Pharmacokinetics and Pharmacodynamics of Lansoprazole/Sodium Bicarbonate Immediate-release Capsules in Healthy Chinese Subjects: An Open, Randomized, Controlled, Crossover, Single-, and Multiple-dose Trial.

Proton pump inhibitors (PPIs) differ in onset of action and bioavailability. This trial was conducted to investigate the pharmacokinetics and pharmacodynamics of an immediate-release capsule formulation containing lansoprazole 30 mg and sodium bicarbonate 1100 mg (T preparation) in healthy Chinese subjects. This was an open, single-center, randomized, single and multiple oral doses, and two-period crossover study in 30 healthy subjects. After single- and multiple-dose oral administration, blood samples were obtained and lansoprazole concentration in serum was measured for pharmacokinetic analysis. Meanwhile, the intragastric pH was monitored continuously to evaluate the pharmacodynamics of the investigational drugs. The Tmax of the T preparation was 0.5 hours, while the Tmax of the R preparation was 1.5 hours after multiple doses, which indicated that the absorption speed of the T preparation was significantly faster than that of the R preparation. The same characteristics also existed after single-dose administration. The area under the curve (AUC)ss of the T preparation was bio-equivalent to that of the R preparation under steady state. The time percentage of intragastric pH > 4.0 for the T preparation was higher than that of the R preparation after 1 hour for both single- and multiple-dose. It suggested compared with R preparation, the time percentage of intragastric pH > 4.0 met the criteria for superiority after 1 hour administration for the T preparation. In addition, no serious adverse events occurred in this study. Across this study, the T preparation was better than the R preparation at improving drug absorption and increasing intragastric pH, and had a favorable safety profile.

Exogenous ketosis increases blood and muscle oxygenation but not performance during exercise in hypoxia.

Available evidence indicates that elevated blood ketones are associated with improved hypoxic tolerance in rodents. From this perspective, we hypothesized that exogenous ketosis by oral intake of the ketone ester (R)-3-hydroxybutyl (R)-3-hydroxybutyrate (KE) may induce beneficial physiological effects during prolonged exercise in acute hypoxia. As we recently demonstrated KE to deplete blood bicarbonate, which per se may alter the physiological response to hypoxia, we evaluated the effect of KE both in the presence and absence of bicarbonate intake (BIC). Fourteen highly trained male cyclists performed a simulated cycling race (RACE) consisting of 3-h intermittent cycling (IMT180') followed by a 15-min time-trial (TT15') and an all-out sprint at 175% of lactate threshold (SPRINT). During RACE, fraction of inspired oxygen ([Formula: see text]) was gradually decreased from 18.6% to 14.5%. Before and during RACE, participants received either 1) 75 g of ketone ester (KE), 2) 300 mg/kg body mass bicarbonate (BIC), 3) KE + BIC, or 4) a control drink in addition to 60 g of carbohydrates/h in a randomized, crossover design. KE counteracted the hypoxia-induced drop in blood ([Formula: see text]) and muscle oxygenation by ∼3%. In contrast, BIC decreased [Formula: see text] by ∼2% without impacting muscle oxygenation. Performance during TT15' and SPRINT were similar between all conditions. In conclusion, KE slightly elevated the degree of blood and muscle oxygenation during prolonged exercise in moderate hypoxia without impacting exercise performance. Our data warrant to further investigate the potential of exogenous ketosis to improve muscular and cerebral oxygenation status, and exercise tolerance in extreme hypoxia.

Metabolic acidosis regulates RGS16 and G protein signaling in osteoblasts.

