HCO3 E BE: ANÁLISE E IMPORTÂNCIA FISIOLÓGICA NA GASOMETRIA ARTERIAL

2021 ◽  
Author(s):  
Lucas Feliciano Cavalheiro ◽  
Fernanda Viana Paulin
Keyword(s):  
Base Excess ◽  
Buffer Base

Introdução: A gasometria arterial é um exame complementar realizado através de coleta de sangue arterial, que visa a análise dos gases (pressão de oxigênio no sangue arterial- paO2, pressão de gás carbônico- paCO2) e dos principais componentes metabólicos do sangue (bicarbonato- HCO3 e Base Excess- Be), além do pH sanguíneo. De grande utilidade para a equipe multiprofissional, a gasometria arterial tem papel essencial para diagnóstico, avaliação terapêutica e tomada de decisões. Objetivo: Demonstrar a importância de dois componentes metabólicos da gasometria arterial, HCO3 e Be, bem como o impacto fisiológico que ambos podem gerar. Material e métodos: Revisão de literatura não sistematizada, nas bases de busca Google Acadêmico, entre os anos de 2018 e 2020. Resultados: A gasometria arterial revela dados fisiológicos que norteiam o diagnóstico e a busca pela melhor proposta terapêutica, como prescrição precisa de oxigenoterapia, correção bioquímica e ajustes ventilatórios, por exemplo. O HCO3 atua no sistema fisiológico auxiliando no transporte de oxigênio pelo organismo, a regulação desse componente no sangue ocorre através dos rins. O bicarbonato atua no sistema tampão buscando a neutralização do sangue em um aspecto mais básico. Na acidose respiratória o HCO3 plasmático normalmente encontra-se aumentado, a fim de combater o distúrbio primário, quanto a atuação na alcalose respiratória ocorre uma diminuição do bicarbonato em busca da compensação também do distúrbio primário. O Be é quando a soma de todas as bases ultrapassa os parâmetros de referência do Buffer Base, o Base Excess permite que haja a determinação da origem do distúrbio em questão, de modo que aponte quem está alterado e quem está apresentando compensação. Conclusão: O HCO3 e o Be são componentes que devem por suas funções fisiológicas serem analisados para a busca da terapêutica ideal aos pacientes, por suas características tornam-se imprescindíveis na gasometria arterial.

The Use of THAM in the Treatment of Status Asthmaticus

PEDIATRICS ◽  
1966 ◽  
Vol 38 (4) ◽  
pp. 655-657
Author(s):  
JOSE STRAUSS ◽  
RICHARD N. FINE ◽  
DAVID A. MEDINA ◽  
GEORGE N. DONNELL
Keyword(s):  
Metabolic Acidosis ◽  
Blood Serum ◽  
Asthmatic Patient ◽  
Pediatric Patients ◽  
Status Asthmaticus ◽  
Base Excess ◽  
Capillary Blood ◽  
Fast State ◽  
Serum Electrolytes ◽  
Buffer Base

The treatment of status asthmaticus (epinephrine-fast state in an acutely ill asthmatic patient) has been described frequently; however, the need to correct the respiratory and metabolic acidosis which accompanies this condition has not been emphasized. Recently such recommendations have appeared in the nonpediatric literature of this country and of Europe. The purpose of this paper is to report two pediatric patients with status asthmaticus who recovered after administration of Tris (hydroxymethyl) aminomethane (THAM), an amine alkalinizing agent. Methods The Astrup technique employing the ME-l equipment and Sigaard-Andersen's nomogram were used to determine pH, pCO2, Base Excess (B.E.), Buffer Base (B.B.) and Standard Bicarbonate (S.B.) of capillary blood. Serum electrolytes were determined by conventional methods. [SEE TABLE I AND II IN SOURCE PDF].

