Mobilização passiva precoce aumenta a resposta de reatividade vascular em pacientes graves com sepse: um estudo quase-experimental / Early passive mobilization increases vascular reactivity response in critical patients with sepsis: a quasi-experimental study

RESUMO Objetivo: Investigar a influência de uma sessão de mobilização passiva na função endotelial de pacientes com sepse. Métodos: Este foi um estudo quase-experimental duplo-cego e de braço único com desenho pré e pós-intervenção. Participaram 25 pacientes com diagnóstico de sepse hospitalizados em unidade de terapia intensiva. Avaliou-se a função endotelial basal (pré-intervenção) e imediatamente pós-intervenção por meio de ultrassonografia da artéria braquial. Foram obtidas a dilatação mediada pelo fluxo, a velocidade pico de fluxo sanguíneo e a taxa de cisalhamento pico. A mobilização passiva consistiu na mobilização bilateral (tornozelos, joelhos, quadris, pulsos, cotovelos e ombros), com três séries de dez repetições cada, totalizando 15 minutos. Resultados: Após a mobilização, encontramos aumento da função de reatividade vascular em relação à pré-intervenção: dilatação mediada pelo fluxo absoluta (0,57mm ± 0,22 versus 0,17mm ± 0,31; p < 0,001) e dilatação mediada pelo fluxo relativa (17,1% ± 8,25 versus 5,08% ± 9,16; p < 0,001). O pico de fluxo sanguíneo na hiperemia (71,8cm/s ± 29,3 versus 95,3cm/s ± 32,2; p < 0,001) e a taxa de cisalhamento (211s ± 113 versus 288s ± 144; p < 0,001) também aumentaram. Conclusão: Uma sessão de mobilização passiva foi capaz de aumentar a função endotelial em pacientes graves com sepse. Estudos futuros são necessários para investigar se um programa de mobilização pode ser aplicado como intervenção benéfica para melhorar clinicamente a função endotelial em pacientes hospitalizados por sepse.

ABSTRACT Objective: To investigate the influence of a passive mobilization session on endothelial function in patients with sepsis. Methods: This was a quasi-experimental double-blind and single-arm study with a pre- and postintervention design. Twenty-five patients with a diagnosis of sepsis who were hospitalized in the intensive care unit were included. Endothelial function was assessed at baseline (preintervention) and immediately postintervention by brachial artery ultrasonography. Flow mediated dilatation, peak blood flow velocity and peak shear rate were obtained. Passive mobilization consisted of bilateral mobilization (ankles, knees, hips, wrists, elbows and shoulders), with three sets of ten repetitions each, totaling 15 minutes. Results: After mobilization, we found increased vascular reactivity function compared to preintervention: absolute flow-mediated dilatation (0.57mm ± 0.22 versus 0.17mm ± 0.31; p < 0.001) and relative flow-mediated dilatation (17.1% ± 8.25 versus 5.08% ± 9.16; p < 0.001). Reactive hyperemia peak flow (71.8cm/s ± 29.3 versus 95.3cm/s ± 32.2; p < 0.001) and shear rate (211s ± 113 versus 288s ± 144; p < 0.001) were also increased. Conclusion: A passive mobilization session increases endothelial function in critical patients with sepsis. Future studies should investigate whether a mobilization program can be applied as a beneficial intervention for clinical improvement of endothelial function in patients hospitalized due to sepsis.

Patterns of vascular response immediately after passive mobilization in patients with sepsis: an observational transversal study.

Sepsis is a serious organ dysfunction leading to endothelial damage in critical patients. Physiologically, there is an augment of vascular diameter in response to increased vascular blood flow and shear stress stimulus. However, the pattern of vascular response in face of passive mobilization (PM), an early mobilization physical strategy, has not yet been explored in patients with sepsis. To explore patterns of vascular response to PM and associations with clinical and cardiovascular profile in patients with sepsis. Cross-sectional, single-arm study. Thirty-two patients diagnosed with sepsis were enrolled. Vascular response was assessed by flow-mediated dilation (FMD) using brachial artery ultrasound, before and after PM. The PM (to assess the response pattern) and SR (shear rate) were also calculated. PM protocol consisted of knees, hips, wrists, elbows, shoulders, dorsiflexion/plantar flexion movements 3 × 10 repetitions each (15 min). Arterial stiffness was assessed by Sphygmocor®, by analyzing the morphology and pulse wave velocity. Cardiac autonomic modulation (CAM) was assessed by analyzing heart rate variability indexes (mean HR, RMSSD, LF, HF, ApEn, SampEn, DFA). Different vascular responses were observed after PM: (1) increased vascular diameter (responders) (n = 13, %FMD = 11.89 ± 5.64) and (2) reduced vascular diameter (non-responders) (n = 19, %FMD= -7.42 ± 6.44). Responders presented a higher non-linear DFA2 index (p = 0.02). There was a positive association between FMD and DFA (r = 0.529; p = 0.03); FMD and SampEn (r = 0.633; p < 0.01). A negative association was identified between FMD and LF (Hz) (r= -0.680; p < 0.01) and IL-6 (r= -0.469; p = 0.037) and SR and CRP (r= -0.427; p = 0.03).

