CHAPTER 15 PRACTICAL PROCEDURES
GENERAL INFORMATION
Universal infection control precautions




ARTERIAL CANNULATION
Indications
Procedure
Arterial cannulation. You will need:
Universal precautions; sterile gloves
Syringe of local anaesthetic / needle
Syringe of heparinized saline flush
Arterial cannulae (usually 20 gauge or 22 gauge)
Decide which artery to cannulate. The radial artery of the non-dominant hand is usually preferred in the first instance. Alternatives include the ulnar, dorsalis pedis and posterior tibial arteries. It is pointless, however, to persist with attempts at peripheral arterial cannulation in patients who are hypotensive and ‘shut down’. The femoral and brachial arteries are useful during resuscitation of profoundly shocked patients. Ultrasound guidance is potentially useful at all sites to aid arterial cannulation, particularly in hypotensive patients and those whose landmarks are obscured by oedema or obesity.

Seldinger technique

Direct cannulation


Sampling from an arterial line
USE OF PRESSURE TRANSDUCERS




Zeroing transducers

CENTRAL VENOUS CANNULATION
Indications
Central venous access is almost universal in intensive care patients. Indications include:
Ultrasound guidance for vascular access
The use of ultrasound to guide central venous access procedures is recommended in all cases (NICE Guidance. Central venous catheters, ultrasound locating devices, Sept. 2002. www.nice.org.uk/guidance/TA49).



Traditional approaches to the central veins are described below.
Internal jugular vein
Right sided internal jugular vein cannulation is associated with a lower incidence of complications and higher incidence of correct line placement than other approaches. It is especially appropriate for patients with coagulopathy or those patients with lung disease in whom pneumothorax may be disastrous. It may be best avoided in those patients with carotid artery disease or those with raised intracranial pressure because of the risks of carotid puncture and of impaired cerebral venous drainage. Internal jugular cannulation is associated with a higher incidence of catheter infection than subclavian cannulation but both have a much lower infection rate than the femoral approach.
The internal jugular vein runs from the jugular foramen at the base of the skull (immediately behind the ear) to its termination behind the posterior border of the sternoclavicular joint, where it combines with the subclavian vein to become the brachiocephalic vein. Throughout its length it lies lateral, first to the internal and then common carotid arteries, within the carotid sheath, behind the sternomastoid muscle (Fig. 15.1A). Ultrasound demonstrates the close proximity of the vein to the carotid artery (Fig. 15.1B). Many approaches to the internal jugular vein have been described. A typical landmark approach is from the apex of the triangle formed by the two heads of the sternomastoid (Fig. 15.1).




External jugular vein
The external jugular vein lies superficially in the neck, running down from the region of the angle of the jaw, across the sternomastoid before passing deep to drain into the subclavian vein. It can be used to provide central venous access, particularly in emergency situations when a simple large-bore cannula can be used for the administration of drugs and resuscitation fluids. Longer central venous catheters can be sited via the external jugular but the angle of entry to the subclavian vein often leads to inability to pass guide wires centrally and results in a high failure rate.
Subclavian vein
The subclavian vein is a continuation of the axillary vein. It runs from the apex of the axilla behind the posterior border of the clavicle and across the first rib to join the internal jugular vein, forming the brachiocephalic vein behind the sternoclavicular joint. See Fig. 15.2.


Femoral vein


Procedure
Central venous cannulation. You will need:
Universal precautions; sterile gown and gloves
5-mL syringe of local anaesthetic
Heparinized saline to flush line











Position on chest X-ray
The catheter should lie along the long axis of the vessel and the distal segment and tip should be in the superior vena cava (SVC) or at the junction of the SVC and right atrium but ideally outside the pericardial reflection. Catheters below this level may perforate the heart and cause cardiac tamponade. The pericardial reflection lies below the level of the carina and this can therefore be used as a radiological marker. Catheters placed via subclavian veins of left internal jugular vein must not be allowed to lie with the tip abutting the wall of the superior vena cava. This may cause pain, perforation and accelerated thrombus formation. Either advance the catheter to lie in the long axis of the SVC or pull it back to lie in the brachiocephalic vein. See Fig. 15.4.
COMMON PROBLEMS DURING CENTRAL VENOUS ACCESS
Cannot find the vein
Check position (ultrasound and / or landmarks) and try again. If unsuccessful do not persist with repeated passages of the needle in the hope of striking oil! You may have misinterpreted the landmarks, or the vein may be absent or occluded (e.g. with thrombus). Seek help.
Complications
Complications of central venous cannulation depend in part on the route used but include those in Box 15.2.
Early | Late |
---|---|
Arrhythmias | Infection |
Vascular injury | Thrombosis |
Pneumothorax | Embolization |
Haemothorax | Erosion/perforation of vessels |
Thoracic duct injury (chylothorax) | Cardiac tamponade |
Cardiac tamponade | AV fistula |
Neural injury | |
Embolization (including guide wire) | |
AV fistula |
CHANGING AND REMOVING CENTRAL VENOUS CATHETERS
Line colonization with bacteria and fungi is common and there is no evidence that changing lines on a regular basis (e.g. every 5–7 days) is of benefit. (See Catheter-related sepsis, p. 340.)
Changing catheters over a wire