AN EQUATION FOR CALCULATING "DERIVED" ACID–BASE PARAMETERS

1967 ◽  
Vol 45 (5) ◽  
pp. 891-895 ◽  
Author(s):  
Jesus T. Suero ◽  
C. R. Woolf
Keyword(s):  
Computer Program ◽  
Base Excess ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Acid Base ◽  
Exponential Relationship ◽  
Bicarbonate Buffer ◽  
Hydrogen Ion Concentration ◽  
Base Parameters ◽  
Buffer Base

An equation to derive standard bicarbonate from any given pH and [Formula: see text] values was derived based on the observation of an empirical exponential relationship between hydrogen ion concentration and the slope of standard bicarbonate/[Formula: see text]. The equation was used in a computer program to give tables of calculated values of various derived parameters that are presently used in clinical acid–base assessment; namely, standard bicarbonate, buffer base, and base excess, from a given range of pH and [Formula: see text] values including variations imposed by hematocrit values. A new term, "non-respiratory acid excess", is introduced.

Effect of different chloride infusion rates on plasma base excess during neonatal parenteral nutrition

1993 ◽  
Vol 82 (8) ◽  
pp. 678-682 ◽  
Author(s):  
CE Richards ◽  
M. Drayton ◽  
H. Jenkins ◽  
TJ Peters
Keyword(s):  
Parenteral Nutrition ◽  
Base Excess

Carbon Dioxide Equilibration in Canine Lungs during Rebreathing and Acute Alkalosis

1979 ◽  
Vol 57 (5) ◽  
pp. 385-388 ◽  
Author(s):  
R. D. Latimer ◽  
G. Laszlo
Keyword(s):  
Whole Blood ◽  
Base Excess ◽  
Venous Blood ◽  
Main Pulmonary Artery ◽  
Mixed Venous Blood ◽  
Arterial Blood ◽  
Significant Difference ◽  
Venous Pco2 ◽  
Pulmonary Arterial ◽  
Gas Pressures

1. The left lower lobe of the lungs of six anaesthetized dogs were isolated by the introduction of a bronchial cannula at thoracotomy. Catheters were introduced into the main pulmonary artery and a vein draining the isolated lobe. 2. Blood-gas pressures and pH were measured across the isolated lobe and compared with gas pressures in alveolar samples from the lobe. 3. When the isolated lobe was allowed to reach gaseous equilibrium with pulmonary arterial blood for 30 min, there was no significant difference between alveolar and pulmonary venous Pco2. Mean values of whole-blood base excess were similar in pulmonary arterial and pulmonary venous blood. 4. After injection of 20 ml of 8·4% sodium bicarbonate solution into a peripheral vein, Pco2, pH and plasma bicarbonate concentrations rose in the mixed venous blood. There was no change of whole-blood base excess across the lung, indicating that HCO−3, as distinct from dissolved CO2, did not enter lung tissue in measurable amounts. 5. No systematic alveolar—pulmonary venous Pco2 differences were demonstrated in this preparation other than those explicable by maldistribution of lobar blood flow.

scholarly journals Base-enhanced catalytic water oxidation by a carboxylate–bipyridine Ru(II) complex

2015 ◽  
Vol 112 (16) ◽  
pp. 4935-4940 ◽  
Author(s):  
Na Song ◽  
Javier J. Concepcion ◽  
Robert A. Binstead ◽  
Jennifer A. Rudd ◽  
Aaron K. Vannucci ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Proton Transfer ◽  
Water Oxidation ◽  
Proton Acceptor ◽  
Half Time ◽  
X Ray ◽  
X Ray Crystallography ◽  
Buffer Base ◽  
Electron Proton Transfer ◽  
C Nmr

In aqueous solution above pH 2.4 with 4% (vol/vol) CH3CN, the complex [RuII(bda)(isoq)2] (bda is 2,2′-bipyridine-6,6′-dicarboxylate; isoq is isoquinoline) exists as the open-arm chelate, [RuII(CO2-bpy-CO2−)(isoq)2(NCCH3)], as shown by 1H and 13C-NMR, X-ray crystallography, and pH titrations. Rates of water oxidation with the open-arm chelate are remarkably enhanced by added proton acceptor bases, as measured by cyclic voltammetry (CV). In 1.0 M PO43–, the calculated half-time for water oxidation is ∼7 μs. The key to the rate accelerations with added bases is direct involvement of the buffer base in either atom–proton transfer (APT) or concerted electron–proton transfer (EPT) pathways.

