Effect of methylene blue used as medical dye on blood pressure in a dog undergoing partial pancreatectomy

2021 ◽  
Author(s):  
Giorgia Anna Marchese ◽  
Manuela Pascal
Keyword(s):  
Blood Pressure ◽  
Methylene Blue ◽  
Partial Pancreatectomy

Effects of Methylene Blue on Blood Pressure and Reactivity to Norepinephrine in Endotoxemic Rats

1993 ◽  
Vol 21 (6) ◽  
pp. 926-930 ◽  
Author(s):  
Dominique Paya ◽  
Gillian A. Gray ◽  
Jean-Claude Stoclet
Keyword(s):  
Blood Pressure ◽  
Methylene Blue

scholarly journals Tolerability of a single IV administration of a methylene blue challenge in patients with bipolar disorder: preliminary data from a pharmaco-MRI study

BJPsych Open ◽  
2021 ◽  
Vol 7 (S1) ◽  
pp. S289-S289
Author(s):  
Harriet Sharp ◽  
Alfonso Russo ◽  
Alessandro Colasanti ◽  
Antonello Pinna ◽  
Prince Nwaubani ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Methylene Blue ◽  
Side Effects ◽  
Energy Levels ◽  
Subjective Effects ◽  
Bipolar Affective Disorder ◽  
Small Sample ◽  
Common Side Effect ◽  
Tolerability Profile ◽  
Infusion Site

AimsTo summarise the tolerability profile following an infusion of methylene blue (MB), including subjective effects on mood and energy levels and haemodynamic changes, in patients with Bipolar Affective Disorder (BPAD).BackgroundBPAD is associated with mitochondrial dysfunction and impaired cellular energy production. MB is proposed to enhance mitochondria function via rerouting electrons and intracellular reduction of oxidative stress, and is therefore a candidate compound for use as a probe to reveal alterations in brain oxygen metabolism in vivo in patients with BPAD. Although there are reports of MB used as treatment for BPAD, the tolerability and subjective effects of a single IV dose in this population has not yet been defined.MethodUsing a single-blind, randomised, within-subject design, 7 patients with BPAD on stable pharmacological treatment and 6 healthy controls (HCs) received an infusion of 0.5mg/kg MB and a placebo glucose solution one week apart. Visual Analogue Scales (VAS) assessing ‘Mood’ and ‘Energy’ levels were completed by 11 participants, and blood pressure (BP), heart rate (HR) and any subsequent side effects were recorded before and after infusions.ResultA significant, albeit very small, effect of MB on ‘Mood’ levels relative to placebo was demonstrated, independent of groups (change relative to baseline: 5.5% ± 11 increase (placebo) vs -1.6 % ± 9.5 reduction (MB); p = 0.027). Although there was no effect of MB on energy levels in either group, there appeared to be a trend for a general group difference in ‘Energy’ levels across all trials, with lower ratings in BPAD patients (p = 0.058).There was a trend for significantly lower post-infusion HR relative to pre-infusion (-6.4 ± 8.8 bpm, p = 0.07. Diastolic BP was higher (3.0 ± 7.8mmHg, p = 0.039). These effects were independent of groups and drug. The most common side effect with MB was mild/moderate pain at infusion site (n = 10/13), resolving within median 32.5 minutes (IQR 6-102), and discoloured urine in 7/13 subjects lasting median 44.5 hours (IQR 36-59). No difference in frequency of side effects reported between groups.ConclusionAlthough limited by small sample size, this tolerability analysis demonstrates a acceptable profile of effects of MB on subjective ratings and blood pressure, in both BPAD and HCs. Common side effects of discoloured urine and pain at infusion site are in line with previous reports in the literature. We observed a small effect of MB on mood ratings which could be related to the discomfort experienced during infusion.

