Rib Fracture: Assessment and Pain Management

Assessment

Mechanism and Initial Exam

Significant rib fractures result from direct chest wall trauma: falls, blunt impacts, motor vehicle collisions, crush injuries. Severe coughing can fracture ribs in elderly patients with osteoporosis.

Visual inspection:

• Asymmetric chest rise (one side not expanding normally)
• Bruising or abrasion over the chest wall
• Paradoxical movement: a segment of chest wall moving inward on inhalation instead of outward (flail chest)

Palpation:

• Palpate systematically along each rib from sternum to posterior
• Point tenderness at a specific rib location suggests fracture
• Crepitus (grating or crackling sensation under the palpating finger) is highly specific for fracture — when present, there is a fracture
• Tenderness on compression: place hands on both sides of the chest and gently compress front-to-back; this stresses the ribs differently and produces pain at fracture sites

Auscultation:

• Listen to breath sounds bilaterally — equal breath sounds on both sides of the chest?
• Reduced or absent breath sounds on one side: pneumothorax or hemothorax until proven otherwise
• Diminished breath sounds at bases bilaterally: splinting from pain

Respiratory assessment:

• Respiratory rate: above 24/min is concerning
• Oxygen saturation if available (pulse oximeter)
• Use of accessory breathing muscles (neck muscles, intercostals pulling in)

Categorizing Injury Severity

Simple rib fracture (1-2 ribs, no complications):

• Manageable with analgesia and monitoring
• Goal: adequate pain control to allow normal breathing mechanics
• Monitor for pneumonia development over following days

Multiple rib fractures (3+):

• Significantly increased risk of pneumonia and pulmonary complications
• Higher analgesic requirements
• Stronger consideration for evacuation, especially in elderly or pulmonary-compromised patients

Flail chest (3+ adjacent ribs each broken in 2 places):

• Visible paradoxical movement — the segment moves in when the chest should be moving out
• Immediate evacuation — requires positive pressure ventilation in most cases
• Serious hemodynamic and respiratory compromise

Dangerous Complications

Pneumothorax

A fractured rib pierces the lung or chest wall, allowing air to enter the pleural space. Air in the pleural space prevents the lung from expanding normally.

Simple pneumothorax:

• Decreased breath sounds on affected side
• Chest pain worsening with inspiration
• Dyspnea
• Manage with monitoring; may resolve spontaneously if small

Tension pneumothorax (life-threatening emergency):

• Air enters the pleural space but cannot exit — pressure builds with each breath
• Rapidly progressive respiratory distress
• Tracheal deviation away from the affected side (late sign)
• Distended neck veins (late sign)
• Absent breath sounds on affected side
• Rapid deterioration to cardiovascular collapse and death

Needle decompression for tension pneumothorax: This is a potentially life-saving field intervention for suspected tension pneumothorax in a patient who is rapidly deteriorating:

• 14-gauge or largest available needle
• Insert into the 2nd intercostal space, midclavicular line (nipple level on the same side), just above the 3rd rib (to avoid the neurovascular bundle running under each rib)
• Insert until air rushes out (confirms diagnosis) or you reach maximum safe depth
• Leave the needle to release ongoing air
• Improvised: any large-bore needle or IV catheter
• This is a bridge — needle decompression does not definitively treat pneumothorax; it buys time for evacuation

Three-sided chest seal for open chest wound: If there is a penetrating wound to the chest that bubbles or makes sucking sounds with breathing (sucking chest wound):

• Apply an occlusive dressing (plastic wrapper, commercial chest seal) over the wound
• Tape three sides only — the open fourth side acts as a flutter valve, allowing air out but not in
• This prevents tension pneumothorax from developing while allowing drainage

Hemothorax

Blood in the pleural space from injured intercostal vessels or lung parenchyma.

Signs: Decreased breath sounds at base of one side, dullness to percussion at the base (blood settles), progressive dyspnea, possible signs of hemorrhagic shock if blood loss is significant.

Field management: Position with injured side down (blood pools away from functional lung). Evacuate — definitive management requires chest tube drainage.

Pain Management

Adequate analgesia is the primary treatment for rib fractures. Undertreated pain leads to splinting (not breathing deeply), which leads to secretion retention, which leads to pneumonia. Pneumonia after rib fractures is the leading cause of morbidity and mortality in this injury.

Step 1: NSAIDs Ibuprofen 600-800mg every 6-8 hours with food. Anti-inflammatory action reduces both pain and local swelling. Take on a scheduled basis (every 6-8 hours regardless of pain level) rather than only when pain breaks through — maintaining steady anti-inflammatory levels is more effective than peaks and troughs.

Step 2: Acetaminophen 500-1000mg every 4-6 hours, alternating with ibuprofen. Taking ibuprofen and acetaminophen together on an alternating schedule provides better analgesia than either alone for most people.

Step 3: Topical heat Warm (not hot) heat applied to the affected area reduces muscle spasm that compounds rib fracture pain. Heat pack or warm cloth for 15-20 minutes several times daily.

Step 4: Opioids if available For moderate to severe pain not controlled by the above: low-dose opioids reduce pain enough to allow normal respiratory mechanics. Tramadol 50-100mg every 6-8 hours, or codeine 30mg every 4-6 hours if available. The benefit of opioids for breathing mechanics must be weighed against their respiratory depression effect — opioids reduce the respiratory drive, which can be counterproductive if the patient is already breathing shallowly. Use the minimum effective dose.

Avoid:

• Rib wrapping (see above — causes atelectasis and pneumonia)
• Any medication causing sedation without also controlling pain (pure sedation impairs breathing without the analgesic benefit that protects respiratory function)

Respiratory Exercises

Incentive spirometry equivalent: If a commercial incentive spirometer is not available, have the patient breathe in through pursed lips as slowly and deeply as possible, then blow out slowly. The goal is maximum lung expansion 10 times per hour while awake. A balloon provides visual feedback — the patient tries to inflate it fully each hour (this is uncomfortable but therapeutic).

Supported cough: When coughing is necessary, hold a pillow firmly against the affected side. The counter-pressure during cough significantly reduces pain and allows more productive coughing.

Positioning: Semi-recumbent (head elevated 30-45 degrees) allows better diaphragmatic excursion than lying flat. Sleeping on the injured side may paradoxically be less painful than the uninjured side — many patients find this self-selecting. The most pain-free position that allows adequate ventilation is the correct position.

Monitoring for Pneumonia

Rib fracture-associated pneumonia typically develops 3-7 days after injury.

Monitor for:

• Increased respiratory rate
• Fever
• New productive cough
• Decreased breath sounds (localized, not from the original injury side)
• Worsening pain

If pneumonia develops: antibiotics (amoxicillin 500mg 3x/day or doxycycline 100mg 2x/day), increased analgesia to facilitate coughing, and positioning to encourage drainage of the affected lobe.