September 25, 2023

Changing dual-antiplatelet remedy (DAPT) with clopidogrel alone 1 month after percutaneous intervention (PCI) presents a decrease danger of bleeding with comparable safety in opposition to cardiovascular occasions, based on two subgroup analyses of the Japanese STOPDAPT-2 and STOPDAPT-2 ACS trials.

The target of those two analyses was to judge whether or not there was a benefit-to-risk ratio benefit for individuals who entered the examine with excessive bleeding danger or who had undergone a posh PCI. General, bleeding danger was diminished and not using a main improve in cardiovascular occasions no matter subgroup, based on outcomes revealed by a multicenter group of Japanese investigators.

On this substudy, just like the beforehand revealed research from which the information have been drawn, the first endpoint was a composite of cardiovascular dying, myocardial infarction, particular stent thrombosis, stroke, and Thrombolysis In Myocardial Infarction bleeding (main or minor).

The proportion of sufferers within the 1-month and 12-month DAPT teams reaching this composite endpoint at 1 yr was not considerably completely different amongst sufferers stratified by baseline bleeding danger or by PCI complexity, based on a multicenter group of authors led by Takeshi Kimura, MD, division of cardiovascular medication, Kyoto College.

Shortened DAPT is focus of a number of trials

The brand new evaluation, published in JACC Asia, is a follow-up to the 2019 STOPDAPT-2 trial, revealed in JAMA, and the 2022 STOPDAPT-2 ACS trial, revealed in JAMA Cardiology. The primary examined 1- versus 12-month DAPT in PCI sufferers receiving a drug-eluting stent. The second examine in contrast the identical methods in sufferers present process PCI to deal with an acute coronary syndrome (ACS).

Each research have been carried out in Japan. DAPT consisted of the P2Y12 receptor inhibitor clopidogrel plus aspirin. The experimental arm acquired this routine for 1 month adopted by clopidogrel monotherapy. The management arm remained on DAPT for 12 months.

The examine is doubtlessly necessary as a result of it addresses the problem of discovering “the candy spot of antiplatelet remedy in East Asian sufferers,” based on the coauthors of an accompanying editorial in the identical concern of JACC Asia.

Earlier knowledge recommend East Asians have the next danger of bleeding however decrease anti-ischemic advantages from DAPT remedy, defined the coauthors, Antonio Greco, MD and Davide Capodanno, MD, PhD, each from the College of Catania (Italy). They praised the hassle to discover this query.

Within the STOPDAPT-2 trial, the shortened DAPT routine was related to a considerably decrease charge of a composite endpoint of cardiovascular and bleeding occasions than normal DAPT, assembly standards for superiority in addition to noninferiority. Within the STOPDAPT-2 ACS trial, shortened DAPT failed to realize noninferiority to straightforward DAPT due to a rise in cardiovascular occasions regardless of a discount in bleeding occasions.

Neither of those research particularly in contrast shortened to straightforward DAPT in sufferers with excessive bleeding danger or in sufferers who underwent advanced PCI, that are among the many most typical affected person teams by which to contemplate a modified DAPT routine. To do that, two new substudies have been carried out with the mixed knowledge from 5,997 sufferers within the two STOPDAPT-2 trials.

Two candidate teams for shortened DAPT evaluated

Within the first substudy, the 1,893 sufferers who met standards for prime bleeding danger have been in contrast with the 4,104 who didn’t. In these with a excessive danger of bleeding, the proportion reaching a main endpoint at 1 yr was decrease, however not considerably completely different, for these on 1-month versus normal DAPT (5.01% vs. 5.14%). This was additionally true in these with out an elevated bleeding danger (1.90% vs. 2.02%).

Within the second substudy, 999 sufferers who had a posh PCI, outlined by such traits as implantation of a minimum of three stents or persistent complete occlusion within the goal lesions, have been in contrast with the 4,998 who didn’t. Once more, the first endpoint was decrease in each those that had a posh PCI (3.15% vs. 4.07%) and those that didn’t (2.78% vs. 2.82%).

Not surprisingly, sufferers with a excessive bleeding danger benefited from a considerably decrease danger of bleeding occasions on the 1-month DAPT routine (0.66% vs. 2.27%). The fee was the next danger of cardiovascular occasions (4.35% vs. 3.52%), however this distinction didn’t attain significance. These with out an elevated bleeding danger additionally had a decrease danger of bleeding occasions (0.43% vs. 0.85%) however the next danger of cardiovascular occasions (1.56% vs. 1.22%). Once more, variations have been nonsignificant. Within the substudy evaluating DAPT period in relation to advanced PCI, the speed of cardiovascular occasions at 1 yr in these handled with brief versus 12-month DAPT was almost equivalent (2.53% vs. 2.52%). Within the non–advanced PCI sufferers, occasion charges have been nonsignificantly higher on the shortened DAPT routine (2.38% vs. 1.86%), however the bleeding charge was decrease on shortened DAPT whether or not PCI had been advanced (0.63% vs. 1.75%) or not (0.48% vs. 1.22%).

Within the absence of any main sign that advanced PCI benefited from longer period DAPT, “advanced PCI may not be an applicable determinant for DAPT durations,” based on Dr. Kimura and coinvestigators.

Research knowledge may not be generalizable

Dr. Greco and Dr. Capodanno identified that there are variations between sufferers and PCI practices in Japan relative to different areas of the world, limiting the generalizability of those findings even when the query is related.

“That is an method that is likely to be recommended for sufferers at excessive bleeding danger who’ve the traits of the sufferers enrolled within the STOPDAPT-2 trials,” Dr. Capodanno stated in an interview. In his personal PCI follow treating ACS sufferers, “I’d not really feel protected sufficient with clopidogrel monotherapy after only one month.”

He considers the ACS inhabitants to have a very “delicate bleeding-ischemia trade-off,” which is why he thinks this query is related and must be explored additional in further populations. Nevertheless, he would possibly design trials otherwise in his personal follow setting. For instance, he would on the very least be excited about testing a stronger P2Y12 inhibitor resembling ticagrelor when contemplating a single antiplatelet agent after a restricted course of DAPT.

One message from this examine is that “bleeding danger trumps PCI complexity,” based on Deepak L. Bhatt, MD, who lately assumed the place of director of Mount Sinai Coronary heart in New York. He favored the method the investigators took to deal with a posh and related scientific concern, however he additionally expressed reservations in regards to the scientific applicability of this subgroup evaluation.

“We actually want extra knowledge earlier than uniformly shortening DAPT period in all sufferers,” Dr. Bhatt stated in an interview. He considers this a sizzling scientific concern that’s prone to generate extra trials. He hopes these will present extra definitive proof of when and the way DAPT period could be diminished. General, he anticipates progress towards tailoring remedy in particular populations with a view to obtain the most effective risk-to-benefit stability.

Dr. Kimura has monetary relationships with Boston Scientific, Daiichi Sankyo, Sanofi, Terumo, and Abbott Medical Japan, which supplied funding for the STOPDAPT-2 and STOPDAPT-2 ACS trials. Dr. Capodanno reported monetary relationships with Amgen, Area, Chiesi, Daiichi Sakyo, Sanofi Aventis, and Terumo. Dr. Bhatt reported monetary relationships with greater than 20 pharmaceutical firms, together with Abbott Medical.

This text initially appeared on, a part of the Medscape Skilled Community.