What is Central Venous Catheterization?
Central Venous Catheterization (CVC) is the placement of a catheter tip into a large central vein — typically the Superior Vena Cava (SVC), Inferior Vena Cava (IVC), or the right atrium junction. It is one of the most commonly performed invasive procedures in critical care medicine.
The Seldinger technique (1953) revolutionized vascular access: a needle is used to puncture the vein, a guidewire is threaded through the needle, the needle is removed, a dilator is passed over the wire, and finally the catheter is advanced into position.
Types of Central Venous Catheters
Non-Tunneled CVC
- • Most common in ICU/ED settings
- • Triple-lumen (7 Fr) most frequently used
- • Short-term use (< 14 days typically)
- • Percutaneous, Seldinger technique
Tunneled CVC (Hickman/Broviac)
- • Long-term venous access (> 14 days)
- • Dacron cuff provides infection barrier
- • Subcutaneous tunnel reduces CLABSI
- • Chemo, TPN, hemodialysis
PICC Line
- • Inserted via basilic/cephalic vein
- • Tip in SVC junction
- • Lower mechanical complication risk
- • Weeks to months of use
Implanted Port (Port-a-Cath)
- • Completely subcutaneous reservoir
- • Accessed with Huber needle
- • Lowest infection rate of all CVCs
- • Ideal for intermittent long-term access
Indications & Contraindications
Indications
Hemodynamic Monitoring
CVP measurement, ScvO₂ monitoring, PA catheter insertion, continuous cardiac output monitoring (PiCCO/EV1000)
Drug Administration
Vasopressors (Norepinephrine, Vasopressin, Dopamine), concentrated KCl, Amiodarone infusions, chemotherapy, hyperosmolar solutions (TPN > 900 mOsm/L)
Inadequate Peripheral Access
Severe burns, obesity, IV drug use with sclerosed veins, profound shock with collapsed peripheral veins, prolonged resuscitation
Specialized Therapies
Hemodialysis/CRRT (large bore dialysis catheter), plasmapheresis, transvenous pacing, rapid volume resuscitation, frequent blood sampling
Air Embolism Aspiration
Multi-orifice catheter placed at SVC–RA junction for aspiration of air in venous air embolism emergencies
Contraindications
Absolute
• Infection/cellulitis at insertion site
• Known complete thrombosis of target vein
• Patient refusal (competent patient)
• Distorted anatomy post-surgery/trauma at site
Relative
• Coagulopathy: INR > 1.5, Platelets < 50,000 — prefer compressible site (IJ, femoral). Consider platelet/FFP transfusion
• Contralateral pneumothorax: Avoid subclavian/IJ on functioning side
• AICD/Pacemaker leads: Risk of lead dislodgement
• Morbid obesity: Landmarks obscured — US mandatory
• Uncooperative patient: Sedation or alternative site
• Hyperinflated lungs (COPD/asthma): Increased pneumothorax risk with subclavian approach
Clinical Pearl: No absolute contraindication exists if the CVC is lifesaving. In emergencies, the benefit-risk ratio favors insertion even in coagulopathic patients — choose a compressible site and use ultrasound.
