NURS 1950: Pharmacology 1. 2 3 4 Diuretics work in the kidney at various sites of the nephron Can...
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Transcript of NURS 1950: Pharmacology 1. 2 3 4 Diuretics work in the kidney at various sites of the nephron Can...
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NURS 1950: Pharmacology
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Objective 1: list two (2) major physiological functions of the kidneys
Objective 2: list the four (4) processes carried out by the nephron
Objective 3: name the part of the nephronresponsible for each of the processes
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Objective 4: name the pituitary hormone that influences the urine volume
Objective 5: name the adrenocorticalhormone that influences the urine volume
Objective 6: list the four (4) ways in which fluid is normally lost from the body
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Objective 7: describe the actions of diuretics
Diuretics act to
Deplete blood volume
Excrete sodium
Vasodilate peripheral arterioles (how is unknown)
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Diuretics work in the kidney at various sites of the nephron
Can interfere with the action of aldosterone causing loss of sodium◦Where goes sodium, so goes water
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What happens with diuretics◦Decrease excess water◦Loop diuretics + 0.9% NaCl = loss of calcium
◦Decrease excess NaCl◦Decrease cerebral edema (Mannitol)
◦Decrease increased IOP (Diamox)
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Mannitol is an osmotic diuretic (a sugar); ◦in the brain, its presence causes water to be drawn to it
Works the same way in the eye: ◦the excess intraocular fluid is drawn to the mannitol in the hyperosmotic plasma
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◦Diamox very weak diuretic Useful in treating glaucoma
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◦Aminophylline◦Theophylline◦Caffeine◦Theobromine Diuretic effect from improved blood flow to kidney
Generally not used for diuretic effect
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Action of the thiazides◦ Act on the distal tubules of the kidney
Block reabsorption of sodium and chloride ions from the tubule
The unreabsorbed Na and Cl ions pass into the collecting ducts, taking water with them
Thiazides have antihypertensive properties because of direct vasodilation effect on peripheral arterioles◦ Expected outcomes from treatment
Decreased edema and improvement of symptoms RT excess fluid accumulation
Reduction in BP
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Assessments◦Mental status◦Diabetics require baseline blood glucose◦Assess hearing◦Assess for symptoms of acute gout
SE to expect: orthostatic hypotension◦Usually in initial stages of treatment◦Teach client safety measures
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SE to report◦GI irritation, N/V, constipation◦Electrolyte imbalance, dehydration◦Hyperuricemia ◦Hyperglycemia◦Hives, rash
Thiazides can interact with◦Digoxin, corticosteroids◦Lithium, NSAIDs◦Oral hypoglycemic agents
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Thiazides can interact with◦Digoxin, corticosteroids◦Lithium, NSAIDs◦Oral hypoglycemic agents
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Thiazide diuretics include◦Bendroflumethiazide (Naturetin)◦Chlorothiazide (Diuril)◦Hydrochlorothiazide (HCTZ) {Esidrix, HydroDiuril}
◦Polythiazide (Renese)◦Trichlomethiazide (Naqua, Metahydrin, Diurese)
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Thiazide-like drugs include◦Chlorthalidone (Hygroton)◦Indapamide (Lozol)◦Metolazone (Zaroxolyn)
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Drugs that affect the loop of Henle◦Bumetanide (Bumex)◦Ethacrynic acid (Edecrin)◦Furosemide (Lasix)◦Torsemide (Demadex)
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Act in the loop of Henle in the kidney◦Inhibits Na and Cl reabsorption
Some increase blood flow to glomeruli
Inhibits electrolyte absorption in proximal tubule◦Lose sodium, chloride, potassium, magnesium, sodium bicarbonate
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Onset of diuretic effect varies, but is within 1-2 hours. IV, drugs work within 5-10 minutes
Peak effect within 1-2 hoursDuration approximately 6 hours
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Maximum mg/day◦ Bumex 10 mg per 24 hours◦ Edecrin 400 mg per 24 hours◦ Lasix 1000 mg/24 hours
Cross sensitivities◦ Sulfonamides and Lasix, Demadex
SE to expect◦ Oral irritation◦ Dry mouth◦ Orthostatic hypotension
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SE to report with loop diuretics◦ GI irritation, abdominal pain◦ Electrolyte imbalance, dehydration◦ Hives, pruritus, rash◦ Some can cause loss of hearing and
hyperglycemia (interfere with hypoglycemic agents)
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Drug interactions◦Alcohol, barbiturates, narcotics◦Aminoglycosides◦Cisplatin ◦NSAIDs◦Corticosteroids◦Probenecid◦Digoxin
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Loop diuretics include◦Bumetanide (Bumex)◦Ethacrynic acid (Edecrin)◦Furosemide (Lasix)◦Torsemide (Demadex)
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Why is there concern about the electrolyte balance?
