# Clinical Cases: Pre-Operative Evaluation and Optimization

## Case 1: Cardiac Risk Stratification for Non-Cardiac Surgery

### Patient Presentation
**Demographics:** 68-year-old male

**Chief Complaint:** Right inguinal hernia causing intermittent discomfort

**History of Present Illness:**
Mr. Thompson is referred for elective right inguinal hernia repair. The hernia is reducible and has been present for 6 months. He reports mild discomfort with heavy lifting but no obstructive symptoms. He works part-time as a consultant and walks 2 miles daily without difficulty.

**Past Medical History:**
- Hypertension (well-controlled)
- Type 2 diabetes mellitus on metformin (HbA1c 7.2%)
- Hyperlipidemia
- Remote history of NSTEMI 4 years ago, treated with PCI to LAD with drug-eluting stent
- Current medications: aspirin 81mg, atorvastatin 40mg, lisinopril 20mg, metformin 1000mg BID

**Social History:**
- Former smoker, quit 5 years ago (30 pack-years)
- Occasional alcohol
- Lives with wife, independent ADLs

**Physical Examination:**
- Vitals: BP 132/78, HR 72, BMI 29
- Cardiovascular: Regular rhythm, no murmurs, JVP normal
- Lungs: Clear
- Abdomen: Soft, right inguinal bulge with cough impulse, easily reducible
- Extremities: 1+ peripheral pulses, no edema

**Laboratory Studies:**
- Creatinine: 1.1 mg/dL
- HbA1c: 7.2%
- ECG: Normal sinus rhythm, no ischemic changes

### Clinical Questions

1. **Calculate this patient's RCRI score and interpret the risk:**

   **RCRI Criteria Assessment:**
   - High-risk surgery (intraperitoneal, intrathoracic, suprainguinal vascular): NO (inguinal hernia is low-risk)
   - History of ischemic heart disease: YES (prior MI, PCI)
   - History of heart failure: NO
   - History of cerebrovascular disease: NO
   - Diabetes requiring insulin: NO (on oral agents only)
   - Renal insufficiency (Cr >2.0): NO

   **RCRI Score: 1 point**
   - Predicted MACE risk: 0.9%
   - Interpretation: Low cardiac risk for this elective procedure

2. **What is this patient's functional capacity in METs? Does he need further cardiac testing?**

   **Functional Capacity Assessment:**
   - Walks 2 miles daily without difficulty = >4 METs
   - Works part-time, active lifestyle
   - No symptoms of angina or dyspnea with exertion

   **Decision:** No additional cardiac testing needed
   - Functional capacity exceeds 4 METs
   - Asymptomatic on current regimen
   - Low-risk surgery
   - Stable coronary disease >4 years from intervention

3. **How should you manage his aspirin perioperatively given his cardiac stent?**

   **Aspirin Management:**
   - Continue aspirin 81mg throughout the perioperative period
   - DES placed 4 years ago - past the high-risk window for stent thrombosis
   - Bleeding risk of inguinal hernia repair is low
   - Risk of stent thrombosis if aspirin stopped > bleeding risk of continuing
   - Document discussion with patient and cardiology if any concerns

4. **What medication adjustments are needed on the day of surgery?**

   | Medication | Day of Surgery |
   |------------|----------------|
   | Aspirin | Continue |
   | Atorvastatin | Continue |
   | Lisinopril | Hold morning of surgery (prevents intraoperative hypotension) |
   | Metformin | Hold day of surgery (resume when eating and renal function stable) |

### Clinical Image

![Coronary artery disease illustration](https://upload.wikimedia.org/wikipedia/commons/0/0d/Blausen_0463_HeartAttack.png)

*Image: Illustration of coronary artery disease and myocardial infarction. Understanding cardiac history is essential for preoperative risk stratification. Source: Blausen Medical, Wikimedia Commons. License: CC BY 3.0.*

**Image Attribution:** Blausen.com staff (2014). "Medical gallery of Blausen Medical 2014". WikiJournal of Medicine. CC BY 3.0.

---

## Case 2: Managing Anticoagulation for Urgent Cholecystectomy

### Patient Presentation
**Demographics:** 72-year-old female

**Chief Complaint:** Right upper quadrant pain for 24 hours

**History of Present Illness:**
Mrs. Chen presents to the ED with RUQ pain, nausea, and low-grade fever. Ultrasound shows cholelithiasis with gallbladder wall thickening (6mm), pericholecystic fluid, and positive sonographic Murphy's sign consistent with acute cholecystitis. She is hemodynamically stable and admitted for IV antibiotics with plan for cholecystectomy within 24-48 hours.

