tear duct imaging

Diagnostic value of lacrimal imaging for lacrimal passage obstruction in patients with tears. The patient took the seat, blinked, and leaned back in front of the slit lamp modified head holder. Facing the probe equipped with the pinhole type collimator, the adjustment probe was 12 cm away from the patient's eye. Pipette 99mTcO4-3.7MBq, volume 0.05mL, and drip into the conjunctival sac in the middle of each eye. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: The patient takes a sitting position or a lying position. Normal value The radioactive drug TCO or INCL was used as the imaging agent. After the radionuclide was dropped into the conjunctival sac under normal conditions, the lacrimal sac was displayed within 1 min, and the morphology was approximately oblong, and the apex was blind and the nasolacrimal duct was connected. The nasolacrimal duct showed a clear image in 1 to 2 minutes, showing a curved strip shape; the time for the radionuclide to reach the nasal cavity was about 2 to 3 minutes, and no more than 5 minutes at the latest. Clinical significance Abnormal results: (1) lacrimal duct obstruction caused by trauma; (2) purulent secretion in chronic dacryocystitis washing; (3) other acute inflammation of the eye; (4) bleeding tendency or nasal deformity; ) acute dacryocystitis. The person in need of examination checks whether the lacrimal duct is unobstructed, determines the obstruction site and expands the narrow lacrimal duct. Precautions Taboo before inspection: Pay attention to the movements to be light and avoid rough operation. Requirements for examination: The patient takes a sitting position or a lying position. Inspection process The patient took the seat, blinked, and leaned back in front of the slit lamp modified head holder. Facing the probe equipped with the pinhole type collimator, the adjustment probe was 12 cm away from the patient's eye. Pipette 99mTcO4-3.7MBq, volume 0.05mL, and drip into the conjunctival sac in the middle of each eye. Instant dynamic acquisition. Not suitable for the crowd Inappropriate crowd: There is no scope for this, and it is unnecessary to check if the eyes are fine.