Добавил:
kiopkiopkiop18@yandex.ru t.me/Prokururor I Вовсе не секретарь, но почту проверяю Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:

Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_2920_Библиотеки_им_академика_М_И_Перельмана

.pdf
Скачиваний:
0
Добавлен:
15.09.2026
Размер:
11 Мб
Скачать
☆
Hematuria may result from one of two mech-
https://t.me/medicina_free
anisms: rupture or perforation of vessels in the renal system or urinary tract, or impaired glomerular filtration, which allows RBCs to seep into the urine. The color of the bloody urine provides a clue to the source of the bleeding. Generally, dark or brownish blood indicates re­nal or upper urinary tract bleeding, whereas bright red blood indicates lower urinary tract bleeding.
Although hematuria usually results from re­nal and urinary tract disorders, it may also re­sult from certain GI, prostate, vaginal, or coagu­lation disorders or from the effects of certain drugs. Invasive therapy and diagnostic tests that involve manipulative instrumentation of the re­nal and urologic systems may also cause hema­turia. Nonpathologic hematuria may result from fever and hypercatabolic states. Transient hematuria may follow strenuous exercise. (See Hematuria: Causes and associated findings, pages 362 to 365.)
H
ISTORY AND PHYSICAL EXAMINATION
After detecting hematuria, take a pertinent health history. If hematuria is macroscopic, ask the patient when he first noticed blood in his urine. Does it vary in severity between void­ings? Is it worse at the beginning, middle, or end of urination? Has it occurred before? Is the patient passing any clots? To rule out artifactual hematuria, ask about bleeding hemorrhoids or the onset of menses, if appropriate. Ask if pain or burning accompanies the episodes of hema­turia.
Ask about recent abdominal or flank trauma. Has the patient been exercising strenuously? Note a history of renal, urinary, prostatic, or co­agulation disorders. Then obtain a drug history, noting the use of anticoagulants or aspirin.
Begin the physical examination by palpating and percussing the abdomen and flanks. Next, percuss the costovertebral angle (CVA) to elicit tenderness. Check the urinary meatus for bleed­ing or other abnormalities. Using a chemical reagent strip, test a urine specimen for protein. A vaginal or digital rectal examination may be necessary.
M
EDICAL CAUSES
◆ Appendicitis. About 15% of patients with ap-
pendicitis have either microscopic or macro­scopic hematuria accompanied by bladder ten­derness, dysuria, and urinary urgency. More
HEMATURIA
361
Confirming hematuria
If the patient’s urine appears blood tinged, be sure to rule out pseudohematuria, red or pink urine caused by urinary pigments. First, carefully observe the urine specimen. If it contains a red sediment, it’s probably true hematuria.
Then check the patient’s history for use of drugs associated with pseudohematuria, in­cluding rifampin, chlorzoxazone, phenazopyridine, phenothiazines, doxoru­bicin, phenytoin, and laxatives containing phenolphthalein.
Ask about the patient’s intake of beets, berries, or foods with red dyes that may col­or the urine red. Be aware that porphyrin­uria and excess urate excretion can also cause pseudohematuria.
Finally, test the urine using a chemical reagent strip. This test can confirm even mi­croscopic hematuria and can also estimate the amount of blood present.
typical findings include constant right-lower­quadrant pain (especially over McBurney’s point), nausea and vomiting, anorexia, abdomi­nal rigidity, rebound tenderness, constipation, tachycardia, and low-grade fever.
◆ Bladder cancer. A primary cause of gross
hematuria in men, bladder cancer may also pro­duce pain in the bladder, rectum, pelvis, flank, back, or leg. Other common features are noc­turia, dysuria, urinary frequency and urgency, vomiting, diarrhea, and insomnia.
◆ Bladder trauma. A characteristic finding in
traumatic rupture or perforation of the bladder, gross hematuria is typically accompanied by low­er abdominal pain. The patient may also develop anuria despite a strong urge to void; swelling of the scrotum, buttocks, or perineum; and signs of shock, such as tachycardia and hypotension.
◆ Calculi. Both bladder and renal calculi pro-
duce hematuria, which may be associated with signs of urinary tract infection, such as dysuria and urinary frequency and urgency. Bladder cal­culi may also cause gross hematuria, referred pain to the lower back or penile or vulvar area and, occasionally, bladder distention.
