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Biomedical subjects

D G Heidemann

Publications and source records attributed to D G Heidemann.

At least 19 recordsLinked to original sources
PubMed2001

Cluster of Mycobacterium chelonae keratitis cases following laser in-situ keratomileusis.

PURPOSE: To describe a cluster of Mycobacterium chelonae keratitis cases involving patients who underwent laser in-situ keratomileusis (LASIK) at a single refractive surgery center. DESIGN: Descriptive case series of four patients and cohort study to identify disease associations. METHODS: Examination schedules, diagnostic tests, and therapy were based on best medical judgment. Isolates from three patients were compared by pulsed-field gel electrophoresis. Epidemiologic studies were performed to identify the source of infection. RESULTS: Seven of eight eyes developed M. chelonae keratitis following bilateral simultaneous LASIK. Each patient was thought to have diffuse lamellar keratitis initially, but all seven eyes were noted to have opacities suggestive of infectious keratitis by 13 to 21 days after surgery. All eyes had undergone hyperopic LASIK over four days in April 2001 by one surgeon in a community-based refractive surgery center. A cohort study of all patients undergoing LASIK at the same center in April 2001 revealed that M. chelonae keratitis occurred only in persons undergoing correction of hyperopia (seven of 14 eyes vs. none of 217 eyes undergoing myopic LASIK, P <.001). The only difference identified between procedures was use of masks created from a soft contact lens in hyperopic LASIK. Three isolates (three patients) were indistinguishable by pulsed-field gel electrophoresis. Eyes were treated with a combination of antimicrobial agents, including topical azithromycin in three patients, with resolution of infection in all eyes over 6 to 14 weeks. The source of infection was not identified on environmental cultures. CONCLUSION: Postoperative nontuberculous mycobacterial keratitis can occur in an epidemic fashion following LASIK. Topical amikacin, azithromycin, clarithromycin, ciprofloxacin, or a combination of these agents, appears to be effective treatment for these infections.

Anti-Bacterial Agents↗
PubMed2000

Infectious keratitis after photorefractive keratectomy in a comanaged setting.

A 48-year-old man had simultaneous bilateral photorefractive keratectomy (PRK). The surgeon who performed the PRK did not see the patient in follow-up, and there was confusion regarding the comanaging doctor. Therefore, the patient was not examined immediately postoperatively. Several days later, he was hospitalized for an unrelated, painful orthopedic problem and heavily sedated. Seven days after the PRK, an ophthalmologist was consulted for ocular irritation and discharge. Examination showed bilateral, purulent conjunctivitis and severe infectious keratitis in the left eye. The patient was treated with periocular and topical antibiotics. Corneal cultures yielded Staphylococcus aureus. The keratitis resolved slowly, leaving the patient with hand motion visual acuity. A corneal transplant and cataract extraction was performed 15 months later, resulting in a best corrected visual acuity of 20/400 because of glaucomatous optic nerve damage. Severe infectious keratitis may occur after PRK. Poor communication between the surgeon, comanaging doctor, and patient may result in treatment delay.

Anti-Bacterial Agents↗
PubMed1999

Early- versus late-onset infectious keratitis after radial and astigmatic keratotomy: clinical spectrum in a referral practice.

PURPOSE: To compare the clinical characteristics of early- versus late-onset keratitis after radial keratotomy (RK) and astigmatic keratotomy (AK). SETTING: Referral subspecialty practice. METHODS: This retrospective review comprised 19 patients with infectious keratitis after RK and AK. Early- versus late-onset groups were analyzed for predisposing conditions; infiltrate location, size, and depth; microbiologic data; and final visual outcome. RESULTS: Ten patients in the early-onset group developed keratitis within a mean of 7.4 days after surgery (range 3 to 14 days). Nine patients in the late-onset group developed keratitis a mean of 5.4 years after surgery (range 1.5 to 15.0 years). Staphylococcus aureus was the predominant organism in the early-onset group and Pseudomonas aeruginosa in the late-onset group. In the early-onset group, most infiltrates occurred in the paracentral aspect of the RK incision and extended to the middle or posterior stroma. In the late-onset group, most infiltrates occurred in the peripheral portion of the RK incision and were localized to the superficial stroma. A hypopyon was present in 7 of 10 ulcers in the early group and in 1 of 9 in the late group. Two patients in the early group developed endophthalmitis. Most patients in the late-onset group had incisional pseudocysts; 2 had other risk factors for keratitis. Final visual acuity was 20/40 or better in 7 of 10 patients in the early group and in 8 of 9 patients in the late group. CONCLUSIONS: Early-onset corneal ulcers after incisional refractive keratotomy were usually paracentral and deep, whereas late-onset ulcers were usually peripheral and superficial. Despite the predominance of Staphylococcus and Pseudomonas in the early- and late-onset groups, respectively, a variety of organisms may be responsible for infections in keratotomy incisions.