Central Venous Access Sites
IJ
Internal Jugular Vein
PREFERRED SITE — 1st Line in ICU
Internal Jugular Vein
PREFERRED SITE — 1st Line in ICUAnatomy
- • Runs within carotid sheath lateral to carotid artery
- • Between the two heads of SCM (sternal & clavicular)
- • Superficial: 1–2 cm depth in most patients
- • Joins subclavian → brachiocephalic → SVC
- • Right IJ preferred: straight path to SVC, no thoracic duct risk
Three Approaches
- • Central (Dailey): Apex of triangle between SCM heads, 30° needle angle toward ipsilateral nipple
- • Anterior: Midpoint of sternal head of SCM, lateral to carotid pulsation
- • Posterior: EJV crossing posterior border of SCM, direct toward sternal notch
Advantages
- • Highest US-guided success rate (>98%)
- • Low pneumothorax risk (<0.1% with US)
- • Compressible site — safer in coagulopathy
- • Reliable landmarks even in obese patients
Disadvantages
- • Carotid artery puncture risk (6–9% landmark)
- • Patient discomfort & difficult dressing
- • Interferes with tracheostomy care
- • Left IJ: thoracic duct injury risk, longer/curved path to SVC
SC
Subclavian Vein
LOWEST INFECTION RATE
Subclavian Vein
LOWEST INFECTION RATEAnatomy
- • Continuation of axillary vein at lateral border of 1st rib
- • Runs between clavicle (anterior) and 1st rib (posterior)
- • Separated from subclavian artery by anterior scalene muscle
- • Lung apex lies posteriorly — pneumothorax risk
Infraclavicular Approach
- • Insertion: junction of medial 1/3 and lateral 2/3 of clavicle
- • Aim toward sternal notch (finger in notch as target)
- • Needle walks under clavicle, bevel up
- • Keep needle parallel to floor (avoid lung)
Advantages
- • Lowest CLABSI rate (per CDC/SHEA guidelines)
- • Comfortable for patient, easy to dress
- • Catheter well-anchored (less migration)
- • Preferred for long-term access & TPN
Disadvantages
- • Highest pneumothorax rate (1.5–3% landmark)
- • Non-compressible site — avoid in coagulopathy
- • Pinch-off syndrome (catheter compressed)
- • US guidance technically more difficult (clavicle shadow)
FV
Femoral Vein
EMERGENCY / RESUSCITATION ACCESS
Femoral Vein
EMERGENCY / RESUSCITATION ACCESSAnatomy — "NAVEL" Mnemonic
- • Nerve – Artery – Vein – Empty space – Lymphatics
- • Femoral vein is MEDIAL to femoral artery
- • Below inguinal ligament (midpoint between ASIS and pubic symphysis)
- • Insert 1–2 cm below inguinal ligament to avoid retroperitoneal space
Advantages
- • No pneumothorax risk
- • Compressible (bleeding control easy)
- • Can be placed during CPR (no interruption)
- • Easiest landmarks for beginners
Disadvantages
- • Highest infection rate (groin flora)
- • Higher DVT risk
- • Inaccurate CVP (abdominal pressure effect)
- • Limits patient mobility
- • Not suitable for CVP-guided resuscitation
Site Comparison Matrix
| Parameter | IJ | Subclavian | Femoral |
|---|---|---|---|
| Pneumothorax | Low | High | None |
| Infection Risk | Moderate | Lowest | Highest |
| Arterial Puncture | Carotid | Subclavian A | Femoral A |
| Compressible | ✅ Yes | ❌ No | ✅ Yes |
| CVP Accuracy | ✅ Excellent | ✅ Excellent | ⚠️ Unreliable |
| US Guidance | Easy | Moderate | Easy |
Step-by-Step Procedure
Pre-Procedure Checklist
Modified Seldinger Technique
Preparation & Positioning
Patient supine, 15° Trendelenburg (IJ/SC) to distend veins and reduce air embolism risk. Head turned 30° to contralateral side (IJ). Chlorhexidine 2% + 70% alcohol skin prep — allow 30 seconds drying. Apply full-body sterile drape.
Ultrasound Survey & Local Anesthesia
Identify vein with linear probe (5–10 MHz). Confirm: compressibility, non-pulsatile, augments with Valsalva. Mark trajectory. Infiltrate 1–2% Lidocaine (3–5 mL) along the planned needle track, aspirating before each injection.
Venipuncture Under Real-Time US
18G introducer needle, attached to syringe, advance under real-time US guidance at 30–45° angle. Maintain negative pressure. Dark, non-pulsatile blood return confirms venous access. If bright red pulsatile blood → arterial puncture → remove immediately, hold pressure 10 min.
Guidewire Insertion
J-tip guidewire advanced through needle — should pass without resistance. Insert to 20 cm mark. Watch ECG for arrhythmias (ectopics/VT if wire touches RA/RV wall). Never lose grip of the guidewire. Confirm intravascular position with US.
Dilation & Catheter Advancement
Nick skin at wire entry with scalpel. Pass dilator over wire with gentle rotational motion — only 2–3 cm into vein (avoid deep insertion → vessel perforation). Remove dilator. Thread catheter over wire to appropriate depth: Right IJ 12–15 cm, Left IJ 15–18 cm, Subclavian 15–17 cm.