LARGE-BORE INTRODUCER SHEATHS / DIALYSIS CATHETERS
Indications
Introducer sheaths are available in a number of sizes for different applications, including insertion of pulmonary artery catheters and temporary pacing wires. In adults, 7.5 or 8.5 Fr are generally used. They may be used as large-bore access for volume resuscitation. Smaller sheaths may be used for introducing specialized monitoring such as jugular bulb oximetery. Large-bore double lumen dialysis catheters are used for haemodialysis, haemofiltration, plasma exchange and rapid transfusion.
Procedure
See Central venous cannulation above.


PULMONARY ARTERY CATHETERIZATION
The place of pulmonary artery catheters has been questioned recently and their use has diminished. In general non-invasive cardiac output monitoring and the ready availability of bedside echocardiography have superseded them. (See Haemodynamic monitoring, p. 74.) They may be of value, however, in conditions where haemodynamic instability or shock is unresponsive to fluid and inotrope therapy guided by conventional CVP measurement, particularly where pulmonary hypertension/right heart failure are thought to contribute to the problem. As insertion of a PA catheter is not without hazard, you should always seek senior guidance. Traditional indications and contraindications are shown in Box 15.3.
Box 15.3 Indications and contraindications for pulmonary artery catheterization
Indications | Relative contraindications |
---|---|
Shock | Severe coagulopathy |
Sepsis / SIRS | Unstable ventricular rhythm |
ARDS | Heart block |
Valvular heart disease* | Temporary transvenous pacemaker (wire dislodgement) |
Left ventricular failure | Stenosis tricuspid or pulmonary valve† |
Cor pulmonale / pulmonary hypertension | |
High-risk surgical patients |
† Severe stenosis or mechanical valves absolute contraindication.
Procedure
PA catheterization. You will need:
Universal precautions; sterile gown and gloves
5-mL syringe of local anaesthetic
Introducer sheath (see previous section)
Ultrasound/sterile probe cover and gel







COMMON PROBLEMS DURING PULMONARY ARTERY CATHETERIZATION
Catheter will not take the correct path
This may be due to a dilated RV or low CO. Do not persist if unsuccessful:
Catheter is ‘over wedged’
Catheter will not wedge


Complications
Potential complications of pulmonary artery catheterization are shown in Table 15.1.
TABLE 15.1 Complications of pulmonary artery catheterization
Complication | Comment |
---|---|
Central venous puncture | Any complications of central venous cannulation |
Dysrhythmia | Usually on passage through tricuspid valve and RV Especially if hypoxia, acidosis, hypokalaemia: withdraw catheter and reposition Complete heart block may occur |
Pulmonary infarction | Check catheter is in proximal PA on chest X-ray Never leave balloon inflated Display PA trace continuously |
Pulmonary artery rupture | Pulmonary haemorrhage and blood up the endotracheal tube Avoid overinflation of the balloon Watch trace and never inflate against resistance |
Infection | Risk includes endocardial damage and endocarditis Careful aseptic technique and catheter care Remove after 72 h or ASAP |
Knotting | Poor insertion technique Do not insert more than 20 cm without a change in trace Do not attempt to pull back. Call for help |
MEASUREMENT OF CARDIAC OUTPUT BY THERMODILUTION




Having measured the cardiac output and PA occlusion pressure a range of haemodynamic variables can be calculated. This is generally performed by the monitoring system. Normal values for these variables are given in Chapter 4. (See Optimizing haemodynamic status, p. 78.)
PERICARDIAL ASPIRATION
Procedure





