Thoracic Flashcards
What is the most important predictor of difficult intubation?
CXR: Gives body habitus, airway anomalies
How much anatomic dead space is in in the conducting airways
150cc
name the blood supply of of the trachea and lung
Upper 2/3 trachea = inferior thyroid arteries
Lower 1/3 trachea = bronchial arteries
lung parenchyma = bronchial arteries
Name structures found at the mediastinum
Azygous vein, thoracic duct, phrenic nerve, vagus nerve
Where does azygous vein empty?
SVC
Where does the thoracic duct crosses midline (runs along the right side)
T4-T5
Where does the thoracic duct empty?
Left Subclavian Vein
Define the accessory muscles
SCM, levators, serratus posterior, scalenes
Primary function of Type I pneumocytes
Gas Exchange (diffuse in alveoli)
Primary function of Type II pneumocytes
Surfactant production
What is surfactant?
Phosphotidylcholine. 80% phospholipid. Decreases alveolar surface tension, keeps alveoli open
What are pores of Kahn?
Direct air exchange between alveoli
What is the single best predictor of being able to wean off ventilator after pulmonary resection?
FEV1
What other pre-op values needed before pulm resection?
- DLCO >11-12ml/min/mmHg CO
- pCO2 60
- VO2 max >10 ml/kg/min
What is DLCO?
Carbon Monoxide Diffusion Capacity: Measures lung ability to transfer gases
what is the MCC of hypoxemia post pulm resection?
Atelectasis causing V/Q mismatch
what is the MCC of hypercarbia post pulm resection?
alveolar hypoventilation (poor minute ventilation)
what is MC nerve injury post pulm resection?
Brachial plexus injury on the dependent arm
What is the complication of segmentectomy/wedge
Persistent air leak
What is the MC Cx of lobectomy
Atelectasis
What complications can arise from pneumonectomy?
Arrhythmia, tracheoesophageal or bronchopleural resection, death, cardiac herniation, long bronchial stump syndrome, post-pneumonectomy syndrome
What is post-pneumonectomy syndrome?
mediastinal shift after right pneumonectomy. Complicated by main bronchial compression
What is sx of post-pneumonectomy syndrome?
Stridor
What is the first thing you do to manage a persistent air leak?
Check if CT is on suction. Check system. Repeat CXR
Besides checking chest tube, what else can you do for a persistent air leak?
- Place 2nd chest tube anteriorly
- Bronchoscopy
- Wait it out (7days for simple air leaks)
What is you last possible treatment for persistent air leak due to spontaneous PTX?
- Staple bleb
2. mechanical pleurodesis
What is you last possible treatment for persistent air leak due to post pulm resection?
mechanical pleurodesis
What is the MCC of atelectasis after lung resection
- Hypoxemia
2. Pulm shunting
What is the MCC of Adult Tracheo-esophageal fistula?
- Esophageal Ca
2. Post-op (pneumonectomy)
What is the primary cause of post-pneumonectomy pulm edema?
- inflammatory reaction
- vasc permeability
- Increase perfusion to remaining lung
MCC of empyema
- PNA
2. Post-thoracic Surgery
What are the 3 stages of empyema
- exudative (Tx: Ct and Abx)
- fibropurulent (Tx: CT and Abx)
- organizing (Tx: Decortication)
What alternative tx for organizing empyema besides decortication?
Eloesser flap: open thoracic window, direct opening to environment
What are sx of early post-op broncho-pleural flap?
massive air leak. resp compromise
What is the treatment for early post-op broncho-pleural flap?
tx: place intercostal muscle flap over bronchus
What is MCC of late post-op broncho-pleural fistula?
pressure from empyema
What is the treatment for late post-op broncho-pleural flap?
- Place CT
- place pt w/affected side down
- bronchoscopy
- abx
- re-expand lungs, decortication, claggett, high frequency ventilation
What is a claggett procedure
fills post-pneumonectomy space with permanent abx solution + intercostal muscle flap
MC benign adult lung tumor
Hamartoma
What percent of solitary pulmonary nodules are hamartomas?
10%
How does a hamartoma appear on CT?
popcorn lesion
Tx for Hamartoma
Do not require resection. Repeat CT in 3 months to confirm diagnosis
MC benign upper airway tumor in kids?
hemangioma
MC malignant upper airway tumor in kids?
carcinoid
MC benign upper airway tumor?
papilloma
MC malignant upper airway tumor?
SCCA
MC bronchial gland tumors
Carcinoids (90%)
1. Typical (90%) 2. Atypical (10%)
MC late Cx after tracheal surgery
granulation tissue formation
MC early Cx after tracheal surgery
laryngeal edema
What tx options for post-intubation stenosis?
- serial dilation
- tracheal resection
- If emergent, tracheostomy
MCC for tracheo-innominate artery fistula
Post-tracheostomy
How to treat tracheo-innominate artery fistula?
Surgical ligation + partial innominate artery resection. NO GRAFT. repair with strap muscle