Cardiopulmonary Arrest

Pathophysiology of Cardiopulmonary Arrest (CPA)

  • Definition:

    • Cardiopulmonary arrest (CPA), also known as cardiac or circulatory arrest, is the cessation of heart and respiratory function that leads to death without suitable resuscitation.

    • Typically occurs in response to a primary cardiac event.

  • Common Causes:

    • The most common cause of CPA is ventricular fibrillation.

    • Other causes include:

    • Pulseless Electrical Activity (PEA)

    • Asystole

    • Patients stop breathing and become unresponsive during a cardiac arrest.

    • Death can occur within minutes without immediate interventions.

  • Nursing Knowledge:

    • A nurse must identify that the most prevalent cause of CPA in a clinical setting is ventricular fibrillation.

Epidemiological and Etiological Risk Factors

Etiology

  • Cardiac arrest is closely linked to underlying cardiac issues, primarily ischemia.

    • Ischemic heart disease is a significant cause of global mortality.

    • Other causes related to in-hospital cardiac arrests include:

    • Hypovolemia

    • Myocardial dysfunction

    • Septic shock

    • Additional cardiac conditions leading to CPA can comprise:

    • Heart failure

    • Cardiac tamponade

    • Valvular heart disease

    • Respiratory issues like pulmonary embolism or airway obstruction can also lead to cardiac arrest.

  • Sudden Cardiac Arrest (SCA):

    • Involves a sudden halt of cardiac activity resulting in death if resuscitation efforts fail.

    • Defined by unsuccessful attempts to restore viable heart rhythms.

  • Risk Factors for Sudden Cardiac Death:

    • Clients with higher baseline C-reactive protein levels.

    • Use of cocaine and the presence of genetic predispositions like chromosomal abnormalities.

    • Leading etiologies categorized include:

    • Heart disease

    • Arrhythmias

    • Sepsis

    • Trauma

Comorbidities

  • Over 70-75% of individuals who experience cardiac arrest have a history of coronary artery disease (CAD), which can include:

    • Atherosclerosis of coronary arteries

    • Presence of unstable lesions and ruptured atherosclerotic plaques

    • Thrombosis

    • Myocardial infarction

Epidemiology

  • SCA is a significant public health concern globally.

  • Incidence rates suggest that in the U.S., over 300,000 individuals per year will experience SCA.

    • Up to 90% of these individuals may die from it.

  • Data indicates higher incidence rates for out-of-hospital cardiac arrests (OHCA) compared to in-hospital cardiac arrests (IHCA); however:

    • Survival rates are generally higher for IHCA due to quicker treatment.

  • Studies show that healthcare organizations with teaching statuses and higher nurse staffing ratios have lower incidence rates of IHCA, demonstrating the impact of healthcare environment on outcomes.

Risk Factors for Sudden Cardiac Arrest (SCA)

Acquired Conditions

  • Age: Increased risk particularly after 40 years.

  • Gender: Males are at greater risk than females.

  • Ethnic Factors: Black Americans report higher SCA rates and worse outcomes compared to White or Latino Americans.

  • Additional risk factors include:

    • Diabetes mellitus

    • Tobacco use

    • Dyslipidemia

    • Obesity

    • Sedentary lifestyle

    • High fat diet with red meat

    • Hypertension

    • CAD

    • Inflammatory diseases such as rheumatoid arthritis

    • Obstructive sleep apnea

    • Chronic kidney disease

    • Substance abuse (cocaine, amphetamines)

    • Chronic stress and depression

Impact on Overall Health

  • The overall health impacts post-cardiac arrest are influenced by preexisting health conditions and the duration of the arrest.

    • Conditions such as sepsis, pneumonia, hypotension, and renal or hepatic dysfunction lead to poor survival rates.

    • Prolonged arrests can result in multiple organ injuries, notably affecting brain function.

    • Research indicates Black and Latino clients generally have poorer neurological outcomes compared to White clients.