DEFIBRILLATION AND DC CARDIOVERSION
Elective cardioversion is beyond the scope of this book. Life-threatening ‘shockable rhythm’ should be managed according to advanced life support protocols. (See pp. 90–98.) For cardioversion in the emergency situation, i.e. the intensive care patient with haemodynamic compromise, the following approach is reasonable.
Procedure
Pericardial aspiration. You will need:
Universal precautions; sterile gown and gloves
10-mL syringe of local anaesthetic and needle






If normal rhythm is not restored seek expert help. Consider:
INTUBATION OF THE TRACHEA
Indications
These fall broadly into three groups: relieving airway obstruction, protection of the airway from aspiration and facilitation of artificial ventilation of the lungs. Typical indications are given in Box 15.4.
Box 15.4 Indications for tracheal intubation
Airway obstruction | Risks of aspiration | Facilitation of IPPV |
---|---|---|
Tumours | Obtunded consciousness level | Anaesthesia and surgery |
Head and neck trauma | Bulbar palsy | Cardiopulmonary resuscitation |
Epiglottitis | Impaired cough reflexes | Respiratory failure |
Surgery | Cardiac failure | |
Airway oedema | Multisystem organ failure | |
Major trauma including chest injury | ||
Brain injury |
Muscle relaxants will usually be required to facilitate intubation. Suxamethonium (1–2 mg/kg) is rapid in onset and relatively short-acting in most patients. It is the drug of choice for rapid sequence induction. It has a number of side-effects, however, which limit its use. Atracurium (0.5 mg/kg) is an alternative, but is slower in onset and has a longer duration of action.
Procedure
Tracheal intubation. You will need:
Self-inflating bag (Ambu or similar) and oxygen supply
Two laryngoscopes (check bulbs)
Selection of endotracheal tubes
Syringe for cuff inflation and tape to tie tube
Gum-elastic bougie, airway exchange catheter or rigid stilette
Laryngeal mask (for use in failed intubation) sizes 3, 4, 5.









Complications
Potential complications of endotracheal intubation are shown in Box 15.5.
Immediate | Late |
---|---|
Hypoxia (prolonged attempts) | Accidental extubation or obstruction of airway |
Misplacement of tube | Complications associated with mechanical ventilation |
Obstruction of airway | Ventilator associated pneumonia |
Aspiration | Sinusitis |
Trauma to teeth | Injury to vocal cords |
Trauma to airway / larynx / trachea | Tracheal stenosis |
Nasal intubation may provoke epistaxis or predispose to mucosal injury (e.g. submucosal positioning of the tube). In the longer term, nasal intubation may occlude the maxillary antrum and give rise to sinusitis. It is nevertheless better tolerated than oral intubation, particularly during weaning from ventilation. Long-term complications include erosion and stenosis of local tissues, particularly of the larynx and trachea. This may present as airway obstruction and stridor after extubation (see p. 138).
EXTUBATION OF THE TRACHEA


INSERTION OF LARYNGEAL MASK (SUPRAGLOTTIC AIRWAYS)
PERCUTANEOUS TRACHEOSTOMY
Potential advantages of tracheostomy


Indications
Procedure
Percutaneous tracheostomy. You will need:
Universal precautions; sterile gown and gloves
Local anaesthetic (1% lidocaine (lignocaine) + adrenaline (epinephrine), syringe and needle
10 mL normal saline and syringe
Basic surgical instruments (e.g. venous cut down set)
Appropriate size cuffed tracheostomy tubes (1 size smaller and larger than planned)
Anaesthetist




