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  1. Morphine Sulfate

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In this lesson, we'll go over the medication morphine sulfate and all of its effects, including indications, precautions and contraindications, and adult dosages. And at the end of the lesson, we take a look at respiratory distress.

Morphine sulfate is a mu-opioid receptor agonist effective in the relief of pain. It produces analgesia by binding to opioid receptors in the central nervous system.

Morphine Sulfate Indications

Morphine sulfate is indicated for chest pain which is refractory to the use of nitroglycerin.

Morphine Sulfate Precautions and Contraindications

Opioids are known to depress the respiratory system and may lower blood pressure. For this reason, consider using a reduced dose in older patients or in patients with an altered level of consciousness.

Adult Dosage of Morphine Sulfate

When administering morphine sulfate to adult patients, look to the following protocol:

  • Morphine may be given to patients in 2 to 4 mg increments via slow IV push.
  • Additional morphine given in doses of 2 to 10 mg may be given 5 to 15 minutes after the first dose, titrated to effect.
  • Be aware that gastrointestinal upset may occur in higher doses as well.

Pro Tip: Always titrate the dose of morphine to the patient's response and effects. If signs of hypotension, hypoventilation, bradycardia, or any other serious CNS depression symptoms appear, naloxone may be given at 0.04 to 2 mg IV to reverse the opioid side effects.

A Word About Respiratory Distress

As respiratory depression can occur with the use of morphine sulfate, we're going to dive a little deeper into the three types of respiratory issues: respiratory distress, respiratory failure, and respiratory arrest. In this Word, we'll first look at respiratory distress.

Normal Breathing

The average respiratory rate for an adult is about 12 to 20 ventilations per minute. Normal tidal volume of roughly 6 to 8 mL per kg will maintain normal oxygenation and the elimination of CO2.

Patients with normal breathing will have pink, warm and dry skin, appropriate breathing rate, visible chest rise and fall, and a pulse oximetry reading in the mid 90s to possibly even 100%. These patients will be able to talk in full sentences and will not have any abnormal noises or accessory muscles that are helping them breathe.

Abnormal Breathing

#1 Respiratory Distress

Respiratory distress is a clinical state characterized by an abnormal respiratory rate or effort. The effort may be increased (nasal flaring, retractions, accessory muscle use) or inadequate (hypoventilation, bradypnea). It can range from mild to severe, and severe distress may signal impending respiratory failure. In this state, the patient is still compensating, working harder to maintain adequate gas exchange despite airway obstruction, reduced lung compliance, or lung tissue disease.

Key signs and symptoms include:

  • Tachypnea and increased or inadequate respiratory effort
  • Abnormal airway sounds (stridor, wheezing, grunting)
  • Tachycardia
  • Pale, cool, or cyanotic skin, though some causes, such as sepsis, may instead cause warm, red, diaphoretic skin
  • Changes in level of consciousness or agitation

Treatment: Support the patient early, before compensation fails: allow a position of comfort, provide supplemental oxygen as needed, treat the underlying cause, and monitor closely for progression.

#2 Respiratory Failure

Respiratory failure is the point at which the patient can no longer maintain adequate oxygenation, ventilation, or both, meaning compensation has failed. It typically develops as severe respiratory distress worsens or the patient tires. This is a functional diagnosis: it can be recognized clinically and warrants immediate intervention without waiting for lab confirmation.

The most concerning signs are those showing the patient is losing the battle:

  • A decrease in respiratory effort as the patient tires (an ominous change from the increased effort of distress)
  • Inadequate air movement and diminished or absent airway sounds
  • Cyanosis that may not improve with supplemental oxygen
  • Tachycardia progressing to bradycardia
  • A deteriorating level of consciousness

Treatment: Intervene promptly and aggressively: open and maintain the airway, deliver high-concentration oxygen, and support ventilation (such as bag-mask ventilation) when the patient's own breathing is inadequate. Treat the underlying cause. Untreated, respiratory failure progresses rapidly to respiratory arrest.

#3 Respiratory Arrest

Respiratory arrest is the absence of effective breathing in a patient who still has a pulse. This is the key distinction: a patient in respiratory arrest has a pulse, whereas a patient in cardiac arrest does not.

Once effective breathing stops, oxygen saturation can fall to dangerous levels within seconds to a couple of minutes, and without correction, respiratory arrest will deteriorate into cardiac arrest.

Signs include:

  • Absent breathing, or agonal gasping only
  • A pulse that is still present (at least initially)
  • Cyanosis and unresponsiveness
  • Bradycardia progressing toward cardiac arrest

Treatment: The priority is immediate, effective ventilation: open the airway and deliver assisted ventilation with a bag-mask device plus supplemental oxygen. Oxygen saturation can be restored rapidly, preventing progression to cardiac arrest. Monitor the pulse closely, and if it is lost, transition immediately to CPR. If opioid overdose is suspected, naloxone may be given alongside, but never in place of, effective ventilation.