Renal calculi may produce microscopic or
gross hematuria. The cardinal symptom, though, is colicky pain that travels from the CVA to the flank, suprapubic region, and external
(Text continues on page 366.)
362 HEMATURIA
https://t.me/medicina_free
SIGNS & SYMPTOMS
Hematuria: Causes and associated findings
Major associated signs and symptoms
Common causes
Appendicitis
Bladder cancer
Bladder trauma
Calculi (bladder)
Calculi (renal)
Coagulation disorders
Cortical necrosis (acute)
Cystitis (bacterial)
Cystitis (chronic interstitial)
Cystitis (tubercular)
Cystitis (viral)
Diverticulitis
Endocarditis (subacute infective)
Abdominal
distention
Abdominal pain
Anuria
Bladder distention
Blood pressure
increase
Bowel sounds,
hypoactive
•
••
••
•• •
••
•
Colicky pain
Costovertebral angle
tenderness
Dysuria
Edema, generalized
••
•
•
•• •
••
•
•
••
Edema of the legs
Fever
••
•
Glomerulonephritis (acute)
Glomerulonephritis (chronic)
Nephritis (acute interstitial)
Nephritis (chronic interstitial)
Nephropathy (obstructive)
•• • • •
••
••
•
••
•
•
Flank mass
https://t.me/medicina_free
Flank pain
Lumbar pain
Murmurs
Nausea
Nocturia
Oliguria
Perineal pain
Polyarthralgia
Polyuria
Proteinuria
Purpura
Rash
Urethral discharge
Urinary frequency
HEMATURIA 363
Urinary hesitancy
Urinary stream,
diminished
Urinary urgency
Vomiting
•••
••
•
•
•••
••
•• • ••
•
•
••
•
••
••
•••
•••
•
••
••
•
•
••• • •
•
•••
••
•
(continued)
364 HEMATURIA
https://t.me/medicina_free
Hematuria: Causes and associated findings (continued)
Major associated signs and symptoms
Common causes
Polycystic kidney disease
Prostatic hyperplasia (benign)
Prostatitis (acute)
Prostatitis (chronic)
Pyelonephritis (acute)
Renal cancer
Renal infarction
Renal papillary necrosis (acute)
Renal trauma
Renal tuberculosis
Renal vein thrombosis
Abdominal
distention
Abdominal pain
Anuria
Bladder distention
Blood pressure
increase
Bowel sounds,
hypoactive
Colicky pain
Costovertebral angle
tenderness
Dysuria
Edema, generalized
Edema of the legs
Fever
••
•
•
•
•••
••
•••••
•
•••
•
•• • • • •
•• •
••
•
•
•
•
•
••••
Schistosomiasis
Sickle cell anemia
Systemic lupus erythematosus
Urethral trauma
Vaginitis
Vasculitis
•
•
•
•
•
••
Flank mass
https://t.me/medicina_free
Flank pain
Lumbar pain
Murmurs
Nausea
Nocturia
Oliguria
Perineal pain
Polyarthralgia
Polyuria
Proteinuria
Purpura
Rash
Urethral discharge
Urinary frequency
HEMATURIA 365
Urinary hesitancy
Urinary stream,
diminished
Urinary urgency
Vomiting
•
••••
•
•
•••
•• •• • ••
••••
••• ••••
•• • •
••
•
•• •
•
••
•
•
•
•
•
••
•
•
•
•
•
••
•
•
•
•
•
•
•
•
••
366 HEMATURIA
https://t.me/medicina_free
genitalia when a calculus is passed. The pain may be excruciating at its peak. Other signs and symptoms may include nausea and vomiting, restlessness, fever, chills, abdominal distention and, possibly, decreased bowel sounds.
◆ Coagulation disorders. Macroscopic hema-
turia is commonly the first sign of hemorrhage in coagulation disorders, such as thrombocy­topenia or disseminated intravascular coagula­tion. Among other features are epistaxis, purpu­ra (petechiae and ecchymosis), and signs of GI bleeding.
◆ Cortical necrosis (acute). Accompanying
gross hematuria in this renal disorder are in­tense flank pain, anuria, leukocytosis, and fever.
◆ Cystitis. Hematuria is a telling sign in all
types of cystitis. Bacterial cystitis usually pro­duces macroscopic hematuria with urinary ur­gency and frequency, dysuria, nocturia, and tenesmus. The patient complains of perineal and lumbar pain, suprapubic discomfort, and fa­tigue and occasionally has a low-grade fever.