Confirmation & Securing
Aspirate all ports (blood return confirms intravascular position). Flush with saline. Suture catheter in place (2-0 silk). Apply chlorhexidine-impregnated dressing. Obtain CXR for tip position (carina level ≈ SVC–RA junction T4–T5) and pneumothorax exclusion. Document: site, side, catheter type, # of attempts, complications.
Complications
Mechanical Complications (Immediate)
CriticalPneumothorax
Incidence: 1.5–3% subclavian (landmark), 0.1–0.5% IJ, <0.1% with US guidance
Mechanism: Needle punctures visceral pleura → air enters pleural space
Presentation: Dyspnea, pleuritic chest pain, decreased breath sounds, hypoxia. May be delayed 24–48 hrs (occult pneumothorax)
Diagnosis: CXR (upright, expiratory film more sensitive), bedside US (absent lung sliding, absent comet tails, presence of lung point)
⚠ Tension pneumothorax: Hypotension, tracheal deviation, JVD, cardiovascular collapse → IMMEDIATE needle decompression (2nd ICS MCL with 14G) → chest tube
CriticalArterial Puncture / Cannulation
Incidence: Carotid 6–9% (IJ landmark), 3–4% subclavian artery
Recognition: Bright red pulsatile blood, high-pressure backflow, arterial waveform on transduction. If any doubt → transduce before dilating
Catastrophic scenario: Unrecognized large-bore arterial cannulation → hemorrhage, stroke (carotid), hemothorax (subclavian), pseudoaneurysm, AV fistula
CriticalAir Embolism
Incidence: Rare but potentially fatal (lethal volume 3–5 mL/kg)
Mechanism: Negative intrathoracic pressure draws air through open catheter hub or unsecured port, especially during inspiration in upright/hypovolemic patients
Presentation: Sudden dyspnea, cardiovascular collapse, "mill wheel" murmur, churning sound on precordial auscultation, decreased ETCO₂
ModerateArrhythmias
Incidence: Atrial ectopics 20–40%, sustained VT/VF rare
Mechanism: Guidewire or catheter tip stimulates endocardium of RA/RV
Management: Withdraw wire/catheter until arrhythmia resolves. If persistent VT → standard ACLS. ECG-guided positioning can prevent.
ModerateHemothorax / Hemomediastinum
Arterial or SVC perforation → bleeding into pleural/mediastinal space. Presents with hypotension, widened mediastinum on CXR, large pleural effusion. May require emergent thoracotomy/sternotomy.
ModerateNerve Injury & Thoracic Duct Injury
Brachial plexus: Paresthesia, motor weakness (subclavian approach). Phrenic nerve: Diaphragmatic paralysis. Recurrent laryngeal: Hoarseness (IJ). Thoracic duct: Chylothorax — left IJ/SC approach. Milky pleural fluid with high triglycerides (> 110 mg/dL).
Infectious Complications
CriticalCLABSI (Central Line-Associated Bloodstream Infection)
Incidence: 0.8–5.2 per 1000 catheter-days (varies by ICU type)
Pathogens: Coagulase-negative Staph (30–40%), S. aureus (10–20%), Enterococcus (10%), Candida spp. (10–15%), Gram-negatives (20–25%)
Risk Factors: Duration > 7 days, femoral site, frequent manipulation, TPN infusion, immunosuppression, poor insertion technique, break in sterile protocol
Diagnosis: ≥2 blood cultures (1 peripheral + 1 through CVC), differential time to positivity (>2 hrs earlier from CVC suggests CLABSI)
Mortality: 12–25% attributable mortality; $45,000 additional cost per episode
ModerateExit Site / Tunnel Infection
Erythema, induration, tenderness, or purulent discharge within 2 cm of catheter exit. Tunnel infection extends >2 cm along subcutaneous tract. Requires catheter removal + systemic antibiotics.
