Lung sounds

1
Lung sounds

• PPA

2
Four Classes of Sounds

• Normal
• Mild Acute
• Severe Acute
• Chronic

3
Normal

• What is our definition of a normal
• Little to no pathophysiological signs
• No permanent lung tissue damage
• Antibiotic therapy may not be justified

4
Normal - Spectrogram
Click on speaker to hear actual Lung Sounds
The spectrogram of the sound shows little change
during respiratory phases (brown line).
5
Early Mild

• What is our definition of early mild
• Early pathophysiological symptoms
• Weight gaining ability starting to be compromised
• Antibiotic therapy is necessary with expectations
  of excellent response from cost effective
  medications

6
Spectrogram - Mild Bovine Lung Infection
Click on speaker to hear actual Lung Sounds
The spectrogram for the mild shows good air
movement for each respiratory phase (black line).
Each peak represents a respiratory phase where
airway obstructions cause noise to be made (brown
line).
7
Severe Acute

• What is our definition of severe acute
• Pathophysiological signs definitely visible
• Lung tissue quickly deteriorating
• Weight gaining ability severely hampered (not
  permanent)
• Aggressive antibiotic therapy necessary to
  minimize permanent damage

8
Severe Acute - Spectrogram
Click on speaker to hear actual Lung Sounds
Spectrogram shows signs of reduced air movement
(brown line) as well as the first signs of
consolidation (orange boxes).
9
Chronic

• What is our definition of chronic?
• Advanced pathophysiology
• Permanent lung tissue damage is present
• Treatment will only affect new infections
• Weight gaining ability permanently diminished

10
Chronic - Lungs
Click on speaker to hear actual Lung Sounds
Spectrogram reflects permanent consolidation of
lung tissue with near constant elevated level of
noise throughout respiratory phases (brown line).
11
Outward comparison

• Normal

• Mild Acute

12
Outward comparison

• Severe Acute

• Chronic

13
Histopathology comparison

• Normal

• Mild Acute

14
Histopathology comparison

• Severe Acute