Chronic metabolic acidosis stimulates cell-mediated net Ca2+ efflux from bone mediated by increased osteoblastic cyclooxygenase 2, leading to prostaglandin E2-induced stimulation of receptor activator of NF-κB ligand-induced osteoclastic bone resorption. Ovarian cancer G protein-coupled receptor-1 (OGR1), an osteoblastic H+-sensing G protein-coupled receptor, is activated by acidosis and leads to increased bone resorption. As regulator of G protein signaling (RGS) proteins limit GPCR signaling, we tested whether RGS proteins themselves are regulated by metabolic acidosis. Primary osteoblasts were isolated from neonatal mouse calvariae and incubated in physiological neutral or acidic (MET) medium. Cells were collected, and RNA was extracted for real-time PCR analysis with mRNA levels normalized to ribosomal protein L13a. RGS1, RGS2, RGS3, RGS4, RGS10, RGS11, and RGS18 mRNA did not differ between MET and neutral medium; however, by 30 min, MET decreased RGS16, which persisted for 60 min and 3 h. Incubation of osteoblasts with the OGR1 inhibitor CuCl2 inhibited the MET-induced increase in RGS16 mRNA. Gallein, a specific inhibitor of Gßγ signaling, was used to determine if downstream signaling by the ßγ-subunit was critical for the response to acidosis. Gallein decreased net Ca2+ efflux from calvariae and cyclooxygenase 2 and receptor activator of NF-κB ligand gene expression from isolated osteoblasts. These results indicate that regulation of RGS16 plays an important role in modulating the response of the osteoblastic GPCR OGR1 to metabolic acidosis and subsequent stimulation of osteoclastic bone resorption.NEW & NOTEWORTHY The results presented in this study indicate that regulation of regulator of G protein signaling 16 and G protein signaling in the osteoblast plays an important role in modulating the response of osteoblastic ovarian cancer G protein-coupled receptor 1 (OGR1) to metabolic acidosis and the subsequent stimulation of osteoclastic bone resorption. Further characterization of the regulation of OGR1 in metabolic acidosis-induced bone resorption will help in understanding bone loss in acidotic patients with chronic kidney disease.

Effect of Bicarbonate on Net Acid Excretion, Blood Pressure, and Metabolism in Patients With and Without CKD: The Acid Base Compensation in CKD Study.

RATIONALE & OBJECTIVE: Patients with CKD are at elevated risk of metabolic acidosis due to impaired net acid excretion (NAE). Identifying early markers of acidosis may guide prevention in chronic kidney disease (CKD). This study compared NAE in participants with and without CKD, as well as the NAE, blood pressure (BP), and metabolomic response to bicarbonate supplementation. STUDY DESIGN: Randomized order, cross-over study with controlled feeding. SETTING & PARTICIPANTS: Participants consisted of 8 patients with CKD (estimated glomerular filtration rate 30-59mL/min/1.73m2 or 60-70mL/min/1.73m2 with albuminuria) and 6 patients without CKD. All participants had baseline serum bicarbonate concentrations between 20 and 28 mEq/L; they did not have diabetes mellitus and did not use alkali supplements at baseline. INTERVENTION: Participants were fed a fixed-acid-load diet with bicarbonate supplementation (7 days) and with sodium chloride control (7 days) in a randomized order, cross-over fashion. OUTCOMES: Urine NAE, 24-hour ambulatory BP, and 24-hour urine and plasma metabolomic profiles were measured after each period. RESULTS: During the control period, mean NAE was 28.3±10.2 mEq/d overall without differences across groups (P=0.5). Urine pH, ammonium, and citrate were significantly lower in CKD than in non-CKD (P<0.05 for each). Bicarbonate supplementation reduced NAE and urine ammonium in the CKD group, increased urine pH in both groups (but more in patients with CKD than in those without), and increased; urine citrate in the CKD group (P< 0.2 for interaction for each). Metabolomic analysis revealed several urine organic anions were increased with bicarbonate in CKD, including 3-indoleacetate, citrate/isocitrate, and glutarate. BP was not significantly changed. LIMITATIONS: Small sample size and short feeding duration. CONCLUSIONS: Compared to patients without CKD, those with CKD had lower acid excretion in the form of ammonium but also lower base excretion such as citrate and other organic anions, a potential compensation to preserve acid-base homeostasis. In CKD, acid excretion decreased further, but base excretion (eg, citrate) increased in response to alkali. Urine citrate should be evaluated as an early and responsive marker of impaired acid-base homeostasis. FUNDING: National Institute of Diabetes and Digestive and Kidney Diseases and the Duke O'Brien Center for Kidney Research. TRIAL REGISTRATION: Registered at ClinicalTrials.gov with study number NCT02427594.

