USMLE Step 1 Respiratory Physiology Review 61 21 Obstructive Lung Diseases

USMLE Step 1 Respiratory Physiology Review 61 21 Obstructive Lung Diseases

On these “Gold Standard Step 1 Facts” pages you will find Free:

  • USMLE Audio Review files from our “Gold Standard USMLE Reviews”
  • Transcriptions of those files
  • And videos (as they become available)

The idea is that you can review for the USMLE online by:

  • Listening to the Audio
  • Following along with the transcription
  • Or by watching the video (if available)

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Let’s start our USMLE Review with Anatomy from the Gold Standard USMLE Step 1 Audio Review program.

Play USMLE Audio MP3 61 21 Obstructive Lung Diseases Below

Begin 61 21 Obstructive Lung Diseases Transcription

What is the key concept for obstructive lung diseases?

  •  The key concept for obstructive lung diseases is air flow obstruction that leads to increased residual volume.

What happens to the forced expiratory volume 1 over the forced vital capacity ratio in the presence of obstructive lung diseases?

  • It is decreased below 80%

There are four causes. In each case, I will read the description. Please respond with the disease

First description:

Alveolar wall breakdown creating enlarged air spaces and weak recoil. Often a result of cigarette smoking. 1-antitrypsin may also be a cause. What is the disease?

  • Emphysema

Second, what is this a description of?

Inflammation of the mucus tissue in the bronchial passage with cough that releases sputum for a minimum of three months in the past two years and hypertrophy of mucus secreting glands in the bronchials

  • Chronic bronchitis

Third, what disease is this a description of?

Necrotizing bronchial infection with irreversible widening and thickening of bronchial walls, blood or puss in the sputum, cystic fibrosis, bronchial obstruction, and ciliary impairment

  • Bronchiectasis

For the last description, constriction of airways due to hypersensitivity, allergies, and stress. What is the disease?

  • Asthma

Student doctor, please pause the tape and summarize what has been discussed about obstructive lung diseases.

  • The key concept for obstructive lung diseases is air flow obstruction that leads to increased residual volume. In the presence of obstructive lung disease, the forced expiratory volume 1 forced vital capacity ratio is decreased below 80%. There are four causes. The description of emphysema is alveolar wall breakdown creates enlarged airspaces and weak recoil often a result of cigarette smoking. 1-antitrypsin may also be a cause. A description of chronic bronchitis is inflammation of the mucus tissue in the bronchial passages with cough that releases sputum for a minimum of three months in the past two years and hypertrophy of mucous secreting glands in the bronchials. In the presence of Bronchiectasis , there is a necrotizing bronchial infection with irreversible widening and thickening of bronchial walls, blood and puss in the sputum, cystic fibrosis, bronchial obstruction, and ciliary impairment. And finally, with asthma, there is constriction of airways due to hypersensitivity, allergies, and stress.

****END OF TRANSCRIPTION****

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