Anesthesia General

Delayed Hemolytic reactions and Acute Hemolytic reactions

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Hemolytic Reactions Hemolytic reactions can be: Acute Hemolytic reactions Delayed Hemolytic reactions: The Delayed Hemolytic reactions are seen after a few days of blood transfusion. Acute hemolytic reactions It is usually due to ABO incompatibility (mismatch reaction). The most common cause of these transfusion reactions is clerical error. There is intravascular hemolysis. Incidence is […]

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Unstable Tachycardias – narrow complex and wide complex tachycardias

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Unstable tachycardias can be manifested by chest pain, shortness of breath, decreased urine output, mental status changes, or hypotension. The assessment of a patient with a tachycardia requires a systematic approach. First, the physician must determine whether the patient is experiencing evidence of hemodynamic compromise as a result of the tachycardia, which is generally not

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Physical properties of carbon dioxide

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Carbon dioxide was discovered by Von Helmont and was isolated by Joseph Black in 1757. Physical properties of carbon dioxide were shown by Yandell Henderson in 1925 and J S Haldane in 1926. It was frequently used to stimulate respiration and there was provision for carbon dioxide cylinders on old Boyle’s machines. The physical properties of

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Oxygen Partial Pressure

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Oxygen partial pressure decreases to 100 mm Hg up to alveoli. Oxygen tension in venous blood is 40 mm Hg. About one-fifth (20.9%) of air contains oxygen. In the inspired air, oxygen has partial pressure at 1/5 of the atmospheric pressure, i.e., 159 mm Hg. The larger the O2 or CO2 tension difference between the

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Delirium tremens

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Withdrawal from alcohol is a serious and common complication associated with hospitalization that can result in the condition known as delirium tremens. Many patients who consume alcohol cease drinking on or prior to admission for both voluntary and involuntary reasons. A patient does not need to be an alcoholic by medical definition to be at

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Dural tear

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Dural tear is a known complication of spinal surgeries, such as laminectomies, spinal fusions, and disc excisions. It most commonly occurs in the lumbar region. In general, the tear is noted at the time of operation when leakage of cerebrospinal fluid (CSF) is noted by the surgeon. A tear in the dura results in decompression

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Oxygen Toxicity

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Oxygen Toxicity occurs when excessive oxygen inhalation is done as in prolonged ventilation with hundred percent (100%) oxygen. When the inspired oxygen saturation or FiO2 of a patient on oxygen therapy is kept for long time Toxicity of oxygen is bound can take place. FiO2 of 100 % should not be kept for more than 12

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Use of nitrogen

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Nitrogen is present in the atmosphere and it constitutes 78.08% of total air. Moreover, the use of nitrogen is growing very rapidly these days. Use of nitrogen in medicine is helpful as it can be used as diluent of oxygen in order to avoid oxygen toxicity. It is stored in either compressed air or in

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Health effects of carbon dioxide

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Common health effects of carbon dioxide include : • There is fall in peripheral vascular resistance but there is increase in mean arterial pressure. There is increase in blood flow towards skin and so more chances of oozing. • Directly it reduces contractile force of heart but indirectly increases cardiac output. It increases the sympathetic

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Autologous blood

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Autologous blood Transfusion Techniques: AutoIogous Blood The blood of a person himself is called as autologous blood. Usually, 3 to 4 units of patient’s own blood are taken 4 to 6 weeks before surgery but hematocrit should not be allowed to fall below 35% and hemoglobin less than 11 g%. The patient’s blood is transfused back

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