An Examination and Comparison of Stethoscope Hygiene in Nursing Education Programs.

BACKGROUND: Improper stethoscope hygiene has been found to contribute to the development of health care associated infections, which affects approximately one in every 30 hospitalized patients. Various pathogens have been found on the stethoscopes of health care workers. METHOD: A correlational descriptive design was used to compare stethoscopes from 117 nursing students. Sterile swab samples were obtained from four separate areas of each stethoscope. Samples were plated and incubated for 24 to 48 hours. RESULTS: Bacteria were found on all parts of the stethoscopes from both undergraduate and graduate nursing students, with the earpiece having the highest percentage of contamination. Staphylococcus was the most prevalent microbe found on all four swab sites. CONCLUSION: Educating students about stethoscope hygiene and consistently reinforcing it in practice are essential to reduce the transmission of pathogens in the health care environment. Nurses can model best practice with students and other disciplines to increase the likelihood of adherence. [J Nurs Educ. 2021;60(5):277-280.].

Akarnan: The Stethoscope and Making of Modern Ayurveda, Bengal, c. 1894-1952.

The histories of modern medical technologies have largely been studied exclusively within the biomedical context. Yet historians of medicine have increasingly demonstrated that a number of non-biomedical therapeutic traditions-Ayurvedic and Chinese medicine to name only two-have attained their own distinctive modernity. How has the incorporation of various medical technologies affected these neo-traditional medicines? What is the relationship between technologies and the body knowledge in non-biomedical therapeutics? Do shared technologies such as the stethoscope reveal the same bodily facts in biomedical and Ayurvedic contexts? These are some of the questions explored in this article by focusing on the uptake of the stethoscope in modern Ayurvedic medicine in Bengal. In the process the article also describes the emergence of a new sonic body in modern Ayurveda.

A novel deep learning based automatic auscultatory method to measure blood pressure.

BACKGROUND: It is clinically important to develop innovative techniques that can accurately measure blood pressures (BP) automatically. OBJECTIVES: This study aimed to present and evaluate a novel automatic BP measurement method based on deep learning method, and to confirm the effects on measured BPs of the position and contact pressure of stethoscope. METHODS: 30 healthy subjects were recruited. 9 BP measurements (from three different stethoscope contact pressures and three repeats) were performed on each subject. The convolutional neural network (CNN) was designed and trained to identify the Korotkoff sounds at a beat-by-beat level. Next, a mapping algorithm was developed to relate the identified Korotkoff beats to the corresponding cuff pressures for systolic and diastolic BP (SBP and DBP) determinations. Its performance was evaluated by investigating the effects of the position and contact pressure of stethoscope on measured BPs in comparison with reference manual auscultatory method. RESULTS: The overall measurement errors of the proposed method were 1.4 ± 2.4 mmHg for SBP and 3.3 ± 2.9 mmHg for DBP from all the measurements. In addition, the method demonstrated that there were small SBP differences between the 2 stethoscope positions, respectively at the 3 stethoscope contact pressures, and that DBP from the stethoscope under the cuff was significantly lower than that from outside the cuff by 2.0 mmHg (P < 0.01). CONCLUSION: Our findings suggested that the deep learning based method was an effective technique to measure BP, and could be developed further to replace the current oscillometric based automatic blood pressure measurement method.

Bacteriological assessment of stethoscopes used by healthcare workers in a tertiary care centre of Nepal.

OBJECTIVE: Stethoscope is a medical device universally used by health care workers. Stethoscope may transmit pathogens among patients and health care workers if it is not disinfected. The objective of this study was to, determine the level of stethoscope contamination used by health care workers, survey the practices of disinfecting the stethoscope, identify various microorganisms and assess their role as potential pathogens and determine the effectiveness of 70% ethanol as a disinfecting agent. RESULTS: This was a cross-sectional study conducted in the department of Microbiology, Chitwan Medical College, Bharatpur, Nepal. Stethoscopes of 122 health care workers from different departments were included in this study. Out of a total 122 diaphragms, 88 (72.1%) were colonized. Only 71 (58.1%) bells and 152 earpieces (66.2%) were contaminated. Micrococcus and coagulase negative staphylococci were predominantly isolated species. The contamination was lowest among stethoscopes cleaned after touching every patient (11.5%) and the difference is statistically significant (P < 0.0001). Significantly lower level of contamination (13.6%) were found on stethoscopes cleaned everyday (P < 0.0001). Only 8.5% stethoscope showed growth with decreased number of colonies after disinfecting the stethoscopes with 70% ethanol. Thus, demonstrating the effectiveness of disinfection.

