Needle Decompression & Finger Thoracostomy

Needle decompression converts suspected tension pneumothorax into a temporary air exit. Do it as soon as tension physiology is recognized; the site and catheter length below are the protocol values to check.

Needle decompression is a pleural puncture done in an emergency. Its job is to let trapped air out. Finger thoracostomy does the same job by opening the chest with blunt dissection instead of a needle. You reach for it when the needle fails or when a chest tube is not possible yet.

How It Works

• Air trapped under pressure: air gets into the pleural space and has no way out. Pressure climbs, and the lung collapses.
• Mediastinal shift: the pressure pushes the heart and great vessels to the other side. Venous return drops.
• Decompression: a catheter through the chest wall lets the air out to atmosphere. Pressure falls, and venous return comes back.
• Temporary effect: the catheter can kink, clot or fall out. Air can build back up. That is why a chest tube must follow.

Where It Fits

Tension pneumothorax is a clinical diagnosis. Suspect it in a patient with hypotension, hypoxemia or cardiac arrest? Decompress before imaging. Don't wait for a film. The needle is the first step. If needle attempts fail, TCCC allows finger thoracostomy or chest tube only in refractory shock, and only for trained providers. Civilian protocols may use finger thoracostomy sooner. Tube thoracostomy is the definitive step. In traumatic cardiac arrest with torso trauma, TCCC directs needle decompression on both sides of the chest (see Indications).

Indications

• Suspected tension pneumothorax: one-sided absent or reduced breath sounds with hypotension, hypoxemia or obstructed ventilation
• Ventilated patient: rising airway pressures, falling SpO₂ or BP, and a one-sided exam. Decompress without delay. Check auto-PEEP or circuit problems only as a quick differential.
• Traumatic cardiac arrest with torso trauma: TCCC (combat guidance) directs needle decompression on both sides of the chest before the patient reaches a treatment facility. Civilian and ventilated-patient protocols may use finger or simple thoracostomy instead. Follow local protocol.

Absolute Contraindications

None, once tension physiology is clinically present. Don't delay decompression for imaging, for vital signs that look stable, or for a second provider to agree.

Relative Contraindications & Cautions

• No tension signs: a pneumothorax without hypotension, hypoxemia or rising pressures gets monitoring and a chest tube per protocol. It does not get a needle.
• Blood on needle withdrawal: possible hemothorax or vessel injury. Plan a chest tube.
• Unclear site landmarks: re-palpate, or move to the other site. Don't insert through an unknown plane.

Consider an Alternative

Reach for finger thoracostomy when a needle has failed or the catheter is too short for the chest wall. Tube thoracostomy comes once the patient is stable enough to move and the team has a drainage kit.

Team Roles During the Procedure

• Operator: confirms the side and site, decompresses and secures the catheter
• Airway/oxygen manager: keeps the ventilation and oxygen running and reports pressure changes
• Monitor/recorder: reads BP, SpO₂ and time, and calls each change
• Equipment support: hands over the needle, the second site option and the chest-tube kit in order

Recognition, Including Ventilated Patients

TCCC accepts two sites. One is the anterior 2nd intercostal space at the midclavicular line. The other is the lateral 4th or 5th intercostal space at the anterior axillary line. Both are used in practice. Observational data favor different sites for different body habitus.

2nd ICS, Midclavicular (Anterior)

1. Find the second rib: follow the rib from the sternal angle, then count to the second intercostal space
2. Mark the midclavicular line: from the midpoint of the clavicle, straight down
3. Insert over the top of the third rib: perpendicular, staying above the rib
4. Advance: to the hub of the chosen catheter, per protocol; hold 5–10 seconds, then remove the needle and leave the catheter

Pediatric

For children, the protocol sets the site and depth. See Special Populations.

4th/5th ICS, Anterior Axillary (Lateral)

1. Abduct the arm if possible: this opens the lateral chest wall
2. Find the nipple level: locate the 4th or 5th intercostal space at the anterior axillary line
3. Insert over the top of the rib: perpendicular, not angled toward the heart
4. Advance only until air is released or a give is felt, then stop: TCCC says to the hub, yet the 2023 CT study found the heart within reach of a full 83 mm unit here. Don't hub the full unit at this site unless the service protocol says otherwise. Hold 5–10 seconds, then remove the needle.

Pediatric

Follow the local pediatric protocol. A smaller child may need a shorter catheter or a different site.

Equipment

Sizing

Patient Positioning & Preparation

Bare the chest, and name the side from breath sounds and the exam. Lay the patient flat or semi-recumbent. On a lateral site, keep the arm out and up if the patient allows. Oxygen keeps running. A ventilated patient stays on the circuit unless pressure is climbing.