Operator








COMMON PROBLEMS DURING PERCUTANEOUS TRACHEOSTOMY
Difficulty ventilating the patient
This usually means that the tracheostomy tube has been misplaced. Do not persist as this may produce a tension pneumothorax! Remove the tracheostomy tube and reintubate the patient by the oral route.
Complications
The potential complications of percutaneous tracheostomy are shown in Box 15.6.
Box 15.6 Complications of tracheostomy
Early | Late |
---|---|
Bleeding (may lead to total airway obstruction) | Tracheal stenosis |
Pneumothorax | Tracheo–oesophageal fistula |
Tube misplacement or dislodgement | Skin tethering / scarring |
Air emphysema | Late haemorrhage from innominate vessels |
Mucus plugging / obstruction | |
Stomal infection |
Changing tracheostomy tubes
Tracheostomy tubes can be changed at any time if necessary, but it is more difficult if the tract is not well established. Administer 100% oxygen and position as for performing a tracheostomy. Pass a large-bore suction catheter (with the end cut off) or gum elastic bougie through the old tracheostomy tube before removing it and use this as a guide to insert the new tube. Facilities for ventilating the patient with a bag and mask and for reintubation should be available in case of difficulty.
CRICOTHYROIDOTOMY/MINITRACHEOSTOMY
Minitracheostomy is a term used to describe the insertion of a similar small-bore non-cuffed tube through the cricothyroid membrane (4 mm internal diameter), principally to aid the clearance of secretions. The passage of suction catheters stimulates coughing and allows secretions to be aspirated. As a short-term measure these devices may help to prevent the need for naso-/orotracheal intubation and assisted ventilation. The small size of the tube limits its value and the use of minitracheostomy has declined in recent years.
Procedure
Cricothyroidotomy / minitracheostomy. You will need:
Universal precautions; sterile gown and gloves
Cricothyroidotomy / minitracheostomy kit (containing needle, guide wire, dilator tube and tape)

FIBREOPTIC BRONCHOSCOPY
Procedure






BRONCHOALVEOLAR LAVAGE
BAL using catheter


Having performed a BAL, telephone the laboratory and then send samples immediately with full diagnostic information and appropriate requests (Box 15.7).
INSERTION OF CHEST DRAIN
The emergency treatment of life-threatening tension pneumothorax is large-bore needle decompression. The diagnosis is made on clinical grounds without chest X-ray. (Hyper-resonance, reduced breath sounds, deviated trachea, haemodynamic compromise.) A 14-gauge cannula is inserted into the pleural cavity immediately above the second rib in the midclavicular line to allow air under tension in the pleural space to escape. This should always be followed by placement of a formal chest drain.
Site of drain
This is partly dictated by the position of the collection clinically and radiographically. In the case of long-standing collections, which may be loculated, ultrasound guidance may be helpful. In all other cases the drain should be sited in the 5th intercostal space, just anterior to the midaxillary line, and can be directed cephalad for air and caudally for fluid or blood. All drains should be placed immediately above the rib to avoid damage to the neurovascular bundle, which lies underneath.
Procedure
Chest drainage. You will need:
Universal precautions; sterile gown and gloves
10-mL syringe, local anaesthetic and needles (lidocaine (lignocaine) 1–2%)
Basic instruments: scalpel, blade, large arterial clamps
Insertion of drain through thoracostomy
COMMON PROBLEMS DURING INSERTION OF CHEST DRAINS
Persistent air leak
Indications for urgent thoracic surgical opinion
The combination of persistent air leak and non-compliant lungs (e.g. ARDS) may make adequate ventilation and gas exchange impossible. Urgent thoracic surgical opinion may be required (Box 15.8).
PASSING A NASOGASTRIC TUBE
Most patients in the ICU who require ventilation require a nasogastric tube, initially at least, to ensure gastric drainage and early enteral feeding (Box 15.9).
Box 15.9 Indications and contraindications for nasogastric tube
Indications | Contraindications |
---|---|
To deflate the stomach after bag mask ventilation | Base of skull fracture (use orogastric tube) |
To aspirate gastric contents which might otherwise reflux and soil the airway | Recent gastric or oesophageal surgery (discuss with surgeon) |
To provide a route for enteral feeding and drugs | Oesophageal varices (relative contraindication) |
Severe coagulopathy (consider oral route to avoid nose bleed) |
Procedure




PASSING A SENGSTAKEN–BLAKEMORE TUBE
A number of tubes have been designed to apply pressure to oesophageal varices in order to compress the vessels and reduce bleeding while the patient is resuscitated and definitive treatment carried out. The Sengstaken–Blakemore tube has three lumens. Two are used to inflate balloons, one in the stomach and the other in the oesophagus, while the third is used to aspirate gastric contents.
Procedure
Passing a Sengstaken–Blakemore tube. You will need:




PERITONEAL TAP/DRAINAGE OF ASCITES
Drainage of ascites: You will need:
Universal precautions; sterile gown and gloves
10-mL syringe, local anaesthetic lidocaine (lignocaine) 1–2% and needles

There is debate about how much fluid should be drained and what replacement fluid should be used. Seek local guidance.
TURNING A PATIENT PRONE



TRANSPORT OF CRITICALLY ILL PATIENTS


