Vaccination Recommendations Before Splenic Artery Embolization

Introduction to Vaccination Guidelines

The American College of Cardiology recommends that patients undergoing splenic artery embolization who lose ≥50% of splenic mass should receive the same vaccination protocol as splenectomy patients, including pneumococcal, meningococcal, Haemophilus influenzae type b, and annual influenza vaccines 1, 2

Clinical judgment should prevail if there is concern about splenic function, even if the patient has less than 50% embolization 3

For planned/elective procedures, administer all vaccines at least 2 weeks before embolization to ensure optimal antibody response, with a preferred timeframe of 4-6 weeks if possible 1, 2
For emergency/trauma cases, wait at least 14 days post-procedure before vaccinating, as antibody response is suboptimal before this timeframe 1, 2
Antibody formation generally takes 9 days, making the 2-week minimum critical 3

The Centers for Disease Control and Prevention recommends PCV20 as the initial pneumococcal vaccine, followed by PPSV23 at least 8 weeks later if using PCV15 1, 2
Revaccination with PPSV23 is recommended every 5 years for life 1, 2
For meningococcal vaccination, administer 2 doses of MenACWY 8 weeks apart, and 2-3 doses of MenB depending on formulation 1, 2
Revaccination with MenACWY is recommended every 5 years for life, and MenB every 2-3 years if risk remains 1, 2
The risk of meningococcal infection carries 40-70% mortality in asplenic patients, making this vaccination essential 3
For Haemophilus influenzae type b vaccination, a single dose is recommended for previously unvaccinated adults 1, 2
Annual inactivated or recombinant influenza vaccine is recommended for life, as it reduces secondary bacterial pneumonia and sepsis risk by 54% 1, 3, 4

Failing to vaccinate patients with ≥50% embolization is a common error, with research showing only 8% of splenic embolization patients receive appropriate immunizations 1, 2
Forgetting lifelong revaccination schedules, including PPSV23 every 5 years, MenACWY every 5 years, MenB every 2-3 years, and annual influenza vaccine 1, 2, 4

Lifelong antibiotic prophylaxis with phenoxymethylpenicillin is recommended, especially in the first 2 years 1, 2
Emergency standby antibiotics, such as amoxicillin, should be kept at home for immediate use with fever >101°F (38°C) 1, 2
Medical alert identification and formal notification to primary care providers of asplenic status are crucial 2, 4
Special precautions for dog bites, including a 5-day course of co-amoxiclav, are necessary due to Capnocytophaga canimorsus susceptibility 1, 4

Overwhelming post-splenectomy infection carries 30-70% mortality, with most deaths occurring within 24 hours 1, 2, 4
The risk is lifelong, with cases reported more than 20 years post-procedure, and Streptococcus pneumoniae accounts for approximately 50% of OPSI cases 1, 2