check pulses, check temperature
From the book:
i. Pulses, especially below the catheterization site, for equality and symmetry. (Pulse distal to the site may be weaker for the first few hours after catheterization but should generally increase in strength)
ii. Temperature and color of the affected extremity because coolness or blanching may indicate arterial obstruction
iii. Vital signs, which are taken frequently as every 15 minutes with special emphasis on heart rate, which is counted for 1 full minute for evidence of dysrhythmias or bradycardia
iv. Blood pressure especially for hypotension which may indicate hemorrhage from cardiac perforation or bleeding at the site of initial catheterization
v. Dressing, for evidence of bleeding of hematoma, formation in the femoral or antecubital area
vi. Fluid intake, both IV and oral to ensure adequate hydration (blood loss in the catheterization laboratory, the child’s NPO status, and diuretic actions of dyes used during the procedure put children at risk for hypovolemia and dehydration
vii. Blood glucose levels for. Hypoglycemia, especially in infants who should receive IV fluids containing dextrose