Early passive mobilization increases vascular reactivity response in critical patients with sepsis: a quasi-experimental study. / Mobilização passiva precoce aumenta a resposta de reatividade vascular em pacientes graves com sepse: um estudo quase-experimental.

OBJECTIVE: To investigate the influence of a passive mobilization session on endothelial function in patients with sepsis. METHODS: This was a quasi-experimental double-blind and single-arm study with a pre- and postintervention design. Twenty-five patients with a diagnosis of sepsis who were hospitalized in the intensive care unit were included. Endothelial function was assessed at baseline (preintervention) and immediately postintervention by brachial artery ultrasonography. Flow mediated dilatation, peak blood flow velocity and peak shear rate were obtained. Passive mobilization consisted of bilateral mobilization (ankles, knees, hips, wrists, elbows and shoulders), with three sets of ten repetitions each, totaling 15 minutes. RESULTS: After mobilization, we found increased vascular reactivity function compared to preintervention: absolute flow-mediated dilatation (0.57mm ± 0.22 versus 0.17mm ± 0.31; p < 0.001) and relative flow-mediated dilatation (17.1% ± 8.25 versus 5.08% ± 9.16; p < 0.001). Reactive hyperemia peak flow (71.8cm/s ± 29.3 versus 95.3cm/s ± 32.2; p < 0.001) and shear rate (211s ± 113 versus 288s ± 144; p < 0.001) were also increased. CONCLUSION: A passive mobilization session increases endothelial function in critical patients with sepsis. Future studies should investigate whether a mobilization program can be applied as a beneficial intervention for clinical improvement of endothelial function in patients hospitalized due to sepsis.

OBJETIVO: Investigar a influência de uma sessão de mobilização passiva na função endotelial de pacientes com sepse. MÉTODOS: Este foi um estudo quase-experimental duplo-cego e de braço único com desenho pré e pós-intervenção. Participaram 25 pacientes com diagnóstico de sepse hospitalizados em unidade de terapia intensiva. Avaliou-se a função endotelial basal (pré-intervenção) e imediatamente pós-intervenção por meio de ultrassonografia da artéria braquial. Foram obtidas a dilatação mediada pelo fluxo, a velocidade pico de fluxo sanguíneo e a taxa de cisalhamento pico. A mobilização passiva consistiu na mobilização bilateral (tornozelos, joelhos, quadris, pulsos, cotovelos e ombros), com três séries de dez repetições cada, totalizando 15 minutos. RESULTADOS: Após a mobilização, encontramos aumento da função de reatividade vascular em relação à pré-intervenção: dilatação mediada pelo fluxo absoluta (0,57mm ± 0,22 versus 0,17mm ± 0,31; p < 0,001) e dilatação mediada pelo fluxo relativa (17,1% ± 8,25 versus 5,08% ± 9,16; p < 0,001). O pico de fluxo sanguíneo na hiperemia (71,8cm/s ± 29,3 versus 95,3cm/s ± 32,2; p < 0,001) e a taxa de cisalhamento (211s ± 113 versus 288s ± 144; p < 0,001) também aumentaram. CONCLUSÃO: Uma sessão de mobilização passiva foi capaz de aumentar a função endotelial em pacientes graves com sepse. Estudos futuros são necessários para investigar se um programa de mobilização pode ser aplicado como intervenção benéfica para melhorar clinicamente a função endotelial em pacientes hospitalizados por sepse.

Effects of acute inspiratory loading during treadmill running on cerebral, locomotor and respiratory muscle oxygenation in women soccer players.

