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Biomedical subjects

H J Puhakka

Publications and source records attributed to H J Puhakka.

At least 19 recordsLinked to original sources
PubMed2002

Virtual endoscopy imaging of the middle ear cavity and ossicles.

Ten cadaver temporal bone blocks were studied with high-resolution computed tomography (HRCT) in order to produce topographic images, which are more informative than ordinary CT slices. Virtual endoscopic images were produced with separate, commercially available software, paying attention to the middle ear cavity and ossicles. Four major viewing locations for virtual endoscopy (the ear canal, hypotympanum, attic and eustachian tube) developed images acceptably. The malleus and incus were visualized properly. Small structures such as the lenticular process and the stapes sometimes failed to have good imaging. The eustachian tube and attic virtual views, which are usually not receptive to ordinary endoscopy, gave proper visualization of middle ear structures. Even the smallest structure, the stapes, can produce a virtual image.Virtual endoscopic images, or topographic images, of the middle ear and ossicles contribute to the understanding of the anatomy of the middle ear, thus enhancing the chances for successful surgery.

Adult↗
PubMed2001

Comparison of CT and fiberoptic video-endoscopy findings in congenital dysplasia of the external and middle ear.

Twenty-six ears (of 25 patients) with congenital dysplasia of the external and middle ear were studied with two different types of imaging technologies in order to find out if it is possible to improve the anatomical overview of the dysplastic middle ears by combining the imaging methods. All the 26 ears were studied with computed tomography (CT), which gave cross-sectional images of the tympanic cavity. A fiberoptic video-endoscope (FVE) was introduced through the nose and via the Eustachian tube into the middle ear so that the topographic view of the anatomical structures of the middle ear could be visualized. Some structures were visualized better with FVE than with CT and vice versa. We concluded that the combined information obtained from these two imaging technologies provided a better understanding of the structural anatomy of a congenital dysplastic middle ear.

Abnormalities, Multiple↗
PubMed2001

Bacterial etiology of acute myringitis in children less than two years of age.

BACKGROUND: Acute myringitis is an inflammation of the tympanic membrane that occurs alone or in association with external otitis or otitis media. The two clinical entities, based on physical examination, are bullous myringitis and hemorrhagic myringitis. OBJECTIVES: To investigate the association of concomitant middle ear disease with acute myringitis and to analyze the bacteriologic findings of the middle ear fluid in children with acute myringitis. METHODS: A prospective longitudinal cohort study of 2028 children age 7 to 24 months at primary care level in the Finnish Otitis Media Vaccine Trial. Matched case-control design for analysis of bacterial pathogen distribution. RESULTS: There were 82 children in whom 92 ears were diagnosed with acute bullous myringitis and 37 children in whom 40 ears were diagnosed with hemorrhagic myringitis during the follow-up. Middle ear disease was associated with bullous myringitis in 97% of ears and with hemorrhagic myringitis in 82% of ears. Bacterial pathogen distribution was similar to that of acute otitis media, although a higher proportion of Streptococcus pneumoniae was detected in both bullous and hemorrhagic acute myringitis. CONCLUSIONS: Middle ear fluid was present in vast majority of ears with acute myringitis in young children. The same etiologic bacteria were found in acute myringitis as in acute otitis media, but S. pneumoniae was the major pathogen. Acute bullous myringitis should be treated as acute otitis media in children <2 years of age.

Acute Disease↗
PubMed2001

Endoscope-guided round window fistula repair.

OBJECTIVE: Endoscope-guided round window membrane repair was performed to evaluate whether the approach is feasible in the treatment of a round window fistula. STUDY DESIGN: Retrospective case review. SETTING: Tertiary care academic center. PATIENT: A 27-year-old man had been scuba diving 6 days previously in the Australian Great Barrier Reefs. He had poor hearing with tinnitus in the left ear and a vertiginous sensation. INTERVENTION: A myringotomy was incised, and a tympanoscope was introduced into the middle ear cavity. With the patient under general anesthesia, the middle ear and the oval and round window areas were examined with a tympanoscope. In endoscopic visualization, a round perforation could be seen in the round window membrane. After detection of the round window perforation, a small piece of temporal fascia was obtained to seal the membrane perforation. RESULTS: One month after the operation, the patient's hearing was significantly better. The myringotomy had healed. CONCLUSION: A transmyringeal endoscopic procedure for round window fistula repair is feasible and combines the best features of minimally invasive surgery and aural endoscopy.

Adult↗
PubMed1999

Epidemiology and aetiology of middle ear cholesteatoma.