More common in women, chronic interstitial
cystitis occasionally causes gross hematuria. As­sociated features include urinary frequency, dy­suria, nocturia, and tenesmus. Both microscopic and macroscopic hematuria may occur in tuber- cular cystitis, which may also cause urinary ur­gency and frequency, dysuria, tenesmus, flank pain, fatigue, and anorexia. Viral cystitis usually produces hematuria, urinary urgency and fre­quency, dysuria, nocturia, tenesmus, and fever.
◆ Diverticulitis. When this disorder involves
the bladder, it usually causes microscopic hematuria, urinary frequency and urgency, dy­suria, and nocturia. Characteristic findings in­clude left-lower-quadrant pain, abdominal ten­derness, constipation or diarrhea and, occasionally, a palpable, firm, fixed, and tender abdominal mass. The patient may also develop mild nausea, flatulence, and a low-grade fever.
◆ Endocarditis (subacute infective). Occa-
sionally, this disorder produces embolization, resulting in renal infarction and microscopic or gross hematuria. Common related findings are constant fever, chills, night sweats, fatigue, pal­lor, anorexia, weight loss, polyarthralgia, pe­techiae, flank pain, severe back pain, stiff neck, cardiac murmurs, tachycardia, and splenomegaly.
◆ Glomerulonephritis. Acute glomerulonephri-
tis usually begins with gross hematuria that ta-
pers off to microscopic hematuria and RBC casts, which may persist for months. It may also produce oliguria or anuria, proteinuria, mild
fever, fatigue, flank and abdominal pain, gener­alized edema, increased blood pressure, nau­sea, vomiting, and signs of lung congestion, such as crackles and a productive cough.
Chronic glomerulonephritis usually causes mi-
croscopic hematuria accompanied by protein­uria, generalized edema, and increased blood pressure. Signs and symptoms of uremia may also occur in advanced disease.
◆ Nephritis (interstitial). Typically, this infec-
tion causes microscopic hematuria. However, some patients with acute interstitial nephritis may develop gross hematuria. Other findings are fever, maculopapular rash, and oliguria or anuria. In chronic interstitial nephritis, the pa­tient has dilute—almost colorless—urine that may be accompanied by polyuria and increased blood pressure.
◆ Nephropathy (obstructive). This disorder
may cause microscopic or macroscopic hema­turia, but urine is rarely grossly bloody. The pa­tient may report colicky flank and abdominal pain, CVA tenderness, and anuria or oliguria that alternates with polyuria.
◆ Polycystic kidney disease. This hereditary
disorder may cause recurrent microscopic or gross hematuria. It commonly produces no symptoms before age 40 but may cause in­creased blood pressure, polyuria, dull flank pain, and signs of urinary tract infection, such as dy­suria and urinary frequency and urgency. Later, the patient develops a swollen, tender abdomen and lumbar pain that’s aggravated by exertion and relieved by lying down. He may also have proteinuria and colicky abdominal pain from the ureteral passage of clots or calculi.
◆ Prostatic hyperplasia (benign). About 20%
of patients with an enlarged prostate have macroscopic hematuria, usually when a signifi­cant obstruction is present. The hematuria is usually preceded by diminished urinary stream, tenesmus, and a feeling of incomplete voiding. It may be accompanied by urinary hesitancy, frequency, and incontinence; nocturia; perineal pain; and constipation. Inspection reveals a midline mass representing the distended blad­der; rectal palpation reveals an enlarged prostate.
◆ Prostatitis. Whether acute or chronic, pro-
statitis may cause macroscopic hematuria, usu­ally at the end of urination. It may also produce urinary frequency and urgency and dysuria fol­lowed by visible bladder distention.
Acute prostatitis also produces fatigue,
malaise, myalgia, polyarthralgia, fever with
HEMATURIA
https://t.me/medicina_free
367
chills, nausea, vomiting, perineal and low back pain, and decreased libido. Rectal palpation re­veals a tender, swollen, boggy, firm prostate.
Chronic prostatitis commonly follows an acute
attack. It may cause persistent urethral dis­charge, dull perineal pain, ejaculatory pain, and decreased libido.
◆ Pyelonephritis (acute). This infection typi-
cally produces microscopic or macroscopic hematuria that progresses to gross hematuria. After the infection resolves, microscopic hema­turia may persist for a few months. Related signs and symptoms include persistent high fever, unilateral or bilateral flank pain, CVA ten­derness, shaking chills, weakness, fatigue, dy­suria, urinary frequency and urgency, nocturia, and tenesmus. The patient may also exhibit nausea, vomiting, anorexia, and signs of para­lytic ileus, such as hypoactive or absent bowel sounds and abdominal distention.