Respiratory limitation can be a primary mechanism for exercise cessation in female athletes. This study aimed to assess the effects of inspiratory loading (IL) on intercostal muscles (IM), vastus lateralis (VL) and cerebral (Cox) muscles oxygenation in women soccer players during high-intensity dynamic exercise. Ten female soccer players were randomized to perform in order two constant-load tests on a treadmill until the exhaustion time (Tlim) (100 % of maximal oxygen uptake- V˙O2). They breathed freely or against a fixed inspiratory loading (IL) of 41 cm H2O (∼30 % of maximal inspiratory pressure). Oxygenated (Δ[OxyHb]), deoxygenated (Δ[DeoxyHb]), total hemoglobin (Δ[tHb]) and tissue saturation index (ΔTSI) were obtained by NIRs. Also, blood lactate [La-] was obtained. IL significantly reduced Tlim (224 ± 54 vs 78 ± 20; P < 0.05) and increased [La-], V˙O2, respiratory cycles and dyspnea when corrected to Tlim (P < 0.05). IL also resulted in decrease of Δ[OxyHb] of Cox and IM during exercise compared with rest condition. In addition, decrease of Δ[OxyHb] was observed on IM during exercise when contrasted with Sham (P < 0.05). Furthermore, significant higher Δ[DeoxyHb] of IM and significant lower Δ[DeoxyHb] of Cox were observed when IL was applied during exercise in contrast with Sham (P < 0.05). These results were accompanied with significant reduction of Δ[tHb] and ΔTSI of IM and VL when IL was applied (P < 0.05). High-intensity exercise with IL decreased respiratory and peripheral muscle oxygenation with negative impact on exercise performance. However, the increase in ventilatory work did not impact cerebral oxygenation in soccer players.

Overlap syndrome: the coexistence of OSA further impairs cardiorespiratory fitness in COPD.

BACKGROUND: Cardiorespiratory fitness (CRF) is an important prognostic marker in chronic obstructive pulmonary disease (COPD). Obstructive sleep apnea (OSA) also negatively affects exercise tolerance. However, the impact of their association on CRF has not been evaluated. We hypothesized that patients with overlap syndrome would demonstrate a greater impairment in CRF, particularly those with severe COPD. METHODS: Individuals with COPD were recruited. First, subjects underwent clinical and spirometry evaluation. Next, home-based sleep evaluation was performed. Subjects with an apnea-hypopnea index (AHI) < 15 episodes/h were allocated to the COPD group and those with an AHI ≥ 15 episodes/h to the overlap group. On the second visit, subjects underwent a cardiopulmonary exercise test. Subsequently, they were divided into four groups according to the severity of COPD and coexistence of OSA: COPDI/II; overlap I/II; COPDIII/IV; and overlap III/IV. RESULTS: Of the 268 subjects screened, 31 were included. The overlap group exhibited higher values for peak carbon dioxide (COPD: 830 [678-1157]; overlap: 1127 [938-1305] mm Hg; p < 0.05), minute ventilation (COPD: 31 [27-45]; overlap: 48 [37-55] L; p < 0.05), and peak systolic blood pressure (COPD: 180 [169-191]; overlap: 220 [203-227] mm Hg; p <; 0.001) and peak diastolic blood pressure COPD: 100 [93-103]; overlap: 110 [96-106] mm Hg; p < 0.001). COPD severity associated with OSA produced a negative impact on exercise time (COPDIII/IV: 487 ± 102; overlap III/IV: 421 ± 94 s), peak oxygen uptake (COPDIII/IV: 12 ± 2; overlap III/IV: 9 ± 1 ml.Kg.min-1 ; p < 0.05) and circulatory power (COPDIII/IV: 2306 ± 439; overlap III/IV: 2162 ± 340 ml/kg/min.mmHg; p < 0.05). CONCLUSION: Overlap syndrome causes greater hemodynamic and ventilatory demand at the peak of dynamic exercise. In addition, OSA overlap in individuals with more severe COPD impairs CRF.

Hypothermia post-cardiopulmonary resuscitation with low inputs: an experience report.

OBJECTIVE: to report the experience of conducting directed temperature control of a post-cardiopulmonary resuscitation patient, with reduced and basic inputs available at the institution. METHOD: an experience report of directed temperature control in patient (age 15 years), after four hours of cardiopulmonary resuscitation in an Intensive Care Unit of a hospital in São Paulo State countryside in 2016, according to the protocol suggested by the American Heart Association, in 2015. There were applications of cold compresses, plastic bags with crushed ice and rectal temperature control. RESULTS: after eight hours, temperature had reached 93.2 ºF. Body cooling was maintained for 24 hours. However, bags with crushed ice were used in the first 6 hours. CONCLUSION: conduct of nurses to obtain the body cooling with reduced and basic inputs was effective during the stay at the Intensive Care Unit.

