Summary
Highlights
Nurse Kim Sung-kyung welcomes new hospital staff and introduces the topic: understanding imaging tests and nursing care. The goal is to equip nurses with knowledge of various imaging test types, purposes, principles, and methods to ensure accurate and safe nursing care.
Esophageal fluoroscopy uses barium to visualize the esophagus. Small bowel follow-through assesses small intestine peristalsis, requiring barium and water. Upper GI series examines the esophagus, stomach, and duodenum with barium. Barium enema evaluates the large intestine by introducing barium and air rectally. These tests generally require fasting and removal of metal objects. Patient education on fluid intake after the test and monitoring for barium excretion in stool (light-colored) is important.
The history of imaging tests began in 1895 with Wilhelm Röntgen's discovery of X-rays, allowing non-invasive viewing of bones and chest. Early X-rays were used primarily in orthopedics. The 1900s saw the use of contrast agents for organ and blood vessel visualization. The 1950s introduced ultrasound and nuclear medicine. The 1970s marked the era of cross-sectional imaging with the development of CT scans (1972) and MRI (late 1970s). The 1990s brought advancements in PET scans, and currently, AI is being integrated into diagnostic imaging.
Imaging tests are broadly categorized into radiation-based tests (X-ray, CT, fluoroscopy), magnetic field and ultrasound-based tests (MRI, ultrasound), nuclear medicine tests (using radioactive pharmaceuticals), and other tests like bone density scans.
Key nursing considerations include accurate patient identification, pre-test preparations (reservations, consent, fasting, allergy checks, pregnancy status), contrast agent related checks (allergy, past reactions, kidney function), removal of metallic objects, securing IV access if contrast is used, and thorough patient education (test duration, posture, movement restrictions, anxiety management).
During the test, patient safety is paramount, including fall prevention, maintaining posture, assessing consciousness, monitoring for contrast reactions, and infection control. Post-test care involves observing for adverse reactions (rashes, dyspnea, blood pressure changes), especially after contrast use, and checking for bleeding, pain, or swelling after interventional procedures. Patient education on fluid intake (for contrast excretion) and reporting unusual symptoms is crucial, along with accurate documentation of test completion and any adverse events.
The importance of pre-test checks is highlighted by patient safety incidents during MRI scans. Examples include a patient injured by metallic objects drawn into the MRI machine and a fatality caused by an oxygen tank pulled into the scanner, underscoring the critical need to remove all metallic items.
X-rays use X-rays to evaluate body structure and function, commonly for chest, abdomen, and bones. They are quick, simple, inexpensive, and have low radiation exposure. Nurses must ensure metal objects are removed, verify pregnancy status, and guide patients on posture. Post-test, ensure unnecessary exposure is avoided, results are checked, and patients can resume normal activities.
CT scans combine X-rays and computers to create detailed cross-sectional images, offering greater clarity than X-rays. While faster than MRI, they involve more radiation. CT types include general, high-resolution, and PET-CT. Nursing care for non-contrast CT is similar to X-rays. Contrast-enhanced CT requires specific pre- and post-care.
Pre-CT care for contrast involves fasting (6+ hours for adults, 2+ for children), checking kidney function (creatinine levels), managing medications (stopping metformin 48 hours prior), checking for contrast allergies, confirming past reactions, securing IV access (20G or larger), obtaining consent, and patient education on the procedure. Post-CT, monitor for allergic reactions, encourage significant fluid intake (2+ liters for adults) to excrete contrast, and check the injection site for swelling or pain. Patients with impaired kidney function require careful fluid management.
CT scans are performed on various body parts: Head CT (for tumors, inflammation, brain hemorrhage, stroke), Chest CT (for lung parenchyma, bronchi, tumor metastasis), Abdominal CT (for digestive, hepatobiliary, urinary, kidney stones). Patients need to remain still, potentially hold their breath, and maintain specific positions. Other CT types include Spinal/Limb CT (for tumors, fractures, post-surgery evaluation) and Cardiac CT (for myocardial, valve diseases, aortic aneurysms, coronary artery assessment), often requiring vasodilation medication.
MRI uses magnetic fields and radiofrequencies to create detailed images, especially effective for soft tissues like the brain, nerves, and cartilage. It offers superior soft tissue contrast but has longer scan times and high noise levels. Strict adherence to metal removal is crucial due to strong magnetic fields. Types include Diffusion-weighted MRI and Angiography MRI.
MRI scans are done for Head and Neck (brain hemorrhages, tumors, degenerative diseases), Upper Abdomen (tumors, vascular malformations, liver), Blood Vessels (aneurysms, vascular malformations). These typically last 30-60 minutes, require a supine position, and sometimes breath-holding. Lower Abdomen, Musculoskeletal, and Spinal MRIs also have specific indications. Nurses must educate patients on posture, minimizing movement, and reporting discomfort. Crucially, all metallic objects, including implants, stents, and tattoos, must be removed or reported. Fasting may be required for abdominal/pelvic scans. Pregnancy status must be confirmed, especially avoiding the first trimester. Addressing claustrophobia and providing emotional support are also vital.