Psychosocial Effects of Cardiac Arrest

  • Clients can experience post-cardiac arrest syndrome (PCAS), leading to psychosocial complications such as:

    • Depression

    • Anxiety, resulting in poor quality of life

    • Long-term effects like posttraumatic stress disorder (PTSD), cognitive issues, fatigue

Clinical Presentation of Cardiac Arrest

Manifestations

  • Loss of consciousness and absence of pulse and respiration are key indicators of cardiac arrest.

  • Symptoms before arrest may include:

    • Chest heaviness potentially radiating to the jaw, abdomen, or back

    • Tachypnea and diaphoresis

  • Out-of-hospital situations often present with ongoing CPR upon arrival at the emergency room.

    • Symptoms can evolve into dyspnea and total cessation of breathing.

    • Patients may experience lightheadedness, confusion, or loss of consciousness.

Warning Signs Preceding Cardiac Arrest

  • Dyspnea (more common in females)

  • Profound fatigue

  • Back pain

  • Flu-like symptoms

  • Abdominal pain, nausea, and vomitting

  • Chest pain (more common in males)

  • Lightheadedness, syncope, especially with exercise or changes in position

  • Palpitations or racing heartbeat

Laboratory Testing and Diagnostic Studies

  • To assess risk for perfusion alterations, lab tests such as:

    • Complete Blood Count (CBC)

    • Basic Metabolic Panel (BMP)

    • Arterial Blood Gas (ABG)

    • Cardiac biomarkers (cardiac enzymes)

Specific Lab Values

  • Cardiac Biomarkers:

    • CK (total): 20-200 U/L

    • CK-MB: 5-25 IU/L (indicates ischemia and myocardial damage)

    • Troponin levels indicate cardiac muscle injury as early as 2 hours post-incident:

    • Cardiac Troponin T: < 0.1 ng/mL

    • Cardiac Troponin I: < 0.03 ng/mL

Arterial Blood Gases

  • pH: 7.35 to 7.45

  • PCO2: 35 to 45 mm/Hg

  • HCO3: 21 to 28 mEq/L

  • PO2: 80 to 100 mm/Hg

  • O2 Saturation: 95 to 100%

  • Base Excess: 0 ± 2 mEq/L

Monitoring Cardiac Status

Additional Cardiac Biomarkers

  • Brain Natriuretic Peptide (BNP):

    • Elevated levels indicate heart failure; normal BNP is < 100 ng/L.

  • Lipid Panel Values:

    • LDL: < 130 mg/dL

    • VLDL: 7-32 mg/dL

    • Triglycerides:

    • Male: 40-160 mg/dL

    • Female: 35-135 mg/dL

    • HDL:

    • Male: > 45 mg/dL

    • Female: > 55 mg/dL

  • Prothrombin Time (PT): > 20 seconds; INR: 0.8–1.1

  • Partial Thromboplastin Time (PTT): 60–70 seconds; aPTT: 30–40 seconds

  • D-dimer: < 500 ng/mL (elevated levels indicate clotting)

  • Erythrocyte Sedimentation Rate (ESR):

    • Male: Up to 15 mm/hr

    • Female: Up to 20 mm/hr

    • Older Adult: Up to 40 mm/hr

Emergency Interventions During Cardiac Arrest

Priority Actions

  • CPR and defibrillation are priority interventions to enhance client outcomes in cardiac arrest.

Role of the Nurse

Environmental Factors

In the Community

  • Community cardiac arrests occur more than 350,000 times annually.

    • Rapid response is crucial, including notifying emergency services and starting CPR.

  • In 2021, CPR was performed by bystanders in 40.2% of cardiac arrest cases.

    • Nurses should advocate for CPR training and placement of Automated External Defibrillators (AEDs) in community settings to improve survival rates.

In the Hospital

  • Hospital cardiac arrests (often termed a code blue) involve an interprofessional response team.

    • Team may include nurses, respiratory therapists, phlebotomists, and physicians.

    • Nurses trained in Advanced Cardiac Life Support (ACLS) have responsibilities that include:

    • Interpreting dysrhythmias

    • Implementing necessary treatments

  • Roles of nurses in a hospitalization setting include:

    • Airway Manager: Responsible for intubation, oxygen delivery, and monitoring respiratory and ventilatory status.

