Male GU Flashcards
What is a consistent inability to maintain an erect penis with sufficient rigidity to allow for intercourse?
Erectile dysfunction
More than ____% of men ages 40-70 have?
50% of men ages 40-70 have ED. Incidence increases with increasing age.
What is required for an erection? (5)
Intact parasympathetic + somatic nerve supply
Unobstructed arterial flow
Adequate venous constriction
Hormonal stimulation
Psychological desire.
Sedentary lifestyle, obesity, smoking, medical comorbidities such as diabetes, HTN, OSA, dyslipidemia, CV disease, smoking, RLS, watching TV and lower frequency of sexual activity are risk factors for what?
ED
What’s the most common cause of ED?
Decrease in arterial flow from progressive vascular disease
What medications can cause ED?
Antidepressants - SSRIs - MC
Beta blockers
Spironolactone
Thiazide diuretics
Clonidine
Ketoconazole
Cimetidine
What psychosocial factors cause ED?
depression and stress
What are neurologic causes of ED?
Stoke, MS, SCI
What activity causes ED?
Bicycling - prolonged pressure on pudendal and cavernosal nerves/ compromises blood flow to cavernosal artery
Leads to penile numbness and impotence
What endocrine disorders cause ED?
Testosterone deficiency
Hypo/Hyper thyroidism.
What are some important considerations regarding H&P you should think about when your pt has ED?
Ability to masturbate? Timing of dysfunction? Morning wood? Chronic illnesses?
Pelvic or prostate radiation, peripheral vascular dz, medications,
What should you look for in a physical exam for ED?
Look for scarring, plaque formatio nof peyronie disease, testicular atrophy, peripheral neuropathy, HTN.
What are some diagnostic tests to run for ED?
Depends on suspected cause but
CBC, UA, TSH, lipid panel, Serum testosterone, Glucose, prolactin, nocturnal penile tumescence testing, direct injection of vasoactive substances (ie prostaglandins E1) will erect if vascular system is intact.
If you inject prostaglandin E1 into the penis and no erection occurs what should you evaluate next?
Arterial and venous vasculature
Ultrasound of cavernous arteries, pelvic arteriography, cavernosonography.
What is the treatment for ED if psychogenic causes?
Behaviorally oriented sex therapy. –> Those with organic causes will also benefit from counseling.
What is treatment for ED if low T? S/e of treatment?
May benefit from testosterone replacement
Injection, gel, patches
s/e: HTN (increase CV events), worsen BPH, worsen CHF, increased breast cancer, hepatic toxicitiy, VTE, prostate cancer, applicatoin site pruritus, virilization in those exposed.
What is the treatment for ED if obese?
Weight loss
What medication is the mainstay of treatment for ED?
Phosphodiesterase-5 inhibitors (PDE-5)
How do PDE5 inhibitors work? What are examples?
Work by sustaining levels of cGMP within the penile corpora cavernosa to allow for erections in response to appropriate sexual stimuli.
Sildenafil (viagra), vardenafil (levitra), tadalafil (Cialis) - 45-60 minutes prior to anticipated sexual activity.
when are PDE-5 inhibitors contraindicated?
On patients on nitrates. If a man on a PDE5 inhibitor develops CP, delay giving nitrate by 24 hours.
Combo of PDE5 inhibitors and what can result in decrease blood pressure?
A-blockers
nitrates
What medication is used for penile injections for ED?
Alprostadil (caverject)
Prostaglandin E1 injected into base of penis –> smooth muscle relaxation into corpus cavernosum - inject 10-20 minutes before sex. Erection can last >60 mins.
Alprostadil can be injected, but it also comes in tablet form. What do you do with the tablet?
Insert tablet into the urethra –> massage penis for 1 minute to equally distribute the medication.
s/e: penile pain and bleeding.