Respiratory Flashcards
What does a bovine cough suggest?
Vocal cord palsy
At what SaO2 does central cyanosis start to become visible?
SaO2 <90%
Does COPD result in clubbing?
No
What are the cardiovascular causes of clubbing?
Cyanotic/congential heart disease and infective endocarditis
What are the respiratory causes of clubbing?
MOST COMMON: Lung cancer (but not usually small cell as it develops too quickly). Chronic pulmonary suppuration: bronchiactasis, lung abscess, empyema. Also idiopathic pulmonary fibrosis (and a lesser extent, other interstitial lung disease).
LESS COMMON: asbestosis, cystic fibrosis, pleural mesothelioma or pleural fibroma.
What are the GI causes of clubbing?
cirrhosis, IBD, coeliac disease
What is the name of the process that leads to clubbing that also can cause detectble arthropathy at the wrist?
Hypertrophic pulmonary oestoarthropathy. Presents as periosteal inflammation at the distal ends of long bones and can be detected by palpating the distal ends of the radial and ulnar bones, but also the ankles and metacarpal/metatarsal bones.
Other than asterixis, what might be found in the hypercapnoeaic patient?
Confusion, warm peripheries and bounding pulse.
What is the triad of signs that comprises a Horner’s syndrome?
Ptosis, miosis (pupil constriction) and anhidrosis of the affected side.
What is the cause of a Horner’s syndrome?
Hypothalamus lesion
Lateral medullary syndrome
C-spine disease
Lung malignancy
Lower brachial plexopathy
Carotid aneurysm
Thyroid lesions
Neck lymphadenopathy
What muscle closes the upper and lower lids and what innervates this muscle?
Orbicularis oculi. Innervated by the seventh (facial) nerve.
What muscle opens the upper eye lid and what innervates this muscle?
The levator palpedbrae superioris. Innervated by the third (occulomotor) cranial nerve.
What is Mullers muscle?
It’s the little muscle that opens the eye really wide when someone looks shocked. It’s innervated by the sympathetic nervous system, and becomes paralysed when the sympathetic chain is paralysed.
Horner’s syndrome is caused by what?
Unilateral defect of the sympathetic innervation of the head and neck. This can occur as a result of a lesion anywhere along this tract from the hypothalmus, into the brainstem, down the spine to the T1 level, then up through the sympathetic chain, via the neck along the carotid and jugular veins or in the face.
What is the differential cranial nerve deficit for a unilateral ptosis if not Horner’s syndrome?
CNIII nerve palsy, however this would also cause issues with extraocular muscles leading to a down and out appearance.
What pathologies lead to tracheal deviation towards the lesion?
Upper lobe collapse, upper lobe fibrosis, pneumonectomy
What pathologies lead to tracheal displacement away from the side of a lung lesion?
Massive pleural effusion or tension pneumothorax
What are the types of added breath sounds?
Wheezes (continuous),crackles (interrupted), and rubs.
What is the significance of polyphonic vs monophonic wheeze?
Polyphonic wheezes are the result of multiple foci of airway narrowing in say COPD or asthma. A monophonic wheeze suggests a single narrowing of an airway producing a single note - e.g. with a intrabronchial malignancy.
What is the significance of early, vs mid-late vs pan inspiratory crackles?
Early only crackles are heard in small airways, rather than alveolar, disease such as COPD and cease by mid inspiration. Mid-late or pansystolic crackles suggest disease isolated to the alveoli. These mid-late or pansystolic crackles can then be further characterised as fine, medium or coarse. Numerous fine crackles are classic of interstitial lung disease. Medium crackles are usually due to pulmonary oedema. Coarse crackles suggest signifcant intra-airway secretions impacting on normal alveolar function seen in diseases such as bronchiectasis or pneumonia.
What are the differentials for a pleural friction rub?
Pneumonia, pulmonary infarction. Rarely, malignancy, spontaneous pneumothorax.
What does increased vocal resonance indicate?
Increased tissue density that is able to transmit higher pitch sounds. This usually indicates consolidation secondary to infection or other cause.
What components of the cardiac exam should be included routinely as part of respiratory exam?
JVP, palpate for right heart dysfunction (heaves and thrills), auscultate for P2, look at the legs for pulmonary oedema or evidence of DVT, examine the liver the displacement inferiorly due to COPD and tendorness or pulsatility due to right heart failure with TR.
Which way does the trachea go in unilateral atelechtasis?
Deviation towards the atelectasis