Alin Wong — integrated analysis of blood pressure log & pathology, with action plan

Summary

Five indicators sit outside the reference range on the 11 July bloods. When they are read against the blood-pressure log rather than in isolation, two of them largely dissolve, one is probably a measurement trough, and only the anaemia is genuinely unexplained. The blood pressure — contrary to the 24 July review — is the best it has been in the whole series.

1 · What the correlation changes

ESR 26 is not a finding

The age-adjusted upper limit for an 82-year-old woman — (age + 10) / 2 — is 46 mm/hr. Westergren ESR is additionally inflated by a low haematocrit through reduced rouleaux hindrance, and her PCV is 0.34. An ESR in the mid-20s is exactly what this haematocrit predicts at this age. There is no inflammatory signal here requiring explanation. The 24 July review placed "occult inflammation / malignancy" at 25% substantially on the strength of this number; that weighting is not supported.

Anaemia of chronic disease is effectively excluded

ACD produces low serum iron and low transferrin saturation alongside a high ferritin. She has iron 22 µmol/L and TSAT 38% — high-normal. This is the wrong pattern, and it also confirms that the ferritin of 245 reflects genuine iron repletion rather than an acute-phase response.

The eGFR was drawn at the bottom of a trough

Blood was collected fasting at 09:45 on Saturday 11 July. Her readings that morning were 115/70, 111/71, 117/70 — a daily average of 114.3, the lowest morning of that week, in which every other day ran 121–138 systolic. She was fasted, so without overnight fluid, and on an ARB, which removes glomerular autoregulation. A low-perfusion morning translates directly into a lower measured eGFR.

Honest counter-evidence: the urea:creatinine ratio is essentially unchanged (2023: 6200/63 = 98; 2026: 7100/73 = 97) and sodium was 144 on both draws, so her volume status on the day was no worse than in 2023. A pre-renal component explains part of the fall, not all of it — some real decline is likely. Pulling the other way, sarcopenia at 82 lowers creatinine production, so a rise from 63 to 73 may understate the true change.

2 · The blood-pressure record

Variability has halved on the current dose

The clinically important number is not the average — which barely moved across all four regimens — but the spread. On 20 mg nightly the standard deviation of systolic readings fell to 7.2 mmHg, no reading fell below 110 or rose above 140, and there have been zero symptomatic episodes in 37 days. Every dizziness event in the record occurred on a higher dose.

The mechanism is volume, not autonomic failure

Across 77 days, systolic pressure and pulse move in opposite directions (r = −0.39). On her lowest days the heart rate is at its highest — 17 May: 110 systolic with a pulse of 90; 18 June: 109 with 90; 24 June: 120 with 88. In autonomic failure this would not happen — the defining feature of baroreflex failure is a heart rate that does not compensate when pressure drops.

Her baroreflex is intact and working. That reframes the instability from a fixed, untreatable age-related autonomic problem to a preload and volume problem — which is exactly what the event log describes (coffee, hot days, inadequate fluid, GI upset), and which is fixable. Layered on top is arterial stiffness: mean pulse pressure 53 mmHg, 19% of readings at or above 60, peak 81. A stiff aorta amplifies every change in stroke volume, which is why small shifts in fluid status produce large systolic swings.

3 · The anaemia — the one real unknown

The red cell indices are internally consistent (Hb/PCV = 312 ≈ MCHC 315; PCV/RCC = 97.7 ≈ MCV 97), so this is not a laboratory artefact. The concerning combination is two lineages drifting down — red cells and platelets — with a rising MCV, on fully replete iron and B12. It is mild and slow, roughly 2.3 g/L per year, but it is the wrong direction on three years of iron replacement.

Ranked causes

Macrocytosis: what is already excluded

Working through the MCV differential removes most of it on existing results — B12 deficiency (628 pmol/L), hypothyroidism (TSH 0.81), liver disease (ALT 8, AST 16, GGT 12, ALP 48, bilirubin 15), alcohol (confirmed non-drinker) and drug causes (none on the medication list). Only three candidates remain — folate deficiency, reticulocytosis and MDS — and all three are settled by the same three cheap tests.

4 · Kidney function

The "4.7 mL/min per year, five times normal" figure in the 24 July review is over-read. Two points three years apart cannot define a slope — the data are equally consistent with a single step change from a hypotensive episode. The genuinely reassuring finding is ACR 1.2 (category A1, no albuminuria), the single strongest prognostic marker in chronic kidney disease.

5 · Irregular heartbeat & measurement gaps

Nineteen IHB detections, all clustering at low systolic and diastolic with an elevated pulse — six of them in a single eleven-minute run on 17 May at 95–119 systolic, pulse 88–99. One new detection on the morning of 28 July (117/73, pulse 76), the first since 7 July. The pattern is most consistent with ectopy during hypotension or low-amplitude oscillometric artefact, not atrial fibrillation. A 12-lead ECG is bulk-billed and closes the question permanently.

Four gaps materially limit what the data can say:

• All 276 readings fall between 06:00 and 11:00. One evening reading exists in the entire series. Afternoon, evening and nocturnal pressure are completely unobserved, so postprandial hypotension — a leading cause of falls over 80 — would be invisible.
• Orthostatic BP has never been measured, despite being recommended on 2 July.
• No ECG has been performed.
• No weight recorded since 18 May (58 kg). Weight loss would materially change the anaemia differential.

6 · Recommended actions

Everything worth doing collapses into one GP visit and one blood draw in mid-August. Until that draw happens, the most valuable thing to do is not change anything that would contaminate it.

7 · What the results will mean

8 · Where this differs from the 24 July review