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Pregnancy

Talk about every stage of pregnancy, from early symptoms to preparing for birth.

Fetal arrythmia/irregular fetal heartbeat

8 replies

equilibrium25 · 04/10/2020 13:02

I wonder if anyone has any experience of having seen an irregular slow heartbeat in a baby during the second trimester? Either parents or perhaps a resident fetal medicine expert!

We had an ultrasound Friday at 18w+1 and the consultant identified that although the average was 157bpm there was more than one short episode of 30-40bpm. He did not spend more than 30-60s monitoring the heartbeat and all other scan indications are good (heart/brain structure, growth etc.). We only realised things were bad when he called another consultant into the room and they discussed this with us. We will have another scan early next week with the most senior consultant and they prepared us for the worst (we could find no heartbeat) whilst putting no likelihood on any particular outcome. They do say they have seen good outcomes from scenarios like this, but below 40bpm is very low.

The internet has limited information on this, the scientific type papers do not indicate a terribly high likelihood of losing the baby. But clearly that's our fear and may well happen :-(

Background is that we are having 4-weekly scans throughout this pregnancy, attending a special clinic as our second daughter was lost to pre-eclampsia at 39w+2, this very week last year. And our eldest and sole surviving daughter had UGR and was delivered small but safely at 37+5 by induction. We seem to manage to hit every niche and terrifying pregnancy possibility.

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equilibrium25 · 05/10/2020 07:15

Has no-one any experience of anything similar?

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JacobReesMogadishu · 05/10/2020 07:26

At 18weeks gestation there isn’t really the research evidence out there to know what this means. For example a heart rate trace at this gestation couldn’t be interpreted. If he didn’t spend more than 30-60 seconds looking at the heart rate it must have been a very short period where the heart rate was that low, I’m surprised he didn’t spend longer just to see if it happened again. But it’s good that you’re going back for an appt with the senior consultant. I think seeing as everything else is fine and the average heart rate is normal then it’s very likely to be a good outcome. Ive certain known of fetuses at a greater gestation Who have had heart arrhythmia in the last trimester and it’s been an insignificant finding which has resolved at birth.

equilibrium25 · 05/10/2020 11:07

@JacobReesMogadishu

At 18weeks gestation there isn’t really the research evidence out there to know what this means. For example a heart rate trace at this gestation couldn’t be interpreted. If he didn’t spend more than 30-60 seconds looking at the heart rate it must have been a very short period where the heart rate was that low, I’m surprised he didn’t spend longer just to see if it happened again. But it’s good that you’re going back for an appt with the senior consultant. I think seeing as everything else is fine and the average heart rate is normal then it’s very likely to be a good outcome. Ive certain known of fetuses at a greater gestation Who have had heart arrhythmia in the last trimester and it’s been an insignificant finding which has resolved at birth.
Thanks very much JRM. Indeed, research on this is hard to come by. Complete heart block is the scary diagnosis that comes up, but many more positive ones too.
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equilibrium25 · 07/10/2020 09:56

It has been a manic week and I only now have chance to reply properly. All was well at a further scan on Monday afternoon. Scanned by the same consultant with a senior colleague. Put down as a transient event, the heartbeat was fine and all measurements and organ structures look good.

Appreciated the reply JRM - it was one that helped give us extra hope in the run up to the scan.

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JacobReesMogadishu · 07/10/2020 10:15

No problem, glad it was good news.

94kj · 06/12/2023 20:52

Hi @equilibrium25 I wondered how the rest of your pregnancy went? I had this at a scan yesterday, I'm 19 +2 and yesterday they noticed the heart rate dropped to around 60bpm for 5-10 seconds and then back up to 150bpm, so I have an appointment on Friday at the fetal medicine unit. I am beside myself with worry, was everything okay?

equilibrium25 · 09/12/2023 09:58

Hi @94kj im sorry I only just saw your question when i found an email alert

everything turned out just fine. As a rainbow pregnancy it was scary throughout but the arrhythmia was not an issue and a senior consultant allayed our fears a few days later.

i am sat here now with our almost 3 year old boy

how did your appointment go yesterday? I have everything crossed for you

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94kj · 09/12/2023 11:59

Thank you so much for replying, so glad to hear everything turned out well with your son! So at our appointment the fetal medicine doctors couldn't find any problems with babys heart, thank god, and think the slow heart rate was just caused by an inexperienced doctor pushing too hard when doing the ultrasound. So we are releived to say the least! Feel like I can look forward to the rest of the pregnancy again now x

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