Lung scintigraphy - indications, contraindications

Contents:

1. When appointed?

2. How to prepare?

3. Contraindications

lung scintigraphy is informative, reliable and painless diagnostic method by which medical professionals checking the blood supply of the respiratory system.

Usually, the study is assigned for diagnosing thrombi preventing normal blood flow and to locate on the circulating bloodstream embolus.It can help you to obtain reliable data for the diagnosis of bronchial lung cancer, not noticeable on X-rays.This survey technique has also other indications.

During the procedure used two methods to estimate:

  • Ventilation, allows you to visualize the air flow in the lung lobe.For this patient inhales an aerosol or an air-gas mixture with a radioactive marker.
  • Perfusion allows to visualize the distribution of blood in the lungs and the blood stream directly from the right ventricle into the pulmonary artery.

ventilation scintigraphy is as follows:

  1. before scanning the patient inhales a radioactive isotope in an aerosol
    or a gas-air mixture until the gas balance.
  2. Gamma Camera detects radiation markers in the lungs.

cold areas of the image indicate that the air does not flow into these sectors.Lock airway, usually due to stenosis occurs, the fluid, the presence of a tumor or some other pulmonary pathology.

If the air in the lungs has spread uniformly, but was found to poor circulation, it may be a sign of embolism.

perfusion scintigraphy has the following sequence:

  1. before scanning a patient intravenously Technetium-99m (radioactive marker), which is attached to Macro Aggregated Albumin (carrier molecule).
  2. After the collapse of technetium begins its radiation, which is registered by the gamma camera.

If one of the radioactivity is no easy areas, it says about the damage of the thrombus area, blocking the pulmonary artery, or it may indicate lung disease.

The entire procedure takes about 15-20 minutes, since the scanning will start immediately after the introduction of the radioisotope.But during the first two days after the lung scintigraphy can not breastfeed, as the radioactive substance passes into breast milk.

As for complications, they are rare.Radioisotopes emit the minimum amount of radiation, so the risk to the patient and his entourage there.There is a minimum probability of cell damage by gamma rays.However, in this case we are talking about emission volumes are much lower than in situations with CT or X-rays.Also, there is a small risk of allergy to a radioactive marker.

When he appointed?

indications for lung scintigraphy are:

  • Interstitial lung disease.
  • diagnosis of pulmonary embolism (pulmonary embolism).
  • Dynamic control of the treatment of pulmonary embolism.
  • Determining the causes of pulmonary hypertension.
  • Preparation for surgical interventions (installation of a functional lung status).
  • Diagnostics bronchopleural fistula.
  • Evaluation of congenital diseases of the lungs and heart defects (arteriovenous fistulas, stenosis (narrowing) of the pulmonary arteries, cardiac shunts).
  • suspected heart failure.
  • Identification of chronic obstructive pulmonary disease.

How to prepare?

lung scintigraphy does not require special preparation of the patient.

Contraindications Contraindications to the procedure are considered:

  • Hypersensitivity of radioactive substances used in scintigraphy.
  • Pregnancy and lactation (breastfeeding).

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