Medical Emergency Protocols

6.4 Medical Emergency Protocols

Prevention and Management of Common Dental Office Emergencies

Medical emergencies can arise rapidly in the dental setting, often triggered by stress, anxiety, or pain. Clinicians must recognize clinical signs immediately and implement standard treatment protocols.

Syncope (Vasovagal Syncope)

Syncope is a transient loss of consciousness caused by temporary cerebral hypoxia. It is the most common medical emergency in the dental office, often triggered by fear of injections.

• Clinical Presentation: Pallor, cold sweat (diaphoresis), lightheadedness, nausea, bradycardia, and hypotension, followed by a loss of consciousness.
• Protocol:
  1. Immediately place the patient in the Trendelenburg position (head lower than the heart and heels) or supine to promote blood flow back to the brain.
  2. Maintain an open airway and monitor vital signs (pulse, respiration, blood pressure).
  3. Administer supplemental oxygen (high-flow).
  4. Crush a capsule of ammonia inhalant and pass it briefly under the patient's nose. This noxious stimulus triggers reflex stimulation of the respiratory center.
  5. Apply a cool, damp cloth to the patient's forehead. Once conscious, keep the patient supine until fully recovered.

Hyperventilation

Hyperventilation is rapid, shallow breathing driven by anxiety, leading to excessive elimination of carbon dioxide (CO2). This results in respiratory alkalosis and hypocalcemia.

• Clinical Presentation: Tachypnea (rapid breathing), chest tightness, lightheadedness, tingling in the fingers and around the mouth (paresthesia), and carpopedal spasms (cramping/stiffening of the hands and fingers).
• Protocol:
  1. Place the patient in an upright position to facilitate comfortable chest expansion.
  2. Calm and reassure the patient, instructing them to slow their breathing rate (inhale, hold for a few seconds, then exhale slowly).
  3. Have the patient cup their hands over their nose and mouth (or breathe into a small paper bag) to rebreathe their exhaled CO2, which restores normal blood pH.
  4. Do NOT administer oxygen, as this will worsen the respiratory alkalosis and prolong the emergency.

Asthma Attack (Bronchospasm)

An asthma attack is a reversible airway obstruction caused by bronchial hyper-responsiveness to stress, allergens, or anxiety.

• Clinical Presentation: Expiratory wheezing, dyspnea (shortness of breath), coughing, chest tightness, cyanosis, and the use of accessory muscles to breathe.
• Protocol:
  1. Position the patient in a comfortable upright position.
  2. Administer the patient's personal bronchodilator (albuterol, a beta-2 agonist; 2 puffs).
  3. Administer supplemental oxygen.
  4. If the patient does not respond or condition deteriorates, administer intramuscular epinephrine (0.3 mg of 1:1,000 for adults; 0.15 mg for children) and call 911 immediately.

Anaphylaxis

Anaphylaxis is a severe, life-threatening, immediate systemic allergic reaction (Type I hypersensitivity) causing bronchial constriction and severe vasodilation.

• Clinical Presentation: Rapid-onset urticaria (hives), pruritus (itching), angioedema (facial, lip, tongue, and airway swelling), wheezing, stridor, hypotension, and cardiovascular collapse.
• Protocol:
  1. Call 911 immediately.
  2. Administer epinephrine 1:1,000 (0.3 mg IM for adults; 0.15 mg IM for children) into the anterolateral aspect of the thigh (vastus lateralis muscle). Epinephrine is the primary drug because it causes vasoconstriction (to raise BP) and bronchodilation.
  3. Place the patient in a supine position with legs elevated (unless severe breathing difficulties require an upright posture).
  4. Administer oxygen and monitor vitals. Prepare to administer CPR if the patient loses consciousness and cardiac arrest occurs.

Hypoglycemia (Insulin Shock)

Hypoglycemia occurs when blood glucose levels drop below normal (typically < 70 mg/dL). It is common in diabetic patients who took their insulin or oral medication but failed to eat prior to their dental appointment.

• Clinical Presentation: Cold sweat, tremors, tachycardia, confusion, irritability, headache, hunger, progressing to seizures, loss of consciousness, and insulin shock.
• Protocol:
  • If the patient is conscious: Administer oral carbohydrates (orange juice, soda, glucose gel, frosting, or candy). Monitor blood glucose and wait for symptoms to resolve.
  • If the patient is unconscious: Call 911 immediately. Do NOT administer oral liquids due to the high risk of aspiration. Place the patient in a supine position, maintain the airway, administer oxygen, and administer intramuscular glucagon (1 mg) or IV dextrose if qualified.

Chest Pain: Angina Pectoris vs. Myocardial Infarction (MI)

• Angina Pectoris: Transient myocardial ischemia due to temporary coronary artery constriction. Pain is typically relieved by rest and nitroglycerin.
• Myocardial Infarction (MI): Irreversible necrosis of cardiac muscle tissue due to complete coronary artery occlusion. Pain is crushing, radiates, and is not relieved by nitroglycerin.
• Protocol:
  1. Position the patient comfortably, usually upright.
  2. Administer nitroglycerin (0.4 mg sublingually). You may repeat the dose every 5 minutes, up to a maximum of 3 doses. Nitroglycerin is a vasodilator that reduces preload and dilates coronary arteries.
  3. Administer supplemental oxygen.
  4. If the pain is not relieved after the first dose, or if the patient has no prior history of angina: Call 911 immediately.
  5. If MI is suspected, have the patient chew an adult aspirin (162 to 325 mg) to inhibit platelet aggregation and reduce thrombus size.

Choking and Airway Obstruction

Airway obstruction occurs when a foreign body (e.g., dental crown, cotton roll, bracket) falls into the pharynx.

• Partial Obstruction (good air exchange): Patient is coughing forcefully and can speak. Protocol: Encourage coughing; do not interfere.
• Complete Obstruction (poor/no air exchange): Patient cannot speak, cough, or breathe, and may clutch their throat (universal sign of choking).
• Protocol:
  • If conscious: Perform abdominal thrusts (Heimlich maneuver) until the object is dislodged.
  • If the patient becomes unconscious: Call 911. Place the patient supine and begin CPR (starting with chest compressions). Each time the airway is opened for breaths, look in the back of the mouth for the object. Remove it only if it is visible. Do NOT perform blind finger sweeps, which can push the object deeper.