Effect of pre-operative bicarbonate infusion on maternal and perinatal outcomes among women with obstructed labour in Mbale hospital: A double blind randomized controlled trial.

INTRODUCTION: Oral bicarbonate solution is known to improve both maternal and perinatal outcomes among women with abnormal labour (dystocia). Its effectiveness and safety among women with obstructed labour is not known. OBJECTIVE: To determine the effect and safety of a single-dose preoperative infusion of sodium bicarbonate on maternal and fetal blood lactate and clinical outcomes among women with obstructed labour (OL) in Mbale hospital. METHODS: We conducted a double blind, randomised controlled trial from July 2018 to September 2019. The participants were women with OL at term (≥37 weeks gestation), carrying a singleton pregnancy with no other obstetric emergency, medical comorbidity or laboratory derangements. INTERVENTION: A total of 477 women with OL were randomized to receive 50ml of 8.4% sodium bicarbonate (238 women) or 50 mL of 0.9% sodium chloride (239 women). In both the intervention and controls arms, each participant was preoperatively given a single dose intravenous bolus. Every participant received 1.5 L of normal saline in one hour as part of standard preoperative care. OUTCOME MEASURES: Our primary outcome was the mean difference in maternal venous blood lactate at one hour between the two arms. The secondary outcomes were umbilical cord blood lactate levels at birth, neonatal sepsis and early neonatal death upto 7 days postnatal, as well as the side effects of sodium bicarbonate, primary postpartum hemorrhage, maternal sepsis and mortality at 14 days postpartum. RESULTS: The median maternal venous lactate was 6.4 (IQR 3.3-12.3) in the intervention and 7.5 (IQR 4.0-15.8) in the control group, with a statistically non-significant median difference of 1.2 mmol/L; p-value = 0.087. Vargha and Delaney effect size was 0.46 (95% CI 0.40-0.51) implying very little if any effect at all. CONCLUSION: The 4.2g of preoperative intravenous sodium bicarbonate was safe but made little or no difference on blood lactate levels. TRIAL REGISTRATION: PACTR201805003364421.

EndoPil: A Magnetically Actuated Swallowable Capsule for Weight Management: Development and Trials.

Intragastric balloons (IGBs), by occupying the stomach space and prolonging satiety, is a promising method to treat obesity and consequently improves its associated comorbidities, e.g. coronary heart disease, diabetes, and cancer. However, existing IGBs are often tethered with tubes for gas or liquid delivery or require endoscopic assistance for device delivery or removal, which are usually uncomfortable, costly, and may cause complications. This paper presents a novel tetherless, magnetically actuated capsule (EndoPil) which can deploy an IGB inside the stomach after being swallowed and being activated by an external magnet. The external magnet attracts a small magnet inside the EndoPil to open a valve, triggering the chemical reaction of citric acid and potassium bicarbonate to produce carbon dioxide gas, which inflates a biocompatible balloon (around 120 mL). A prototype, 13 mm in diameter and 35 mm in length, was developed. Simulations and bench-top tests were conducted to test the force capability of the magnetic actuation mechanism, the required force to activate the valve, and the repeatability of balloon inflation. Experiments on animal and human were successfully conducted to demonstrate the safety and feasibility of inflating a balloon inside the stomach by an external magnet.

Bicarbonate Unlocks the Ergogenic Action of Ketone Monoester Intake in Endurance Exercise.

