Tag Archives: Apple Heart Study

My Top Four Practice-Changing Presentations From the ACC 2019 Meeting: From Alcohol To Aspirin

The ACC meetings in New Orleans have wrapped up and I must stop letting the good times roll.

In the areas I paid attention to I found these four presentations the most important:

1. After the historic back to back presentations of the Partner 3 and Evolut trials it is clear that catheter-based aortic valve replacement (TAVR) should be the preferred approach to most patients with severe symptomatic aortic stenosis.

Both TAVR valves (the baloon-expanded Edwards and the self-expanding Medtronic) proved superior to surgical AVR in terms of one year clinical outcomes.

2. The Alcohol-AF Trial. It is well known that binge alcohol consumption (holiday heart) can trigger atrial fibrillation (AF) and that observational studies show a higher incident of AF with higher amounts of alcohol consumption.

This trial was the first ever randomized controlled trial of alcohol abstinence in moderate drinkers with paroxysmal AF (minimum 2 episodes in the last 6 months) or persistent AF requiring cardioversion.

Participants consumed >/= 10 standard drinks per week and were randomized to abstinence or usual consumption.

They underwent comprehensive rhythm monitoring with implantable loop recorders or existing pacemakers and twice daily AliveCor monitoring for 6 months.

Abstinence prolonged AF-free survival by 37% (118 vs 86 days) and lowered the AF burden from 8.2% to 5.6%

AF related hospitalizations occurred in 9% of abstinence patients versus 20% of controls

Those in the abstinence arm also experienced improved symptom severity, weight loss and BP control.

This trial gives me precise numbers to present to my AF patients to show them how important eliminating alcohol consumption is if they want to have less AF episodes.

It further emphasizes the point that lifestyle changes (including weight loss, exercise and stress-reduction) can dramatically reduce the incidence of atrial fibrillation.

3. AUGUSTUS. This trial looked at two hugely important questions in patients who have both AF and recent acute coronary syndrome or PCI/stent. The trial was simultaneously published in the New England Journal of Medicine. The questions were:

Apixaban (Eliquis, one of the four newer oral anticoagulants (NOAC)) versus warfarin for patients with AF: which is safer for prevention of stroke related to AF?

Triple therapy with  low dose aspirin and clopidogrel plus warfarin/NOAC versus clopidogrel plus warfarin/NOAC: which is safer in preventing stent thrombosis without causing excess bleeding in patients with AF and recent stent?

Briefly, they found:

The NOAC apixaban patients compared to warfarin had a 31% reduction in bleeding and hospitalization. No difference in ischemic events.

Adding aspirin  increased bleeding by 89%. There was no difference in  ischemic events. (Major or clinically relevant nonmajor bleeding was noted in 10.5% of the patients receiving apixaban, as compared with 14.7% of those receiving a vitamin K antagonist (hazard ratio, 0.69; 95% confidence interval [CI], 0.58 to 0.81; P<0.001 for both noninferiority and superiority), and in 16.1% of the patients receiving aspirin, as compared with 9.0% of those receiving placebo (hazard ratio, 1.89; 95% CI, 1.59 to 2.24; P<0.001).)

This means that the dreaded “triple therapy”  after PCI in patients with AF with its huge bleeding risks no longer is needed.

It also further emphasizes that NOACs should be preferred over warfarin in most patients with AF.

The combination of choice now should be a NOAC like apixaban plus clopidogrel.

4. REDUCE-IT provided further evidence that icosapent ethyl (Vascepa) significantly reduces major cardiovascular events in patients with establshed CV disease on maximally tolerated statin therapy.

The results of the pirmary end point from the REDUCE-IT were presented at the AHA meeting last year and they were very persuasive. At the ACC, Deepak Bhatt presented data on reduction of total ischemic events from the study and they were equally impressive. Adding the pharmaceutical grade esterified form of EPA at 2 grams BID reduced first, second, third and fourth ischemic events in this high risk population.

The benefit was noted on all terciles of baseline triglyceride levels. Thus, the lowest tercile of 81 to 190 mg/dl benefitted as well as the highest tercile (250 to 1401).

Although I dread the costs, it’s time to start discussing adding Vascepa on to statin therapy in high risk ASCVD patients who have trigs>100 .

As I wrote previously I didn’t learn anything from the much ballyhooed and highly anticipated Apple Heart Study . It’s entirely possible more participants were harmed than helped by this study.

