Pulmonary Embolism – An EMS Case Review

Ambulance 34, Ambulance 34. 452 Smithfield Street for the 34 year old male with chest pain and difficulty breathing. Delta-Level response. Medic 72 will be your backup. Time out 14:35

Ambulance 34, a BLS level ambulance responds from their designated system-status management post to the residential neighborhood where the call came from. Upon their arrival at the single-family home, they are directed into the kitchen through the garage by a woman who identifies herself as the patients wife. Once inside, they find the patient sitting upright in a kitchen chair holding his chest and grimacing in what appears to be pain. He doesnt look good.

My chest it like really hurts a lot the patient says. His words come slowly and deliberately. He doesnt look like hes able to take a full breath and his face twists up with pain after every inspiration. He seems very anxious.

I was mowing the grass And all of a sudden it just started hurting a lot. The patient stammers. He points to the left side of his sternum and coughs as he talks. I got dizzy and I am not really able to catch my breath I feel like Im going to pass out

The EMTs decide to keep the Medic unit coming and continue assessing the patient as they check his vitals. Through questioning the patient, they find out that he describes the chest pain as being Sharp like a knife and that it exacerbates, or worsens, to breathing in. They find that the pain is just to the left side of the sternum about the level of the nipple line. On their assessment, they find that the patients skin is pale, cool, and moist. His pupils are PERRL and he has no Jugular Venous Distension. His trachea is midline and mobile and both of his lungs are clear. His abdomen is soft and non-tender and he has good pulse, motor, sensation, and temperature in all 4 of his extremities. The EMTs did notice that the patients pulse was slightly irregular and elevated at 126 and that his blood pressure was elevated at 146/84. The patients oxygen saturation was 93% on room air. His only medication is a testosterone gel and he has no allergies.

Following their regional protocols, the EMTs apply a 4-lead EKG and obtain a 12-lead EKG. They transmit the EKG to the local cardiac hospital and print out a hard copy for the responding paramedics. They place the patient on 4-LPM oxygen via nasal cannula with ETCO2 sensing capability and see the patients pulse-ox improve to 98%. The ETCO2 waveform has regular morphology and shows a respiratory rate of 24 shallow breaths per minute.

As theyre finishing their assessment, the paramedics from Medic 72 arrive. The EMTs report their findings to them and prepare their cot for transport. The medic reviews the 12-lead and says that it looks good to her while her partner asks the patient a few more questions.

Have you recently been sitting more than normal? Have you travelled anywhere lately? What about any recent injuries? she asks.

Well, now that you mention it I just got a new job in the back office at work. Im sitting a lot more at a computer than I use to when I was on the floor. Also, I did sprain my knee at the gym the other day I started working out when I noticed the new computer job was putting a few new pounds on me the patient says. The oxygen seems to be helping him speak.

One of the paramedics rides in with the crew of Ambulance 34. Working from her diagnosis of a probable pulmonary embolism, she continues the oxygen and cardiac monitoring and establishes a saline lock in the patients right antecubital fossa. The medic administers 5mg of morphine to the patient to help control his severe pain and has the ambulance transport the patient to the cardiac hospital using the emergency lights and siren.

Once at the hospital, the physician orders a standard panel of labs which include a D-Dimer and a stat troponin level. He also orders a stat chest CT scan. The patient is diagnosed with a pulmonary embolism and started on anticoagulant therapy in the ED before admission to a monitored inpatient unit.

A sudden onset of sharp, pleuritic, chest pain and difficulty breathing can indicate PE.

A sudden onset of sharp, pleuritic, chest pain and difficulty breathing can indicate PE.

A pulmonary embolism, or a PE is not necessarily a disease in itself, but is a symptom of an underlying condition. It results from a blockage in the pulmonary artery or one of its larger branches that blocks some or all of the blood flow from the right ventricle of the heart to one or both lungs. The condition can cause anything from mild symptoms to sudden death but often presents with all or some of the signs and symptoms presented above. (1) This blockage can be caused by a number of things, such as a blood clot, a small piece of fat, amniotic fluid, or other problems.