Adult↗
PubMed1995

Aspergillus keratitis after radial keratotomy.

PURPOSE/METHODS: A case of severe Aspergillus keratitis after radial keratotomy manifested as a discrete midstromal infiltrate along a radial incision. Despite aggressive treatment with topical amphotericin B and oral itraconazole, the patient required a therapeutic penetrating keratoplasty. RESULTS/CONCLUSIONS: Histopathologic examination disclosed a corneal ulcer with numerous septate, branching hyphae throughout the stroma, and marked stromal necrosis. Aspergillus species should be included among the microbial pathogens responsible for infectious keratitis after radial keratotomy. If infectious keratitis is suspected, comprehensive cultures for bacteria and fungi should be obtained.

Amphotericin B↗
PubMed1993

Unusual causes of giant papillary conjunctivitis.

We report two unusual causes of giant papillary conjunctivitis (GPC). One patient developed GPC secondary to and elevated filtering bleb. Another patient developed focal GPC secondary to elevated calcific plaques (band keratopathy). The first patient's symptoms improved after treatment with sodium cromolyn drops. GPC resolved in the second patient after superficial keratectomy was performed. These cases represent two unusual causes of GPC and emphasize the role of mechanical trauma as a causative factor.

Adult↗
PubMed1992

Transsclerally sutured intraocular lenses in penetrating keratoplasty.

We reviewed the charts of 114 consecutive patients who underwent penetrating keratoplasty with transscleral fixation of a posterior chamber intraocular lens. Two patients died within three months of follow-up and were excluded from the study. In the remaining 112 patients, follow-up ranged from four to 47 months (mean, 17.2 months). Postoperative visual acuity improved in 95 patients (85%), remained the same in 13 patients (11.5%), and worsened in four patients (3.5%). In 71 patients with at least one year of follow-up, best-corrected visual acuity was 20/40 or better in 17 patients (24%), 20/50 to 20/80 in 25 patients (35%), 20/100 to 20/400 in 17 patients (24%), and counting fingers or worse in 12 patients (17%). Problems with lens decentration, tilt, dislocation, or scleral suture-related infections were minimal. Glaucoma and cystoid macular edema were the most common causes of decreased visual acuity. Four patients (3.6%) developed intraoperative choroidal detachments. Three patients (2.7%) developed rhegmatogenous retinal detachments early in the postoperative course.

Adult↗
PubMed1991

Corynebacterium striatus keratitis.

We report a case of diphtheroid keratitis that occurred in a compromised cornea. Corneal cultures yielded heavy growth of Corynebacterium striatus on blood and chocolate agar. The infection responded slowly to treatment with topical fortified cefazolin and fortified tobramycin. This case demonstrates that diphtheroids are capable of causing ocular infections and should not routinely be dismissed as contaminants or commensals.

Aged↗
PubMed1990

Acanthamoeba keratitis associated with disposable contact lenses.

Two patients developed Acanthamoeba keratitis associated with the use of disposable extended-wear hydrogel contact lenses. Both patients removed, irrigated, and reinserted the contact lenses without disinfecting them. One patient wore the lenses on a daily basis, rinsed the lenses in tap water, stored them overnight, and discarded them weekly. Both infections were treated successfully. In a third patient, Acanthamoeba species was cultured from two pairs of disposable lenses that had been stored in cases rinsed with well water. Potential benefits from disposable contact lens wear are negated when patients do not comply with a continuous wearing schedule.

Adolescent↗
PubMed1990

Topical anesthetic abuse.

Topical ocular anesthetic abuse is a serious disorder causing keratitis and persistent epithelial defects. It may be the result of either prescription by the patient's eye care practitioner, theft from the practitioner's office, or occult additives in therapeutic medications. The authors report observations of six individuals suffering from this disorder which suggest that persistent epithelial defects, corneal stromal ring infiltrates, disproportionate pain, and prescription or nonprescription substance abuse may be factors involved. Penetrating keratoplasty was required to treat corneal perforation in two patients, and permanent corneal structural damage was noted in two eyes. Two eyes had a relentless downhill course culminating in enucleation. Because five of the six patients were diagnosed and treated as having presumed Acanthamoeba keratitis during the course of their disease, topical ocular anesthetic use should be included in the differential diagnosis of chronic keratitis and may masquerade as Acanthamoeba keratitis. The authors believe that practitioners should not prescribe or dispense topical anesthetics and should avoid clinical settings which provide an opportunity for the theft of topical ocular anesthetics.

