2. Pre operative assessment
◦ Pre operative preparation
Intra operative management
◦ Induction & maintenance
◦ Monitoring
◦ Positioning
◦ lung isolation techniques
◦ one lung ventilation
Post op analgesia
Complications
3. Aim:
Identify patients who are at risk
to stratify peri operative management &
focus on high risk pts to improve their outcome
Preoperative assessment of vital capacity is critical because
at least three times the tidal volume (VT) is necessary for
an effective cough.
The overall operative mortality for the first 30 days after
pneumonectomy ranges from 5 to 13%, and correlates
inversely with the surgical case volume
4. Detailed History
Base line spirometry
Respiratory mechanics
Lung parenchymal function
Cardio pulmonary reserve assessment
5. Age
Patients functional status
Dyspnea and cough – Characteristics of sputum
Smoking – duration & frequency
exposure to asbestos or radiation
Chest pain
Recent infections
Immobility and venous insufficiency
metastatic disease-Mass effects and metabolic effects
of lung cancers.
Current medications
6. Appearance – wasting, body habitus
Cyanosis, clubbing
Tracheal position
Chest wall abnormalities
Respiratory rate, pattern & use of accessory muscles of
respiration
auscultation of lung fields
Cardiac examination – Third heart sound, loud P2, irregular
heart beat
Abdomen – liver size
CBC – Polycythemia / anaemia, Leucocytosis – Infection
ECG , X-ray
Gram stain / culture of sputum, cytology
Renal and liver function tests
7. Identify pts who are at risk for post op.
morbidity/mortality &
How much lung tissue can safely be removed without
making the patient respiratory cripple
8. Baseline Spirometry :
FEV1 & PpO FEV1
For example, after a right lower lobectomy a patient with a
preoperative FEV1 (or DLCO) 70% of normal would be
expected to have a postoperative
FEV1 = 70% × (1 - 29/100) = 50%
Vital capacity
FEV1 / VC
Residual volume / TLC
MVV
9. ABG
Diffusing capacity for CO (DLCO)
The DLCO correlates with the total functioning surface
area of alveolo capillary interface.
A ppo DLCO < 40% predicted correlates with both
increased respiratory and cardiac complications and is
relatively independent of the FEV1
10. Maximum oxygen consumption (VO2max)- Most useful
predictor of post-thoracotomy outcome.
Assessed by stair climbing test.
High risk- VO2max <15 mL/kg/min.
Low risk = Vo2max > 20 mL/kg/min
Moderate risk = Vo2max 15 to 20 mL/kg/min
6-minute test
(6MWT) <2000 ft (610 m) - Vo2max <15 mL/kg/min
Patients with a decrease of SpO2 greater than 4% during
exercise are at increased risk for morbidity and mortality.
11.
12. Identify pts who are at risk for post op.
morbidity/mortality &
How much lung tissue can safely be removed
without making the patient respiratory cripple
13. Patients who fail the spirometric criteria for operability
are considered for split function lung studies.
Exclusion of a lung or lobe with an endobronchial
tube/blocker to predict the function of the lung tissue that
would remain after lung resection
14. Ventilation and Perfusion Lung Scanning
with radioactive isotopes can be used to estimate the relative blood
flow to each lung.
If the predicted postoperative FEV1 is > 800ml a patient may be
considered for pneumonectomy
Unilateral Pulmonary Artery Occlusion
If the predicted FEV1 is < 800ml, a “functional pneumonectomy”
can be performed by testing the patient’s response to balloon
occlusion of the operative lung’s pulmonary artery. Patients are
excluded from pneumonectomy if the mean pulmonary artery
pressure exceeds 35mmHg or the PaO2 falls below 45mmHg.
15.
16. Assessment of suitability for lung resection
Cardiac risk should be stratified
All patients should have a preoperative ECG
All patients with a cardiac murmur should undergo
echocardiography
Patients should wait 6 weeks after myocardial
infarction before lung resection
Cardiology opinion should be sought for all patients
considered for lung surgery within 6 months of
myocardial infarction
17.