    • First Responder: Assess the client for unresponsiveness, absence of pulse and respiration; initiate CPR immediately.

    • IV Nurse: Ensures patent IV access and administers IV medications during resuscitation.

    • Code Cart Nurse: Retrieves, prepares, and administers medications and supplies from the crash cart.

    • CPR Nurse: Administers chest compressions, alternating with other team members to maintain effectiveness.

    • Recorder: Documents all actions, rhythms, medications, and times for accurate records.

    • Team Lead Nurse: Interprets cardiac rhythm; directs CPR initiation and halting; coordinates medications and responses during situation.

Team Debriefing

  • Post-code debriefing is critical for team members to process the event and improve future responses.

  • 40% to 80% of clients in critical care settings expire during or shortly after cardiac arrest, creating additional psychological stress for healthcare professionals.

    • Opportunities for achieving emotional support and resilience should be sought by nurses.

Safety and Individual Considerations

  • Ensure safety during defibrillation by stating "all clear" before shocking the client.

In Critical Care Nursing

  • Requires specialized training in CPR, defibrillation, airway management, ACLS protocols and the use of algorithms for cardiac emergencies.

  • Steps of Survival in Cardiac Arrest:

  1. Activate emergency response system.

  2. Perform high-quality CPR.

  3. Defibrillation.

  4. Advanced resuscitation.

  5. Post-cardiac arrest care.

  6. Recovery.

Client Assessment and Nursing Process

  • Recognizing Cues:

    • Frequent assessments and monitoring vital signs are crucial, especially for clients at elevated risk.

    • Critical clinical problems include:

    • Unrelenting chest pain

    • Significant blood pressure deviations

    • abnormal heart rates

Managing Emergency Situations

  • Rapid assessments using cardiac monitors assist the nurse in diagnostic application and initiation of interventions via the ACLS algorithm.

Planning Interventions

  • Nurses must prepare for client needs, including family involvement and environmental considerations for effective emergency responses.

Post-Cardiac Arrest Care

Initial Stabilization

  • Treatments focus on airway management, hemodynamic stability, temperature regulation, and neurological assessment.

  • Targeted Temperature Management (TTM) is utilized to decrease metabolic rates and protect neurological function after CPA:

    • Induction Phase

    • Maintenance Phase

    • Rewarming Phase

Cooling Methods

  • Different cooling systems include:

    • Surface Cooling Systems (circulate cold fluid or air)

    • Intravascular Cooling Systems (infuse cold saline)

    • Conventional Cooling Techniques (utilizing ice packs and saline)

Pharmacology in Cardiac Arrest

Common Medications

  • Medications used routinely include:

    • Epinephrine: Increases heart rate and blood pressure.

    • Amiodarone: Class III antiarrhythmic.

    • Lidocaine: Class 1B antiarrhythmic for management of VF and VT.

    • Atropine: Increases heart rate.

    • Sodium bicarbonate: Used for acid-base balance adjustments.

    • Calcium and magnesium: Electrolyte management during cardiac arrest.

Hemodynamic Monitoring and IV Therapy

  • Continuous hemodynamic monitoring is facilitated through intra-arterial monitoring and CVP.

  • IV therapy is crucial for rapid fluid replacement during cardiac arrest.

    • Isotonic Crystalloid Fluids such as Lactated Ringer's and 0.9% Sodium Chloride are pivotal for plasma volume expansion.

Oxygen Therapy and Patient Monitoring

  • Immediate supplemental oxygen is vital following cardiac arrest to combat ischemia and hypoxia.

    • Maintaining oxygen saturation levels of 94% to 98% during resuscitation optimizes survival chances.

Conclusion

  • The nurse plays a vital role in the response to cardiac events, including assessment, intervention, coordination of care, and providing support to the patients and their families.

  • Continuous education and adherence to protocols are essential in improving outcomes following cardiac arrest.