What is the diagnosis and appropriate treatment, including medication dosages, for an 18‑year‑old male with sudden severe hypogastric pain, hematuria, bilateral 3‑mm renal calculi (non‑obstructive) and mild left hydroureteronephrosis, who is vomiting possibly due to tramadol?

Diagnosis and Treatment for 18-Year-Old Male with Renal Colic

Switch immediately from tramadol to an NSAID (diclofenac 50-75 mg IM/IV or ibuprofen 400-600 mg PO) for pain control, as NSAIDs are first-line for renal colic and tramadol is causing significant vomiting. 1

Diagnosis

Bilateral nephrolithiasis with left-sided renal colic and mild hydroureteronephrosis

The clinical picture indicates:

• Acute renal colic from the left kidney (explaining the hypogastric pain and hematuria)
• Bilateral 3mm renal calculi (non-obstructive in both kidneys)
• Left mild hydroureteronephrosis suggests the left-sided stone may have recently passed into the ureter or there is partial obstruction

The absence of burning micturition makes UTI less likely, but this must still be ruled out.

Immediate Management

1. Pain Control - Critical Priority

Stop tramadol immediately. The vomiting is almost certainly tramadol-related, as opioids (particularly tramadol) are associated with high rates of nausea and vomiting compared to NSAIDs 1, 2. The FDA label explicitly warns about gastrointestinal symptoms including vomiting 2.

Administer an NSAID as first-line therapy:

• Diclofenac 50-75 mg IM or IV (preferred for severe pain), OR
• Ibuprofen 400-600 mg PO (if patient can tolerate oral), OR
• Metamizole 1-2.5 g IV (if available in your region)

NSAIDs are superior to opioids for renal colic because they reduce prostaglandin-mediated ureteral spasm and inflammation, provide better pain relief, and have significantly lower rates of vomiting 1.

2. Antiemetic Therapy

Administer ondansetron 4-8 mg IV/PO or metoclopramide 10 mg IV to control the vomiting, which will also improve oral intake and hydration.

3. Essential Laboratory Work-Up

Obtain immediately 1:

• Urinalysis with dipstick (already shows hematuria; check for infection)
• Urine culture (mandatory before any intervention)
• Serum creatinine (assess renal function given hydroureteronephrosis)
• Complete blood count
• C-reactive protein (assess for infection/inflammation)
• Serum uric acid, ionized calcium, sodium, potassium

4. Assess for Urgent Intervention Needs

Rule out emergent conditions requiring immediate urological intervention:

• Sepsis/infection with obstruction (fever, elevated WBC, CRP) → requires urgent decompression 1
• Anuria → requires urgent decompression 1
• Intractable pain despite adequate analgesia
• Worsening renal function

The mild left hydroureteronephrosis is concerning but not immediately emergent if the patient is afebrile, has adequate urine output, and pain is controlled with NSAIDs.

Definitive Management Strategy

Conservative Management (Appropriate for This Patient)

Medical Expulsive Therapy (MET) with alpha-blocker:

• Tamsulosin 0.4 mg PO once daily for up to 4-6 weeks 1
• MET is most beneficial for stones >5mm in the distal ureter, but the 3mm stones should pass spontaneously with supportive care 1
• The mild hydroureteronephrosis suggests a stone may be in the left ureter

Hydration:

• Encourage oral fluid intake of 2-3 liters daily
• Adequate hydration facilitates stone passage

Follow-up imaging within 14 days:

• Repeat ultrasound or low-dose CT to assess stone position and resolution of hydroureteronephrosis 1, 3
• Monitor for stone passage (strain urine to capture stone for analysis)

Pain Management at Home

Prescribe NSAIDs for outpatient use:

• Ibuprofen 400-600 mg PO every 6-8 hours as needed (maximum 2400 mg/day)
• OR Diclofenac 50 mg PO every 8 hours as needed
• Use the lowest effective dose for the shortest duration 1

Avoid opioids unless NSAIDs are contraindicated or ineffective. If absolutely necessary, use an agent other than tramadol (e.g., hydromorphone 2-4 mg PO every 4-6 hours) with an antiemetic 1.

Critical Pitfalls to Avoid

1. Do not continue tramadol - it's causing the vomiting and is inferior to NSAIDs for renal colic 1, 2

2. Do not miss infection - always obtain urine culture before any intervention; infected obstructed kidney requires urgent decompression 1

3. Do not ignore the hydroureteronephrosis - this requires follow-up imaging within 2 weeks to ensure resolution 1, 3

4. Monitor renal function - even small stones can cause obstruction and AKI if persistent 4

5. Ensure stone analysis - all first-time stone formers should have stone composition analyzed to guide prevention 1

When to Intervene Surgically

Indications for urological referral/intervention:

• Stone fails to pass after 4-6 weeks of conservative management
• Progressive or persistent hydroureteronephrosis
• Worsening renal function
• Recurrent severe pain despite adequate analgesia
• Signs of infection with obstruction
• Patient preference or inability to tolerate conservative management

For 3mm stones, spontaneous passage rate is >90%, so surgical intervention is unlikely to be needed 3.

Long-term Prevention

After acute episode resolves:

• Increase fluid intake to maintain urine output >2 liters/day (lifelong recommendation)
• Stone analysis to guide specific preventive therapy
• Consider metabolic evaluation if high-risk features present (young age, bilateral stones, family history)
• Dietary modifications based on stone composition once known

1, 3