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Data source: VAERS (Vaccine Adverse Event Reporting System)

Data through 2026 · Updated quarterly

Built by TheDataProject.ai · © 2026 VaccineWatch

Important: VAERS accepts reports of adverse events following vaccination. For any given report, there is no certainty that the reported event was caused by the vaccine. Reports may contain information that is incomplete, inaccurate, coincidental, or unverifiable. Most reports to VAERS are voluntary, which means they are subject to biases. This data cannot be used to determine if vaccines cause or contribute to adverse events.

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Important: VAERS reports alone cannot determine if a vaccine caused an adverse event. Reports may contain incomplete, inaccurate, or unverified information. Correlation does not equal causation.

  1. Home
  2. Vaccines
  3. FLUN(H1N1)
  4. Cardiac arrest
FLUN(H1N1)×Cardiac arrest

Cardiac arrest Reports for FLUN(H1N1)

#354 most reported symptom for this vaccine

5
Reports
1
Deaths
3
Hospitalizations
20
Mortality Rate
%
60
Hosp. Rate
%

Cardiac arrest and FLUN(H1N1)

Cardiac arrest has been reported 5 times in association with FLUN(H1N1) vaccination in VAERS.

Among these reports, 1 mentioned death (20.00%) and 3 involved hospitalization (60.0%).

Cardiac arrest is the #354 most frequently reported symptom for FLUN(H1N1) out of 573 total symptoms.

Disclaimer: VAERS reports describe events that occurred after vaccination but do not establish that the vaccine caused the event. Many reported symptoms may be coincidental or related to underlying conditions.

What This Means

Seeing 5 reports of Cardiac arrest after FLUN(H1N1) vaccination may seem alarming, but context is critical.

The 20.00% mortality rate among these reports is elevated, but this reflects the severity of the condition itself rather than vaccine causation.

Important Context

•Association, not causation: These reports show Cardiac arrest occurred after vaccination, not that the vaccine caused it.
•Background rates: Cardiac arrest may occur naturally at baseline rates in the population, unrelated to vaccination.
•Anyone can report: VAERS accepts reports from anyone — patients, parents, healthcare providers — without requiring medical verification.
•Denominator missing: VAERS counts reports, not rates per dose. Without knowing how many doses were given, raw counts can be misleading. Learn more →

Similarly Ranked Symptoms

Dyspepsia5 reportsEpstein-Barr virus test negative5 reportsDecreased activity5 reportsNight sweats5 reports

Quick Facts

Reports:5
Deaths:1
Hospitalizations:3
% of Vaccine:—%
Rank:#354 of 573

Related Pages

FLUN(H1N1) OverviewCardiac arrest (All Vaccines)Why Raw Numbers MisleadTop Symptoms Analysis

Data Source

This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.