U.S. doctors online nowAsk doctors free
Rockville, MD
A 42-year-old female asked:

What are the key differences between pots and ist?

1 doctor answer3 doctors weighed in
Dr. Robert Kwok
Pediatrics 34 years experience
Basic differences...: POTS: Abnormally fast sinus rhythm at rest or minimal activity that accelerates beyond expectations and is out of proportion to physiologic necessity, not resulting from an explainable underlying cause. Diagnosed by exclusion. IST: Condition of orthostatic intolerance leading to abnormal increase in heart rate with change in position. Diagnosed with tilt table.
Created for people with ongoing healthcare needs but benefits everyone.
Dr. Robert Kwok
Dr. Robert Kwok commented
Pediatrics 34 years experience
Provided original answer
Heart rate in POTS: Resting daytime heart rate exceeds 100 beats/min, and average heart rate on 24-h Holter monitor exceeds 90 beats/min. Heart rate in IST: Persistent increase in heart rate by more than 30 beats/min, or absolute pulse of more than 120 beats/min within 10 min of moving from a supine to upright position in the absence of orthostatic hypotension.
Jun 23, 2015

Related questions

A 19-year-old female asked:
What is pots?
3 doctor answers4 doctors weighed in
A 37-year-old female asked:
What are the symptoms of pots?
1 doctor answer1 doctor weighed in
A 36-year-old female asked:
What is pots? How is it treated?
1 doctor answer1 doctor weighed in
Last updated Jul 2, 2015
Connect with a U.S. board-certified doctor by text or video anytime, anywhere.
24/7 visits - just $39!
50% off with $15/month membership

Disclaimer:

Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.