My OH had a mini stroke, followed by an operation for partially blocked carrotid artery,
7 months before we were due to visit family in NZ. Fortunately he recovered well and we went on a strict health regime for weight loss, cholesterol etc. We got written reports from Dr and consultant before leaving UK and gave everything to GP in NZ. After the exaninations he was happy to complete and sign the medical forms and state that we had no issues.
First INZ query was a repeat blood test for me - first one had been affected by residual traces of a urine infection I had just before leaving UK. Repeat test was normal.
Second, later, query was to ascertain if OH had fully recovered and was capable of independent day to day living (ie.was he going to be a drain on the NZ health service!) GP did the standard test for dementia (score 30/30) and also wrote a report.
We have heard nothing further but are expecting possible follow-up queries and/ or referral to MA when we eventually get a case officer.
You can download the medical forms from the INZ website and see what they require.