POSITIVE SKIN TEST CONTROL-HISTAMINE

Large doses of histamine may precipitate systemic reactions. These reactions may include flushing, dizziness, headache, bronchial constriction, urticaria, asthma, marked hypotension or hypertension, abdominal cramps, vomiting, metallic taste, local or generalized allergic manifestations.

M. V. to prevent or ameliorate systemic reactions to the drug. If a systemic or anaphylactic reaction does occur, apply a tourniquet above the site of injection and inject epinephrine following current recommended guidelines for anaphylaxis treatment, or following epinephrine autoinjector instructions if one is being used.

Loosen the tourniquet at least every 10 minutes. Do not obstruct arterial blood flow with the tourniquet. 5 mg should be injected. Repeat in 5 to 10 minutes if necessary. 01 mg per kg body weight. 3 mg. Doses may be repeated as frequently as every 20 minutes, depending on the severity of the condition and the response of the patient.

After administration of epinephrine, profound shock or vasomotor collapse should be treated with intravenous fluids, and possibly vasoactive drugs. Oxygen should be given by mask. Aminophylline (or other bronchodilator, as appropriate), may be used if necessary after adequate epinephrine and circulatory support has been given.

Emergency resuscitation measures and personnel trained in their use should be available immediately in the event of a serious systemic or anaphylactic reaction not responsive to the above measures (Ref. J. ALLERGY AND CLINICAL IMMUNOLOGY 77 (2): p.

16 Rarely are all of the above measures necessary, the tourniquet and epinephrine usually producing prompt responses. However, the physician should be prepared in advance for all contingencies. Promptness in beginning emergency treatment measures is of utmost importance.

gov/medwatch-fda- safety-information-and-adverse-event-reporting- program. A voluntary adverse event reporting system for health professionals is available through Health Canada’s Canada Vigilance Program. html) or by calling a Canada Vigilance Regional Office toll-free at 1-866-234-2345.

SYMPTOMS AND TREATMENT OF OVERDOSAGE Overdosage may cause severe symptoms, including circulatory collapse, shock, and even death. 1,2,3 See ADVERSE REACTIONS Section for emergency treatment steps. DOSAGE AND ADMINISTRATION (1) General Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit.

Prior to testing, clean the skin area with ether or alcohol and allow to dry. The back or the volar surface of the arms are the most satisfactory sites for testing. Skin of the posterior thighs or abdomen may be used if necessary. Avoid very hairy areas where possible, since the reactions will be smaller and more difficult to interpret there.

5 cm from the spinal column, and from the top of the scapula to the lower rib margins. 5 or 5 cm above the wrist, skipping the anti-cubital space. The histamine test should be applied in the same test area as other allergenic extracts tests, but spaced no closer than 4 to 5 cm from adjacent test sites.

Use the same technique or procedure that you use for allergen testing. , 50% glycerin, Sterile Albumin Saline with Phenol, Sterile Buffered Saline with Phenol). With each skin testing method, in order for the reaction to Positive Skin Test Control-Histamine (6 mg/mL Histamine Base) to be considered valid, erythema must be present which exceeds the respective negative control by 4 mm (ƩE).

A wheal reaction does not have to be elicited unless there is a wheal reaction to the respective negative control. In this case, the wheal of the positive control must exceed the negative control by 4 mm (ƩW) in order to be considered appropriate.

Record measurement of erythema and wheal diameters. Tables 1 and 2 summarize skin testing results with histamine base and controls in atopic and non-atopic subjects using four different devices and methods. (2) Scratch, Prick or Puncture Test: Positive Skin Test Control - Histamine, 6 mg/mL Histamine Base.

The Scratch, Prick or Puncture test should be read in 15 minutes. If a large wheal reaction occurs before that time, wipe excess histamine solution from test site. a) Use a sterile scarifier for each patient. Hold the scarifier between the thumb and index finger, press the sharp edge of the instrument against the skin and twirl instrument rapidly.

The scratch should disrupt the outer layers of epidermis down to the germinal layer, but should not produce immediate oozing of blood. The amount of pressure needed to produce a satisfactory scratch will vary between patients according to the thickness or fragility of their skin.

Apply one drop of Positive Skin Test Control - Histamine to the scratch test site. b) Prick or Puncture Test: Prick tests are performed by placing a drop of extract on the skin and piercing through the drop into the skin with a slight lifting motion.

Puncture tests are […]