**Past Medical History:**
- Atrial fibrillation (persistent) on warfarin
- Mechanical mitral valve replacement 8 years ago
- Hypertension
- CHA2DS2-VASc score: 5 (female, age, HTN, vascular disease)
- Current INR: 2.8

**Medications:**
- Warfarin 5mg daily
- Metoprolol 50mg BID
- Lisinopril 10mg daily

**Physical Examination:**
- Vitals: T 38.2C, HR 88 irregular, BP 145/82
- Abdomen: RUQ tenderness with guarding, positive Murphy's sign
- No peritoneal signs

### Clinical Questions

1. **What is this patient's thromboembolic risk, and does she require bridging anticoagulation?**

   **Thromboembolic Risk Assessment:**
   - Mechanical mitral valve = HIGH RISK (highest risk valve position)
   - Atrial fibrillation with CHA2DS2-VASc of 5 = HIGH RISK

   **Decision: BRIDGING IS REQUIRED**
   - Mechanical mitral valve carries the highest thromboembolic risk
   - Stopping anticoagulation without bridging is not acceptable
   - Annual stroke risk without anticoagulation: >10%

2. **Outline a bridging protocol for this patient:**

   **Preoperative Bridging Timeline:**
   | Day | Action |
   |-----|--------|
   | Day -5 | Stop warfarin |
   | Day -3 | Start enoxaparin 1mg/kg BID (therapeutic dose) when INR <2.0 |
   | Day -1 | Check INR (goal <1.5 for surgery) |
   | Day -1 evening | Hold evening dose of enoxaparin |
   | Day 0 (surgery) | Check INR, proceed if <1.5 |

   **Postoperative Bridging:**
   - Resume enoxaparin 12-24 hours postop if hemostasis secure (assess bleeding risk)
   - Restart warfarin POD 1 (takes 5 days to achieve therapeutic INR)
   - Continue bridging until INR therapeutic (2.5-3.5 for mechanical mitral valve)
   - Consider reduced-dose bridging (0.5mg/kg BID) if high surgical bleeding risk

3. **The patient's surgery is moved up due to worsening symptoms. INR is still 2.1 the morning of surgery. What are your options?**

   **Reversal Options:**
   - **Vitamin K 2.5-5mg PO/IV:** Takes 6-12 hours for effect; suitable if surgery can wait
   - **Fresh Frozen Plasma (FFP):** Immediate effect but requires volume administration; gives 4-6 hours of coverage
   - **4-Factor PCC (Prothrombin Complex Concentrate):** Rapid, complete reversal; preferred for urgent surgery

   **Recommendation:** Given mechanical valve, avoid full reversal if possible. If surgery can wait 6-12 hours, give low-dose Vitamin K (2.5mg IV). If must proceed immediately, give 4F-PCC and accept small residual INR elevation (target 1.5).

4. **What antibiotics should be given preoperatively?**

   **Antibiotic Selection:**
   - Already receiving treatment antibiotics for cholecystitis
   - Standard prophylaxis: Cefazolin 2g IV within 60 minutes of incision
   - Given ongoing infection: Continue current regimen (e.g., piperacillin-tazobactam) and ensure dose given within 60 minutes of incision
   - Redose cefazolin for cases >4 hours or blood loss >1.5L

### Clinical Image

![Gallbladder ultrasound showing gallstones](https://upload.wikimedia.org/wikipedia/commons/9/9f/Cholezystolithiasis-Sonographie.png)

*Image: Ultrasound image demonstrating cholelithiasis (gallstones) with characteristic acoustic shadowing. Source: Wikimedia Commons. License: CC BY-SA 3.0.*

**Image Attribution:** Ultrasound of cholelithiasis. Hellerhoff, Wikimedia Commons. CC BY-SA 3.0.

---

## Case 3: Optimizing the High-Risk Elderly Patient

### Patient Presentation
**Demographics:** 81-year-old female

**Chief Complaint:** Incarcerated umbilical hernia requiring repair

**History of Present Illness:**
Mrs. Patterson presents with a 6-hour history of an irreducible umbilical hernia. The overlying skin is erythematous and she reports nausea. CT shows incarcerated omentum without bowel involvement or signs of strangulation. She requires semi-urgent surgical repair within 6-12 hours.

