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Injections, Subcutaneous: Forceful administration under the skin of liquid medication, nutrient, or other fluid through a hollow needle piercing the skin.

Preparing and Administering Subcutaneous Medications

JoVE 10234

Source: Madeline Lassche, MSNEd, RN and Katie Baraki, MSN, RN, College of Nursing, University of Utah, UT

Subcutaneous medication administration is a parenteral approach to administer small amounts of medication (less than 2 mL) into the layer of tissue just below the skin. Common medications administered via the subcutaneous route include anticoagulant medications, such as heparin or enoxaparin; epinephrine administered for allergic reactions; insulin; and some immunizations. Subcutaneous injection preparations are commonly provided in vials or ampules for withdrawal into a subcutaneous syringe. Subcutaneous needles have a shorter length and smaller diameter than syringes used for intramuscular injections, are typically less than 5/8th of an inch, and are 26 gauge or smaller. Medication absorption and onset is slower than for intravenous routes, with some absorption rates lasting 24 h or longer. This approach is selected for many medications that may be denatured or deactivated if given via the oral route, given the acidity of the gastrointestinal tract. Subcutaneous injection preparations are commonly provided in vials or ampules for withdrawal into a subcutaneous syringe. The nurse should determine the appropriate medication dose according to


 Nursing Skills

Compound Administration I

JoVE 10198

Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN

As many research protocols require that a substance be injected into an animal, the route of delivery and the amount of the substance must be accurately determined. There are several routes of administration available in the mouse and rat. Which route to use is determined by several factors of the substance to be injected: the pH of the solution, the volume required for the desired dosage, and the viscosity of the solution. Severe tissue damage can occur if a substance is administered incorrectly. This video looks at the various restraint methods and technical details for the most commonly used injection routes.


 Lab Animal Research

Rodent Handling and Restraint Techniques

JoVE 10221

Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN 

It has been demonstrated that even minimal handling of mice and rats is stressful to the animals. Handling for cage changing and other noninvasive procedures causes an increase in heart rate, blood pressure, and other physiological parameters, such as serum corticosterone levels. Fluctuations can continue for up to several hours. The methods of restraint required for injections and blood withdrawals also cause physiological changes that can potentially affect scientific data. Training in the proper handling of mice and rats is required to minimize the effects to the animals.1 Mice and rats can be restrained manually with restraint devices, or with chemical agents. Manual methods and the use of restraint devices are covered in this manuscript. All restraint methods include the process of lifting the animals from their home cage.


 Lab Animal Research

Preparing and Administering Intramuscular Injections

JoVE 10261

Source: Madeline Lassche, MSNEd, RN and Katie Baraki, MSN, RN, College of Nursing, University of Utah, UT

Intramuscular (IM) injections deposit medications deep into the muscle tissue. Since muscle fibers are well perfused, this route of administration provides quick uptake of the medication and allows for the administration of relatively large volumes. Skeletal muscles have fewer pain-sensing nerves than subcutaneous tissue, which allows for the less painful administration of irritating drugs (e.g., chlorpromazine, an anti-psychotic). IM injections are recommended for patients unable to take oral medications and for uncooperative patients. Some examples of medications that are commonly delivered by IM injections include antibiotics, hormones, and vaccinations. As in any other route of administration, the nurse must consider if the medication is appropriate, given the patient's medical conditions, allergies, and current clinical status. In addition, specifically for IM injections, it is important to assess the patient's muscle mass to determine the appropriate needle size. Also, if the patient has already received this injection, it is necessary to verify the injection site that was previously used and to ensure that the previous dose did not result in any adverse


 Nursing Skills

In Vivo Model for Testing Effect of Hypoxia on Tumor Metastasis

1Department of Biochemistry and Molecular & Cellular Biology, Georgetown University Medical Center, 2Department of Nursing, Georgetown University, School of Nursing and Health Studies, 3Department of Human Science, Georgetown University, School of Nursing and Health Studies, 4School of Medicine, Georgetown University Medical Center, 5Department of Pathology and Neuropathology, Medical University of Gdańsk, 6Department of Oncology, Georgetown University Medical Center, 7Department of Pathology, Georgetown University Medical Center

JoVE 54532


 Cancer Research

Using In Vivo and Tissue and Cell Explant Approaches to Study the Morphogenesis and Pathogenesis of the Embryonic and Perinatal Aorta

1Yale Cardiovascular Research Center, Section of Cardiovascular Medicine, Department of Internal Medicine, Yale University School of Medicine, 2Department of Neurology, Yale University School of Medicine, 3Department of Neurology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine

JoVE 56039


 Developmental Biology

Compound Administration III

JoVE 10215

Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN

There are many commonly used routes for compound administration in laboratory mice and rats. However, certain protocols may require the use of less commonly used routes, including intradermal, intranasal, and intracranial injections. Specialized training is essential for these procedures to be performed successfully. Justification for these routes may need to be provided to gain Institutional Animal Care and Use Committee (IACUC) approval.


 Lab Animal Research

Production and Administration of Therapeutic Mesenchymal Stem/Stromal Cell (MSC) Spheroids Primed in 3-D Cultures Under Xeno-free Conditions

1Department of Biology, University of Mary Hardin-Baylor, 2Department of Pediatrics, University of Texas Medical Branch, 3Multi-Organ Support Technology Task Area, U.S. Army Institute of Surgical Research, 4Internal Medicine, Texas A&M University Health Science Center

JoVE 55126


 Developmental Biology

Gene Regulation and Targeted Therapy in Gastric Cancer Peritoneal Metastasis: Radiological Findings from Dual Energy CT and PET/CT

1Department of Radiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, 2Department of Nuclear Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, 3GE Healthcare China, 4Department of Surgery, Cedars-Sinai Medical Center

Video Coming Soon

JoVE 56526


 JoVE In-Press

Compound Administration IV

JoVE 10214

Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN

There are many commonly used routes for compound administration in laboratory mice and rats. Protocols may, however, require the use of the less commonly used routes: intracardiac, footpad, and retro-orbital injections. Specialized training is essential for these procedures to be performed successfully. Justification for these routes may need to be provided to gain Institutional Animal Care and Use Committee (IACUC) approval.


 Lab Animal Research

Gene Transfection toward Spheroid Cells on Micropatterned Culture Plates for Genetically-modified Cell Transplantation

1Graduate School of Medicine, Laboratory of Clinical Biotechnology, The University of Tokyo, 2Graduate School of Engineering, Department of Materials Engineering, The University of Tokyo, 3Graduate School of Engineering, Department of Bioengineering, The University of Tokyo

JoVE 52384


 Bioengineering

Ultrasound-guided Botulinum Toxin-A Injections: A Method of Treating Sialorrhea

1Clinical and Biological Sciences Department, Neurology Unit, University of Torino, San Luigi Gonzaga Hospital, 2Oncology Department, Radiology Unit, University of Torino, San Luigi Gonzaga Hospital, 3Clinical and Biological Sciences Department, Dietologic and Nutrition Unit, University of Torino, San Luigi Gonzaga Hospital

JoVE 54606


 Medicine

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