Physical Side Effects of Surgical Castration (Bilateral Orchiectomy)
Surgical castration causes a predictable constellation of physical side effects due to profound hypotestosteronemia, including hot flashes (experienced by 63-76% of patients), loss of libido (66%), genital shrinkage (55%), weight gain, gynecomastia, fatigue, and long-term metabolic complications including osteopenia and hypercholesterolemia. 1, 2
Immediate and Short-Term Physical Effects
Surgical Complications
- Minimal surgical risk: wound infection, hematoma, and pain are uncommon 1
- Overall surgical complication rate is approximately 3% 3
Vasomotor Symptoms
- Hot flashes occur in 63-76% of patients 2, 4
- Typically begin 1-12 months post-operatively (average 2.7 months) 4
- Duration averages 30 months but can persist until death 4
- Can be effectively controlled with medroxyprogesterone acetate 5mg twice daily 4
Sexual and Genital Changes
- Loss of libido affects 66% of patients 2
- Genital shrinkage occurs in 55% 2
- 22% report changes in sexual orientation 2
Long-Term Metabolic and Systemic Effects
Bone Health
- Osteopenia and increased fracture risk develop with long-term castrate testosterone levels 1
- Bisphosphonate treatment can reduce short-term osteopenia, though long-term benefits remain unestablished 1
Metabolic Changes
- Hypercholesterolemia 1
- Weight gain 1
- Insulin resistance may be less pronounced than with LHRH agonists 5
Hematologic Effects
- Anemia develops more commonly than with medical castration 5
Cardiovascular Considerations
- Increased cardiovascular ischemic events within the first 1.5 years post-castration, particularly in patients ≥65 years, those with hypertension, Charlson comorbidity index ≥3, or prior MI/stroke/coronary heart disease 6
- Higher risk of acute myocardial infarction compared to LHRH agonists, especially in stage IV disease 7
- Lower risk of fracture and peripheral arterial disease compared to LHRH agonists in long-term follow-up 8
Other Physical Effects
Important Clinical Caveats
Testosterone Suppression
- Serum testosterone falls rapidly to castrate levels (<50 ng/dL or <1.7 nmol/L) after bilateral orchiectomy 1, 3
- All patients achieve castrate-level testosterone (median 10 ng/dL) postoperatively 3
Comparison to Medical Castration
While both achieve equivalent testosterone suppression, surgical castration has distinct advantages and disadvantages:
- Lower cost and eliminates compliance issues 1
- Faster onset of palliation 1
- Higher early cardiovascular risk (first 1.5 years) 6, 7
- More anemia and bone demineralization 5
- Less insulin resistance than LHRH analogs, particularly in diabetics 5
Patient Selection Considerations
Most patients prefer medical castration when given the choice, primarily due to the irreversible nature and psychological impact of surgical castration 1. However, orchiectomy remains appropriate for patients with:
- Medication adherence issues (18.4% of patients in one series) 3
- Cost constraints
- Preference for definitive, one-time intervention
The emotional and psychological burden of the procedure represents a greater concern to many men than the physical side effects themselves 1.