◆ Renal cancer. The classic triad of signs and
symptoms includes gross hematuria; dull, aching flank pain; and a smooth, firm, palpable flank mass. Colicky pain may accompany the passage of clots. Other findings include fever, CVA tenderness, and increased blood pressure. In advanced disease, the patient may develop weight loss, nausea and vomiting, and leg ede­ma with varicoceles.
◆ Renal infarction. Typically, this disorder pro-
duces gross hematuria. The patient may complain of constant, severe flank and upper abdominal pain accompanied by CVA tenderness, anorexia, and nausea and vomiting. Other findings include oliguria or anuria, proteinuria, hypoactive bowel sounds and, a day or two after the infarction, fever and increased blood pressure.
◆ Renal papillary necrosis (acute). This dis-
order usually produces gross hematuria, which may be accompanied by intense flank pain, CVA tenderness, abdominal rigidity and colicky pain, oliguria or anuria, pyuria, fever, chills, vomiting, and hypoactive bowel sounds. Arthralgia and hypertension are common.
◆ Renal trauma. About 80% of patients with
renal trauma have microscopic or gross hema­turia. Accompanying signs and symptoms may include flank pain, a palpable flank mass, olig­uria, hematoma or ecchymosis over the upper abdomen or flank, nausea and vomiting, and hypoactive bowel sounds. Severe trauma may precipitate signs of shock, such as tachycardia and hypotension.
◆ Renal tuberculosis. Gross hematuria is of-
ten the first sign of this disorder. It may be ac-
companied by urinary frequency, dysuria, pyuria, tenesmus, colicky abdominal pain, lum­bar pain, and proteinuria.
◆ Renal vein thrombosis. Gross hematuria
usually occurs in this type of thrombosis. In an abrupt venous obstruction, the patient experi­ences severe flank and lumbar pain as well as epigastric and CVA tenderness. Other features include fever, pallor, proteinuria, peripheral edema and, when the obstruction is bilateral, oliguria or anuria and other uremic signs. The kidneys are easily palpable. Gradual venous ob­struction causes signs of nephrotic syndrome, proteinuria and, occasionally, peripheral edema.
◆ Schistosomiasis. This infection usually
causes intermittent hematuria at the end of uri­nation. It may be accompanied by dysuria, col­icky renal and bladder pain, and palpable lower abdominal masses.
◆ Sickle cell anemia. In this hereditary disor-
der, gross hematuria may result from conges­tion of the renal papillae. Associated signs and symptoms may include pallor, dehydration, chronic fatigue, polyarthralgia, leg ulcers, dysp­nea, chest pain, impaired growth and develop­ment, hepatomegaly and, possibly, jaundice. Auscultation reveals tachycardia and systolic and diastolic murmurs.
◆ Systemic lupus erythematosus. Gross
hematuria and proteinuria may occur when this disorder involves the kidneys. Cardinal features include nondeforming joint pain and stiffness, a butterfly rash, photosensitivity, Raynaud’s phe­nomenon, seizures or psychoses, recurrent fever, lymphadenopathy, oral or nasopharyngeal ulcers, anorexia, and weight loss.
◆ Urethral trauma. Hematuria may occur ini-
tially, possibly with blood at the urinary meatus, local pain, and penile or vulvar ecchymosis.
◆ Vaginitis. When this infection spreads to the
urinary tract, it may produce macroscopic hematuria. Related signs and symptoms may in­clude urinary frequency and urgency, dysuria, nocturia, perineal pain, pruritus, and a malodor­ous vaginal discharge.
◆ Vasculitis. Hematuria is usually microscopic
in this disorder. Associated signs and symptoms include malaise, myalgia, polyarthralgia, fever, increased blood pressure, pallor and, occasion­ally, anuria. Other features, such as urticaria and purpura, may reflect the etiology of vasculitis.
O
THER CAUSES
◆ Diagnostic tests. Renal biopsy is the diag-
nostic test most often associated with hematuria.
368 HEMIANOPSIA
https://t.me/medicina_free
This sign may also result from biopsy or manip­ulative instrumentation of the urinary tract, as in cystoscopy.