Patients complaining of pulmonary embolism generally present with some or all of the following signs and symptoms: (2)

  • Usually a pulmonary embolism presents with a sudden onset of symptoms.
  • Chest pain Usually sharp and located on one side of the sternum. The pain generally exacerbates to inspiration. Patients sometimes describe the pain as a burning, an ache or a dull heaviness.
  • Tachypnea Rapid breathing which may be shallow due to the pain.
  • Tachycardia Rapid heart rate
  • Hypotension Low blood pressure
  • Sudden cough, possibly producing blood or bloody mucus – Hemoptysis
  • Shortness of breath
  • Wheezing
  • Anxiety
  • Cyanosis Bluish skin color
  • Pale, cool, and diaphoretic skin
  • Dizziness, lightheadedness, or fainting
  • Leg pain, redness, or swelling, symptoms of a deep vein thrombosis

Providers should also look out for atypical presentations of PE, which can result from a sudden lack of oxygenated blood flow to the body and can be such presentations as seizure, syncopal episode, or cardiac arrest.

Field EMS care for pulmonary embolism depends upon the presentation. For patients who present with an altered mental status, resuscitation up to and including CPR is indicated. Otherwise, care is supportive. Support oxygenation by maintaining SpO2 in the 97% and above range using as little oxygen is required for prevention of hypoxia. Hypotension should be treated with just enough fluid to restore blood flow, although it is wise to limit fluid to under 1 liter in order to avoid putting undue strain on the right ventricle. In cases of hypotension with suspected PE, vasopressors are indicated in hypotension refractory to fluid administration but may cause an undesirable increase in heart rate. (3) Pain management using narcotics such as Morphine and Fentanyl may reduce patient anxiety. Administration of nitroglycerine and aspirin have not been shown to be an effective treatment for PE (4) although many EMS protocols may call for their administration in medical protocols for chest pain of unknown origin.

Definitive treatment of PE is performed at a hospital through removal of the emboli from the pulmonary vasculature by various means, such as through anticoagulation therapy, thrombolytic therapy, or in some more rare cases, surgically. Inpatient admission is usually, but not always, required. Definitive diagnostic techniques include lab tests for D-Dimer levels, troponin levels, CT scan, and possibly transesophageal echocardiogram.

Since mortality caused by PE occurs often within minutes to hours after onset of symptoms, it is important for paramedics and EMTs to be able to consider PE as a potential diagnosis as it remains a condition that carries a high rate of morbidity and mortality. Be sure to consider PE as part of your differential diagnoses for patients complaining of chest pain, syncope, seizure, and cardiac arrest.

References:

  1. Pulmonary Embolism - Daniel R Ouellette, MD Medscape.com
  2. Pulmonary Embolus MedLine Plus Accessed 3/16/14
  3. Treatment of Acute Pulmonary Embolism Tapson V MD, www.Uptodate.com 8/12/13
  4. Pathophysiology and treatment of haemodynamic instability in acute pulmonary embolism: the pivotal role of pulmonary vasoconstriction – Yvo M. Smulders – Cardiovascular Research 48 (2000) 2333

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For more on differential diagnosis for chest pain, see: Call PAPPA for Chest Pain A Helpful Mnemonic for Paramedics and EMTs

  • John Albers

    I had a pulmonary embolism as a complication of a blood clot from a PICC line several years ago. Since I was already undergoing heavy chemotherapy the weakness, shortness of breath, dizziness, and other symptoms were overlooked for quite some time. It’s unclear how long I had it before we realized that the chemo effects should’ve lifted by now. Oddly enough, there was no pain of any kind, no swelling, no tachycardia, just weakness; as if whenever I stood up a giant invisible pair of hands grabbed my shoulders and began driving me toward the floor. It was dealt with successfully, thank goodness, but not before further complications in hospital which warrant another story in and of itself. They don’t always present with the classic criteria of symptoms. Scary things.

  • Heidi

    Great case study – thank you!

  • granny17

    12 lead will sometimes show S1Q3T3 pattern- S wave in lead 1, and Q wave and inverted T wave in lead III. Helpful if you see it, but absence of these findings does not rule out a PE.

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