Acanthamoeba Keratitis↗
PubMed1990

Tissue plasminogen activator and penetrating keratoplasty.

We report a patient who developed severe intraocular fibrin formation following penetrating keratoplasty and vitrectomy surgery. The fibrin response worsened despite aggressive treatment with topical steroids. On the second postoperative day, 25 micrograms of intracameral tissue plasminogen activator was administered, resulting in rapid resolution of the fibrin response. The graft remained clear. We believe tissue plasminogen activator may be useful in selected cases of severe, recalcitrant postkeratoplasy fibrin formation.

Eye Diseases↗
PubMed1990

Visual results and complications of transsclerally sutured intraocular lenses in penetrating keratoplasty.

We retrospectively reviewed the charts of 56 consecutive patients who had undergone penetrating keratoplasty with transscleral fixation of a posterior chamber intraocular lens. Follow-up ranged from 3 to 28 months (mean, 11.1 months). Postoperative visual acuity improved in 46 patients (82%), remained the same in eight (14%), and worsened in two (3.6%). In 32 patients with at least 10 months' follow-up, best corrected visual acuity as measured with a pinhole or hard contact lens was 20/40 or better in 12 (38%), 20/50 to 20/10 in 10 (31%), and 20/200 or worse in 10 (31%). Problems with lens decentration, tilt, or scleral suture-related infections were minimal. Glaucoma was the msot common cause of decreased vision in patients with 10 or more months' follow-up. Three patients (5.4%) developed rhegmatogenous retinal detachments early in the postoperative course.

Adult↗
PubMed1990

Endogenous Listeria monocytogenes endophthalmitis presenting as keratouveitis.

We report a case of Listeria monocytogenes endophthalmitis that presented as a recalcitrant keratouveitis in a nonimmunocompromized patient. L. monocytogenes was recovered from the patient's aqueous, vitreous, and two of three blood cultures. He was treated with topical, subconjunctival, and systemic antibiotics, but the visual outcome was poor, possibly because of late diagnosis. A review of previous cases of L. monocytogenes endophthalmitis demonstrates unique features of this infection: (a) presentation as an anterior uveitis or keratouveitis with elevated intraocular pressure, (b) endogenous origin, and (c) frequent occurrence in nonimmunocompromized patients.

Aged↗
PubMed1988

Necrotizing keratitis caused by Capnocytophaga ochracea.

We studied three cases of Capnocytophaga keratitis that demonstrated stromal necrosis and a ring infiltrate. In all cases, the keratitis occurred in a previously diseased or traumatized cornea. One patient was treated with chronic antiamoebic therapy for presumed Acanthamoeba keratitis. Two cases resulted in corneal perforation. Laboratory isolation was difficult because of slow, fastidious growth. Capnocytophaga is not uniformly sensitive to commonly used topical antibiotics such as the cephalosporins and aminoglycosides, but may respond to treatment with topical clindamycin.

Adult↗
PubMed1987

Branhamella catarrhalis keratitis.

Branhamella catarrhalis, formerly known as Neisseria catarrhalis, has structural similarities to Neisseria gonorrhoeae, but is generally considered to be nonpathogenic. We studied the clinical and laboratory data of four previously reported cases and six additional cases of B. catarrhalis keratitis. All patients had a predisposing ocular or systemic condition, or both. There were various clinical characteristics, but in most cases the infiltrate occurred in the central or paracentral cornea. A prompt response to treatment with a cephalosporin and aminoglycoside antibiotic was noted in all cases. Two patients had corneal perforations, which probably resulted from a delay in treatment. Gram-negative diplococci from corneal scrapings may not necessarily represent N. gonorrhoeae.

Adolescent↗
PubMed1987

Neisseria gonorrhoeae keratoconjunctivitis.

Clinical and laboratory findings of 47 patients with ocular infections secondary to Neisseria gonorrhoeae during a 5 1/2-year period were reviewed. In 16 patients (34%), corneal involvement was noted. Six of these patients had a severe ulcerative keratitis resulting in permanent visual loss and five required surgery for a corneal perforation. Patients with corneal involvement were older and presented later in the course of their disease than patients with isolated conjunctival involvement (P less than 0.005). An out-patient regimen of intramuscular antibiotics (either penicillin, cephalosporin, or spectinomycin [Trobicin]) appeared to be effective for infections limited to the conjunctiva in adults. If a topical antibiotic ointment is used in addition to parenteral antimicrobial agents, the authors' laboratory sensitivities suggest that erythromycin may be the drug of choice.

Acute Disease↗