◆ Drugs. Drugs that commonly cause hema-
turia are anticoagulants, aspirin (toxicity), anal­gesics, cyclophosphamide, metyrosine, peni­cillin, rifampin, and thiabendazole.
HERB ALERT When taken with an antico-
agulant, herbal medicines such as garlic and ginkgo biloba can cause excessive bleeding and hematuria.
◆ Treatments. Any therapy that involves ma-
nipulative instrumentation of the urinary tract, such as transurethral prostatectomy, may cause microscopic or macroscopic hematuria. After a kidney transplant, a patient may experience hematuria with or without clots, which may re­quire indwelling urinary catheter irrigation.
S
PECIAL CONSIDERATIONS
Because hematuria may frighten and upset the patient, be sure to provide emotional support. Check his vital signs at least every 4 hours and monitor intake and output, including the amount and pattern of hematuria. If the patient has an indwelling urinary catheter in place, en­sure its patency and irrigate it if necessary to re­move clots and tissue that may impede urine drainage. Administer prescribed analgesics, and enforce bed rest as indicated. Prepare the pa­tient for diagnostic tests, such as blood and urine studies, cystoscopy, and renal X-rays or biopsy.
P
EDIATRIC POINTERS
Many of the causes described above also pro­duce hematuria in children. However, cy­clophosphamide is more likely to cause hema­turia in children than in adults.
Common causes of hematuria that chiefly af­fect children include congenital anomalies, such as obstructive uropathy and renal dysplasia; birth trauma; hematologic disorders, such as vi­tamin K deficiency, hemophilia, and hemolytic­uremic syndrome; certain neoplasms, such as Wilms’ tumor, bladder cancer, and rhabdomyo­sarcoma; allergies; and foreign bodies in the urinary tract. Artifactual hematuria may result from recent circumcision.
G
ERIATRIC POINTERS
Evaluation of hematuria in elderly patients should include a urine culture, excretory urog­raphy or sonography, and consultation with a urologist.
P
ATIENT COUNSELING
Teach the patient how to collect serial urine specimens using the three-glass technique. This technique helps determine whether hematuria marks the beginning, end, or entire course of urination.
Hemianopsia
Hemianopsia is loss of vision in one-half the normal visual field (usually the right or left half) of one or both eyes. However, if the visual field defects are identical in both eyes but affect less than half the field of vision in each eye (incom­plete homonymous hemianopsia), the lesion may be in the occipital lobe; otherwise, it proba­bly involves the parietal or temporal lobe. (See Recognizing types of hemianopsia.)
Hemianopsia is caused by a lesion affecting the optic chiasm, the optic tract, or the optic ra­diation. Defects in visual perception due to cerebral lesions are usually associated with im­paired color vision.
H
ISTORY AND PHYSICAL EXAMINATION
Suspect a visual field defect if the patient seems startled when you approach him from one side or if he fails to see objects placed directly in front of him. To help determine the type of de­fect, compare the patient’s visual fields with your own—assuming that yours are normal. First, ask the patient to cover his right eye while you cover your left eye. Then move a pen or similarly shaped object from the periphery of his (and your) uncovered eye into his field of vision. Ask the patient to indicate when he first sees the object. Does he see it at the same time you do? After you do? Repeat this test in each quad­rant of both eyes. Then, for each eye, plot the defect by shading the area of a circle that corre­sponds to the area of vision loss.
Next, evaluate the patient’s level of con­sciousness (LOC), take his vital signs, and check his pupillary reaction and motor response. Ask if he has recently experienced headache, dysarthria, or seizures. Does he have ptosis or facial or extremity weakness? Hallucinations or loss of color vision? When did his neurologic symptoms start? Obtain a medical history, not­ing especially eye disorders, hypertension, dia­betes mellitus, and recent head trauma.
HEMIANOPSIA 369
https://t.me/medicina_free
Recognizing types of hemianopsia
Lesions of the optic pathways cause visual field defects. The lesion’s site determines the type of defect. For example, a lesion of the optic chiasm involving only those fibers that cross over to the opposite side causes bitemporal hemianopsia, vision loss in the temporal half of each field. How­ever, a lesion of the optic tract or a complete lesion of the optic radiation produces vision loss in the same half of each field—either left or right homonymous hemianopsia.