Effect of Methylene Blue on Blood Pressure in Rats

1993 ◽  
Vol 39 (6) ◽  
pp. 320
Author(s):  
S. OKTAY ◽  
F. ONAT ◽  
F. KARAHAN ◽  
I. ALICAN ◽  
U. OZKUTLU
Keyword(s):  
Blood Pressure ◽  
Methylene Blue

Effect of Methylene Blue on Blood Pressure in Rats

Pharmacology ◽  
1993 ◽  
Vol 46 (4) ◽  
pp. 206-210 ◽  
Author(s):  
Side Oktay ◽  
Filiz Onat ◽  
Funda Karahan ◽  
Inci Alica ◽  
Uğur Özkutlu ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Methylene Blue

scholarly journals Methylene blue reduces peritoneal adhesions in Syrian golden hamsters that undergo hepatopancreatic surgical procedures

2021 ◽  
Vol 9 (05) ◽  
Author(s):  
Cintia Yoko Morioka ◽  
Marcel Cerqueira Cesar Machado ◽  
Jose Pinhata Otoch ◽  
Seiji Saito ◽  
Joelmir Lucena Veiga da Silva ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Surgical Procedures ◽  
Adhesion Formation ◽  
Sham Operation ◽  
Peritoneal Adhesions ◽  
Partial Pancreatectomy ◽  
Tissue Ischemia ◽  
Golden Hamsters ◽  
Loss Of Weight ◽  
Syrian Golden Hamsters

Tissue ischemia, mechanical or thermal trauma, infection and foreign body reaction predispose to adhesion formation. Adhesion formation resembles an inflammatory process. Sometimes, they appear as a bridge to wound healing, however, in other times it may cause small bowel obstruction. Methylene blue is known to inhibit the generation of oxygen radicals. Therefore, it may be used as an antioxidant reducing adhesion formation. Hamsters are animals used in surgical experiments, including pancreatic and hepatic surgeries.  Objective. To study the effectiveness of using methylene blue in hamsters that undergo hepatectomy or pancreatectomy.  Methods. Syrian golden hamsters were divided in 6 groups: Partial pancreatectomy with splenectomy (PPS), PPS and MB (PPS-MB), Partial hepatectomy (PH), PH and MB (PH-MB), Sham operation (SO), and Sham operation and MB (SO-MB). MB was administered intraperitoneally before closing abdominal wall. Side effects were observed. Animals were sacrificed 10 days later and adhesions were quantified.  Results. Adhesions were present in all animals (100%) of PH group and 3 of 5 (60%) of PPS group. In PH-MB and SO groups, 1 of 5 hamsters (20%) in each group showed adhesions. No adhesions were found in PPS-MB and SO-MB treated groups. None of animals showed loss of weight.  Conclusion. This study suggests that methylene blue administration showed to be effective to prevent adhesion formation in hepatopancreatic surgical procedures.

Methylene blue versus vasopressin analog for refractory septic shock in the preterm neonate: A randomized controlled trial

2021 ◽  
pp. 1-9
Author(s):  
R. Ismail ◽  
H. Awad ◽  
R. Allam ◽  
O. Youssef ◽  
M. Ibrahim ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Septic Shock ◽  
Methylene Blue ◽  
Randomized Controlled Trial ◽  
Side Effects ◽  
Preterm Neonate ◽  
Controlled Trial ◽  
Randomized Controlled ◽  
Arterial Blood ◽  
Refractory Septic Shock

BACKGROUND: Refractory septic shock in neonates is still associated with high mortality, necessitating an alternative therapy, despite all currently available treatments. This study aims to assess the vasopressor effect of methylene blue (MB) in comparison to terlipressin (TP) as adjuvant therapy for refractory septic shock in the preterm neonate. METHODS: A double-blinded randomized controlled trial was conducted in the Neonatal Intensive Care Units at Ain Shams University, Egypt. Thirty preterm neonates with refractory septic shock were randomized to receive either MB or TP as an adjuvant to conventional therapy. Both MB and TP were administered as an intravenous loading dose followed by continuous intravenous infusion. The hemodynamic variables, functional echocardiographic variables, and oxidant stress marker were assessed over a 24 h period together with the side effects of MB. RESULTS: MB causes significant improvement in mean arterial blood pressure with a significant decrease of the norepinephrine requirements (1.15±0.21μm/kg/min at baseline vs. 0.55±0.15μm/kg/min at 24 h). MB infusion causes an increase of the pulmonary pressure (44.73±8.53 mmHg at baseline vs. 47.27±7.91 mmHg after 24 h) without affecting the cardiac output. Serum malonaldehyde decreased from 5.45±1.30 nmol/mL at baseline to 4.40±0.90 nmol/mL at 24 h in the MB group. CONCLUSION: Administration of MB to preterm infants with refractory septic shock showed rapid increases in systemic vascular resistance and arterial blood pressure with minimal side effects.

scholarly journals Methylene blue treatment of pediatric patients in the cardiovascular intensive care unit