Hypothermia post-cardiopulmonary resuscitation with low inputs: an experience report / Hipotermia post-ressuscitación cardiopulmonar con bajos insumos: relato de experiencia / Hipotermia pós ressuscitação cardiopulmonar com baixos insumos: relato de experiência

ABSTRACT Objective: to report the experience of conducting directed temperature control of a post-cardiopulmonary resuscitation patient, with reduced and basic inputs available at the institution. Method: an experience report of directed temperature control in patient (age 15 years), after four hours of cardiopulmonary resuscitation in an Intensive Care Unit of a hospital in São Paulo State countryside in 2016, according to the protocol suggested by the American Heart Association, in 2015. There were applications of cold compresses, plastic bags with crushed ice and rectal temperature control. Results: after eight hours, temperature had reached 93.2 ºF. Body cooling was maintained for 24 hours. However, bags with crushed ice were used in the first 6 hours. Conclusion: conduct of nurses to obtain the body cooling with reduced and basic inputs was effective during the stay at the Intensive Care Unit.

RESUMEN Objetivo: relatar la experiencia de la conducción de control dirigido de la temperatura de una paciente después de la resucitación cardiopulmonar, con insumos reducidos y básicos disponibles en la institución. Método: el informe de experiencia de control direccionado de la temperatura en paciente (edad 15 años), después de cuatro horas de resucitación cardiopulmonar en una Unidad de Terapia Intensiva de un hospital del interior del estado de São Paulo, en el año 2016, conforme protocolo sugerido por la American Heart Association en 2015. Se utilizaron aplicaciones de compresas embebidas en agua helada, bolsas plásticas con hielo triturado y control de la temperatura rectal. Resultados: en ocho horas, la temperatura alcanzó los 34 ºC. El enfriamiento corporal se mantuvo durante 24 horas, sin embargo, las bolsas con hielo triturado se utilizaron en las primeras 6 horas. Conclusión: la conducta de los enfermeros para obtener el enfriamiento corporal con insumos reducidos y básicos, se mostró efectiva durante la permanencia en la Unidad de Terapia Intensiva.

RESUMO Objetivo: relatar a experiência da condução de controle direcionado da temperatura de uma paciente pós ressuscitação cardiopulmonar, com insumos reduzidos e básicos disponíveis na instituição. Método: relato de experiência de controle direcionado da temperatura em paciente (idade 15 anos) após quatro horas de ressuscitação cardiopulmonar em uma unidade de terapia intensiva de um hospital do interior do Estado de São Paulo, no ano de 2016, conforme protocolo sugerido pela American Heart Association 2015. Utilizou-se aplicações de compressas embebidas em água gelada, sacos plásticos com gelo triturado e controle da temperatura retal. Resultados: em oito horas a temperatura atingiu 34ºC. O resfriamento corporal foi mantido por 24 horas, todavia os sacos com gelo triturado foram utilizados nas primeiras 6 horas. Conclusão: a conduta dos enfermeiros para obter o resfriamento corporal com insumos reduzidos e básicos, mostrou-se efetiva durante a permanência na unidade de terapia intensiva.

Noninvasive measurements of hemodynamic, autonomic and endothelial function as predictors of mortality in sepsis: A prospective cohort study.

BACKGROUND AND AIM: Sepsis is associated with marked alterations in hemodynamic responses, autonomic dysfunction and impaired vascular function. However, to our knowledge, analysis of noninvasive markers to identify greater risk of death has not yet been investigated. Thus, our aim was to explore the prognostic utility of cardiac output (CO), stroke volume (SV), indices of vagal modulation (RMSSD and SD1), total heart rate variability (HRV) indices and FMD of brachial artery (%FMD), all measured noninvasively, in the first 24 hours of the diagnosis of sepsis. METHODS: 60 patients were recruited at ICU between 2015 and 2017 and followed by 28 days. CO, SV, RR intervals were measurement. Doppler ultrasound was used to assess brachial artery FMD and the hyperemic response were obtained (%FMD). Patients were divided by survivors (SG) and nonsurvivors groups (NSG). RESULTS: A total of 60 patients were analysed (SG = 21 and NSG = 39). Survivors were younger (41±15 years vs. 55±11 years) and used less vasoactive drugs. As expected, APACHE and SOFA scores were lower in NSG compared to SG. In addition, higher SD1, triangular index, % FMD, velocity baseline and hyperemia flow velocity as well as lower HR values were observed in the SG, compared to NSG (P<0.05). Interestingly, RMSSD and SD1 indices were independent predictors of %FMD, ΔFMD and FMDpeak. RMSSD threshold of 10.8ms and %FMD threshold of -1 were optimal at discriminatomg survivors and nonsurvivors. CONCLUSION: Noninvasive measurements of autonomic and endotelial function may be important markers of sepsis mortality, which can be easily obtained in the early stages of sepsis at the bedside.