Fluoroscopic contrast exams provide real-time imaging, allowing immediate visualization during diagnosis and treatment. They use contrast agents (barium, iodine) that block X-rays to highlight organ movement and structure, distinguishing normal from abnormal tissues. These are commonly used with endoscopy, angiography, and for digestive system evaluations.
Colon transit time measurement assesses large intestine function by tracking marker excretion, typically for chronic constipation. Intravenous Pyelography (IVP) visualizes the kidneys, ureters, and bladder by injecting iodine contrast. IVP requires appointments, dietary adjustments, fasting, laxatives, and checking for contrast allergies. Post-test, encourage fluid intake for contrast excretion.
Esophageal fluoroscopy uses barium for structural assessment. Upper GI series visualizes the esophagus, stomach, and duodenum, requiring patient position changes. Small bowel follow-through monitors small intestine movement over several hours. All require fasting, metal removal, and patient education on the procedure. Post-test, encourage fluid intake and monitor for barium excretion.
Barium enema involves rectal barium and air for colon imaging, requiring appointments, dietary control, laxatives, fasting, and patient education on abdominal discomfort and position changes. Colon transit time requires patients to maintain usual diet but avoid laxatives. IVP requires appointments, diet control, fasting, laxatives, and checking for contrast allergies. Post-tests for all involve monitoring for barium excretion and encouraging fluid intake.
Angiography assesses blood vessel structure and blood flow by injecting contrast agents into vessels, visualized with X-ray, CT, or MRI. It helps diagnose vascular diseases (aneurysms, blockages, clots), guides endovascular procedures (stent insertion), and can be therapeutic (clot removal). Nursing considerations include checking for contrast allergies, kidney function, bleeding tendencies, ensuring hemostasis at the puncture site, and encouraging fluid intake.
CAG is a common procedure for diagnosing coronary artery disease, assessing stenosis, thrombosis, and aneurysms. It can also guide angioplasty or stent placement. The procedure involves inserting a catheter through the wrist or groin to the coronary arteries, injecting contrast, and taking X-ray images. Pre-procedure nursing care includes obtaining consent, fasting, securing IV access (20G+ in the left arm, right arm for access if possible), administering antiplatelet medications (clopidogrel, aspirin), stopping metformin, confirming heparin regimen, and ensuring family presence. Post-procedure care focuses on managing bleeding and pain, particularly at the access site (radial or femoral), monitoring circulation, and providing patient education on activity restrictions, hydration, and discharge instructions.
PCI, often performed with CAG, involves balloon angioplasty to widen narrowed coronary arteries or stent placement to maintain patency.
TFCA uses contrast to visualize cerebral blood vessels, diagnosing aneurysms, AVMs, and occlusive diseases. Pre-test care includes checking for contrast allergies, fasting, metal removal, IV access, fluid hydration, and skin preparation. Post-test care involves applying a sandbag to the femoral artery insertion site, monitoring vital signs, checking for bleeding and pain, educating patients to report swelling or abnormal sensations, and warning about clot or embolism risks.
Ultrasound uses high-frequency sound waves to create real-time images of internal organs without radiation exposure, making it non-invasive and safe. It evaluates structure and function of organs like the heart, liver, pancreas, kidneys, and thyroid. Widely used in obstetrics to monitor fetal growth and development, it also aids in breast cancer diagnosis, assesses vascular blood flow and blockages (Doppler ultrasound), and evaluates joint and muscle injuries.
Neck, breast, and thyroid ultrasounds usually require no special preparation, but nurses should ensure patient privacy and explain that gel will be used. Liver or gallbladder ultrasounds require fasting. Kidney, bladder, and pelvic ultrasounds need a full bladder. Transrectal ultrasound (for prostate or bladder issues) requires a laxative and a full bladder. Doppler ultrasound assesses blood flow. Key nursing points: patient positioning, minimizing movement, fasting for digestive exams, and being aware of potential gel allergies.
Nuclear medicine scans use radioactive pharmaceuticals injected into the body to assess organ function and metabolism, creating images that reveal physiological processes rather than just structure. This differs from CT or MRI, which primarily show organ shape and size. Since radioactive substances are used, they remain in the body for a period, requiring special precautions.
Types include PET (Positron Emission Tomography) for cancer staging, dementia, and cardiac diseases, and SPECT (Single Photon Emission Computed Tomography) for myocardial perfusion and brain blood flow. Organ-specific scans include Bone Scan (for fractures), Thyroid Scan (for function/nodules), Renal Scan (for kidney function), and Lung Scan (for pulmonary embolism). Nursing care involves confirming pregnancy/lactation, specific fasting protocols (e.g., 6+ hours for PET; avoiding caffeine 24 hours prior for cardiac), explaining the longer duration, ensuring blood glucose control for PET-CT (as high blood sugar can interfere), and emphasizing immobility after radioactive injection. Post-scan, encourage fluid intake for excretion and advise avoiding close contact with pregnant women or infants, and proper toilet hygiene for 24 hours.
Regardless of the imaging test, nurses must always prioritize accurate patient identification, confirm appointments, provide thorough patient education, verify consent requirements, check fasting status, assess for contrast allergies, confirm pregnancy, ensure necessary bowel or skin preparation, review blood test results (e.g., creatinine), plan optimal patient flow for multiple tests, and provide comprehensive pre- and post-procedure care.