activity.

Needs for care of residents with schizophrenia spectrum disorders and association with daily activities and mood monitored with experience sampling method: the DIAPASON study.

AIMS: Care needs represent an essential paradigm in planning residential facility (RF) interventions. However, possible disagreements between users and staff are critical issues in service delivery. The Experience Sampling Method (ESM) tracks experiences in the real world and real time. This study aimed to evaluate the care needs of patients with schizophrenia spectrum disorder (SSD) in RFs and its association with daily activities and mood monitored using the ESM. METHODS: As part of the DIAPASON project, 313 residents with SSD were recruited from 99 Italian RFs. Sociodemographic and clinical characteristics were recorded. Care needs, the severity of symptomatology and negative symptoms were assessed. Fifty-six residents were also assessed for 7 consecutive days using the mobile ESM. Descriptive, agreement, predictor and moderator analyses were conducted. RESULTS: The staff rated a higher number of total and met needs than service users (p < 0.001). Only a slight agreement between users and staff on unmet needs was found in self-care (k = 0.106) and information (k = 0.100) needs, while a moderate agreement was found in accommodation (k = 0.484), food (k = 0.406), childcare (k = 0.530), physical health (k = 0.470), telephone (k = 0.458) and transport (k = 0.425) needs. Older age (-0.15; p < 0.01), longer SSD diagnosis (-0.16; p < 0.01), higher collaboration (-0.16; p < 0.01) and lower symptomatology (-0.16; p < 0.01) decreased the number of unmet needs, while being a female (0.27; p < 0.05) and a shorter length of stay in an RF (0.54; p < 0.001) increased the number of unmet needs. A higher number of unmet needs was associated with a lower amount of time spent in leisure activities or reporting a positive mood: on the contrary, more unmet needs were associated with a greater amount of time spent in religious or non-productive activities. The associations between unmet needs rated by staff and users and momentary mood as assessed using the ESM were not moderated by the severity of symptomatology. CONCLUSIONS: Although care needs are fundamental in planning residential activities aimed at recovery-oriented rehabilitation, RF interventions did not fully meet users' needs, and some disagreements on unmet needs between users and staff were reported. Further efforts are necessary to overcome Italian RF limits in delivering rehabilitative interventions defined by real users' needs to facilitate users' productivity and progress towards personal recovery.

[Psychometric properties of the Monitoring of the Path of Rehabilitation (MPR) Form.] / Proprietà psicometriche della Scheda di Monitoraggio del Percorso Riabilitativo (MPR).

PURPOSE: The correct placement of people with mental disorders in psychiatric residential facilities (PRF) and the monitoring of their progress in these facilities is a critical issue that has not been fully settled in the Italian system. To overcome this problem, some validated instruments are used, which mostly assess the patient's functioning/disability, while no instruments have been set up to assess functional autonomy in patients with a psychiatric disorder residents in RFs. The Verona Department of Mental Health has created the Monitoring of the Path of Rehabilitation (MPR) Form with the aim of assessing the functional autonomy of patients to admit and monitor them adequately in their residential pathways. The aim of this study is to test the main psychometric properties of the MPR Form. METHODS: The study of the psychometric properties of the MPR Form consisted of three steps: an evaluation conducted more than 15 days apart by two independent evaluators on 18 clinical cases to investigate the test-retest reliability; a test of the 18 clinical cases by the two evaluators to measure the inter-rater rieliability; a measure of convergent validity using the Personal and Social Functioning Scale. Eight professionals completed a satisfaction questionnaire regarding the acceptability of the MPR Form. Inter-rater and test-retest analyses were conducted using intraclass correlation coefficients. Convergent validity was investigated using Kendall's tau-b rank correlation coefficient and acceptability using a frequency analysis. RESULTS: Inter-rater and test-retest reliability were good, as well for concurrent validity and acceptability. CONCLUSIONS: The data presented in this article demonstrate that it is possible to measure the functional autonomy of patients in Italian SRPs using the MPR Form.

The impact of ventilation-perfusion inequality in COVID-19: a computational model.

COVID-19 infection may lead to acute respiratory distress syndrome (CARDS) where severe gas exchange derangements may be associated, at least in the early stages, only with minor pulmonary infiltrates. This may suggest that the shunt associated to the gasless lung parenchyma is not sufficient to explain CARDS hypoxemia. We designed an algorithm (VentriQlar), based on the same conceptual grounds described by J.B. West in 1969. We set 498 ventilation-perfusion (VA/Q) compartments and, after calculating their blood composition (PO2, PCO2, and pH), we randomly chose 106 combinations of five parameters controlling a bimodal distribution of blood flow. The solutions were accepted if the predicted PaO2 and PaCO2 were within 10% of the patient's values. We assumed that the shunt fraction equaled the fraction of non-aerated lung tissue at the CT quantitative analysis. Five critically-ill patients later deceased were studied. The PaO2/FiO2 was 91.1 ± 18.6 mmHg and PaCO2 69.0 ± 16.1 mmHg. Cardiac output was 9.58 ± 0.99 L/min. The fraction of non-aerated tissue was 0.33 ± 0.06. The model showed that a large fraction of the blood flow was likely distributed in regions with very low VA/Q (Qmean = 0.06 ± 0.02) and a smaller fraction in regions with moderately high VA/Q. Overall LogSD, Q was 1.66 ± 0.14, suggestive of high VA/Q inequality. Our data suggest that shunt alone cannot completely account for the observed hypoxemia and a significant VA/Q inequality must be present in COVID-19. The high cardiac output and the extensive microthrombosis later found in the autopsy further support the hypothesis of a pathological perfusion of non/poorly ventilated lung tissue.NEW & NOTEWORTHY Hypothesizing that the non-aerated lung fraction as evaluated by the quantitative analysis of the lung computed tomography (CT) equals shunt (VA/Q = 0), we used a computational approach to estimate the magnitude of the ventilation-perfusion inequality in severe COVID-19. The results show that a severe hyperperfusion of poorly ventilated lung region is likely the cause of the observed hypoxemia. The extensive microthrombosis or abnormal vasodilation of the pulmonary circulation may represent the pathophysiological mechanism of such VA/Q distribution.

Light touch leads to increased stability in quiet and perturbed balance: Equivalent effects between post-stroke and healthy older individuals.

Cerebral damage provoked by stroke may lead to deficits of quiet balance control and of the recovery of body equilibrium following an unanticipated postural perturbation. In this investigation we aimed to evaluate the effect of light touch (LT) of an earth-fixed surface on balance stability in individuals with post-stroke hemiparesis, taking performance of age-matched healthy participants as reference. Evaluations were made in conditions of full and no visual information. Analysis of quiet balance showed that LT induced higher balance stability, with reduced amplitude and velocity of postural sway. Evaluation of the effect of LT on automatic postural responses was made in the task of recovering body equilibrium following a mechanical perturbation of balance leading to fast forward body sway. Results showed that LT led to reduced amplitude of center of mass displacement following the perturbation, in addition to reduced amplitude and velocity of center of pressure under the feet, and lower activation of the lower legs muscles. Those effects of LT were observed in both the post-stroke and control groups, and did not interact with vision availability. Our results indicated then that individuals who suffered a cerebral stroke can stabilize perturbed and non-perturbed postural responses by lightly touching a stable surface to a similar extent of healthy older individuals.