LEFT VISUAL FIELD RIGHT VISUAL FIELD
Bitemporal
hemianopsia
Right homonymous
hemianopsia
Optic tract
Optic chiasm
Optic radiation
BRAIN
Left homonymous
hemianopsia
370 HEMOPTYSIS
https://t.me/medicina_free
M
EDICAL CAUSES
◆ Carotid artery aneurysm. An aneurysm in
the internal carotid artery can cause contralat­eral or bilateral defects in the visual fields. It can also cause hemiplegia, decreased LOC, headache, aphasia, behavior disturbances, and unilateral hypoesthesia.
◆ Occipital lobe lesion. The most common
symptoms arising from a lesion of one occipital lobe are incomplete homonymous hemianopsia, scotomas, and impaired color vision. The pa­tient may also experience visual hallucinations: flashes of light or color, or visions of objects, people, animals, or geometric forms. These may appear in the defective field or may move to­ward it from the intact field.
◆ Parietal lobe lesion. This disorder produces
homonymous hemianopsia and sensory deficits, such as an inability to perceive body position or passive movement or to localize tactile, ther­mal, or vibratory stimuli. It may also cause apraxia and visual or tactile agnosia.
◆ Pituitary tumor. A tumor that compresses
nerve fibers supplying the nasal half of both reti­nas causes complete or partial bitemporal hemianopsia that first occurs in the upper visual fields but later can progress to blindness. Relat­ed findings include blurred vision, diplopia, headache, and (rarely) somnolence, hypother­mia, and seizures.
◆ Stroke. Hemianopsia can result when a he-
morrhagic, thrombotic, or embolic stroke affects any part of the optic pathway. Associated signs and symptoms vary according to the location and size of the stroke but may include de­creased LOC; intellectual deficits, such as mem­ory loss and poor judgment; personality changes; emotional lability; headache; and seizures. The patient may also develop con­tralateral hemiplegia, dysarthria, dysphagia, ataxia, unilateral sensory loss, apraxia, agnosia, aphasia, blurred vision, decreased visual acuity, and diplopia as well as urine retention or incon­tinence, constipation, and vomiting.
S
PECIAL CONSIDERATIONS
If the patient’s visual field defect is significant, further visual field testing, such as perimetry or a tangent screen examination, may be indicated.
To avoid startling the patient, approach from the unaffected side and position his bed so that his unaffected side faces the door. If he’s ambu­latory, remove objects that could cause falls, and alert him to other possible hazards. Place his clock and other objects within his field of
vision, and avoid putting dangerous objects (such as hot dishes) where he can’t see them.
P
EDIATRIC POINTERS
A brain tumor is the most common cause of hemianopsia in children. To help detect this sign, look for nonverbal clues, such as the child reaching for a toy but missing it. To help the child compensate for hemianopsia, place ob­jects within his visual field; teach his parents to do this as well.
P
ATIENT COUNSELING
Explain to the patient the extent of his defect so that he can learn to compensate for it. Advise him to scan his surroundings frequently, turning his head in the direction of the defective visual field so that he can directly view objects he would normally notice only peripherally.
Hemoptysis
Frightening to the patient and often ominous, hemoptysis is the expectoration of blood or bloody sputum from the lungs or tracheo­bronchial tree. It’s sometimes confused with bleeding from the mouth, throat, nasopharynx, or GI tract. (See Identifying hemoptysis.) Expec­toration of 200 ml of blood in a single episode suggests severe bleeding; expectoration of 400 ml in 3 hours or more than 600 ml in 16 hours signals a life-threatening crisis.
Hemoptysis usually results from chronic bronchitis, lung cancer, or bronchiectasis. How­ever, it may also result from inflammatory, in­fectious, cardiovascular, or coagulation disor­ders and, rarely, from a ruptured aortic aneurysm. In up to 15% of patients, the cause is unknown. The most common causes of massive hemoptysis are lung cancer, bronchiectasis, ac­tive tuberculosis, and cavitary pulmonary dis­ease from necrotic infections or tuberculosis.
A number of pathophysiologic processes can cause hemoptysis. (See What happens in hemop- tysis, page 372.)
EMERGENCY INTERVENTIONS If the pa-
tient coughs up copious amounts of blood, endotracheal intubation may be required. Suction frequently to remove blood. Lavage may be neces­sary to loosen tenacious secretions or clots. Mas­sive hemoptysis can cause airway obstruction and asphyxiation. Insert an I.V. catheter to allow fluid replacement, drug administration, and blood trans­fusions if needed. An emergency bronchoscopy