Erectile Dysfunction

Key Points

• Erectile dysfunction (ED) is the inability to achieve or maintain an erection sufficient for sexual intercourse — affects nearly 30 million men in the United States.
• ED is most often caused by vascular disease (hypertension, heart disease, hyperlipidemia, diabetes) — frequently a sign of underlying cardiovascular risk.
• Medications are a common reversible cause — antidepressants, antihypertensives, 5-α-reductase inhibitors (finasteride), and beta-blockers commonly contribute.
• Treatment: lifestyle modifications → PDE-5 inhibitors (sildenafil/Viagra, tadalafil/Cialis) → vacuum devices → penile injections → penile implants.
• Key nursing safety: PDE-5 inhibitors are absolutely contraindicated with nitrates — combined use causes severe, life-threatening hypotension.
• Provide nonjudgmental, empathetic care — ED profoundly affects self-esteem, intimate relationships, and mental health.

Pathophysiology

Normal erection requires intact vascular, neurological, and hormonal function. Penile erection results from:

1. Sexual stimulation triggers parasympathetic nerve activation
2. Nitric oxide (NO) released → activates guanylate cyclase → increases cGMP
3. Smooth muscle relaxation in corpus cavernosum → increased blood inflow
4. Venous outflow compressed → erection maintained

PDE-5 inhibitors work by inhibiting phosphodiesterase type 5, the enzyme that breaks down cGMP — preserving smooth muscle relaxation and enabling erection.

Risk Factors and Causes

Category	Examples
Vascular	Hypertension, coronary artery disease, hyperlipidemia, peripheral vascular disease, atherosclerosis
Metabolic	Diabetes mellitus (most common metabolic cause — neuropathy + vascular damage), obesity, metabolic syndrome
Hormonal	Low testosterone (hypogonadism), hyperprolactinemia, thyroid disorders
Neurological	Parkinson’s disease, multiple sclerosis, spinal cord injury, radical prostatectomy nerve damage
Pharmacological	Antidepressants (SSRIs), antihypertensives (beta-blockers, thiazides), 5-α-reductase inhibitors (finasteride), antipsychotics
Psychological	Depression, anxiety, stress, relationship conflict, performance anxiety
Lifestyle/Other	Smoking, alcohol misuse, substance use, penile trauma, BPH

Assessment and Diagnostics

• Diagnosis is primarily based on patient-reported symptoms and history — no single diagnostic test confirms ED
• History: Sexual history (onset, severity, presence of morning erections), relationship status, medication review, cardiovascular history, psychological assessment
• Screening for psychological disorders: Depression, anxiety, and stress are common contributors — screen with validated tools
• Laboratory tests: Testosterone level, fasting glucose (diabetes), lipid panel, thyroid function (to identify underlying causes)
• Penile Doppler ultrasound: Assesses arterial blood flow to penis — used when vascular cause is suspected

Treatment

Intervention	Description
Lifestyle modifications	Weight loss, smoking cessation, exercise, limit alcohol; treat underlying hypertension and diabetes
PDE-5 inhibitors (first-line pharmacotherapy)	Sildenafil (Viagra), Tadalafil (Cialis), Vardenafil (Levitra), Avanafil — enhance erectile response to sexual stimulation
Vacuum-assisted erection devices	External device creates negative pressure → draws blood into penis → constriction band maintains erection
Penile injections	Alprostadil (prostaglandin) injected directly into corpus cavernosum — bypasses neurological and vascular components
Penile implants (last resort)	Surgically implanted inflatable or malleable prosthesis; permanent solution when other therapies fail
Psychotherapy	Cognitive-behavioral therapy, sex therapy, couples counseling — addresses psychological contributing factors

PDE-5 Inhibitors — Key Pharmacology

Drug	Brand	Onset	Duration	Key Notes
Sildenafil	Viagra	30–60 min	4–6 hr	Must take 30–60 min before activity; food slows absorption
Tadalafil	Cialis	30 min	Up to 36 hr	”Weekend pill”; also approved for BPH
Vardenafil	Levitra	30–60 min	4–5 hr	—

Absolute Contraindication: Nitrates

PDE-5 inhibitors + any nitrate (nitroglycerin, isosorbide) = life-threatening hypotension. Patients taking nitrates for chest pain MUST NEVER take PDE-5 inhibitors. Instruct patient: if chest pain occurs after taking a PDE-5 inhibitor, do NOT take nitroglycerin — call 911 instead.

Other safety points:

• Antihypertensive medications combined with PDE-5 inhibitors → additive hypotension; monitor for dizziness, syncope
• Priapism (erection lasting >4 hours) is a urological emergency — requires immediate medical intervention

Nursing Care

NCLEX Focus

Key nursing priorities for ED: (1) absolute contraindication with nitrates — patient must not take both; (2) provide nonjudgmental environment; (3) lifestyle modifications as first-line; (4) assess for depression and anxiety as contributing factors; (5) if taking antihypertensives, monitor for additive hypotension with PDE-5 inhibitors.

• Environment: Create a comfortable, nonjudgmental, private setting — patients are often embarrassed and reluctant to discuss sexual health
• Medication education: PDE-5 inhibitors — explain timing, contraindications with nitrates, when to seek emergency care for priapism
• Lifestyle education: Strongly encourage smoking cessation, weight loss, glycemic control, and exercise — these address vascular causes directly
• Psychosocial support: Acknowledge emotional impact; facilitate psychotherapy or couples counseling referrals
• Partner inclusion: With patient consent, include partner in education to address relationship impact

Related Concepts

• benign-prostatic-hyperplasia — BPH is a direct cause of ED; 5-α-reductase inhibitors used for BPH also cause ED as a side effect.
• alpha-blockers — Alpha-1 blockers used for BPH; combined with PDE-5 inhibitors → additive hypotension risk.
• coronary-artery-disease — Cardiovascular disease is the most common underlying cause of organic ED.
• diabetes-mellitus — Diabetes causes both vascular and neurological ED through chronic complications.
• depression — Psychological disorders including depression contribute to ED; antidepressants (SSRIs) also cause sexual dysfunction.

Self-Check

1. A patient with ED is prescribed sildenafil but also takes sublingual nitroglycerin PRN for chest pain. What is the priority nursing education?
2. A patient calls 4 hours after taking sildenafil, reporting a painful erection that won’t subside. What is the priority nursing instruction?
3. What lifestyle modifications have the strongest evidence for improving erectile dysfunction related to vascular disease?