A Complex ICU Patient

Patient Case: ICU 

Patient: 80-year-old male

History: Hypertension, Type 2 Diabetes Mellitus, chronic kidney disease stage 3, ischemic heart disease (PCI 3 years ago), obesity

Presentation: Admitted from the ED with acute shortness of breath, confusion, and hypotension

Vitals on ICU arrival:

• Temp: 38.6°C

• HR: 125 bpm

• BP: 82/50 mmHg

• RR: 28/min

• SpO2: 85% on 6 L O2 via nasal cannula

Exam:

• Confused, anxious, diaphoretic

• Lung: bibasilar crackles

• Heart: tachycardic, no murmurs

• Abdomen: soft, non-tender

• Extremities: cool, delayed cap refill

• Skin: mottled

Labs:

• WBC: 18,500 /mm³

• Lactate: 4.2 mmol/L

• Creatinine: 2.1 mg/dL (baseline 1.6)

• BUN: 38 mg/dL

• Na/K/Cl: 136/5.3/102 mmol/L

• ABG on 6 L O2: pH 7.29, PaCO2 32 mmHg, PaO2 60 mmHg, HCO3 16

• Troponin: mildly elevated (0.08 ng/mL)

Imaging:

• CXR: Bilateral patchy infiltrates, more on the right

• Bedside echocardiogram: LVEF ~40%, no pericardial effusion

Initial Impression:

• Septic shock vs cardiogenic shock with acute hypoxemic respiratory failure

• Acute kidney injury on CKD

• Possible pneumonia (community-acquired)

ICU Management

1. Immediate Assessment and Resuscitation

• Airway: Patient is hypoxemic, tachypneic, altered mental status → prepare for intubation if O2 doesn’t improve. Consider NIV if alert and cooperative.

• Breathing: Start high-flow O2 (HFNC) or prepare for mechanical ventilation

• Circulation: Hypotensive → start IV fluids carefully (crystalloids 30 mL/kg) but monitor for pulmonary edema

• Disability: GCS 13 (confused) → monitor neurological status

• Exposure: Fever, mottling → look for sources of infection

2. Investigations

• Blood cultures ×2

• Urine culture and urinalysis

• Sputum culture

• Lactate trend

• ECG for arrhythmias or ischemia

• Repeat labs: CBC, CMP, ABG, lactate

• Consider CT chest if pneumonia pattern unclear

3. Monitoring

• Continuous cardiac monitoring

• Strict urine output monitoring (Foley)

• Central line if requiring vasopressors

• Arterial line for BP monitoring

4. Pharmacologic Management

• Broad-spectrum antibiotics within 1 hour: e.g., piperacillin-tazobactam + vancomycin

• Vasopressors if hypotension persists after fluids: Norepinephrine first-line

• Stress ulcer prophylaxis: PPI (e.g., pantoprazole)

• DVT prophylaxis: LMWH if no bleeding

• Glycemic control: Insulin infusion (target 140–180 mg/dL)

5. Respiratory Support

• If intubated:

  • Low tidal volume ventilation (6 mL/kg ideal body weight)

  • PEEP titrated to oxygenation

  • Monitor plateau pressures (<30 cm H2O)

• Daily weaning trials once stabilized

6. Renal Support

• Monitor urine output closely

• Adjust medications for kidney function

• Consider RRT (CRRT) if oliguric AKI with rising creatinine, acidosis, or hyperkalemia

7. Hemodynamic Optimization

• Consider dobutamine if low cardiac output

• Monitor fluid responsiveness with echo or dynamic measures

• Balance fluids carefully due to pulmonary edema risk

8. Source Control

• If pneumonia: supportive care, antibiotics

• If urinary tract infection: remove obstructive catheter

• Drain any abscess if present

9. Daily ICU Goals

• Ventilator weaning plan

• Daily labs and culture review

• Sedation minimization

• Early mobilization as tolerated

• Nutrition (enteral if possible)

10. Family Communication

• Prognosis discussion: septic shock has high mortality in elderly with comorbidities

• Goals of care conversation early