A total of 500 patients with cholesteatoma diagnosed and operated during 1982-91 in the region of Tampere University Hospital and Mikkeli Central Hospital in Finland were analysed retrospectively. The mean annual incidence was 9.2 per 100,000 inhabitants (range 3.7-13.9) and during the study period the annual incidence decreased significantly. The incidence was higher among males under the age of 50 years. There was no accumulation of cholesteatoma diseases in lower social groups. The majority (72.4%) of cholesteatoma patients had suffered from otitis media episodes. Tympanostomy was carried out in 10.2% and adenoidectomy or adenotonsillectomy in 15.9% of all cholesteatoma ears prior to cholesteatoma surgery. Cholesteatoma behind an intact tympanic membrane with no history of otitis media was verified in 0.6% of patients and in cleft palate patients in 8%. In this study, 13.2% of patients had ear trauma or ear operation in anamnes.

Adenoidectomy↗
PubMed1998

Visualization of the middle ear with high resolution computed tomography and superfine fiberoptic videomicroendoscopy.

Ten temporal bone blocks were dissected from fresh postmortem specimens from patients succumbing to diseases unrelated to the ears. A superfine fiberoptic videomicroendoscope (SFV) was introduced through the eustachian tube into the middle ear, and middle ear structures were visualized. The cadaver temporal bone blocks were also studied with high-resolution computed tomography (HRCT). When HRCT gave good results SFV did not succeed well and vice versa. However, SFV provided topographic anatomical information of the middle ear structures while HRCT gave cross-sectional images of the anatomy of the tympanic cavity. The different types of information obtained by the two imaging technologies supplement each other and were found to improve diagnosis in such cases as external ear canal atresia.

Adult↗
PubMed1998

Tympanoscopy to increase the accuracy of diagnosis in conductive hearing loss.

The diagnosis of conductive hearing loss is usually based on audiological methods and radiology. The aim of our study was to show that there is a useful additive method to clarify the findings of diseases with conductive hearing loss. Patients (151 ears) with conductive hearing loss were examined using several methods: otomicroscopy, air- and bone-conduction threshold,pure tone average, speech threshold, speech discrimination, tympanometry and stapedial reflex and tympanoscopy. The management of the patients changed in 17 per cent of cases due to tympanoscopy. In a group with normal tympanic membrane the movement of the stapes during endoscopy was compared to stapedial reflex. Stiff stapes were found more often than an abnormal stapedial reflex. Middle ear endoscopy can increase the accuracy of diagnosis of conductive hearing loss thus enhancing decision making in the case of the patient.

Adolescent↗
PubMed1997

Endoscopy and otomicroscopy in the estimation of middle ear structures.

In order to study the variation within and between endoscopy and otomicroscopy a Gage repeatability and reproducibility design was created, with which the middle ears were studied of eight cadaver temporal bone blocks through the ear canal three times in random order using both methods. A Zeiss OPMT-1 operating microscope and Olympus endoscopes were used. The data were analysed in accordance with the analysis of variance principle, where the total variation was divided into different components. The anatomical areas were counted and registered via quadrants. There was a distinct difference between the results of the two methods in favour of the endoscopes. Furthermore, the variation between the methods and between the trials was analogous.

Aged↗
PubMed1997

Endoscopy of the middle ear structures.

The anatomical structures of the middle ear cleft were investigated with endoscopes of angle of view of 0 degree , 3 degrees and 90 degrees (1.7 mm in diameter). Temporal bone blocks donated by lately succumbed patients were studied 3 times in random order. Forty-three anatomical structures of the middle ear cleft were chosen for inspection. The anatomical structures were counted and registered alternately at the time of endoscopy through 4 quadrants of the tympanic membrane. The study included 12,384 observation pieces. The results are presented in tables. The most suitable quadrant of the tympanic membrane and the angle of endoscope for optimal visualization are presented. The visualization is also presented by anatomical structure and by quadrants of the tympanic membrane. The authors' opinion for selection of the most convenient quadrant of the tympanic membrane and suitable angle of endoscope is presented. The majority of the anatomical structures could be visualized with either a 30 degrees or 90 degrees endoscope. There were difficulties in observing the neck of the malleus, the head of the malleus and the lateral semicircular canal. There was no benefit from the use of a 0 degree angled endoscope in the visualization of the middle ear structures.

Aged↗
PubMed1992

Tracheostomy in pediatric patients.

From 1978 to 1987, tracheostomy was performed on 33 children, 13 boys and 20 girls, with a male to female ratio of 0.65:1. The mean age at the time of tracheostomy was 726 days, 76% of the children being under the age of two years. The incidence of pediatric tracheostomy per hospital admissions was 0.05%. Subglottic stenosis (13 children) and respiratory distress syndrome with prolonged endotracheal ventilation (11 children) were the most common indications for tracheostomy. The mean duration of prolonged endotracheal intubation before tracheostomy was 64 days, and that of tracheostomy treatment 117 days. During the tracheostomy period, five children died, but only one death was related to tracheostomy. The total rate of complications was 30%. We emphasize the importance of strict indications for pediatric tracheostomy.