2021 ◽  
Vol 23 (1) ◽  
pp. 8-17
Author(s):  
Ashley Scheffer ◽  
Keyword(s):  
Blood Pressure ◽  
Methylene Blue ◽  
Arterial Blood Pressure ◽  
Mean Arterial Blood Pressure ◽  
Congenital Heart ◽  
Pediatric Patients ◽  
Mixed Effects ◽  
Arterial Blood ◽  
Blood Pressures ◽  
One Year

Background: In both adults and children, hypotension related to a vasoplegic state has multiple etiologies, including septic shock, burn injury or cardiopulmonary bypass-induced vasoplegic syndrome likely due to an increase in nitric oxide (NO) within the vasculature. Methylene blue is used at times to treat this condition, but its use in pediatric cardiac patients has not been described previously in the literature. Objective: 1) Analyze the mean arterial blood pressures and vasoactive-inotropic scores of pediatric patients whose hypotension was treated with methylene blue compared to hypotensive controls; 2) Describe the dose administered and the pathologies of hypotension cited for methylene blue use; 3) Compare the morbidity and mortality of pediatric patients treated with methylene blue versus controls. Design: A retrospective chart review. Setting: Cardiac ICU in a quaternary care free-standing children’s hospital. Patients: Thirty-two patients with congenital heart disease who received methylene blue as treatment for hypotension, fifty patients with congenital heart disease identified as controls. Interventions: None. Measurements and Main Results: Demographic and vital sign data was collected for all pediatric patients treated with methylene blue during a three-year study period. Mixed effects linear regression models analyzed mean arterial blood pressure trends for twelve hours post methylene blue treatment and vasoactive-inotropic scores for twenty-four hours post treatment. Methylene blue use correlated with an increase in mean arterial blood pressure of 10.8mm Hg over a twelve-hour period (p< 0.001). Mean arterial blood pressure trends of patients older than one year did not differ significantly from controls (p=1.00), but patients less than or equal to one year of age had increasing mean arterial blood pressures that were significantly different from controls (p=0.02). Mixed effects linear regression modeling found a statistically significant decrease in vasoactive-inotropic scores over a twenty-four-hour period in the group treated with methylene blue (p< 0.001). This difference remained significant comparted to controls (p=0.003). Survival estimates did not detect a difference between the two groups (p=0.39). Conclusion: Methylene blue may be associated with a decreased need for vasoactive-inotropic support and may correlate with an increase in mean arterial blood pressure in patients who are less than or equal to one year of age.

A SEM and Light Microscope Study of the Epidermal Leaf Structures of the Carnivorous Plant, Sarracenia purpurea, L.

1971 ◽  
Vol 29 ◽  
pp. 358-359
Author(s):  
B. J. Panessa ◽  
J. F. Gennaro
Keyword(s):  
Methylene Blue ◽  
Toluidine Blue ◽  
Outer Surface ◽  
Microscope Study ◽  
Light Microscope ◽  
Carnivorous Plant ◽  
Sarracenia Purpurea ◽  
Inner Surface

Tissue from the hood and sarcophagus regions were fixed in 6% glutaraldehyde in 1 M.cacodylate buffer and washed in buffer. Tissue for SEM was partially dried, attached to aluminium targets with silver conducting paint, carbon-gold coated(100-500Å), and examined in a Kent Cambridge Stereoscan S4. Tissue for the light microscope was post fixed in 1% aqueous OsO4, dehydrated in acetone (4°C), embedded in Epon 812 and sectioned at ½u on a Sorvall MT 2 ultramicrotome. Cross and longitudinal sections were cut and stained with PAS, 0.5% toluidine blue and 1% azure II-methylene blue. Measurements were made from both SEM and Light micrographs.The tissue had two structurally distinct surfaces, an outer surface with small (225-500 µ) pubescent hairs (12/mm2), numerous stoma (77/mm2), and nectar glands(8/mm2); and an inner surface with large (784-1000 µ)stiff hairs(4/mm2), fewer stoma (46/mm2) and larger, more complex glands(16/mm2), presumably of a digestive nature.

Evaluation of two methods of teaching blood pressure measurement

1988 ◽  
Vol 52 (9) ◽  
pp. 519-521
Author(s):  
NK Nordstrom ◽  
S Longenecker ◽  
HL Whitacre ◽  
FM Beck
Keyword(s):  
Blood Pressure ◽  
Pressure Measurement ◽  
Blood Pressure Measurement
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