PURPOSE: We recently reported that oral ketone ester (KE) intake before and during the initial 30 min of a 3 h 15 min simulated cycling race (RACE) transiently decreased blood pH and bicarbonate without affecting maximal performance in the final quarter of the event. We hypothesized that acid-base disturbances due to KE overrules the ergogenic potential of exogenous ketosis in endurance exercise. METHODS: Nine well-trained male cyclists participated in a similar RACE consisting of 3 h submaximal intermittent cycling (IMT180') followed by a 15-min time trial (TT15') preceding an all-out sprint at 175% of lactate threshold (SPRINT). In a randomized crossover design, participants received (i) 65 g KE, (ii) 300 mg·kg-1 body weight NaHCO3 (BIC), (iii) KE + BIC, or (iv) a control drink (CON), together with consistent 60 g·h-1 carbohydrate intake. RESULTS: KE ingestion transiently elevated blood D-ß-hydroxybutyrate to ~2-3 mM during the initial 2 h of RACE (P < 0.001 vs CON). In KE, blood pH concomitantly dropped from 7.43 to 7.36 whereas bicarbonate decreased from 25.5 to 20.5 mM (both P < 0.001 vs CON). Additional BIC resulted in 0.5 to 0.8 mM higher blood D-ß-hydroxybutyrate during the first half of IMT180' (P < 0.05 vs KE) and increased blood bicarbonate to 31.1 ± 1.8 mM and blood pH to 7.51 ± 0.03 by the end of IMT180' (P < 0.001 vs KE). Mean power output during TT15' was similar between KE, BIC, and CON at ~255 W but was 5% higher in KE + BIC (P = 0.02 vs CON). Time to exhaustion in the sprint was similar between all conditions at ~60 s (P = 0.88). Gastrointestinal symptoms were similar between groups. DISCUSSION: The coingestion of oral bicarbonate and KE enhances high-intensity performance at the end of an endurance exercise event without causing gastrointestinal distress.

Metformin-associated lactic acidosis: reinforcing learning points.

Metformin-associated lactic acidosis (MALA) carries a high mortality rate. It is seen in patients with type 2 diabetes on metformin or patients who attempt suicide with metformin overdose. We present the case of a man in his early 20s with type 2 diabetes, hypertension and hypothyroidism who presented with agitation, abdominal pain and vomiting after ingesting 50-60 g of metformin; he developed severe lactic acidosis (blood pH 6.93, bicarbonate 7.8 mEq/L, lactate 28.0 mEq/L). He was managed with intravenous 8.4% bicarbonate infusion and continuous venovenous haemodiafiltration. He also developed acute renal failure (ARF) requiring intermittent haemodialysis and continuous haemodiafiltration. MALA is uncommon and causes changes in different vital organs and even death. The primary goals of therapy are restoration of acid-base status and removal of metformin. Early renal replacement therapy for ARF can result in rapid reversal of the acidosis and good recovery, even with levels of lactate normally considered to be incompatible with survival.

Hypokalemic paralysis as an initial presentation of Sjogren syndrome.

Sjogren syndrome (SS) is a systemic autoimmune disorder with predominant exocrine gland involvement leading to sicca symptoms. Among extraglandular manifestations, renal disease is the most common. Tubular interstitial nephritis and renal tubular acidosis (RTA) are the common presentations. Mild hypokalemia associated with distal RTA is common in SS, however, severe hypokalemia causing paralysis is unusual. We report the case of a 26-year-old female who presented with hypokalemic paralysis. On evaluation, distal RTA was diagnosed. Further evaluation showed positive SS-a/SS-b antibodies in high titer, which confirms the diagnosis of primary SS. Our report illustrates that SS is a rare but important cause of hypokalemic paralysis.

