Intensive Care
What is Intensive Care (Critical Care Medicine)?
Intensive care (or critical care medicine) is a medical specialty dedicated to the management of patients with or at risk of developing life-threatening organ failure. These patients require continuous monitoring 24 hours a day, invasive monitoring, and organ support therapies (mechanical ventilation, vasopressors, renal replacement therapy, circulatory support).
In France and Europe, a distinction is made between:
- Intensive care (level 3 critical care): management of the most severe patients (multiorgan failure, invasive mechanical ventilation, vasopressors).
- High dependency unit (level 2 care): close monitoring, non-invasive ventilation (NIV), post-operative care after major surgery, single organ failure.
In Tunisia, intensive care units (ICUs) and high dependency units are present in university hospitals (CHUs) and some private clinics, with teams trained according to international standards (SRLF, ESICM).
Which Patients are Admitted to Intensive Care?
Reasons for ICU admission are numerous and cover all medical and surgical specialties:
Medical Emergencies
- Acute respiratory distress: ARDS, hypoxemic pneumonia, massive pulmonary embolism, COPD exacerbation with acidosis, severe acute asthma.
- Shock (circulatory failure): septic shock, cardiogenic shock, hemorrhagic shock, obstructive shock (tamponade, tension pneumothorax, massive PE).
- Acute neurological distress: coma (GCS ≤ 8), severe traumatic brain injury, massive ischemic or hemorrhagic stroke, bacterial meningitis, status epilepticus.
- Acute kidney injury (AKI): anuric, severe hyperkalemia, severe metabolic acidosis.
- Acute liver failure (fulminant hepatitis) or decompensated chronic liver disease (cirrhosis with encephalopathy, GI bleeding).
- Severe sepsis and septic shock (infectious cause).
- Severe poisonings (barbiturates, cyanide, paraquat, opioids).
- Severe metabolic disorders: diabetic ketoacidosis, hyperosmolar coma, hyperkalemia, acute adrenal insufficiency.
Post-Operative Care and Trauma
- Post-operative major surgery: cardiac surgery (bypass, valve, transplant), neurosurgery (brain tumor, hematoma), thoracic surgery (pneumonectomy), major abdominal surgery (duodenopancreatectomy, liver/kidney transplant).
- Polytrauma (ISS > 15) with multiorgan failure.
- Severe traumatic brain injury (Glasgow Coma Scale ≤ 8).
- Extensive burns (> 20% of body surface area in adults).
Decompensated Chronic Diseases
- Decompensated heart failure refractory to diuretics.
- Decompensated COPD with respiratory acidosis (pH < 7.35).
- End-stage chronic kidney disease with complication (hyperkalemia, fluid overload, uremic pericarditis).
- Decompensated cirrhosis (refractory ascites, hepatic encephalopathy, GI bleeding).
- Cystic fibrosis with acute respiratory failure.
How is Intensive Care Managed in Tunisia?
Management is structured and based on a 24/7 multidisciplinary team: intensivists, specialized nurses, physiotherapists, nursing assistants, psychologists, dietitians, social workers.
Continuous Monitoring and Surveillance
- Cardiac monitor (5-lead): heart rate, rhythm, arrhythmias (atrial fibrillation, ventricular tachycardia).
- Pulse oximetry (SpO2): oxygen saturation, target ≥ 90-95%.
- Non-invasive blood pressure (NIBP): periodic measurement (every 5-30 min).
- Invasive arterial pressure (radial or femoral arterial catheter): continuous measurement of mean arterial pressure (MAP), allows repeated blood gas sampling.
- Central venous pressure (CVP) (central venous catheter): estimation of blood volume (preload).
- Hourly diuresis: urinary catheter with graduated collector.
- Core temperature: esophageal or bladder probe, or tympanic thermometer.
- Advanced monitoring (as indicated):
- Pulmonary artery catheter (Swan-Ganz): cardiac output, pulmonary pressures, vascular resistances.
- PiCCO (pulse contour analysis): continuous cardiac output, intrathoracic and extravascular volumes.
- Echocardiography (transesophageal or transthoracic): ventricular function, causes of shock.
- Intracranial pressure (ICP) (intraparenchymal transducer): severe traumatic brain injury.
Ventilatory Support (Respiratory Failure)
- Simple oxygen therapy (nasal cannula, mask): for moderate needs (SpO2 > 92% with FiO2 < 40%).
- High-flow nasal oxygen (Optiflow): flow 30-60 L/min, FiO2 21-100%, for moderate hypoxemia (PaO2/FiO2 200-300).
- Non-Invasive Ventilation (NIV): nasal or facial mask, for COPD exacerbation (pH 7.25-7.35), cardiogenic pulmonary edema, immunocompromised patients, weaning.
- Invasive mechanical ventilation (intubation): tracheal tube or tracheostomy tube. Modes:
- VC (Volume Control): fixed tidal volume (4-8 mL/kg), used in acute phase.
- PC (Pressure Control): fixed inspiratory pressure, better tolerated if leaks.