Thrombotic Complications
ModerateCatheter-Related DVT
Incidence: Symptomatic 2–5%, subclinical by US/venography up to 33–67%
Risk Factors: Femoral > subclavian > IJ, larger catheter bore, malposition, hypercoagulable states, cancer, prior DVT
Presentation: Limb swelling, pain, collateral vein distension. Upper extremity DVT may → PE (6%), post-thrombotic syndrome
Diagnosis: Doppler US (loss of compressibility, absent flow augmentation), CT venography
ModerateFibrin Sheath / Catheter Occlusion
Fibrin sleeve forms within 24 hrs on virtually all CVCs. Causes: inability to aspirate (withdrawal occlusion), sluggish flow, total occlusion. Treat with tPA/Alteplase intraluminal dwell (2 mg in 2 mL, dwell 30–120 min).
Late & Other Complications
CriticalCardiac Tamponade / Vessel Erosion
Catheter tip erodes through SVC/RA wall → pericardial effusion → tamponade. Often delayed (days-weeks). Presents with Beck's triad: hypotension, JVD, muffled heart sounds. Echocardiography confirms. Requires emergent pericardiocentesis. Prevention: tip at SVC–RA junction (not deep in RA).
ModerateCatheter Malposition / Migration
Tip in IJ (from subclavian), contralateral brachiocephalic, azygos vein, or RV. Malpositioned catheter → inaccurate CVP, risk of perforation, arrhythmias, extravasation of infusate. Always confirm on CXR. Reposition under fluoroscopy if needed.
ModerateCatheter Fracture / Embolization
Catheter shears between clavicle and first rib (pinch-off syndrome — subclavian). Fragment embolizes to RA/RV/PA. Requires interventional radiology retrieval with snare catheter. Prevention: avoid medial subclavian insertion, monitor for positional dysfunction.
Complications Management
Pneumothorax Management
Observation + serial CXR every 6–12 hrs. High-flow O₂ (accelerates reabsorption by 4x). Asymptomatic → conservative.
Chest tube (small bore 14–16 Fr pigtail preferred, or 24–28 Fr if hemothorax suspected). Connect to -20 cmH₂O suction. Serial CXR. Remove when air leak resolves and lung re-expanded.
EMERGENCY: Immediate needle decompression → 14G needle, 2nd ICS midclavicular line or 5th ICS anterior axillary line → hissing air confirms diagnosis → immediate chest tube insertion. Do NOT wait for CXR.
Arterial Puncture Management
Remove needle immediately. Apply firm direct pressure for 10–15 minutes (carotid/femoral) or until hemostasis. Avoid IJ/SC on the same side for future attempts. No heparin for 24 hrs.
Do NOT remove. Leave catheter in place. Emergent vascular surgery or IR consultation. CTA to assess damage. Removal under direct surgical repair or covered stent. Risk: massive hemorrhage, stroke (carotid), pseudoaneurysm, AV fistula.
Air Embolism Management
- Immediately clamp/occlude the open port
- Position patient in left lateral decubitus + Trendelenburg (Durant's maneuver) — traps air in RV apex away from RVOT
- 100% FiO₂ via high-flow — accelerates nitrogen reabsorption
- If CVC in situ → attempt aspiration of air from distal port
- Hemodynamic support: IV fluids, vasopressors as needed
- CPR if cardiac arrest
- Consider hyperbaric oxygen if available and massive embolism
- TEE to quantify residual air if hemodynamically significant
CLABSI Prevention Bundle (IHI/CDC)
Insertion Bundle
- ✅ Hand hygiene before & after
- ✅ Maximum sterile barrier precautions
- ✅ Chlorhexidine 2% skin antisepsis
- ✅ Optimal catheter site selection (avoid femoral)
- ✅ Trained/supervised operator
- ✅ Procedure checklist with empowered observer
Maintenance Bundle
- ✅ Daily necessity review — remove ASAP
- ✅ Chlorhexidine-impregnated dressing
- ✅ Dressing changes Q7 days (transparent) or Q2 days (gauze)
- ✅ Hub scrub 15 sec with alcohol before access
- ✅ Dedicated line for TPN
- ✅ Minimize line breaks/disconnections
📊 Impact: Full bundle compliance reduces CLABSI by up to 66–70%. "Zero CLABSI" initiatives in ICUs have proven feasible with sustained compliance.