Phase 1: Prepare

1. Call tension early: state the suspected side and the reason, and assign the team roles
2. Choose the site: the 2nd ICS MCL or the 4th/5th ICS AAL, per protocol and the patient's habitus

Phase 2: Perform

3. Clean the site: disinfect the skin over the chosen space
4. Palpate and mark: confirm the rib, then the space below it
5. Insert perpendicular: over the top of the rib, at 90 degrees to the chest wall
6. Advance: to the hub at the 2nd ICS MCL, per protocol; at the 5th ICS AAL advance only until air is released or a give is felt (see Anatomy)
7. Hold and withdraw: hold 5–10 seconds, remove the needle, and leave the catheter
8. Secure and listen: tape the hub and listen for air release

Phase 3: Confirm & Secure

9. Reassess: BP, SpO₂, breath sounds, and ventilation pressures within a minute
10. Plan the next step: if no response after two needle decompressions, move to the Circulation step (TCCC); finger thoracostomy or chest tube only per protocol and in refractory shock

Alternative Technique: Finger Thoracostomy

You reach for it when a needle has failed or tension comes back. Under TCCC guidance, that means after two needle attempts, in refractory shock, by a trained and authorized provider. It is usually done on intubated, positive-pressure ventilated patients. Open the chest in a spontaneously breathing patient and you can create an open pneumothorax, so have a plan for an immediate tube or a seal. The sources behind this page describe the technique only in limited detail. Follow the protocol and your training.

1. Mark the site: the safe triangle at the 5th intercostal space, anterior to the mid-axillary line and lateral to the pectoralis major edge, above the rib. Analgesia first if the patient is awake
2. Incise: make a skin incision of about 3–4 cm, per protocol, and divide to the intercostal muscles over the top of the rib
3. Blunt dissection: open the pleura with a curved forceps or finger, stay above the rib
4. Sweep and confirm: insert a gloved finger into the space and sweep it to confirm lung freedom and check for adhesions; confirm by air rush, then keep the track open. Do not use a trocar

Primary Confirmation

Look for a physiologic response. BP and SpO₂ come up, ventilation pressure comes down, and breath sounds return on the treated side. A brief hiss is not enough on its own.

Secondary Confirmation

• Breath sounds equal bilaterally on re-exam
• Waveform EtCO₂ rising or stable in a ventilated patient
• Chest rise on the treated side in a ventilated patient
• Catheter hub stays secure and does not kink

Ongoing Monitoring

• BP, SpO₂ and breath sounds every 5 minutes until transfer (local suggestion; not a TCCC figure)
• Ventilator pressures continuously in a ventilated patient
• Catheter position and dressing at every move
• Relapse after an initial response: re-decompress at once, then chest tube

Pediatrics

• Catheter length: set it from the child's chest wall, using ultrasound or CT data where available. Don't use an adult default. An 8 cm adult catheter may overshoot in a small child.
• Site: the protocol sets the site and size for children. The sites above are adult values.
• Obstructive shock: needle decompression comes first, then a chest tube per protocol. In an unstable child, don't wait for a chest X-ray.
• Site and size: the same two sites are described for adults. This page gives no validated pediatric catheter length or gauge. Use the local pediatric protocol.

For pediatric sizes and doses, go to equipment sizing, pediatric shock, or pediatric cardiac arrest.

Obesity

• Chest wall: in overweight and obese adults, it is thicker at the lateral site than at the 2nd ICS MCL.
• Catheter: you may need a longer one. The MCL site may be the better choice.

Physiologically Difficult

• Shock: decompress without delay. The team runs its other steps alongside.
• Ventilated patient: a one-sided exam with falling BP or SpO₂ means decompress without delay. Disconnect and hand-bag only as a quick differential for auto-PEEP or circuit problems. That check must never delay decompression when tension is evident.

Immediate Aftercare

• Reassess: BP, SpO₂, breath sounds and ventilation pressures after every change
• Secure: tape the catheter and mark the site
• Plan drainage: chest tube per protocol as soon as possible, ideally before flight when feasible

Ongoing Maintenance

• Check the catheter hub and dressing at every move
• Watch for relapse, falling SpO₂ and rising pressures
• Re-decompress at once if the patient deteriorates

Transport Considerations

• Relapse: a catheter can kink or fall out during loading and moving
• Altitude: air expands on ascent (Boyle's law), so reassess before and during flight and at each altitude change; a decompressed pneumothorax may re-enlarge or tension may recur in flight. Prefer a chest tube before flight when feasible.
• Noise and vibration: rely on monitors and breath sounds, not on the sound of air
• Reassessment: after each move and every change in ventilator settings

Pearls

• Decide early: tension is a bedside call. Don't wait for imaging.
• Length matters: one retrospective single-centre study found an 8 cm catheter more effective than the older 5 cm length. The TCCC unit is 83 mm.
• Two attempts: for failure to respond, TCCC caps needle decompressions at two, then moves you to Circulation. A recurrence after a response is a new event.
• Hold and remove: hold 5–10 seconds. Then the needle comes out, and the catheter stays.
• Needle is temporary: a chest tube has to follow.

Common Pitfalls

• Waiting for certainty: you don't need a perfect picture first. Decompress once tension physiology is present, then confirm.
• Judging by a hiss: a hiss is not proof. Confirm with BP, SpO₂ and pressures.
• Pushing past the planned depth: at the lateral site, don't hub the full unit. Never angle the needle toward the heart.
• Sealing an open wound: a sealed open wound can turn into tension under the seal. If tension develops under any seal, burp or lift the seal, then decompress if signs persist (TCCC text as found, verify current wording). The case for vented seals rests on a model study. That study compared three vented seals with each other, not vented with unvented. It is limited evidence.

Skill Maintenance

• Practice landmarks at both sites on a chest model at least every 6 months
• Run tension simulations in the ventilated patient, not only in the trauma bay
• Check decompression kits for catheter length and gauge at every shift
• Debrief each case: was tension recognized early enough, and was the site right