Myostatin and adipokines: The role of the metabolically unhealthy obese phenotype in muscle function and aerobic capacity in young adults.

Obesity is often associated with metabolic disorders. However, some obese people can present a metabolically healthy phenotype, despite having excessive body fat. Obesity-related cytokines, such as myostatin (MSTN), leptin (LP) and adiponectin (ADP) appear to be key factors for the regulation of muscle and energy metabolism. Our aim was to compare lipid, glucose-insulin and inflammatory (tumor necrosis factor alpha; TNF-α) profiles, muscle function, energy expenditure and aerobic capacity between healthy normal-weight (NW) adults, metabolically healthy obese (MHO) and metabolically unhealthy obese (MUHO) adults; to study the associations between these outcomes and the cytokines MSTN, ADP, LP; and to establish cutoffs for MSTN and LP/ADP to identify the MUHO phenotype. Sixty-one young adults (NW, n = 24; MHO, n = 16; MUHO, n = 21) underwent body composition (body fat -BF and muscle mass - MM), energy expenditure at rest (RER) and aerobic capacity (VO2peak) evaluation, muscle strength and endurance tests and blood profile characterization (glucose-insulin homeostasis and serum MSTN, ADP, LP and TNF-α). MHO and MUHO had a BMI ≥ 30 kg m-2. MUHO was defined as presenting ≥3 criteria for metabolic syndrome (NCEP/ATPIII) in association with insulin resistance (HOMA-IR ≥3.46). MSTN and LP/ADP were associated with MM, MetS and glucose-insulin profile; MSTN was associated with TNF-α and only LP/ADP was associated with parameters of obesity and VO2peak. Neither MSTN nor LP/ADP was associated with muscle functions (p < .05 for adjusted correlations). Both of them were able to discriminate the MUHO phenotype: MSTN [AUC(95%CI) = 0.71(0.55-0.86), MSTN > 517.3 pg/mL] and LP/ADP [AUC(95%CI) = 0.89(0.81-0.97), LP/ADP > 2.14 pg/ng]. In conclusion, high MSTN and LP/ADP are associated with MetS, glucose-insulin homeostasis impairment and low muscle mass. Myostatin is associated with TNF-α and leptin-to-adiponectin ratio is associated with body fatness and aerobic capacity. Neither MSTN nor LP/ADP is associated with energy expenditure, muscle strength and endurance. Myostatin and adipokines cutoffs can identify the metabolically unhealthy obese phenotype in young adults with acceptable accuracy.

Prediction of Cardiorespiratory Fitness by the Six-Minute Step Test and Its Association with Muscle Strength and Power in Sedentary Obese and Lean Young Women: A Cross-Sectional Study.

Impaired cardiorespiratory fitness (CRF) is a hallmark characteristic in obese and lean sedentary young women. Peak oxygen consumption (VO2peak) prediction from the six-minute step test (6MST) has not been established for sedentary females. It is recognized that lower-limb muscle strength and power play a key role during functional activities. The aim of this study was to investigate cardiorespiratory responses during the 6MST and CPX and to develop a predictive equation to estimate VO2peak in both lean and obese subjects. Additionally we aim to investigate how muscle function impacts functional performance. Lean (LN = 13) and obese (OB = 18) women, aged 20-45, underwent a CPX, two 6MSTs, and isokinetic and isometric knee extensor strength and power evaluations. Regression analysis assessed the ability to predict VO2peak from the 6MST, age and body mass index (BMI). CPX and 6MST main outcomes were compared between LN and OB and correlated with strength and power variables. CRF, functional capacity, and muscle strength and power were lower in the OB compared to LN (<0.05). During the 6MST, LN and OB reached ~90% of predicted maximal heart rate and ~80% of the VO2peak obtained during CPX. BMI, age and number of step cycles (NSC) explained 83% of the total variance in VO2peak. Moderate to strong correlations between VO2peak at CPX and VO2peak at 6MST (r = 0.86), VO2peak at CPX and NSC (r = 0.80), as well as between VO2peak, NSC and muscle strength and power variables were found (p<0.05). These findings indicate the 6MST, BMI and age accurately predict VO2peak in both lean and obese young sedentary women. Muscle strength and power were related to measures of aerobic and functional performance.

