Tham
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Questions & Answers
Side Effects & Adverse Reactions
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Large doses of Tham Solution may depress ventilation, as a result of increased blood pH and reduced CO2 concentration. Thus, dosage should be adjusted so that blood pH is not allowed to increase above normal. In situations in which respiratory acidosis may be present concomitantly with metabolic acidosis, the drug may be used with mechanical assistance to ventilation.
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Care must be exercised to prevent perivascular infiltration since this can cause inflammation, necrosis and sloughing of tissue. Venospasm and intravenous thrombosis, which may occur during infusion, can be minimized by insuring that the injection needle is well within the largest available vein and that solutions are slowly infused. Intravenous catheters are recommended. If perivascular infiltration occurs, institute appropriate countermeasures. See ADVERSE REACTIONS.
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Tham Solution (tromethamine injection) should be administered slowly and in amounts sufficient only to correct the existing acidosis, and to avoid overdosage and alkalosis. Overdosage in terms of total drug and/or too rapid administration, may cause hypoglycemia of a prolonged duration (several hours). Therefore, frequent blood glucose determinations should be made during and after therapy.
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Extreme care should be exercised in patients with renal disease or reduced urinary output because of potential hyperkalemia and the possibility of a decreased excretion of tromethamine. In such patients, the drug should be used cautiously with electrocardiographic monitoring and frequent serum potassium determinations.
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Because clinical experience has been limited generally to short-term use, the drug should not be administered for more than a period of one day except in a life-threatening situation.
The intravenous administration of Tham Solution can cause fluid and/or solute overloading resulting in dilution of serum electrolyte concentrations, overhydration, congested states or pulmonary edema.
Additives may be incompatible. Consult with pharmacist, if available. When introducing additives, use aseptic technique, mix thoroughly and do not store.
Legal Issues
There is currently no legal information available for this drug.
FDA Safety Alerts
There are currently no FDA safety alerts available for this drug.
Manufacturer Warnings
There is currently no manufacturer warning information available for this drug.
FDA Labeling Changes
There are currently no FDA labeling changes available for this drug.
Uses
Tham Solution (tromethamine injection) is indicated for the prevention and correction of metabolic acidosis. In the following conditions it may help to sustain vital functions and thus provide time for treatment of the primary disease:
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Metabolic Acidosis Associated with Cardiac Bypass Surgery.
Tham Solution has been found to be primarily beneficial in correcting metabolic acidosis which may occur during or immediately following cardiac bypass surgical procedures.
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Correction of Acidity of ACD Blood in Cardiac Bypass Surgery.
It is well known that ACD blood is acidic and becomes more acidic on storage. Tromethamine effectively corrects this acidity. Tham Solution may be added directly to the blood used to prime the pump-oxygenator. When ACD blood is brought to a normal pH range the patient is spared an initial acid load. Additional tromethamine may be indicated during cardiac bypass surgery should metabolic acidosis appear.
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Metabolic Acidosis Associated with Cardiac Arrest.
Acidosis is nearly always one of the consequences of cardiac arrest and, in some instances, may even be a causative factor in arrest. It is important therefore, that the correction of acidosis should be started promptly with other resuscitative efforts. By correcting acidosis, Tham Solution (tromethamine injection) has caused the arrested heart to respond to resuscitative efforts after standard methods alone had failed. In these cases, tromethamine was given intraventricularly. It is to be noted, however, that such precariously ill patients often have died subsequently of causes unrelated to the administration of tromethamine. With administration by the peripheral venous route, metabolic acidosis has been corrected in a majority of patients. The success in reinstitution of cardiac rhythm by this means probably has not been of the same order of magnitude as with the intraventricular route.
History
There is currently no drug history available for this drug.
Other Information
Tham Solution (tromethamine injection) is a sterile, non-pyrogenic 0.3 M solution of tromethamine, adjusted to a pH of approximately 8.6 with glacial acetic acid. It is administered by intravenous injection, by addition to ACD blood for priming cardiac bypass equipment and by injection into the ventricular cavity during cardiac arrest.
Each 100 mL contains tromethamine 3.6 g (30 mEq) in water for injection. The solution is hypertonic 389 mOsmol/L (calc.). pH 8.6 (8.4-8.7).
The solution contains no bacteriostat, antimicrobial agent or added buffer (except acetic acid for pH adjustment) and is intended only for use as a single-dose injection. When smaller doses are required the unused portion should be discarded.
Tham solution is a parenteral systemic alkalizer and fluid replenisher.
