Thanks, everyone, for your tips. I wanted to update the thread in case anyone looking for the same things, found the thread and an update was useful.
Hospital-style table
@jacko was quite right. The tables were in Fascino on Pattaya Nua. I hadn't looked hard enough -- they're against the wall in the Hall of Walkers.
La-Z-Boy riser armchair
Thanks to the tip from @BigDUSA, I tracked down the La-Z-Boy Pinnacle (catalogue #512). It is new (to Thailand, anyway) so the shops I found that stock La-Z-Boys didn't know about it. Fortunately, I'd put a screenshot picture on my iPhone, so they believed me when I showed them, and they looked it up in their catalogues or phoned the "factory" to find out more.
La-Z-Boy stockists in Pattaya are:
Central in Central Festival (Beach Road/Second Road)
Home Works (Sukhumvit), and
Pattaya Furniture Centre on Pattaya Nua (about a block beyond Fascino and Tesco/Lotus on the left side as you come up from the Dolphin roundabout).
My favourite was the Pattaya Furniture Centre. The staff were particularly lovely and they immediately offered a 20% discount (from 62,000 baht, which was their list price and the price in Central). Estimates of delivery time (from Central and Pattaya Furniture Centre were one month and two weeks, respectively). Home Works doesn't stock it and didn't offer to order it, but they did call Central for me.
Lastly, thanks to @bigmick for the tip about the place on Threppasit Road. I've only just seen this -- Dad's back in hospital, so we've been busy -- and I will check it out.
I don't want to malign the healthcare anywhere, besides I'm not qualified to make comparisons, having been in this particular situation on this once.
The only thing I do know is that Dad's had amazing care at the Bangkok Pattaya Hospital and I'm confident he's being well looked after. Within four hours of getting him in here the first time, he'd seen a heart specialist, a neurologist, and had X-rays, and various other tests. And we were just walk-ins, no appointments. It was impressive.
The second time we came in an ambulance and I've no reason to believe they would have got him to hospital faster anywhere else, or that they'd have been putting him into an MRI straight out of the ambulance. And, based on his regimen, I can't imagine they could give him any more blood thinners, and anti-platelet and anti-coagulant medication than he's on at the moment!