- SIMV (Synchronized Intermittent Mandatory Ventilation): synchronized mandatory cycles + spontaneous cycles.
- PSV (Pressure Support Ventilation): inspiratory assistance on spontaneous cycles, used during weaning.
- Lung protection (ARDS): low tidal volume (4-6 mL/kg), high PEEP (5-15 cmH2O), plateau pressure < 30 cmH2O, prone positioning (16h/day) if PaO2/FiO2 < 150.
- Venovenous ECMO (VV ECMO): extracorporeal membrane oxygenation for refractory ARDS (PaO2/FiO2 < 80).
Circulatory Support (Shock)
- Fluid resuscitation: crystalloids (0.9% NaCl or Ringer's Lactate) 30 mL/kg over 3-6 hours, reassessment by echocardiography (respiratory variability of the inferior vena cava, aortic VTI).
- Vasopressors (first line: norepinephrine): target MAP ≥ 65 mmHg. Initial dose 0.05-0.1 µg/kg/min, titrate up to 0.5-1 µg/kg/min. If high doses (> 0.5-1 µg/kg/min) and resistance: consider adding vasopressin (0.03-0.04 IU/min) or epinephrine (0.05-0.2 µg/kg/min).
- Inotropes (dobutamine): if cardiogenic shock (low cardiac output). Dosage: 2.5-20 µg/kg/min.
- Mechanical circulatory support:
- Venoarterial ECMO (VA ECMO): for refractory cardiogenic shock.
- Intra-aortic balloon pump (IABP): for post-infarct cardiogenic shock (2024 guidelines less recommended).
- Ventricular assist device (VAD): for end-stage heart failure (bridge to transplant).
Renal Replacement Therapy (Acute Kidney Injury - AKI)
- Continuous hemofiltration (CVVHDF - Continuous Veno-Venous Hemodiafiltration): preferred dialysis technique in intensive care (hemodynamic tolerance). Target dose: 25-35 mL/kg/h. Indications: anuric AKI (diuresis < 0.3 mL/kg/h for > 6h), refractory hyperkalemia > 6-6.5 mmol/L, metabolic acidosis pH < 7.2, fluid overload with pulmonary edema refractory to diuretics, urea > 30-40 mmol/L.
- Intermittent hemodialysis (IHD): for hemodynamically stable patients.
- Peritoneal dialysis: sometimes used in children or in case of contraindication to central venous access.
Sedation and Analgesia (Ventilated Patients or Agitation)
- Daily assessment: RASS (Richmond Agitation-Sedation Scale), target RASS 0 (calm, awake) to -2 (arousable, eye contact) for stable patients, and RASS -3 to -5 for severe ARDS, severe intracranial hypertension (ICH), refractory shock.
- Sedatives: propofol (1-3 mg/kg/h), midazolam (0.05-0.2 mg/kg/h), dexmedetomidine (0.2-0.7 µg/kg/h).
- Analgesics: fentanyl (0.5-2 µg/kg/h), morphine, sufentanil, nefopam, IV paracetamol.
- Neuromuscular blockers (paralytics): atracurium, cisatracurium (limited indications: severe ARDS, refractory ICH, compartment syndrome, refractory shock).
Artificial Nutrition
- Preferential enteral nutrition: nasogastric tube (or nasojejunal if gastric intolerance), continuous infusion. Target: 20-25 kcal/kg/day (up to 30 kcal/kg/day during recovery). Protein intake: 1.2-2 g/kg/day.
- Parenteral nutrition (intravenous): in case of severe digestive intolerance (ileus, obstruction, GI bleeding, necrotizing acute pancreatitis).
- Supplements: vitamins (B1, B6, B12, C, D), trace elements (zinc, selenium, copper).
Supportive Care and Complication Prevention
- Pressure ulcer prevention: alternating pressure mattresses, position changes every 2 hours, protection of pressure points (heels, sacrum, occiput).
- Deep vein thrombosis (DVT) prevention: low molecular weight heparins (LMWH) (enoxaparin 40 mg/day unless contraindicated), elastic compression stockings, intermittent pneumatic compression (IPC).
- Stress ulcer prophylaxis: proton pump inhibitors (PPIs) (esomeprazole, pantoprazole) if ventilated patient, coagulopathy, corticosteroid therapy, extensive burns, or severe stress.
- Prevention of nosocomial infections: hand hygiene, oral care, sterile tracheal suction, ventilator circuit changes (protocol), early catheter removal (venous, arterial, urinary), antibiotic de-escalation, isolation if Multi-Drug Resistant Organisms (MDRO).
- Strict glycemic control: target blood glucose 6-10 mmol/L (IV insulin if necessary, avoid hypoglycemia).
- Delirium prevention: spatial-temporal reorientation, light therapy (respect day/night cycle), naps, early mobilization protocol, avoid benzodiazepines (except alcohol withdrawal or deep sedation).
- Early respiratory and physical therapy: bronchial clearance, in-bed mobilization (passive then active), sitting up, early gait training as soon as possible.
What are the Risks and Complications of Intensive Care?