Résumé syndrome de Sjogren (SS) est une maladie auto-immune systémique avec une atteinte prédominante des glandes exocrines entraînant des symptômes de sicca. Parmi manifestations extraglandulaires, la maladie rénale est la plus courante. La néphrite interstitielle tubulaire et l'acidose tubulaire rénale (RTA) sont les présentations. Une hypokaliémie légère associée à un RTA distal est courante dans les SS, cependant, une hypokaliémie sévère provoquant une paralysie est inhabituelle. Nous rapportons le cas d'une femme de 26 ans qui présentait une paralysie hypokaliémique. À l'évaluation, un RTA distal a été diagnostiqué. Plus loin l'évaluation a montré des anticorps SS-a / SS-b positifs à titre élevé, ce qui confirme le diagnostic de SS primaire. Notre rapport montre que SS est un cause rare mais importante de paralysie hypokaliémique.

[Therapy of chronic metabolic acidosis among diabetologist]. / Die Therapie der chronischen metabolischen Azidose im diabetologischen Umfeld.

BACKGROUND: Chronic metabolic acidosis (CMA) is a common complication of chronic kidney disease (CKD). Its treatment in patients with diabetes mellitus and CKD could also improve insulin resistance. We investigated the current therapeutic approaches in diabetes mellitus (DM) with CKD in a survey among diabetologic specialists and general practitioners with additional qualification in diabetology about their approach to CMA and cooperation with nephrologists. METHODS: 5863 practitioners were invited to complete a 27 item survey. 97 completed surveys were analysed descriptively. RESULTS: Most participants were internists with additional qualification in diabetology (46 %). They cared for median 50 (10; 112) patients with DM type I and 210 (100; 450) patients with diabetes m, type II per quarter. CMA was observed by 12 % of practitioners during the last 12 months in median 4 (2; 6) patients with DM type I and 10 (3; 30) with type II. CMA was mainly diagnosed via serum bicarbonate (28 %) or base excess (20 %). 39 % received a recommendation from the nephrologic colleagues about treatment of CMA. About one third of diabetologists rated this recommendation as highly relevant (29 %) and feasible (27 %). For treatment of CMA, oral bicarbonate is preferred (39 %). Most participants preferred their nephrological colleagues doing specialist diagnostics (90 %) including blood gas analysis, as well as taking care of the treatment of CMA (62 %) and anemia (53 %). 34 % had not treated CMA in their practice so far. The cooperation between the participants and nephrologists was evaluated good (81 %). Most participants (78 %) would appreciate further education with a focus on CMA. DISCUSSION: Cooperation between diabetologists and nephrologists works well. Nephrologists are mainly responsible for diagnosis and treatment of CMA. However, because CMA may worsen insulin resistance, its relevance for DM treatment appears to be underestimated. Further education may be required in this field.

Intradialytic acid-base changes and organic anion production during high versus low bicarbonate hemodialysis.

The use of high dialysate bicarbonate for hemodialysis in end-stage renal disease is associated with increased mortality, but potential physiological mediators are poorly understood. Alkalinization due to high dialysate bicarbonate may stimulate organic acid generation, which could lead to poor outcomes. Using measurements of ß-hydroxybutyrate (BHB) and lactate, we quantified organic anion (OA) balance in two single-arm studies comparing high and low bicarbonate prescriptions. In study 1 (n = 10), patients became alkalemic using 37 meq/L dialysate bicarbonate; in contrast, with the use of 27 meq/L dialysate, net bicarbonate loss occurred and blood bicarbonate decreased. Total OA losses were not higher with 37 meq/L dialysate bicarbonate (50.9 vs. 49.1 meq using 27 meq/L, P = 0.66); serum BHB increased in both treatments similarly (P = 0.27); and blood lactate was only slightly higher with the use of 37 meq/L dialysate (P = 0.048), differing by 0.2 meq/L at the end of hemodialysis. In study 2 (n = 7), patients achieved steady state on two bicarbonate prescriptions: they were significantly more acidemic when dialyzed against a 30 meq/L bicarbonate dialysate compared with 35 meq/L and, as in study 1, became alkalemic when dialyzed against the higher bicarbonate dialysate. OA losses were similar to those in study 1 and again did not differ between treatments (38.9 vs. 43.5 meq, P = 0.42). Finally, free fatty acid levels increased throughout hemodialysis and correlated with the change in serum BHB (r = 0.81, P < 0.001), implicating upregulation of lipolysis as the mechanism for increased ketone production. In conclusion, lowering dialysate bicarbonate does not meaningfully reduce organic acid generation during hemodialysis or modify organic anion losses into dialysate.

