How should an elderly patient with focal segmental glomerulosclerosis be treated?

Treatment of Elderly Patients with FSGS

In elderly patients with idiopathic FSGS and nephrotic syndrome, calcineurin inhibitors (CNIs) should be considered as first-line therapy rather than high-dose corticosteroids, given the higher risk of steroid-related complications in this age group. 1

Initial Assessment and Conservative Management

Before initiating immunosuppression, you must:

• Exclude secondary FSGS (obesity-related, medication-induced, viral infections, adaptive hyperfiltration) as these forms do not respond to immunosuppression 1, 2
• Confirm nephrotic syndrome (proteinuria >3.5 g/day AND serum albumin <30 g/L) - immunosuppression is only indicated when full nephrotic syndrome is present 1, 3
• Start conservative therapy immediately: ACE inhibitors or ARBs, aggressive blood pressure control (target <120 mmHg systolic), dietary sodium restriction (<2 g/day), and statins for hyperlipidemia 4

Critical caveat: Do not start ACE inhibitors/ARBs in patients with abrupt-onset nephrotic syndrome due to acute kidney injury risk 4. Monitor creatinine closely and hold these medications during volume depletion.

Immunosuppressive Therapy Selection

First-Line: CNIs Over Corticosteroids in Elderly

The evidence strongly supports CNIs as first-line therapy in elderly patients because:

• Elderly patients have relative contraindications to high-dose steroids (diabetes risk, osteoporosis, psychiatric effects, obesity) 1
• In the case example provided, an obese elderly patient with elevated HbA1c and family history of diabetes was appropriately started on cyclosporine rather than prednisone 1
• Observational data from elderly FSGS patients showed 44% complete remission with steroid therapy, but the advanced age increases complication risks 5

CNI Dosing Protocol

Cyclosporine: Start at 3-5 mg/kg/day in divided doses

• Target trough level (C0): 100-175 ng/mL
• Continue for minimum 4-6 months to assess response 1, 2, 6
• If partial or complete remission achieved, continue for at least 12 months, then slow taper 1, 6

Tacrolimus: Start at 0.05-0.1 mg/kg/day in divided doses

• Target trough level: 5-10 ng/mL
• Same duration principles as cyclosporine 6, 3
• May have less hypertension/dyslipidemia than cyclosporine but higher diabetes risk 6

In elderly patients, cyclosporine may be preferable to tacrolimus given lower tendency to precipitate diabetes 1

Alternative: Corticosteroids (If CNIs Contraindicated)

If CNIs cannot be used:

• Prednisone 1 mg/kg/day (maximum 80 mg) OR alternate-day 2 mg/kg (maximum 120 mg)
• Continue high-dose for minimum 4 weeks, up to maximum 16 weeks or until complete remission 1, 2, 3
• Taper slowly over 6 months after achieving complete remission 1, 3

However, in elderly patients, the likelihood of response is lower and complication risk is substantially higher 5, 7

Steroid-Resistant Disease

If no response after 16 weeks of corticosteroids (steroid-resistant FSGS):

1. Switch to cyclosporine 3-5 mg/kg/day for at least 4-6 months 1, 2
2. If partial/complete remission, continue for at least 12 months then slow taper 1, 2
3. If cyclosporine intolerant: Consider MMF (500-1000 mg twice daily) plus high-dose dexamethasone 1, 2

Recent case reports suggest tacrolimus plus MMF combination may be effective as steroid-sparing therapy 8, though this lacks robust trial data.

Monitoring and Treatment Goals

Target outcomes:

• Complete remission: Proteinuria <0.3 g/day
• Partial remission: ≥50% reduction in proteinuria to <3.5 g/day
• Preserve GFR (decline <20%) 9

Monitor closely:

• Monthly proteinuria and serum creatinine
• CNI trough levels every 2-4 weeks initially
• Blood pressure at every visit
• Assess for CNI nephrotoxicity (rising creatinine without proteinuria increase) 9, 6

When NOT to Treat

Do not use immunosuppression if:

• Proteinuria without nephrotic syndrome (unless progressive renal dysfunction) 1, 2, 3
• eGFR <25-30 mL/min/1.73m² with small kidneys on ultrasound 1
• Secondary FSGS identified 2, 1
• Genetic forms confirmed (though genetic testing not routinely indicated in elderly) 1, 2

Key Pitfalls to Avoid

1. Starting immunosuppression without confirming true nephrotic syndrome - many elderly patients have proteinuria from other causes
2. Using high-dose steroids as first-line in elderly with diabetes risk factors - CNIs are safer 1
3. Stopping CNIs too early - need minimum 12 months after remission to prevent relapse 1, 6
4. Ignoring conservative management - RAS blockade and BP control are essential regardless of immunosuppression choice 4
5. Continuing CNIs despite rising creatinine - if creatinine increases >30% and doesn't plateau with dose reduction, discontinue 6

The evidence consistently demonstrates that achieving any degree of remission (complete or partial) significantly improves renal survival compared to no remission 5, 10, 11, making aggressive but carefully selected therapy worthwhile even in elderly patients who can tolerate it.