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Weak antihypertensives Mechanism of action unknown Do work in distal renal tubule
◦Retains potassium◦Excretes sodium◦Some have anti-aldosterone activity
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Maximum dosing per 24 hrs◦ drug dependent
SE to expect with Midamor: ◦anorexia, N/V, flatulence and HA
SE to report: ◦electrolyte imbalance, dehydration,
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SE to expect and report with Aldactone and Dyrenium: ◦mental confusion, HA, diarrhea, electrolyte imbalance, dehydration, gynecomastia, reduced libido, breast tenderness
Dyrenium can also cause allergic reaction (hives, pruritus, rash)
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Generally, drug interactions for the K+ sparing agents◦ Lithium, ACE inhibitors, salt substitutes, K+
replacement◦ NSAIDs,
Potassium-sparing drugs include◦ Amiloride (Midamor)◦ Spironolactone (Aldactone)◦ Triamterene (Dyrenium)
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Potassium-sparing drugs include◦Amiloride (Midamor)◦Spironolactone (Aldactone)◦Triamterene (Dyrenium)
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Why is an adequate fluid intake important with diuretic therapy?
If the client has to get up during the night to void, what will they probably do?
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What are some good dietary sources of potassium?
If a client is on Aldactone, what would you tell them about high potassium foods?
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Assessments to make
Teaching to include:
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Drugs include ◦Antibiotics Fosfomycin (Monurol) Quinolones : cinoxacin, nalidixic acid, norfloxacin
Methenamine madelate Nitrofurantoin
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Fosfomycin (Monurol)◦ Inhibits bacterial cell wall synthesis◦ Reduces adherence of bacteria to epithelial
cells of urinary tract◦ Single dose therapy
SE to expect: ◦ nausea, diarrhea, abdominal cramps, flatulence
SE to report: ◦ perineal burning, dysuria
Indicates UTI is not responding to treatment Drug interactions
◦ Drugs such as metoclopramide that increase GI motility
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Norfloxacin (Noroxin) has wide range of activity against gram negative and gram positive bacteria Expensive Reserve for resistant/recurrent infections
SE to report◦ Hematuria as crystals can form in urinary tract◦ HA, tinnitus, dizziness, tingling sensations,
photophobia
Various drug interactions can occur◦ Assess client’s current drug therapy, monograph
of quinolone being used
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◦ Converts to ammonia and formaldehyde in acidic urine◦ Used in clients susceptible to chronic, recurrent UTIs◦ Preexisting infections treated with antibiotics
Implementation ◦ DO NOT crush the tablets◦ pH testing of urine: report over 5.5
SE to expect ◦ N/V, belching
SE to report◦ Hives, pruritus, rash◦ Bladder irritation, dysuria, frequency
Drug interactions◦ Acetazolamide, sodium bicarbonate◦ Sulfamethizole
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◦ Interferes with several bacterial enzyme systems◦ Effective only in the urinary tract
SE to expect: ◦ N/V, anorexia, urine discoloration
SE to report:◦ Dyspnea, chills, fever, erythematous rash, pruritus◦ Peripheral neuropathies ◦ Second infection
Drug interactions◦ Magnesium containing products can decrease
absorption
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Bethanecole chloride (Urecholine) Neostigmine (Prostigmin) Oxybutynin chloride (Ditropan) Phenazopyridine (Pyridium) Tolterodine (Detrol)
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◦ Parasympathetic nerve stimulant◦ Causes contraction of detrusor urinae muscle
Results in urination May also stimulate gastric motility Can increase gastric tone Can restore impaired rhythmic peristalsis
SE to expect◦ Flushing of skin, HA
SE to report◦ N/V, sweating, colicky pain, abdominal cramps◦ Diarrhea, belching, involuntary defecation
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◦ Anticholinesterase agent◦ Binds to cholinesterase
Prevents destruction of acetylcholine Effects are: miosis; increased tone of
intestinal, skeletal, and bladder muscles Bradycardia; stimulation of secretions of
salivary and sweat glands Constriction of bronchi and ureters
Neostigmine used to prevent and treat postoperative distension and urinary retention◦ Assess for pregnancy, intestinal or urinary
obstruction, peritonitis◦ Assess coronary status
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Antispasmodic agent—acts directly on smooth muscle of the bladder◦Delays initial urge to void◦Do not use if glaucoma, myasthenia
gravis, ulcerative colitis, obstructive uropathy
SE to expect◦Dry mouth, urinary hesitance, retention◦Constipation, bloating◦Blurred vision Report any SE that are intensified
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Produces local anesthetic effect in urinary tract
Acts about 30 min. after administration Used to relieve burning, pain, urgency,
frequency in UTI Reduces bladder spasms
SE to expect◦ Reddish-orange urine color
SE to report◦ Yellow sclera or skin
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Muscarinic receptor antagonists Inhibit muscarinic action of acetylcholine on
bladder smooth muscle Used to treat overactive bladder Do not use if glaucoma, ulcerative colitis,
obstructive uropathy S/E to expect
◦ Dry mouth◦ Urinary hesitance, retention◦ Constipation, bloating◦ Blurred vision◦ Report if the effects intensified
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Objective 18: Discuss patient education guidelines for drugs that affect the urinary system
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Objective 19: identify at least one nursing diagnosis that may be applicable for clients receiving diuretic therapy under the guidance of the instructor
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