Tromethamine, USP (sometimes called “tris” or “tris buffer”) is chemically designated 2-amino-2-(hydroxymethyl)-1, 3-propanediol, a solid readily soluble in water, also classified as an organic amine buffer. It has the following structural formula:
Water for Injection, USP is chemically designated H20.
Sources
Tham Manufacturers
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Hospira, Inc.
![Tham (Tromethamine) Injection, Solution [Hospira, Inc.]](/wp-content/themes/bootstrap/assets/img/loading2.gif)
Tham | Hospira, Inc.
Tham Solution (tromethamine injection) is administered by slow intravenous infusion, by addition to pump-oxygenator ACD blood or other priming fluid or by injection into the ventricular cavity during cardiac arrest. For infusion by peripheral vein, a large needle should be used in the largest antecubital vein or an indwelling catheter placed in a large vein of an elevated limb to minimize chemical irritation of the alkaline solution during infusion. Catheters are recommended.
Dosage and rate of administration should be carefully supervised to avoid overtreatment (alkalosis). Pretreatment and subsequent determinations of blood values (e.g. pH, PCO2, PO2, glucose and electrolytes) and urinary output should be made as necessary to monitor dosage and progress of treatment. In general, dosage should be limited to an amount sufficient to increase blood pH to normal limits (7.35 to 7.45) and to correct acid-base derangements. The total quantity to be administered during the period of illness will depend upon the severity and progression of the acidosis. The possibility of some retention of tromethamine, especially in patients with impaired renal function, should be kept in mind.
The intravenous dosage of Tham Solution (tromethamine injection) may be estimated from the buffer base deficit of the extracellular fluid in mEq/liter determined by means of the Siggaard-Andersen nomogram. The following formula is intended as a general guide:
Tham Solution (mL of 0.3 M) Required =
Body Weight (kg) X
Base Deficit (mEq/liter) X 1.1*
Thus, a 70 kg patient with a buffer base deficit (“negative base excess”) of 5 mEq/liter would require 70 x 5 x 1.1 = 385 mL of Tham Solution containing 13.9 g (115 mEq) of tromethamine. The need for administration of additional Tham Solution is determined by serial determinations of the existing base deficit.
* Factor of 1.1 accounts for an approximate reduction of 10% in buffering capacity due to the presence of sufficient acetic acid to lower pH of the 0.3 M solution to approximately 8.6.
Correction of Metabolic Acidosis Associated with Cardiac Bypass Surgery: An adverse dose of approximately 9.0 mL/kg (324 mg/kg) has been used in clinical studies with Tham Solution (tromethamine injection). This is equivalent to a total dose of 630 mL (189 mEq) for 70 kg patient. A total single dose of 500 mL (150 mEq) is considered adequate for most adults. Larger single doses (up to 1000 mL) may be required in unusually severe cases.
It is recommended that individual doses should not exceed 500 mg/kg (227 mg/lb) over a period of not less than one hour. Thus, for a 70 kg (154 pound) patient the dose should not exceed a maximum of 35 g per hour (1078 mL of a 0.3 M solution). Repeated determinations of pH and other clinical observations should be used as a guide to the need for repeat doses.
Correction of Acidity of ACD Blood in Cardiac Bypass Surgery: The pH of stored blood ranges from 6.80 to 6.22 depending upon the duration of storage. The amount of Tham Solution used to correct this acidity ranges from 0.5 to 2.5 g (15 to 77 mL of a 0.3 M solution) added to each 500 mL of ACD blood used for priming the pump-oxygenator. Clinical experience indicates that 2 g (62 mL of a 0.3 M solution) added to 500 mL of ACD blood is usually adequate.
Correction of Metabolic Acidosis Associated with Cardiac Arrest: In the treatment of cardiac arrest, Tham Solution should be given at the same time that other standard resuscitative measures, including manual systole, are being applied. If the chest is open, Tham Solution is injected directly into the ventricular cavity. From 2 to 6 g (62 to 185 mL of a 0.3 M solution) should be injected immediately. Do not inject into the cardiac muscle.
If the chest is not open, from 3.6 to 10.8 g (111 to 333 mL of a 0.3 M solution) should be injected immediately into a larger peripheral vein. Additional amounts may be required to control acidosis persisting after cardiac arrest is reversed.
Correction of Metabolic Acidosis Associated with RDS in Neonates and Infants: The initial dose of Tham Solution should be based on initial pH and birthweight amounting to approximately 1 mL per kg for each pH unit below 7.4. Further doses have been given according to changes in PaO2, pH and PCO2.
Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. See CONTRAINDICATIONS.
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