Poor glycemic control impacts linear and non-linear dynamics of heart rate in DM type 2 / Pobre controle glicêmico impacta a dinâmica linear e não linear da frequência cardíaca no DM2 / Control glucémico deficiente impacta la dinámica lineal y no lineal de la frecuencia cardíaca en el DM2

INTRODUCTION: It is well known that type 2 diabetes mellitus (T2DM) produces cardiovascular autonomic neuropathy (CAN), which may affect the cardiac autonomic modulation. However, it is unclear whether the lack of glycemic control in T2DM without CAN could impact negatively on cardiac autonomic modulation. Objective: To evaluate the relationship between glycemic control and cardiac autonomic modulation in individuals with T2DM without CAN. Descriptive, prospective and cross sectional study.METHODS: Forty-nine patients with T2DM (51±7 years) were divided into two groups according to glycosylated hemoglobin (HbA1c): G1≤7% and G2>7.0%. Resting heart rate (HR) and RR interval (RRi) were obtained and calculated by linear (Mean iRR; Mean HR; rMSSD; STD RR; LF; HF; LF/HF, TINN and RR Tri,) and non-linear (SD1; SD2; DFα1; DFα2, Shannon entropy; ApEn; SampEn and CD) methods of heart rate variability (HRV). Insulin, HOMA-IR, fasting glucose and HbA1c were obtained by blood tests.RESULTS: G2 (HbA1c≤7%) showed lower values for the mean of iRR; STD RR; RR Tri, TINN, SD2, CD and higher mean HR when compared with G1 (HbA1c > 7%). Additionally, HbA1c correlated negatively with mean RRi (r=0.28, p=0.044); STD RR (r=0.33, p=0.017); RR Tri (r=-0.35, p=0.013), SD2 (r=-0.39, p=0.004) and positively with mean HR (r=0.28, p=0.045). Finally, fasting glucose correlated negatively with STD RR (r=-0.36, p=0.010); RR Tri (r=-0.36, p=0.010); TINN (r=-0.33, p=0.019) and SD2 (r=-0.42, p=0.002).CONCLUSION: We concluded that poor glycemic control is related to cardiac autonomic modulation indices in individuals with T2DM even if they do not present cardiovascular autonomic neuropathy.

INTRODUÇÃO: É de conhecimento geral que o diabetes mellitus tipo 2 (DM2) produz neuropatia autonômica cardiovascular (NAC), que pode afetar a modulação autonômica cardíaca. Entretanto, não é claro se a falta de controle glicêmico em diabéticos tipo 2 sem NAC, poderia impactar negativamente na modulação autonômica cardíaca. Objetivo: Avaliar a relação entre controle glicêmico e modulação autonômica cardíaca em indivíduos com DM2 sem neuropatia autonômica cardiovascular. Estudo descritivo, prospectivo e transversal.MÉTODOS: Quarenta e nove pacientes com DM2 (51±7 anos) foram divididos em dois grupos de acordo com a hemoglobina glicosilada (HbA1c): G1: ≤ 7% e G2: >7,0%. A frequência cardíaca de repouso (FC) e intervalo RR (iRR) foram obtidos e calculados por métodos lineares (média iRR; média FC; rMSSD; STD RR; LF; HF; LF/HF, TINN e RR Tri) e não lineares (SD1; SD2; DFα1; DFα2, Entropia de Shannon; ApEn; SampEn e CD) de variabilidade de frequência cardíaca. Insulina, HOMA-IR, glicemia de jejum e HbA1c foram obtidas por análises sanguíneas.RESULTADOS: G2 (HbA1c ≤ 7%) mostrou valores menores para média de iRR; STD RR; RR Tri, TINN, SD2, CD e maiores para média de FR quando comparado com G1 (HbA1c > 7%). Adicionalmente, HbA1c correlacionou-se negativamente com media iRR (r=0,28, p=0,044); STD RR (r=0,33, p=0,017); RR Tri (r=-0,35, p=0,013), SD2 (r=-0,39, p=0,004) e positivamente com média FC (r=0,28, p=0,045). Finalmente, a glicemia de jejum correlacionou-se negativamente com STD RR (r=-0,36, p=0,010); RR Tri (r=-0,36, p=0,010); TINN (r=-0,33, p=0,019) e SD2 (r=-0,42, p=0,002).CONCLUSÃO: Conclui que o controle glicêmico deficiente relaciona-se com índices de modulação autonômica cardíaca em indivíduos com DM2, ainda que não apresentem neuropatia autonômica cardiovascular.