**Past Medical History:**
- COPD on home oxygen 2L (FEV1 45% predicted 6 months ago)
- Heart failure with reduced ejection fraction (EF 35%)
- Type 2 diabetes
- Chronic kidney disease stage 3b (GFR 38)
- BMI 34
- Lives in assisted living, uses walker

**Medications:**
- Tiotropium, budesonide/formoterol inhalers
- Carvedilol 12.5mg BID
- Furosemide 40mg daily
- Lisinopril 5mg daily
- Glipizide 5mg BID
- Metformin 500mg BID

**Functional Status:**
- Cannot climb one flight of stairs without stopping
- Limited to short distances with walker
- Requires assistance with bathing
- Functional capacity estimated at 2-3 METs

### Clinical Questions

1. **What is this patient's RCRI score and overall operative risk?**

   **RCRI Score:**
   - High-risk surgery: NO (umbilical hernia)
   - Ischemic heart disease: NO (HFrEF without documented CAD)
   - Heart failure: YES (+1)
   - CVA/TIA: NO
   - Insulin-dependent diabetes: NO
   - Creatinine >2.0: NO (1.6 mg/dL)

   **RCRI Score: 1 point (0.9% MACE risk by RCRI)**

   **However, RCRI underestimates risk in this patient:**
   - Poor functional capacity (<4 METs)
   - Frailty indicators present
   - Multiple comorbidities not captured by RCRI
   - ACS NSQIP calculator would provide better estimate
   - True perioperative mortality risk likely 5-10%

2. **How would you optimize her for surgery in the available time window?**

   **6-12 Hour Optimization Protocol:**

   | System | Optimization |
   |--------|--------------|
   | Cardiac | Hold morning lisinopril; euvolemic fluid management; continue beta-blocker |
   | Pulmonary | Nebulizer treatments; incentive spirometry teaching; ensure inhalers given |
   | Renal | Judicious IV fluids; avoid nephrotoxins; check K+ |
   | Diabetes | Hold glipizide and metformin; check glucose; start insulin sliding scale |
   | Nutrition | NPO with IV dextrose if prolonged |

   **Not achievable in this timeframe:**
   - Smoking cessation benefit (needs 4-8 weeks)
   - Significant nutritional optimization
   - Pulmonary rehab

3. **The patient's daughter asks about the risks of surgery. How do you communicate this?**

   **Risk Communication Framework:**

   "Mrs. Patterson has several medical conditions that increase the risks of surgery. However, the incarcerated hernia needs to be repaired to prevent it from becoming strangulated, which would be much more dangerous.

   The main risks we're concerned about include:
   - Breathing problems after surgery requiring longer oxygen support
   - Heart strain or fluid buildup in her lungs
   - Kidney function getting worse temporarily
   - Wound healing problems given her diabetes
   - The possibility of needing ICU care after surgery

   We estimate her risk of a serious complication at approximately 20-30%, and her risk of not surviving the hospitalization at 5-10%. Without surgery, her risk is higher.

   We will do everything to optimize her condition before surgery and monitor her closely afterward."

4. **What code status and goals of care discussion should occur before surgery?**

   **Essential Elements:**
   - Confirm current code status and update as needed
   - Discuss possibility of postoperative ICU admission
   - Address intubation preferences if respiratory failure occurs
   - Clarify acceptable outcomes and duration of intervention
   - Document discussion clearly
   - Consider palliative care consultation if high-risk
   - Ensure healthcare proxy/POA identified

### Clinical Image

![Umbilical hernia diagram](https://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Inguinalhernia.gif/800px-Inguinalhernia.gif)

*Image: Anatomical diagram of abdominal wall hernia. Source: Wikimedia Commons. License: Public Domain.*

**Image Attribution:** Hernia anatomy illustration. National Library of Medicine, Public Domain.

---

## Summary Points

1. **RCRI components:** High-risk surgery, ischemic heart disease, CHF, CVA, insulin-dependent diabetes, Cr >2.0
2. **Functional capacity:** >4 METs reduces need for cardiac testing
3. **Aspirin for stents:** Continue perioperatively unless bleeding risk prohibitive
4. **Bridging anticoagulation:** Required for mechanical valves and high thromboembolic risk; stop warfarin 5 days before, bridge with LMWH
5. **Medication management:** Continue beta-blockers and statins; hold ACE-I/ARBs, metformin, and SGLT2 inhibitors
6. **Elderly optimization:** Focus on achievable goals within timeframe; honest risk communication; goals of care discussion essential
7. **Risk calculators:** ACS NSQIP provides procedure-specific estimates; RCRI may underestimate risk in frail elderly