Philomathically Yours,

-ACP

Apple Heart Study: Despite The Ballyhoo, No Benefits Demonstrated, Harms Not Measured

The results of the Apple Heart Study, were presented this morning at the American College of Cardiology Scientific Sessions amid intense media scrutiny. The AHS is a “prospective, single arm pragmatic study” which had the primary objective of measuring the proportion of participants with an irregular pulse detected by the Apple Watch who turn out to have atrial fibrillation on subsequent ambulatory ECG patch monitoring.

 

I and over 400,000 other Apple Watch owners participated in the AH study by downloading the Apple Heart Study app and self-verifying our eligibility. 

My assessment is that we have learned little to nothing from the AHS that we didn’t already know. I’m also concerned that many patients suffered anxiety or unnecessary testing after being referred to urgent care centers, emergency departments, cardiologists or primary care providers and the results of these inappropriate referrals may never be determined.

Here is the study in a nutshell:

  1. Participants enrolled by submitting  information using the iPhone Heart Study app and none of their isubmitted nformation was verified.
  2. An irregular pulse notification was issued to 0.5% of participants who were then  contacted and asked to participate in a Telehealth visit with a doctor (who we will call Dr. Appleseed)
  3. Only 945 of the 2161 who received a pulse notification participated in the first study visit.
  4. Interestingly, Dr. Appleseed was empowered to send participants to the ER if they had symptoms (chest pain, shortness of breath, fainting/losing consciousness) It is not clear how many were sent to the ER and what their outcomes were but this flow diagram shows that 20 were excluded from further testing due to “emergent symptoms.”

  5. Another 174 participants were excluded after finding out at the first visit that they had a history of afib or aflutter and 90 due to current anticoagulant use (both of these factors were exclusion criteria which gives us an idea of how accurate the information was at the time of participant entry.)
  6. After all these exclusions only 658 ECG monitor patches were shipped to the participants of which only 450 were returned and analyzed.
  7. This means of the original 2161 participants who were notified of pulse irregularity, the study only reports data on 450 or 21%. Such a low rate of participation makes any conclusions from the study suspect.
  8. Of the 450 ECG patches analyzed only 34% were classified as having afib. Only 25% of this afib lasted longer than 24 hours.
  9. After the patch data was analyzed, patients had a second Telehealth visit with Dr. Appleseed who reviewed the findings with the patient. Per the initial published description of the methods of the AHS (see here) Dr. Appleseed  would tell the participant to head to the ER if certain abnormalities were found on the ECG.

Per the study description (apple heart study), Dr. Appleseed recommended a visit to the PCP for “AF or any other arrhythmia” detected by the patch:”

“If AF or any other arrhythmias have been detected in reviewing the ambulatory ECG monitor data, or if there are other non-urgent symptom identified by the study physician during the video visit that may need further clinical evaluation, the Study Telehealth Provider directs the participant to his or her primary health care provider”

At this point it seems likely that a lot of participants were instructed to go see their PCPs. Because as someone who looks at a lot of 2 week ambulatory ECG recordings I know that is the rare recording that does not show “other arrhythmias.”

Even more distressing is the call that participants would have received based on “the initial technical read:” I’m presuming this “technical read” was by a technician and not by a cardiologist. In my experience, many initial reads from long term monitors are inaccurate.

“If the initial technical read identifies abnormalities that require urgent attention (ventricular tachycardia or ventricular fibrillation, high-degree heart block, long pauses, or sustained and very rapid ventricular rates), then the participant is contacted immediately and directed to local emergency care or advised how to seek local emergency care.”

I wonder how many  ERs had AHS participants show up saying they had been told they had a life-threatening arrhythmia? How much down stream testing with possible invasive, life-threatening procedures such as cardiac catheterization were performed in response to these notifications?

Overall, these findings add nothing to previous studies using wearable PPG technology and they certainly don’t leave me with any confidence that the  Apple Watch is accurately automatically detecting atrial fibrillation.

Was more harm than good done by the Apple Heart Study?

We will never know. The strength of this study, the large number of easily recruited participants is also its Achilles heel. We don’t know that any information about the participants is correct and we don’t have any validated follow up of the outcomes. In particular, I’m concerned that we don’t know what happened to all of these individuals who were sent to various health care providers thinking there might be something seriously wrong. 

Perhaps Apple and Stanford need to review the first dictum of medicine: Primum Non Nocere, First Do No Harm.

Tachogramophobically Yours,

-ACP