What is the appropriate management for a 73‑year‑old woman with a persistent non‑productive cough after angiotensin‑converting‑enzyme inhibitor (lisinopril) therapy, chronic constipation, orthostatic dizziness, weight loss, variable blood pressure, and recent discontinuation of an angiotensin‑II receptor blocker (losartan)?

Management of Persistent ACE Inhibitor-Induced Cough and Complex Multisystem Symptoms

Continue to wait for the ACE inhibitor-induced cough to resolve (it can take up to 3 months after discontinuation), avoid restarting losartan or any ARB until the cough completely resolves, and prioritize urgent evaluation of the concerning systemic symptoms—particularly the 10-pound weight loss, severe constipation, orthostatic symptoms, and cognitive changes—which suggest a more serious underlying condition requiring immediate investigation before addressing blood pressure management. 1

Addressing the Persistent Cough

Your patient discontinued lisinopril 4 weeks ago, but the cough persists. This is actually within the expected timeframe. ACE inhibitor-induced cough typically resolves within 1-4 weeks of cessation, but in a subset of patients, resolution can be delayed up to 3 months 1. At only 4 weeks post-discontinuation, this patient is still within the normal resolution window.

Critical Point About Losartan

Do not restart losartan yet. While the ACCP guidelines recommend switching to an ARB when ACE inhibitor-induced cough occurs 1, the FDA label data reveals an important caveat: in clinical trials of patients with prior ACE inhibitor-induced cough, losartan still caused cough in 17-29% of patients (compared to 25-35% with placebo/HCTZ and 62-69% with lisinopril rechallenge) 2. Although this is lower than ACE inhibitors, it's not negligible. More importantly, your patient already discontinued losartan 5 days ago due to fatigue and dizziness—suggesting she may not tolerate it well regardless of cough.

Cough Management Algorithm

1. Wait the full 3 months from lisinopril discontinuation before concluding the cough is not ACE inhibitor-related 1
2. If cough persists beyond 3 months, investigate other causes (GERD, postnasal drip, asthma, chronic bronchitis)
3. Do not rechallenge with any ACE inhibitor or ARB until cough completely resolves

The More Urgent Problem: Systemic Red Flags

The cough is actually the least concerning issue here. This patient has multiple alarming features that demand immediate attention:

Red Flag Constellation

• 10-pound unintentional weight loss since April (approximately 4-5 months)
• Severe constipation requiring multiple interventions including prucalopride
• Orthostatic symptoms (dizziness, shakiness, weakness requiring frequent lying down)
• Cognitive changes (memory lapses, word-finding difficulty)
• Low energy and fatigue severe enough to cause retirement
• Globus sensation (something stuck in throat)
• Variable blood pressure with symptomatic improvement only at elevated levels (140-150 mmHg)

Immediate Diagnostic Priorities

Before restarting any antihypertensive, you must evaluate for:

1. Malignancy screening (given weight loss, severe constipation, age, and systemic symptoms)

   • The scheduled colonoscopy is appropriate but may need expediting
   • Consider CT chest/abdomen/pelvis if not already planned
   • Age-appropriate cancer screening

2. Autonomic dysfunction evaluation

   • Formal orthostatic vital signs (supine, sitting, standing at 1 and 3 minutes)
   • Consider autonomic testing if orthostatics are positive
   • Evaluate for causes: diabetes, Parkinson's, multiple system atrophy, paraneoplastic syndromes

3. Endocrine workup

   • TSH and free T4 (she has "subclinical hypothyroid findings"—this needs clarification and possible treatment)
   • Cortisol/ACTH (fatigue, weight loss, orthostatic hypotension suggest possible adrenal insufficiency)
   • Consider pheochromocytoma if BP variability is extreme

4. Neurologic evaluation

   • Cognitive assessment for the memory and word-finding issues
   • Consider brain imaging if cognitive symptoms worsen

5. Medication review

   • Trazodone 150mg may contribute to orthostatic hypotension
   • Magnesium supplements can worsen constipation in some patients
   • Prucalopride side effects include dizziness and fatigue

Blood Pressure Management Strategy

Current Situation Analysis

• Patient reports feeling better when BP is 140-150 mmHg
• Experiences significant fatigue and dizziness with losartan
• Likely has orthostatic hypotension (needs confirmation with orthostatic vitals)

Management Approach

Hold all antihypertensives until:

1. Orthostatic vital signs are obtained
2. Systemic evaluation is complete
3. Cough has fully resolved

If BP control becomes urgently needed before cough resolution:

• First choice: Calcium channel blocker (amlodipine or nifedipine)

  • No cough association
  • May actually help suppress ACE inhibitor-induced cough if any residual effect 1
  • Generally well-tolerated in elderly

• Second choice: Thiazide diuretic (if no contraindications from constipation/electrolytes)

  • Low cough incidence
  • Caution: may worsen orthostatic hypotension

• Avoid ARBs until cough completely resolves and you confirm she can tolerate them

Blood Pressure Targets in This Patient

Given her age (73), orthostatic symptoms, and report of feeling better at 140-150 mmHg, a more permissive BP target of <150/90 mmHg may be appropriate initially. Aggressive BP lowering in the setting of possible autonomic dysfunction could worsen her functional status and quality of life.

Common Pitfalls to Avoid

1. Assuming the cough must be from something else at 4 weeks: ACE inhibitor cough can take up to 3 months to resolve 1

2. Switching to an ARB too quickly: While ARBs have lower cough rates, they're not cough-free, and this patient already had issues with losartan 2

3. Focusing on BP control while missing serious underlying disease: The weight loss, severe constipation, and systemic symptoms are more concerning than mildly elevated BP

4. Treating orthostatic symptoms with more aggressive BP lowering: This patient may have autonomic dysfunction requiring a different approach

5. Ignoring the thyroid issue: "Subclinical hypothyroid findings" may need treatment, as hypothyroidism can cause fatigue, constipation, cognitive changes, and contribute to her symptom complex

Immediate Action Plan

1. Obtain orthostatic vital signs at the next visit (as provider already planned)
2. Complete laboratory evaluation including TSH, free T4, cortisol, CBC, CMP, and consider ESR/CRP
3. Expedite GI evaluation if not already scheduled soon given severity of constipation and weight loss
4. Hold antihypertensives unless BP consistently >160/100 mmHg
5. Reassess cough at 8-12 weeks post-lisinopril discontinuation
6. If BP medication needed urgently: start amlodipine 2.5-5mg daily, monitoring for orthostatic effects

The persistent cough will likely resolve with time; the systemic symptoms require urgent investigation to avoid missing a serious underlying diagnosis that could significantly impact morbidity and mortality.