Catheter-Related DVT Management
• Anticoagulation: LMWH (Enoxaparin 1 mg/kg BID) or UFH infusion → transition to warfarin (INR 2–3) or DOAC. Minimum 3 months if catheter removed; as long as catheter remains + 3 months after removal.
• Catheter removal: Not always necessary if still needed and functioning. Remove if: infected, no longer needed, anticoagulation contraindicated, or worsening despite treatment.
• Thrombolysis: Consider catheter-directed tPA for massive symptomatic upper extremity DVT with limb threat.
• Prevention: Smallest catheter possible, avoid femoral, daily assessment for ongoing need, consider prophylactic anticoagulation in high-risk patients.
Arrhythmia Management
• Atrial/ventricular ectopics during insertion: Withdraw guidewire/catheter 2–3 cm → ectopics resolve. Never advance further.
• Sustained VT: Withdraw wire immediately. If VT persists → Amiodarone 150 mg IV over 10 min or synchronized cardioversion per ACLS. Check K⁺, Mg²⁺.
• Prevention: Limit guidewire insertion to 20 cm. Use intracavitary ECG (large P wave amplitude indicates RA → withdraw). Never leave wire unattended in patient.
Clinical Pearls & Expert Tips
🔵 Ultrasound is Non-Negotiable
Real-time US guidance reduces mechanical complications by 57–71% (Cochrane 2015). It is the standard of care for IJ access and strongly recommended for all sites. Use short-axis (out-of-plane) for initial puncture, then confirm with long-axis. Always perform a pre-procedure survey to identify vessel patency, anatomy variants, and adjacent structures.
🟡 The "5-Finger Rule" for Tip Position
On CXR, ideal catheter tip position is at or just above the carina (T4–T5 level), which corresponds to the SVC–RA junction. Right-sided catheters should be parallel to SVC wall. A catheter abutting the wall at an angle risks erosion → tamponade. If the catheter tip crosses the midline on AP CXR, suspect malposition.
🟢 Transduction Before Dilation
If there is ANY doubt about venous vs arterial placement, always transduce pressure through the introducer needle before dilating. Venous pressure: low, non-pulsatile (0–8 mmHg). Arterial: pulsatile, high pressure. This simple step prevents catastrophic large-bore arterial cannulation. Alternatively, run a blood gas — PaO₂ >60 or oxygen saturation >95% = arterial.
🔴 Never Lose the Wire
Retained guidewire is a never event. One hand on the wire at ALL times. Count wire in, count wire out. Confirm wire is out before discarding kit. If wire is lost → STOP → urgent fluoroscopy → IR or surgical retrieval. Some institutions use wires with external safety markers/flags.
🟣 Trendelenburg & Air Embolism Prevention
Always place patient in Trendelenburg (15–30°) for IJ and subclavian insertion. This distends the target vein AND creates positive venous pressure to prevent air entrainment. During catheter exchanges, ask the patient to hum or perform Valsalva to maintain positive intrathoracic pressure during the moment the hub is open.
🩺 Daily Assessment: "Does This Line Still Need to Be Here?"
Every ICU rounds should include the question: "Can this central line come out today?" The single most effective intervention to reduce CLABSI is prompt removal. Document daily necessity. Consider de-escalation to PICC or peripheral access as patient improves. Target: remove within 72 hours if possible.
📋 Documentation Essentials
Always document: indication, consent, site/side, catheter type and size, number of lumens, number of attempts, use of ultrasound, skin prep used, confirmation of venous blood return in all ports, catheter depth at skin, complications encountered, CXR tip position. This is medicolegally critical and an institutional quality metric.
Key References
- • Seldinger SI. Catheter replacement of the needle in percutaneous arteriography. Acta Radiologica. 1953.
- • Lamperti M, et al. International evidence-based recommendations on US-guided vascular access. Intensive Care Med. 2012.
- • Marschall J, et al. Strategies to prevent CLABSI in acute care hospitals (SHEA/IDSA). Infection Control. 2014.
- • Parienti JJ, et al. Intravascular complications of CVCs by insertion site. NEJM. 2015.
- • Brass P, et al. US guidance for vascular access — Cochrane Review. 2015.
This guide is for educational purposes. Always follow your institutional protocols and guidelines.