Iliana Samara Hurtado Rendon

Comparing Outcomes of HIV versus Non-HIV Patients Requiring Mechanical Ventilation

Background Mechanical ventilation (MV) is a predictor of mortality in patients infected with human immunodeficiency virus (HIV) in the intensive care unit (ICU). Patients with HIV-infections are admitted to the ICU for a variety of reasons that frequently require intubation. While survival rates for HIV-infected patients continue to improve, ICU admission rates have remained consistent. Methods To observe the consequences of MV in HIV-infected patients, we conducted a retrospective chart review on patients with HIV (n=55) vs. matched HIV-negative patients (n=55) who required MV over a one-year period and compared the groups for differences in outcome and complications. Results The HIV group had twice the number of deaths (44% vs. 22%, all-cause mortality) (P=0.01). Among the HIV-positive group, 5 of 55 patients required tracheostomy and prolonged MV, compared to 15 of 55 in the control group (9% and 27%, respectively). Successful extubation was virtually identical (47% MV vs. 50% control). Ventilator-associated pneumonia (VAP) was significantly higher among HIV-positive cases (39 of 55 HIV vs. 14 of 55 non-HIV) (P=0.05). Regression analysis revealed that hypotension, hypoalbuminemia, and fever predicted a poorer outcome. Low CD4 cell counts were strongly associated with mortality. Conclusion HIV-infected patients requiring MV have significantly higher mortality and VAP rates than HIV-negative patients. Since VAP is associated with a poor prognosis, discovering ways to prevent it in the HIV-infected patient may improve outcome.

Recurrent Negative Pressure Pulmonary Edema

An African-American man, aged 34 years, underwent an elective uncomplicated right wrist laceration repair while under general anesthesia. Following extubation, the patient developed hypoxemia, tachypnea, shortness of breath, pulmonary rales, frothy sputum, decreased oxygen saturation, and evidence of upper airway obstruction. Chest radiograph showed pulmonary edema. The patient was diagnosed with post-extubation pulmonary edema (aka. negative pressure pulmonary edema [NPPE]) and was treated with intravenous furosemide and oxygen therapy; he improved remarkably within a few hours. Once stabilized, the patient described a similar episode 10 years earlier following surgery for multiple gunshot wounds. Negative pressure pulmonary edema following tracheal extubation is an uncommon (0.1%) and life-threatening complication of patients undergoing endotracheal intubation and general anesthesia for surgical procedures. The common pattern in these cases is the occurrence of an episode of airway obstruction upon emergence from general anesthesia, usually caused by laryngospasm. Patients who are predisposed to airway obstruction may have an increased risk of airway complications upon extubation after general anesthesia. Prevention and early relief of upper airway obstruction should decrease incidence. Recurrent NPPE has not been previously described in the literature. Herein, we describe the first case of recurrent NPPE in the same patient following extubation.

Outcome of Nicotine Replacement Therapy in Patients Admitted to ICU: A Randomized Controlled Double-Blind Prospective Pilot Study

BACKGROUND: The effect of nicotine withdrawal in smokers admitted to the ICU is not well understood, so the role of nicotine replacement therapy (NRT) in those patients is controversial. OBJECTIVE: To determine whether NRT in ICU patients affects the need for sedatives/analgesics, ventilator days, and ICU stay. METHODS: In a 20-bed ICU, 40 subjects were randomized to either a 21 mg nicotine patch or a placebo nicotine patch daily until either ICU discharge, transfer to a medical floor, or 10 weeks in the ICU. We collected data on sedatives/analgesics use during ICU stay and use and duration of mechanical ventilation . RESULTS: There were 27 male and 13 female subjects. The mean age was 57.4 y in the intervention group and 52.5 y in the control group. The mean Acute Physiology and Chronic Health Evaluation II score was 14.3 in the intervention group and 13.8 in the control group. The mean ICU stay was 4.5 d in the intervention group and 7 d in the control group. The mean number of days on ventilator was 1.9 in the intervention group and 3.5 in the control group. The number of days on sedation/analgesia was less in the intervention group than in the control group. CONCLUSIONS: Although ICU stay and ventilator days decreased numerically in this pilot study, statistically there was no beneficial effect from NRT. (International Standard Randomised Controlled Trial Register ISRCTN66928309)

Evaluation of Solitary Pulmonary Nodule in Human Immunodeficiency Virus Infected Patients

BACKGROUND: While the etiologies of solitary pulmonary nodules (SPNs) in immunocompetent patients are well established, common etiology, diagnostic techniques, and guidelines to assess SPNs in patients infected with human immunodeficiency virus (HIV) have not been established. OBJECTIVE: To define the etiology of SPN in HIV-infected patients and to examine efficacy of diagnostic testing for SPN. METHODS: We performed a retrospective chart review of HIV-infected patients admitted to a designated acquired immune deficiency syndrome (AIDS) center. Microbiological and histopathological specimens from sputum, bronchoalveolar lavage, and biopsies were analyzed. Charts were fully analyzed from time of admission until definitive diagnosis or loss to follow-up. RESULTS: During the 10-year observational period, 10 of 5,000 HIV-infected patients admitted to the hospital were diagnosed with SPN via chest radiography or computed tomography (CT). Among these 10 patients, 6 had a definitive diagnosis. Underlying etiologies included infection (5/10) and lung adenocarcinoma (1/10); none were identified in the remaining 4 subjects. Sputum analysis provided no diagnostic value in discovering pathogenesis in any of these cases. Fiberoptic bronchoscopy with bronchoalveolar lavage and transbronchial biopsy were diagnostic in 3 cases, while CT-guided percutaneous transthoracic needle biopsy (PTNB) was diagnostic in 2 cases. One patient required open lung biopsy. CONCLUSIONS: Etiologies of SPN in HIV-infected patients are varied and difficult to diagnose. In our study, SPN was attributable to infectious etiology in 50% of cases. Sputum analysis was of no diagnostic value. Biopsy is necessary for definitive diagnosis and treatment.

Necrotizing Pneumonia Caused by Group C Streptococci in a Young Adult

While group C beta hemolytic streptococcal infections are uncommon in humans, group C beta hemolytic streptococcal pneumonia is exceedingly rare. To the best of our knowledge, only 2 cases of necrotizing pneumonia caused by group C beta hemolytic streptococcus have been reported in the past. Thus, we are reporting a rare case of necrotizing group C beta hemolytic streptococcal pneumonia in a young healthy adult with no risk factors.