Impact of vacuum-assisted venous drainage on forward flow in simulated pediatric cardiopulmonary bypass circuits utilizing a centrifugal arterial pump head

Abstract Objective: To analyze the impact of vacuum-assisted venous drainage (VAVD) on arterial pump flow in a simulated pediatric cardiopulmonary bypass circuit utilizing a centrifugal pump (CP) with an external arterial filter. Methods: The simulation circuit consisted of a Quadrox-I Pediatric oxygenator, a Rotaflow CP (Maquet Cardiopulmonary AG, Rastatt, Germany), and a custom pediatric tubing set primed with Lactated Ringer's solution and packed red blood cells. Venous line pressure, reservoir pressure, and arterial flow were measured with VAVD turned off to record baseline values. Four other conditions were tested with progressively higher vacuum pressures (-20, -40, -60, and -80 mmHg) applied to the baseline cardiotomy pressure. An arterial filter was placed into the circuit and arterial flow was measured with the purge line in both open and closed positions. These trials were repeated at set arterial flow rates of 1500, 2000, and 2500 mL/min. Results: The use of progressively higher vacuum caused a reduction in effective arterial flow from 1490±0.00 to 590±0.00, from 2020±0.01 to 1220±0.00, and from 2490±0.0 to 1830±0.01 mL/min. Effective forward flow decreased with increased levels of VAVD. Conclusion: The use of VAVD reduces arterial flow when a CP is used as the main arterial pump. The reduction in the forward arterial flow increases as the vacuum level increases. The loss of forward flow is further reduced when the arterial filter purge line is kept in the recommended open position. An independent flow probe is essential to monitor pump flow during cardiopulmonary bypass.

O quesito raça/cor nos estudos de caracterização de usuários de Centro de Atenção Psicossocial / The race/color variable in studies of characterization of the users of Psychosocial Care Centers

Resumo Este trabalho teve como objetivo apresentar, por meio de revisão narrativa da literatura científica, o perfil dos usuários atendidos em Centros de Atenção Psicossocial (CAPS), para verificar a inclusão do quesito raça/cor nessa produção. O levantamento bibliográfico foi realizado de maio a agosto de 2015 no Google Acadêmico e em bases que compõem a Biblioteca Virtual de Saúde: Medline, BDENF, Paho, Index Psicologia e Lilacs. As estratégias de busca foram: (1) "mental health services"/"serviços de saúde mental" AND "epidemiological profile"/"perfil epidemiológico" e (2) "mental health services"/"serviços de saúde mental" AND "health profile"/"perfil de saúde". Dois revisores avaliaram títulos e resumos dos 452 artigos recuperados. A partir disso, foram excluídos os artigos repetidos e os que não tratam do perfil de usuários de CAPS, restando então 17 artigos. Desses, apenas três apresentaram dados de raça/cor, mas nenhum discutiu esses dados. Verificou-se que dois CAPS têm proporcionalmente mais negros em tratamento do que a população em geral, e evidenciou-se que o uso da variável raça/cor para caracterizar usuários dos serviços de CAPS ainda é reduzido, mesmo que seja importante marcador de cunho social - isso vai ao encontro da maneira como as desigualdades raciais no Brasil são tratadas pela sociedade: como inexistentes, o que reforça as iniquidades. Essas desigualdades têm se revelado persistentes e requerem que a política de saúde mental e a academia iniciem discussão que vá além de recomendações de conferências, para que se definam estratégias para esse enfrentamento e se produzam e reproduzam conhecimentos que possam ajudar na elaboração e implementação dessas estratégias.

Abstract Based on the review of the scientific literature, this study aims to present the profile of the users who attend Psychosocial Care Centers (PCCs) to verify if the race/color factor is considered in it. We carried out the bibliographic research between May and August 2015 on Scholar Google and on the Virtual Health Library databases: Medline, BDENF, Paho, Index Psicologia and Lilacs. Our search strategies were: (1) "mental health services"/"serviços de saúde mental" AND "epidemiological profile"/"perfil epidemiológico" and (2) "mental health services"/"serviços de saúde mental" AND "health profile"/"perfil de saúde". Two reviewers assessed the titles and abstracts of 452 articles retrieved. Thus, we deleted the repeated articles and those that did not meet the profile of PCCs users, remaining 17 of them. From these, only three articles had data on race/color, but none of them developed a discussion on this information. We found out that two PCCs proportionally have more black patients compared with any other population and that the use of race/color to characterize users of PCCs services is still not so common, despite being considered an important social marker - this is how the Brazilian society deals with racial inequalities: as they were not real, which contributes to their strengthening. These inequalities have shown to be persistent, making it necessary for academics and public health managers to go beyond the recommendations of the conferences and define strategies to face such issues, thus producing and reproducing helpful knowledge in its developing and implementation of these measures.