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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. Sinus arrhythmia
FLUN(H1N1)×Sinus arrhythmia

Sinus arrhythmia Reports for FLUN(H1N1)

#211 most reported symptom for this vaccine

10
Reports
0
Deaths
10
Hospitalizations
0
Mortality Rate
%
100
Hosp. Rate
%

Sinus arrhythmia and FLUN(H1N1)

Sinus arrhythmia has been reported 10 times in association with FLUN(H1N1) vaccination in VAERS.

Among these reports, 0 mentioned death (0.00%) and 10 involved hospitalization (100.0%).

Sinus arrhythmia is the #211 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 10 reports of Sinus arrhythmia after FLUN(H1N1) vaccination may seem alarming, but context is critical.

The mortality rate among these reports is very low at 0.00%, suggesting most cases are non-fatal.

Important Context

•Association, not causation: These reports show Sinus arrhythmia occurred after vaccination, not that the vaccine caused it.
•Background rates: Sinus arrhythmia 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

Gallop rhythm present10 reportsPituitary tumour benign10 reportsSinus bradycardia10 reportsMood altered10 reports

Quick Facts

Reports:10
Deaths:0
Hospitalizations:10
% of Vaccine:—%
Rank:#211 of 573

Related Pages

FLUN(H1N1) OverviewSinus arrhythmia (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.