Download Confused, Disoriented Man With Cough and Cold

Confused, Disoriented Man With Cough and Cold Symptoms
Published on Patient Care Online (http://www.patientcareonline.com)
Confused, Disoriented Man With Cough and Cold Symptoms
June 01, 2008 | HIV AIDS [1], Infection [2], Obesity [3]
By David M. Nestler, MD [4]
The family of a 49-year-old Chinese man brings him to the hospital after he becomes confused and
disoriented. For about a week, the patient has had cough, cold symptoms, dizziness, and occasional
vomiting.
The Case: The family of a 49-year-old Chinese man brings him to the hospital
after he becomes confused and disoriented. For about a week, the patient has had cough, cold
symptoms, dizziness, and occasional vomiting. He is a recent immigrant and speaks no English. The
examination questions are translated into Cantonese by a relative and by a translator phone.
The patient is oriented to person only but follows commands. Temperature is 38.9°C (102.1°F); blood
pressure, 136/73 mm Hg; heart rate, 81 beats per minute; respiration rate, 22 breaths per minute;
and oxygen saturation, 97% on room air. Pulmonary and cardiac findings are unremarkable. The
abdomen is soft and nontender. There is no peripheral edema. Neurological findings are nonfocal. A
chest radiograph obtained as part of a fever workup is shown.
To which diagnosis do the radiographic and clinical findings point?
•
•
•
•
•
Legionella pneumonia
Lymphangitic spread of cancer
Sarcoidosis
Miliary tuberculosis
Pneumoconiosis
(Answer and discussion begin on next page.)
Answer: Miliary tuberculosis
Discussion: This chest radiograph shows a miliary pattern, which may occur during post-primary
tuberculosis (TB). At this stage of the disease, hematogenous spread to the pulmonary parenchyma
results in 1- to 2-mm nodules that resemble millet seeds (shown here) throughout both lungs. In the
past, the term "miliary" was more of a radiographic description; it now refers to all cases of
disseminated hematogenous tuberculosis.1
PULMONARY TB: A BRIEF OVERVIEW
TB is the second leading infectious cause of death in the world, with 2 million deaths per year.2 In
2005, the overall number of TB cases had declined in the United States. However, the number of TB
Page 1 of 4
Confused, Disoriented Man With Cough and Cold Symptoms
Published on Patient Care Online (http://www.patientcareonline.com)
cases in foreign-born persons continues to rise and is currently 8.7 times that in persons born in the
United States.3 About half of the foreign-born persons with TB are from 5 countries: Mexico, the
Philippines, Vietnam, India, and China.2 Studies suggest that these cases represent reactivation of
latent disease,4 which is most likely what occurred in this patient.
Humans are the only reservoir for Mycobacterium
tuberculosis. This intracellular aerobic bacillus is primarily transmitted via inhalation. Infected
persons expel infected droplets when coughing or sneezing. Once inhaled, the infected droplets can
travel to distal alveoli because of their small size. Inhaled mycobacteria-containing droplets are
usually engulfed by alveolar macrophages and destroyed. Mycobacteria that survive are transported
to regional lymph nodes, where cell-mediated immunity is activated to contain the infection. At this
point, the disease enters the latent phase, in which the patient is asymptomatic and a skin test is
positive. Hematogenous spread may occur if the person is immunocompromised or overwhelmed by
the infection.
Pulmonary TB causes few early symptoms. Physical examination rarely leads to the diagnosis; the
history is often more helpful. Symptoms can vary widely but are most commonly cough followed by
weight loss, fatigue, fever, night sweats, and chills. Altered mental status is an uncommon
presenting symptom unless the patient has severe hypoxemia. About one-fourth of patients
complain of hemoptysis.1 Only one-third of patients with pulmonary TB present with a pulmonary
chief complaint.5 Therefore, consider screening patients with any combination of these symptoms for
tuberculosis.
Persons at risk for tuberculosis include3-5:
•
•
•
•
•
•
•
•
•
Those with HIV infection.
Immigrants from Asia, Africa, and Latin America.
Members of medically underserved, low-income populations.
Elderly persons.
Residents of long-term-care facilities (eg, nursing homes, correctional facilities).
Injection drug users.
Members of groups identified locally (eg, homeless persons, migrant farmworkers).
Persons who have occupational exposure.
Close contacts of a known case of TB.
Page 2 of 4
Confused, Disoriented Man With Cough and Cold Symptoms
Published on Patient Care Online (http://www.patientcareonline.com)
Page 3 of 4
Confused, Disoriented Man With Cough and Cold Symptoms
Published on Patient Care Online (http://www.patientcareonline.com)
OUTCOME OF THIS CASE
Treatment with isoniazid, rifampin, ethambutol, and pyrazinamide for presumed TB was started, and
the patient was isolated. His temperature and mental status returned to normal over the next few
days. Cultures of sputum and cerebrospinal fluid were positive for M tuberculosis that was sensitive
to all medications. The patient currently takes isoniazid and rifampin on an outpatient basis and
continues to do well.
DIFFERENTIAL DIAGNOSIS
The differential diagnosis of a miliary pattern on a chest radiograph is broad (Table).1
Nontuberculous causes may include any granulomatous or neoplastic disease. Small,
well-demarcated lesions usually represent thickening of the interstitium of the lung. Lesions that are
the same size are generally granulomas.
Legionnaires disease may mimic miliary TB in immunocompromised patients.
Lymphangitic spread of cancer frequently appears as diffuse, small lesions that differ in size and
shape. The most common neoplasms of origin include cancer of the breast, colon, and kidney and
lymphomas. This radiographic pattern represents tumor microembolism. Patients may present with
severe dyspnea, hypoxia, or fever.
Most patients with sarcoidosis have pulmonary involvement with or without lymphadenopathy.
Sarcoidosis can also affect other organ systems and may manifest as erythema nodosum,
polyarthralgia, or uveitis. The pulmonary lesions are widespread and nodular, involve the interlobular
septum, and may form larger masses.6
Pneumoconiosis from exposure to coal or silica can cause miliary radiographic patterns.
Hypersensitivity pneumonitis may occur after a variety of organic or chemical exposures.
References: REFERENCES:
1. Sharma SK, Mohan A, Sharma A, Mitra DK. Miliary tuberculosis: new insights into an old disease.
Lancet Infect Dis. 2005;5:415-430.
2. Center for Disease Control and Prevention. Trends in tuberculosis—United States, 2005. MMWR.
2006;55:305-308.
3. Mert A, Ozaras R. Clinical importance of miliary pattern in the chest X-ray of a patient with fever of
unknown origin. Intern Med. 2005;44:161.
4. Cain KP, Haley CA, Armstrong LR, et al. Tuberculosis among foreign-born persons in the United
States: achieving tuberculosis elimination. Am J Respir Crit Care Med. 2007;175:75-79.
5. Sokolove PE, Rossman L, Cohen SH. The emergency department presentation of patients with
active pulmonary tuberculosis. Acad Emerg Med. 2000;7:1056-1060.
6. Iannuzzi MC, Rybicki BA, Teirstein AS. Sarcoidosis. N Engl J Med. 2007;357:2153-2165.
Source URL:
http://www.patientcareonline.com/articles/confused-disoriented-man-cough-and-cold-symptoms
Links:
[1] http://www.patientcareonline.com/hiv-aids
[2] http://www.patientcareonline.com/infection
[3] http://www.patientcareonline.com/obesity
[4] http://www.patientcareonline.com/authors/david-m-nestler-md
Page 4 of 4