ICU patients are exposed to iatrogenic and non-iatrogenic complications:
- Nosocomial infections: ventilator-associated pneumonia (VAP) (10-30% of patients ventilated > 48h), central line-associated bloodstream infection (CLABSI) (1-5%), catheter-associated urinary tract infection (CAUTI), sinusitis.
- Barotrauma: pneumothorax, pneumomediastinum, subcutaneous emphysema (especially if high PEEP).
- Tracheal injuries (post-intubation): tracheal stenosis, granuloma, laryngitis, ulceration.
- Intensive Care Unit-Acquired Weakness (ICUAW): 30-50% of patients with stay > 7 days, delaying motor recovery.
- Delirium: 30-50% of patients (agitation, confusion, hallucinations), increasing ventilation duration and mortality.
- Pressure ulcers (decubitus ulcers): 10-30% of stays > 5 days, especially on heels, sacrum, occiput.
- Deep vein thrombosis (DVT) and pulmonary embolism (PE) if prophylaxis is insufficient.
- Post-traumatic stress disorder (PTSD): 30-50% of ICU survivors.
- Depression, anxiety, cognitive disorders: common after a prolonged ICU stay (Post-Intensive Care Syndrome - PICS).
- Iatrogenic hemorrhages (arterial puncture, catheter insertion, anticoagulants, thrombolysis).
Prognosis for Intensive Care Patients
Prognosis depends on the underlying pathology, severity at admission (SOFA score, IGS II, APACHE II), age, and comorbidities. In Tunisia, adjusted mortality scores are comparable to European averages.
- SOFA (Sequential Organ Failure Assessment): score 0-24.
- SOFA < 6: mortality < 5%
- SOFA 7-12: mortality 15-30%
- SOFA 13-17: mortality 40-60%
- SOFA 18-24: mortality 70-90%
- Mortality by pathology:
- Myocardial infarction (STEMI): 3-8% (with primary angioplasty)
- Severe ARDS (COVID-19): 40-60%
- Severe sepsis: 20-30%
- Septic shock: 40-60%
- Polytrauma (ISS > 25): 10-20%
- Severe traumatic brain injury (GCS ≤ 8): 30-40%
- In-hospital cardiac arrest: 50-80%
- Post-infarction cardiogenic shock: 40-50%
What to Do After an Intensive Care Stay? (Post-Intensive Care Syndrome - PICS)
Discharge from intensive care (duration from 2-3 days to several months) is followed by a phase of post-intensive care rehabilitation (PICS):
- Intensive physical therapy: restoration of muscle strength (acquired weakness), gait retraining, balance, fall prevention.
- Speech therapy / neuropsychology: cognitive rehabilitation (memory, attention, executive functions, language), swallowing rehabilitation (risk of aspiration).
- Occupational therapy: relearning activities of daily living (dressing, washing, eating), home adaptation (wheelchair, medical bed, grab bars).
- Psychologist / Psychiatrist: management of post-traumatic stress disorder (PTSD), anxiety, depression, behavioral disorders.
- Specialized follow-up: cardiology (post-cardiac arrest, post-ICP), pulmonology (post-ARDS, post-ventilation), neurology (post-TBI, post-stroke), nephrology (post-AKI).
- Social worker: assistance with returning to work, disability recognition, financial aid, orientation to rehabilitation facilities.
Why Choose Tunisia for Intensive Care?
Tunisia has high-level intensivists (critical care physicians), trained in the best European centers. Intensive care units in university hospitals and private clinics are modern: invasive monitoring (arterial and central catheters, PiCCO, Swan-Ganz), latest generation ventilators (Dräger, Hamilton, Maquet), continuous hemofiltration machines (Prismaflex, MultiFiltrate), high-resolution ultrasound machines, ECMO capability (venovenous and venoarterial) in university hospitals.
Advantages
- Compliance with international guidelines (SRLF, ESICM, Surviving Sepsis Campaign, ERC, ATLS).
- 24/7 medical, surgical, neurosurgical, cardiac intensive care available.
- Nurse-to-patient ratio compliant with international standards (1 nurse for 2-3 patients, sometimes 1:1 for ECMO, CVVHDF, severe instability).
- All-inclusive packages: some private clinics offer packages for ICU stays including hospitalization, invasive monitoring, mechanical ventilation, sedation, vasopressors, hemofiltration (if necessary), enteral nutrition, daily laboratory tests, imaging (ultrasound, X-ray, CT scan).
- Management of foreign patients: simplified administrative procedures, coordination with international insurance companies, multilingual reception (French, English, Arabic, Italian).
Quality Indicators in Intensive Care
In Tunisia, ICUs in university hospitals and private clinics follow quality indicators:
- Standardized mortality ratio (SMR): comparable to European averages (not inferior).
- Ventilator-associated pneumonia (VAP) incidence: < 15-20%.
- Central line-associated bloodstream infection (CLABSI) incidence: < 3-5 per 1000 catheter-days.
- Duration of weaning: median duration of invasive ventilation < 7-10 days.
- 48-hour ICU readmission rate: < 5-10%.