Half Saline-Bicarbonate Solution as Intraoperative Fluid Replacement Therapy Leads to Less Acidosis and Better Early Renal Function During Deceased-Donor Transplant.

OBJECTIVES: Normal saline is the most common crystalloid solution that is used in renal transplant surgery. In this study, our aim was to determine the effects of a combination of half saline and bicarbonate versus normal saline as a routine solution. MATERIALS AND METHODS: For this double-blind random-ized clinical trial, we enrolled 100 adult patients undergoing kidney transplant. Patients were divided into 2 groups: those who received normal saline and those who received half saline and bicarbonate infusion as fluid replacement therapy during renal transplant. All patients received about 40 mL/kg of crystalloids during surgery. Serial creatinine con-centrations (primary outcomes) were compared between groups at 1, 2, 3, and 7 days after surgery. Urine output (secondary outcome) was compared between groups at recovery and at 6 and 24 hours after surgery. In addition, base excess, chloride, and sodium levels were measured before and 6 hours after surgery. Each liter of half saline-bircarbonate, which is relatively isoosmotic to human plasma, was composed of 70 mEq bicarbonate, 77 mEq chloride, and 147 mEq sodium. RESULTS: Patients who received half saline-bicarbonate had significantly lower postoperative creatinine levels at all time points than patients who received normal saline (P = .019). Serum chloride and sodium levels (P = .001) were significantly higher and base excess (P = .007) was significantly lower in the normal saline group at 6 hours after transplant. At all time points, urine output levels were significantly higher in the half saline-bicarbonate group (P = .001). CONCLUSIONS: The use of half saline-bicarbonate was associated with better early graft function compared with normal saline in the first 7 days after transplant.

Early dialysis in a rare case of combined toxic alcohols ingestion.

Ingestion of toxic alcohols (TA) typically presents with a high anion gap (AG) metabolic acidosis, and elevated osmolar gap (OG). Hemodialysis (HD) has not been recommended in early phases of intoxication with high OG and normal AG metabolic acidosis. We describe the case of a 40-year-old male who was brought to our emergency department for reported paint thinner ingestion. He was unable to protect his airway and required intubation. Blood gas showed respiratory acidosis, an initial AG, corrected by albumin of 12.75, lactic acid 5.26 mmol/L, and an OG of 170. Patient was treated with bicarbonate drip, fomepizole and emergent HD, which improved his neurologic status. Days after his admission, alcohol levels came positive for a co-ingestion of ethylene glycol, diethylene glycol, and methanol. Most of the TA are metabolized into their toxic byproducts by the enzyme alcohol dehydrogenase (ADH). The kinetics of these alcohols will be altered when there is co-ingestion of multiple substances. Moreover, early ingestions will translate in a high OG without a high AG. False elevation of lactate can occur with the ingestion of ethylene glycol due to a cross-reaction with L-lactate oxidase in the analyzer. In our case, the administration of fomepizole followed by an early HD given the poor clinical improvement, was followed by a fast recovery of the neurological status and potentially prevented renal failure. A high index of suspicion for TA ingestion should be raised when encountering an individual with lactic acidosis, high OG, and normal AG.

Enteric methane emission and digestion in dairy cows fed wheat or molasses.