18. Summary of initial preoperative
assessment
All patients:
Assess exercise tolerance
estimate predicted
postoperative FEV1%
discuss postoperative
analgesia
discontinue smoking
Patients with predicted
postoperative FEV1<
40%:
DlCO
Ventilation perfusion Scan
VO2 max
Cancer patients:
consider the “4 Ms”:
mass effects
metabolic effects
Metastases
medications
COPD patients:
Arterial blood gas analysis
Physiotherapy
bronchodilators
Increased renal risk:
Measure creatinine and
blood urea nitrogen
19. Cessation of smoking
Dilate airways
Loosen secretions -Mucolytic and expectorant drugs
Airway hydration (humidifier/nebulizer)
Remove secretions - Postural drainage, Coughing, Chest
physiotherapy
Stabilize other medical problems
Medication Antibiotics—if purulent sputum
PPIs—if symptomatic reflux
Education, motivation and facilitation of postoperative care
Psychological preparation
Preoperative Incentive spirometry& Secretion removal
maneuvers
20.
21. ECG
Pulse Oxymetry
Capnography
Arterial blood pressure- repeated ABG s
CVP
Fibreoptic bronchoscopy –position of DLET
Urine output
Temperature
22.
23. Induction
Thiopentone- can cause Bronchospasm
propofol =satisfactory to prevent awareness, Etomidate= if
elderly and cardiac unstable
NMB
inhalational agents- halothane inhibits HPV.
Isoflurane better.
Advantages are: -blunting of airway reflexes
capability of high Fio2
ability to rapidly titrate anesthetic levels
minimal effect on HPV with values <1 MAC
Avoid N2O, use of air in oxygen mixture
TIVA- useful
Intra op analgesia – PCA, opioids, epidural analgesia or
blocks
24. ABSOLUTE
Isolation of each lung to prevent contamination of a healthy lung
◦ Massive hemorrhage
◦ Bronchopleural fistula
◦ Major bronchial disruption or trauma
Unilateral lung lavage
Video-assisted thoracoscopic surgery
RELATIVE
Surgical exposure—high priority
◦ Thoracic aortic aneurysm , Pneumonectomy , Lung volume reduction
◦ Minimally invasive cardiac surgery
Surgical exposure—low priority
◦ Esophageal surgery , Mediastinal mass resection, thymectomy
27. women – 35, 37Fr
men – 39,41Fr
depth required for insertion of the DLT correlates with
the height of the patient.
adult 170 -180 cm tall- depth is 29 cm.
For every 10 cm increase or decrease in height, the DLT is
advanced or withdrawn 1.0 cm.
Tracheal and bronchial dimensions can be also directly
measured from the chest radiograph or chest CT scan
28. Method Of Insertion
• Blind technique:
• DLT is passed with direct
laryngoscopy
• Turn 90 ° left (for left-sided DLT)
after the endobronchial cuff has
passed beyond the vocal cords.
• The DLT should pass the glottis
without any resistance.
• Bronchoscopic guidance
• Tip of the endobronchial lumen is
guided into the correct bronchus
after the DLT passes the vocal cords
using direct vision with a flexible
fiberoptic bronchoscope
30. Fibreoptic Bronchoscopy
Tracheal View
Confirm endobronchial portion in the left
bronchus
Bronchial cuff herniation over the carina
after inflation.
identify the takeoff of the right upper
lobe bronchus through the tracheal view.
Going inside this right upper lobe with
the bronchoscope should reveal three
orifices (apical, anterior, and posterior).
Endobronchial view
check for patency of the tube
Determination of margin of safety
The orifices of both the left upper and
lower lobes must be identified to avoid
distal impaction in the left lower lobe
and occlusion of the left-upper lobe
31.
32. has two compartments: a large, main lumen for
conventional air passage and a small lumen in the anterior
wall for passage of a BB .
33. ADVANTAGES DISADVANTAGES
DLET • Can suction lungs
independently
• Quality of suctioning better
• Can apply CPAP to non-
ventilated lung more easily
• Difficult to insert in
distorted airway
• Needs change in
postoperative ventilation
• Needs determination of
appropriate size
• Potential for tracheo-
bronchial injury
Bronchial
Blockers
• Can be used for selective lobar
blockade
• in tracheostomized patients
• in critically ill patients already
intubated with a single-lumen tube
• Can be used in children and small
adults
• lung inflates and
deflates very slowly
• difficult to apply CPAP
to non-dependent lung
Endobronchi
al intubation
• Useful in emergencies massive
bleeding
• Useful in children and very
small adults
• Inability to ventilate or
suction opposite lung If on
right side
• high risk of obstructing
right upper lobe bronchus
34. Lateral decubitus position
common problems are:
1. Ischemia, nerve damage, or compartment syndrome to
the dependent arm
2. Postoperative shoulder discomfort
3. Lateral angulation of the neck leading to jugular venous
obstruction
4. Hyperextension of the non-dependent arm leading to
traction or compression of the brachial and axillary
neurovascular bundles.
