Postoperative Pulmonary Complications (PPCs)
1. 📌 Definition &
Incidence
PPC = pulmonary abnormality หลังผ่าตัดที่มี
clinical significance และกระทบ outcome
Common PPCs
- Atelectasis
- Pneumonia
/ bronchitis
- Respiratory
failure (MV >48 hr / reintubation)
- Hypoxemia
- COPD/asthma
exacerbation
📊 Incidence:
- ~6–7%
โดยรวม (สูงได้ถึง 70% ขึ้นกับนิยาม/กลุ่มผู้ป่วย)
2. ⚠️ Clinical Impact
- ↑ Mortality (≈10%
30-day mortality)
- ↑ ICU admission
- ↑ Length of stay (14 vs 6
days)
👉 รองจาก cardiac
complications ในแง่ mortality
3. 🧠 Pathophysiology (Key
Concept)
หลังผ่าตัด:
- ↓ Lung volume (restrictive
pattern)
- VC ↓ 50–60%
- FRC ↓ ~30%
Mechanism
- diaphragmatic
dysfunction (หลัก)
- pain → splinting
- ↓ tidal volume + ↑ RR
- ↓ cough + mucociliary
clearance
- residual
anesthetic/opioid → ↓respiratory drive
👉 → atelectasis + V/Q mismatch → hypoxemia
4. 👤 Patient-related Risk
Factors
Strong predictors
- Age
>50 (risk ↑ตามอายุ)
- COPD
(OR ~2.3)
- Heart
failure (stronger than COPD)
Other important factors
- Smoking
(RR ~1.7)
- OSA
- Pulmonary
HT → high mortality
risk
- Interstitial
lung disease (IPF)
- Recent
respiratory infection (<1 month) →
OR ~5.5
- Low
albumin (<3 g/dL)
- Functional
dependence / ASA >2
Notable points
- Obesity
≠ independent risk (surprisingly)
- Asthma
(well-controlled) →
riskไม่เพิ่ม
- Smoking
cessation ≥4–8 wk →
ลด risk
5. 🏥 Procedure-related Risk
Factors (สำคัญมาก)
Highest impact factor = Surgical site
Risk ↓ ตามระยะห่างจาก diaphragm
|
Surgery |
Risk |
|
Thoracic / Upper abdominal |
🔴 สูงมาก |
|
Lower abdominal |
🟡 ปานกลาง |
|
Extremity |
🟢 ต่ำ |
Other procedural risks
- Duration
>3–4 hr → risk ↑มาก
- Emergency
surgery
- General
anesthesia > neuraxial
- Residual
neuromuscular blockade
6. 🧪 Preoperative Evaluation
Core principle
👉 History + Physical =
สำคัญที่สุด
Screen for:
- dyspnea,
exercise intolerance
- OSA
(STOP-Bang)
- COPD/asthma
control
Pulmonary Function Test (PFT)
❌ ไม่ routine
✔️
ทำเมื่อ:
- unexplained
dyspnea
- unclear
COPD/asthma control
- lung
resection surgery
👉 PFT ไม่เพิ่ม
predictive value มากกว่า clinical assessment
ABG
- ไม่ routine
- consider
ถ้า:
- SpO₂
<93%
- suspected
hypercapnia
CXR
❌ ไม่ routine
✔️
ทำเมื่อ:
- suspected
cardiopulmonary disease
7. 📊 Risk Prediction Tools
1. ARISCAT
(ใช้ง่ายสุด)
7 factors:
- Age
- SpO₂
ต่ำ
- Recent
infection
- Anemia
- Surgical
site
- Duration
>2 hr
- Emergency
Risk:
- Low:
1.6%
- Intermediate:
13%
- High:
42%
- Respiratory
failure
- Pneumonia
3. NSQIP calculator
- multi-complication
risk
8. 🔑 High-yield Clinical
Pearls
- PPC เป็น major cause of perioperative morbidity/mortality
- Surgical
site > patient factors (most important)
- Atelectasis
= central mechanism
- Age
+ HF + COPD = key triad risk
- PFT ไม่จำเป็นใน routine
- Recent
respiratory infection →
เลื่อนผ่าตัดถ้าเป็นไปได้
- Duration
surgery >4 hr →
risk ↑มาก
|
🧭 Clinical Approach (Practical) Step 1: Identify high risk