The aim of this experiment was to measure enteric methane (CH4) emission and its relation with rumen digestion in dairy cows fed diets rich in 1 of the 2 carbohydrate sources, starch or sugar. The rations were based on late first-cut grass-clover silage supplemented with wheat (Wh), NaOH-treated wheat (Wh+NaOH), sugar beet molasses (Mo), or sugar beet molasses with addition of sodium bicarbonate (Mo+Bic). Wheat and molasses made up 35% of dry matter in the 2 diets with molasses and wheat, respectively. Four cows fitted with ruminal, duodenal, and ileal canulae were used in a 4 × 4 Latin square design. Nutrient digestibility was measured using chromium oxide and titanium oxide as flow markers, and emissions of CH4 and hydrogen were measured via open-circuit indirect calorimetry on 4 consecutive days. Data were analyzed using PROC MIXED of SAS (version 9.4; SAS Institute Inc., Cary, NC) with treatment and period as fixed effects and cow as random effect. Furthermore, orthogonal contrasts were calculated. The cows produced 32.5, 33.6, 36.2, and 35.1 L of CH4/kg of dry matter intake (DMI) on diets Wh, Wh+NaOH, Mo, and Mo+Bic, respectively. The emission of CH4 per day, per kilogram of DMI, and per kilogram of energy-corrected milk as well as daily hydrogen emission were higher on the Mo diet compared with the Wh diet. With the present inclusion of wheat and molasses in the diet, no effects of NaOH treatment of wheat or of sodium bicarbonate supplementation to the Mo diet could be demonstrated on CH4 emission expressed per kilogram of DMI or per kilogram of energy-corrected milk. The duodenal flow of starch was higher when wheat was treated with NaOH. Under the conditions in the present experiment, ruminal NDF digestibility was not affected by carbohydrate source, NaOH treatment of wheat, or bicarbonate supplementation. Total volatile fatty acid concentration in the rumen and the proportions of acetate and propionate were not affected by carbohydrate source, NaOH treatment of wheat, or bicarbonate supplementation. Likewise, we could not show any influence of diet on microbial protein synthesis or efficiency of microbial protein synthesis expressed as grams of microbial protein synthesis per kilogram of true rumen-digested organic matter. We concluded that CH4 emission was increased when wheat was replaced by molasses, whereas no effect of manipulating rumen fermentation by NaOH treatment of wheat or addition of bicarbonate to molasses could be found with a level of approximately 25% of dry matter from starch and sugar, respectively.

Treatment of acute rumen lactic acidosis with intravenous hypertonic sodium chloride or bicarbonate solutions followed by intraruminal water.

The effectiveness of 7% hypertonic saline solution (HSS) and 6% hypertonic bicarbonate solution (HBS) followed by intraruminal water administration for the treatment of acute rumen lactic acidosis (ARLA) has not been evaluated yet. The hypothesis of the study is that treatment with HBS causes a faster correction of imbalances and clinical recovery than treatment with HSS. ARLA was induced in six healthy mature female sheep with sucrose twice. The sheep received both treatment regimens in a cross over design. After 18 h of induction, rumen lavage was performed and IV infusion of 7% HSS (4 mL/kg BW) or 6% HBS (6.7 mL/kg BW) was done over 5 min, followed by intraruminal administration of water (8% BW). The solutions provided 4.8 mmol/kg BW of sodium. Physical and laboratory tests were performed for 168 h. Both treatments increased plasma volume. After HSS treatment, pH and HCO3- returned to baseline values at 144 h and BE at 168 h. With HBS treatment, pH returned to baseline at 24 h, and HCO3- and BE at 48 h. In both treatments, the ruminal motility and the maximum hay intake were restored at 96 and 120 h, respectively. In conclusion, administration of HSS or HBS followed by intraruminal water corrects dehydration and mild-to-moderate metabolic acidosis in sheep with ARLA. Treatment with HBS promoted a faster correction of metabolic acidosis and could be indicated for the most severe cases.

Transdermal Methanol Intoxication.