INTRODUCCIÓN: Es de conocimiento general que la diabetes mellitus tipo 2 (DM2) produce neuropatía autonómica cardiovascular (NAC), que puede afectar la modulación autonómica cardíaca. Entretanto, no es claro si la falta de control glucémico en diabéticos tipo 2 sin NAC, podría impactar negativamente en la modulación autonómica cardíaca. Objetivo: Evaluar la relación entre control glucémico y modulación autonómica cardíaca en individuos con DM2 sin neuropatía autonómica cardiovascular. Estudio descriptivo, prospectivo y transversal.MÉTODOS: Cuarenta y nueve pacientes con DM2 (51±7 años) fueron divididos en dos grupos de acuerdo con la hemoglobina glucosilada (HbA1c): G1: ≤ 7% y G2: >7,0%. La frecuencia cardíaca de reposo (FC) e intervalo RR (iRR) fueron obtenidos y calculados por métodos lineales (promedio iRR; promedio FC; rMSSD; STD RR; LF; HF; LF/HF, TINN y RR Tri) y no lineales (SD1; SD2; DFα1; DFα2, Entropía de Shannon; ApEn; SampEn y CD) de variabilidad de frecuencia cardíaca. Fueron obtenidas insulina, HOMA-IR, glucemia en ayunas y HbA1c a través de análisis sanguíneos.RESULTADOS: G2 (HbA1c ≤ 7%) mostró valores menores para el promedio de iRR; STD RR; RR Tri, TINN, SD2, CD y mayores para el promedio de FR al ser comparado con G1 (HbA1c > 7%). Adicionalmente, HbA1c se correlacionó negativamente con el promedio iRR (r=0,28, p=0,044); STD RR (r=0,33, p=0,017); RR Tri (r=-0,35, p=0,013), SD2 (r=-0,39, p=0,004) y positivamente con el promedio FC (r=0,28, p=0,045). Finalmente, la glucemia en ayunas se correlacionó negativamente con STD RR (r=-0,36, p=0,010); RR Tri (r=-0,36, p=0,010); TINN (r=-0,33, p=0,019) e SD2 (r=-0,42, p=0,002).CONCLUSIÓN: Concluimos que el control glucémico deficiente se relaciona con índices de modulación autonómica cardíaca en individuos con DM2, aunque no presenten neuropatía autonómica cardiovascular.

A retrospective study of 40 victims of Crotalus snake bites: analysis of the hepatic necrosis observed in one patient

Os autores avaliaram 40 doentes com diagnóstico de acidente crotálico, atendidos no Serviço de Moléstias Infecciosas e parasitárias da Faculdade de Medicina de Botucatu. Desses, 30 eram do sexo masculino e 10 do feminino, com idades variando entre 16 e 70 anos. Todos eream lavradores e 35 deles foram atingidos nos membros inferiores. A maioria dos doentes (31) foi atendida antes de 6 horas do acidente. Dos 9 que receberam atendimento médico após 6 horas, 2 deles evoluíram para o óbito. Os resultados observados revelaram que o baixo índice de mortalidade (5%) verificado pode eventualmente ser explicado pelo atendimento precoce, uso de doses adequadas de soro anticrotálico, hidrataçäo parenteral, alcalinizaçäo da urina com bicarbonato de sódio e induçäo da diurese osmótica com soluçäo de manitol. O exame anatomopatológico de um dos casos que evoluiu para o óbito apresntou extensa necrose hepática. Os autores discutem a possibilidade de interaçäo entre alcoolismo crônico e a açäo eventual de um fator hepatóxico do veneno da serpente na gênese da necrose hepática e no aumento dos níveis de transaminases