Step 2: Optimize
Step 3: Plan perioperative care
|
Prevention of Postoperative Pulmonary Complications
(PPCs)
1. 📌 PPCs ที่ต้องป้องกัน
- Atelectasis
- Pneumonia
- ARDS
- Aspiration
- Respiratory
failure / reintubation
- Bronchospasm
/ COPD exacerbation
2. ⚠️ High-risk patients (ต้อง focus)
- Upper
abdominal / thoracic / head-neck surgery
- Emergency
surgery
- Age
>65
- ASA
>2
- HF /
COPD
- Albumin
<3
- Smoking
(≤8
wk)
- Surgery
>3 hr
- OSA /
frailty
🧭 Strategy = Pre-op +
Intra-op + Post-op
3. 🧪 Preoperative Strategies
🚭 Smoking cessation
- ≥4–8
wk → best
- ≥2
wk → ยังได้
benefit
👉 ลด PPC ได้ ~27–37%
🫁 Optimize lung disease
- COPD
→ bronchodilator +
steroid
- Asthma
→ control ให้ดี (PEF >80%)
- Exacerbation
→ delay surgery
🦠 Infection
- Lower
RTI → เลื่อนผ่าตัด 2–4 wk
- Influenza/COVID
→ delay ตาม
severity
🪥 Oral care
- chlorhexidine
mouthwash → ↓ pneumonia
👉 simple + effective
🏃 Pulmonary
prehabilitation
- exercise
+ breathing training
👉 ↓ PPC ~50% (meta-analysis)
🧠 Patient education
- incentive
spirometry
- deep
breathing
👉 ต้องสอนก่อนผ่าตัด
4. 🏥 Intraoperative
Strategies
🧠 Anesthetic technique
- Prefer
regional/neuraxial > GA (ถ้า feasible)
👉 ↓ respiratory complications
💉 Neuromuscular blockade
- ใช้ short/intermediate-acting
- ต้อง reverse ให้ complete
👉 residual block = PPC ↑
⏱️ Duration & surgery type
- 3–4
hr → risk ↑มาก
- Upper
abdomen/thoracic →
highest risk
🌬️ Lung protective
ventilation
- TV
6–8 mL/kg
- PEEP
moderate
👉 ↓ PPC vs high TV
5. 🛏️ Postoperative
Strategies (สำคัญมาก)
🌬️ Lung expansion
- Deep
breathing
- Incentive
spirometry
- CPAP
(selected cases)
👉 ลด atelectasis
+ pneumonia
👉
deep breathing ≈ incentive spirometry
🫁 Noninvasive ventilation
- HFNC
/ CPAP / NIV
👉 ↓ reintubation ใน respiratory failure
🚶 Early mobilization
- เริ่ม POD1
👉 delay 1 วัน → PPC ↑ ~3 เท่า
💊 Pain control
- multimodal
analgesia
- neuraxial
> opioid alone
👉 ช่วยหายใจลึก + mobilize
⚠️ opioid มาก → respiratory
depression
🚫 Avoid routine NG tube
- ↑ pneumonia (RR ~1.7)
👉 ใช้เฉพาะเมื่อจำเป็น
🛌 Positioning
- head
elevation / semi-recumbent
👉 ↓ aspiration + hypoxemia
🩸 Goal-directed therapy
- อาจ ↓ pneumonia / ARDS (บาง study)
6. 🔑 High-yield Bundle (ใช้จริง)
👉 “ICOUGH bundle”
- Incentive
spirometry
- Cough
& deep breathing
- Oral
care
- Understanding
(education)
- Get
out of bed (mobilization)
- Head
elevation
👉 ↓ pneumonia + reintubation
🧠 Clinical Takeaways
- PPC
= major preventable morbidity
- Surgical
site + duration = strongest risk
- Pre-op
optimization สำคัญที่สุด
- Post-op
care (mobilization + lung expansion) = key
- Avoid:
- residual
paralysis
- routine
NG tube
- prolonged
immobilization
📌 Practical Approach
Pre-op
- stop
smoking
- optimize
lung
- treat
infection
- teach
breathing exercises
Intra-op
- lung
protective ventilation
- minimize
duration
- full
NMBA reversal
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