Adolescent↗
PubMed1992

Indispensability of mediastinoscopy in intrathoracic tuberculosis.

An analysis of 33 patients with histologically confirmed intrathoracic tuberculous lymphadenopathy was made. Tuberculosis could have been diagnosed without mediastinoscopy only in 3 patients: 2 had positive bronchial cultures and 1 simultaneous cervical lymph node tuberculosis. Bacteriological confirmation is conclusive, but seldom possible. Mediastinoscopy provides the best method to obtain tissue samples, and consequently, it is still necessary in the diagnosis of intrathoracic tuberculous lymphadenitis.

Adolescent↗
PubMed1992

Peripheral facial palsy caused by Borrelia burgdorferi and viruses in south-western Finland.

In a prospective study from 1983 through 1984, 77 patients (31 men and 46 women with a mean age of 47 +/- 20 years) with peripheral facial palsy of primarily unknown etiology were investigated. Only 2 patients with acute otitis media received antibiotics. Serology of the patients was investigated on days 1 and 14. IgG and IgM antibodies against herpes simplex, varicella-zoster and cytomegalovirus were determined by enzyme immunoassay, and against Epstein-Barr virus by immunofluorescence. In a retrospective analysis, IgM, IgA and IgG antibodies against Borrelia burgdorferi were determined by enzyme immunoassay. Borreliosis was diagnosed in 5 patients and varicella-zoster infection in 7. There was no statistically significant difference in recovery time between the different groups. Follow-up time for the patients with borreliosis was over 5 years. Neither meningeal symptoms nor polyneuropathy was observed in the patients with borreliosis even in the absence of antibiotic therapy.

Adult↗
PubMed1991

[Acute otitis--a problem affecting children, families and health services].

The true incidence of acute otitis media appears to be on the increase. According to the findings of a number of studies, acute otitis affects 40 per cent of all children during the first years of life. In the article are discussed the prevalence, diagnosis, treatment, follow-up and prevention of acute otitis media in children.

Acute Disease↗
PubMed1990

Subglottic stenosis in neonates and children. Clinical findings and therapy.

From 1978 through 1987, acquired subglottic stenosis was confirmed endoscopically in 31 children. The mean gestational age of the children was 32 weeks and mean birthweight 2,180 g. Of the children 84% were below 12 months of age at the time of diagnosis. Respiratory distress syndrome was confirmed in 17 children. Before diagnosis, 97% of the children had been treated by endotracheal intubation for ventilatory support, the mean duration of intubation being 37 days. In 10 children, subglottic stenosis was mild and mature and these children were followed up only. Endolaryngeal prosthesis was employed in 2 children and laryngotomy with autogenous bone graft in 5 children. Mean follow-up time was 5 years 4 months. At follow-up, 18 of the children showed good or excellent results.

Child↗
PubMed1990

Mediastinoscopy in relation to clinical evaluation.

The aim of the study was to evaluate the entire spectrum of mediastinoscopy, from common to rare conditions, in relation to clinical judgement. The 2021 consecutive patients comprised 992 with 'open' clinical diagnoses at mediastinoscopy and 1,029 with verified or presumptive diagnoses. In the first group the most common indications for mediastinoscopy were pulmonary infiltrate (73%) and mediastinal shadow (17%), and in the second group they were bronchogenic carcinoma (57%) and sarcoidosis (38%). Mediastinoscopy was classified as positive in 43% of the first, and 60% of the second group. Of the total series, 51% had positive mediastinoscopy findings, the most common being malignant disease (24%) and sarcoidosis (21%). Mediastinoscopy was useful especially for evaluating malignant mediastinal involvement, but also for differentiation of lymphadenopathies and in diagnosis of rare diseases.

Adolescent↗
PubMed1990

Dynamic imaging of pulmonary ventilation in children using digital subtraction radiography.

Digital subtraction radiography is a sensitive method for imaging changes in pulmonary aeration during the respiratory cycle. The findings of 75 consecutive dynamic pulmonary examinations performed on 49 pediatric patients using this technique were reviewed together with the findings at chest radiography and, in 18 cases, with bronchoscopy. Symmetric diaphragmatic movement and synchronous, homogeneous variation in the attenuation of lung parenchyma indicated normal conditions in 9 (18%) patients. The most common abnormal finding (36 patients) was an asynchronous variation in the attenuation of the lung parenchyma. A greatly diminished or absent variation in attenuation was diagnostic for a serious air passage obstruction in 7 children. Other abnormal findings were a lowered amplitude of diaphragmatic movement, asynchronous diaphragmatic movement and mediastinal shift. In 10 patients (20%) the dynamic study showed parenchymal abnormalities when chest radiography was normal. Bronchoscopy was performed in 4 of these 10 patients and showed abnormalities in each case.

Adolescent↗