AliveCor, Inc.
For support, please email
[email protected] or visit
www.alivecor.com 18 When a heart is in atrial fibrillation, its two upper chambers, the right and left atria,
essentially quiver instead of beating efficiently. This does not allow for complete emptying of
the atria and thus blood may become stagnant and create blood clots. This can lead to major
health problems, including strokes, transient ischemic attacks (TIAs), and pulmonary emboli
(PEs); depending which chamber of the heart has the blood clot in it.
Approximately 15 percent of strokes occur in people with atrial fibrillation. As age increases in
a population, so too does the incidence of atrial fibrillation, which peaks at about 3-5% in
people over the age of 65.
The most common presenting symptoms of atrial fibrillation are palpitations, dizziness, fast
pulse rate, irregularly irregular rhythm, an abnormal heart sound (S1), chest pain, chronic
shortness of breath, abnormal jugular venous pressure, fatigue, and impaired exercise
tolerance. Other symptoms related to TIAs and strokes may be the initial symptoms of atrial
fibrillation.
Some of the most common causes of atrial fibrillation are long-standing hypertension,
congestive heart disease, cardiac valvular lesions, myocardial infarctions, history of coronary
artery bypass grafts, hyperthyroidism, alcohol abuse, smoking, diabetes mellitus, and
electrolyte imbalances.
12.2. Possible AFib, Normal, Unreadable, and Unclassified Recordings in EKG review screen and
History
All EKG recordings analyzed as positive for atrial fibrillation, normal, or unreadable will have a
tag for future review. The Kardia phone app and Kardia watch app may display the
“Unclassified” message for an EKG recording that was not detected as Normal, nor as Possible
AFib, and not as Unreadable. Unclassified recordings may be normal rhythms, such as when
your heart rate is higher than 100 beats per minute after physicial activity, or abnormal
rhythms; if you consistently get “Unclassified” recordings, you may want to review these EKGs
with your physician or alternatively send these EKGs for Clinician Review from the Kardia app.
These tags will be visible in the History screen, Data Entry screen, and the EKG review screen.
12.3. Deactivation of the Unreadable Detector
The Unreadable detector can be turned on or off in the settings of the Kardia phone app
only.
12.4. Detector Usage
Kardia Mobile allows users to record EKGs as Lead II or Anterior Precordial Lead. The
detectors have been trained and tested on Lead I recordings only. Due to the difference in the
waveform from Lead II or Anterior Precordial Lead recordings, detector analysis messages
(e.g. “Normal”, “Unreadable”, etc.) of these recordings may be incorrect and you should not
use the results of the detector. Please consult your physician or perform a Clinical Review if
you wish to get an analysis of the recorded non-Lead-I EKG.