Dilutional Acidosis following Hetastarch or Albumin in Healthy Volunteers

2000 ◽  
Vol 93 (5) ◽  
pp. 1184-1187 ◽  
Author(s):  
Jonathan H. Waters ◽  
Clifford A. Bernstein
Keyword(s):  
Healthy Volunteers ◽  
Repeated Measures ◽  
Base Excess ◽  
Rank Test ◽  
Albumin Concentration ◽  
Acid Base Balance ◽  
Arterial Blood Gas ◽  
Arterial Blood ◽  
The Impact

Background The intent of this study was to evaluate the impact of the commonly used colloids-hetastarch and albumin-on in vivo acid-base balance. From this evaluation, a better understanding of the mechanism of dilutional acidosis was expected. Methods In a prospective, randomized fashion, 11 healthy volunteers were administered 15 ml/kg hetastarch solution, 6%, or 15 ml/kg albumin, 5%, intravenously over 30 min. Four weeks later, the study subjects were administered the other colloid. Arterial blood gas and electrolyte parameters were measured at baseline and at 30, 60, 90, 120, 210, and 300 min after colloid administration. Pre- and postlaboratory values were compared within groups using a paired t test and a Wilcoxon signed rank test and between groups using repeated-measures analysis of variance and a Wilcoxon rank sum test. Results Thirty min after infusion, subjects who were administered hetastarch showed statistically significant changes (P < 0.05) in base excess (from 2.5 +/- 0.9 mEq/l to 0.7 +/- 1.1 mEq/l), HCO3- concentration (from 27 +/- 1.0 mEq/l to 25 +/- 1.3 mEq/l), Cl- concentration (from 108 +/- 2 mEq/l to 112 +/- 2 mEq/l), albumin concentration (from 4.4 +/- 0.2 g/dl to 3.5 +/- 0.5 g/dl), and arterial carbon dioxide tension (Paco2; from 40.8 +/- 2.3 mmHg to 39. 2 +/- 3.2 mmHg), whereas only the albumin concentration (from 4.4 +/- 0.2 g/dl to 4.8 +/- 0.6 g/dl) changed significantly in the albumin-treated group. Conclusions Decreases in base excess were observed for 210 min after hetastarch administration but not after albumin. The mechanism for this difference is discussed.

V˙o 2 and heart rate kinetics in cycling: transitions from an elevated baseline

2001 ◽  
Vol 90 (6) ◽  
pp. 2081-2087 ◽  
Author(s):  
S. E. Bearden ◽  
R. J. Moffatt
Keyword(s):  
Heart Rate ◽  
Base Excess ◽  
Slow Component ◽  
Lactate Concentration ◽  
Fast Component ◽  
Square Wave ◽  
Mean Response Time ◽  
Rate Kinetics ◽  
Component Amplitude ◽  
Heart Rate Kinetics

The purpose of this study was to examine oxygen consumption (V˙o 2) and heart rate kinetics during moderate and repeated bouts of heavy square-wave cycling from an exercising baseline. Eight healthy, male volunteers performed square-wave bouts of leg ergometry above and below the gas exchange threshold separated by recovery cycling at 35%V˙o 2 peak.V˙o 2 and heart rate kinetics were modeled, after removal of phase I data by use of a biphasic on-kinetics and monoexponential off-kinetics model. Fingertip capillary blood was sampled 45 s before each transition for base excess, HCO[Formula: see text] and lactate concentration, and pH. Base excess and HCO[Formula: see text] concentration were significantly lower, whereas lactate concentration and pH were not different before the second bout. The results confirm earlier reports of a smaller mean response time in the second heavy bout. This was the result of a significantly greater fast-component amplitude and smaller slow-component amplitude with invariant fast-component time constant. A role for local oxygen delivery limitation in heavy exercise transitions with unloaded but not moderate baselines is presented.

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