35. The intrapulmonary distribution of blood flow is regulated by
gravity,
lung Disease, and
regional PVR.
As a result, in the lateral decubitus position, the dependent lung
receives a greater proportion of the cardiac output.
the nondependent lung is well ventilated but poorly perfused
(high ventilation-to-perfusion [V/Q], and the dependent lung is
well perfused but poorly ventilated (low V/Q ratio).
These V/Q imbalances lead to altered pulmonary gas exchange.
36.
37.
38. Autoregulatory mechanism
Decreases the blood flow to the nonventilated lung by about
50%.
Primary stimulus is PAO2
◦ ↓ PAO2 stimulates precapillary vasoconstriction
redistributing pulmonary blood flow via a pathway
involving NO and/or cyclooxygenase synthesis inhibition
Rapid onset over the first 30 minutes and then a slower
increase to a maximal response at approximately 2 hours.
When the lung is partially hypoxic (30-70%) as in OLV, HPV
brings the PaO2 from dangerously low levels to acceptable
levels
39. FIO2 of 1.0
Ventilate with a TV of 6–8 mL/kg with PEEP 5 cm H2O
Respiratory rate to maintain PaCO2 between 35 and 40 mm Hg
Check the DLT/endobronchial blocker position subsequent to the
lateral decubitus positioning
If peak airway pressure exceeds 40 mm Hg during OLV,
DLT/endobronchial blocker malposition should be excluded
For hypoxemia, apply CPAP 10 cm H2O to the nondependent lung
If additional correction of hypoxemia is necessary add PEEP 5–10
cm H2O to the ventilated lung
Frequent recruiting maneuvers
Avoid fluid overload
TIVA may be preferable to inhalation anesthetics
If necessary, intermittently inflate and deflate the operated lung
40.
41.
42.
43. Bleeding
Respiratory Complications- Atelectasis ,
Pneumothorax, post resection hypoxemia, acute lung
injury, air leak
Neurologic complications- positioning
Chylothorax- injury to thoracic duct
Injury to surrounding structures- RLN &Phrenic N.
injury
infections
44. Respiratory failure – patients with low FEV1 or DLCO are at risk
incidence of postpneumonectomy pulmonary edema is 4%, but mortality is
30–50%
RISK FACTORS
Pneumonectomy (rt side) excessive fluids alcohol abuse.
high intraoperative ventilatory pressure index (combined airway pressure and
time),
presentation is biphasic.
Management
symptomatic
fluid restrictions, diuretic administration,
low ventilatory pressures and tidal volumes and measures to decrease the
pulmonary artery pressure.
primary onset in first 72 h -
Secondary after 72 h Asso. With aspiration or
bronchopleural fistula.
45. Recent study has shown that i.v. fluids in patients (more
than 3 l in the first 24 h) is an independent risk related to
acute lung injury.
Total positive fluid balance in the first 24 h periop should
not exceed 20 ml/kg.
Crystalloid administration should be limited to less than 3 l
in the first 24 h.
No fluid administration for third space fluid losses during
pulmonary resection.
Urine output more than 0.5 ml/kg/h is unnecessary.
If increased tissue perfusion is needed,its preferable to use
invasive monitoring and inotropes.
46. infrequent,
occurs immediately or within 24 h after surgery
DUE TO pressure differences between the two hemithoraces
mortality >50%
When cardiac herniation occurs after a right pneumonectomy, the
clinical presentation is due to impairment of the venous return
to the heart with an increase in central venous pressure,
tachycardia, profound hypotension, and shock.
An acute SVC syndrome ensues due to the torsion of the heart.
In contrast after a left-sided pneumonectomy, there is less
cardiac rotation, but the edge of the pericardium compresses the
myocardium.
leads to myocardial ischemia, arrhythmias and ventricular
outflow tract obstruction.
MANAGEMENT - EMERGENT Re-exploration
47. Incidence - 30% to 50%
◦ 60% to 70% are atrial fibrillation
Factors:
◦ Extent of lung resection
◦ Intrapericardial dissection
◦ Intraoperative blood loss
◦ Age of the patient
◦ Cardiac disease
49. Better preservation of the functional residual volume
Efficient mucociliary clearance
Alleviation of the inhibiting reflexes acting on the
diaphragm
prevention of atelectasis and secondary infections