Methanol is a clear liquid with high toxicity. Methanol intoxication may result from accidental exposure, overconsumption of compounds containing methanol with suicidal intent, or following consumption of distilled and contaminated alcoholic beverages. This report describes a case of transdermal methanol intoxication, which is a rare condition. A 58-year-old woman presented with nausea, vomiting, weakness, diplopia and dizziness. On neurological examination, she only had diplopia. On physical examination, a hyperemic lesion with clear borders was found over the right knee. The patient's recent medical history revealed that four days prior to the onset of symptoms, she had covered her knee with a methanol-soaked bandage in an attempt to alleviate her knee pain. She had a high osmolar gap as well as high anion-gap metabolic acidosis (HAGMA). Methanol intoxication was suspected due to HAGMA and high osmolar gap. Serum methanol levels were subsequently measured and found to be 37.9 mg/ dL. The patient was treated with intravenous (IV) bicarbonate, IV ethyl alcohol and hemodialysis. She was discharged with no central nervous system or ophthalmologic sequelae. Methanol poisoning should be kept in mind in patients with diplopia and unexplained metabolic acidosis. Although most methanol intoxication cases occur after oral ingestion, it should be considered that methanol poisoning may occur transdermally.

Managing Chloride and Bicarbonate in the Prevention and Treatment of Acute Kidney Injury.

Intravenous crystalloid therapy is one of the most ubiquitous aspects of hospital and critical care medicine. In recent years, there has been increasing focus on the electrolyte composition, and particularly chloride content, of crystalloid solutions. This has led to increasing clinical adoption of balanced solutions, containing substrates for bicarbonate generation and consequently a lower chloride content, in place of 0.9% saline. In this article we review the physiochemical rationale for avoidance of 0.9% saline and the effects of hyperchloremic acidosis on renal physiology. Finally, we review the current evidence and rationale for use of balanced solutions greater than 0.9% saline in acutely ill patients in a variety of clinical settings, as well as considering the role for sodium bicarbonate in preventing or correcting metabolic acidosis. In conclusion, there is a strong physiological rationale for avoidance of iatrogenic hyperchloremic acidosis from 0.9% saline administration in acutely unwell patients and an association with adverse renal outcomes in several studies. However, evidence from large definitive multicenter randomized trials is not yet available to establish the dose-relationship between 0.9% saline administration and potential harm and inform us if some 0.9% saline use is acceptable or if any exposure confers harm.

Efficacy of buffered local anaesthetics in head and neck infections.

Lignocaine is one of the most commonly-used agents to anaesthetise an area preoperatively. It can, however, cause undesirable effects such as burning on injection, relatively slow onset, and unreliable, or lack of, numbness when injected into infected tissues as a result of the acidic pH of commercial preparations (the pH is between 3.5 and 7.0 compared with the physiological pH, which is between 7.35 and 7.45). The aim of this comparative study was to evaluate the efficacy of buffered local anaesthetic on infected areas by altering the pH with 8.4% sodium bicarbonate, to measure the pain before and after the injection, and to record the time of onset of anaesthesia. All 60 patients were given 2% lignocaine hydrochloride with adrenaline 1:80,000 and 30 patients were randomly allocated to have 10:1 dilution of 8.4% sodium bicarbonate (study group). Pain was assessed on a visual analogue scale and a verbal rating scale. There was a significant difference in the amount of pain between control and study groups (p=0.025). The mean (SD) time (minutes) to onset of local anaesthesia in the study group was 1.06 (0.25) compared with 2.96 (0.81) in the control group (p<0.001). Our results confirm the efficacy of the buffered local anaesthetic solution in reducing pain on injection and resulting in quicker onset of anaesthesia. Increasing the pH of lignocaine solutions with bicarbonate immediately before use, therefore, should be considered when treating various acute infections of the head and neck.

Rabdomiólisis y antipsicóticos / Rhabdomyolysis and antipsychotics

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