Computerized respiratory sounds: a comparison between patients with stable and exacerbated COPD.

INTRODUCTION: Diagnosis of acute exacerbations of chronic obstructive pulmonary disease (AECOPD) is often challenging as it relies on patients' clinical presentation. Computerized respiratory sounds (CRS), namely crackles and wheezes, may have the potential to contribute for the objective diagnosis/monitoring of an AECOPD. OBJECTIVES: This study explored if CRS differ during stable and exacerbation periods in patients with COPD. METHODS: 13 patients with stable COPD and 14 with AECOPD were enrolled. CRS were recorded simultaneously at trachea, anterior, lateral and posterior chest locations using seven stethoscopes. Airflow (0.4-0.6l/s) was recorded with a pneumotachograph. Breathing phases were detected using airflow signals; crackles and wheezes with validated algorithms. RESULTS: At trachea, anterior and lateral chest, no significant differences were found between the two groups in the number of inspiratory/expiratory crackles or inspiratory wheeze occupation rate. At posterior chest, the number of crackles (median 2.97-3.17 vs. 0.83-1.2, P < 0.001) and wheeze occupation rate (median 3.28%-3.8% vs. 1.12%-1.77%, P = 0.014-0.016) during both inspiration and expiration were significantly higher in patients with AECOPD than in stable patients. During expiration, wheeze occupation rate was also significantly higher in patients with AECOPD at trachea (median 3.12% vs. 0.79%, P < 0.001) and anterior chest (median 3.55% vs. 1.28%, P < 0.001). CONCLUSION: Crackles and wheezes are more frequent in patients with AECOPD than in stable patients, particularly at posterior chest. These findings suggest that these CRS can contribute to the objective diagnosis/monitoring of AECOPD, which is especially valuable considering that they can be obtained by integrating computerized techniques with pulmonary auscultation, a noninvasive method that is a component of patients' physical examination.

Auscultating heart and breath sounds through patients' gowns: who does this and does it matter?

BACKGROUND: Doctors are taught to auscultate with the stethoscope applied to the skin, but in practice may be seen applying the stethoscope to the gown. OBJECTIVES: To determine how often doctors auscultate heart and breath sounds through patients' gowns, and to assess the impact of this approach on the quality of the sounds heard. METHODS: A sample of doctors in the west of Scotland were sent an email in 2014 inviting them to answer an anonymous questionnaire about how they auscultated heart and breath sounds. Normal heart sounds from two subjects were recorded through skin, through skin and gown, and through skin, gown and dressing gown. These were played to doctors, unaware of the origin of each recording, who completed a questionnaire about the method and quality of the sounds they heard. RESULTS: 206 of 445 (46%) doctors completed the questionnaire. 124 (60%) stated that they listened to patients' heart sounds, and 156 (76%) to patients' breath sounds, through patients' gowns. Trainees were more likely to do this compared with consultants (OR 3.39, 95% CI 1.74 to 6.65). Doctors of all grades considered this practice affected the quality of the sounds heard. 32 doctors listened to the recorded heart sounds. 23 of the 64 (36%) skin and 23 of the 64 (36%) gown recordings were identified. The majority of doctors (74%) could not differentiate between skin or gown recordings, but could tell them apart from the double layer recordings (p=0.02). Trainees were more likely to hear artefactual added sounds (p=0.04). CONCLUSIONS: Many doctors listen to patients' heart and breath sounds through hospital gowns, at least occasionally. In a short test, most doctors could not distinguish between sounds heard through a gown or skin. Further work is needed to determine the impact of this approach to auscultation on the identification of murmurs and added sounds.

The stethoscope and healthcare-associated infection: a snake in the grass or innocent bystander?

There is a concern that stethoscopes may transmit infectious agents which could result in healthcare-associated infection (HCAI). The aim of this review was to evaluate the available literature as to the role of the stethoscope in the development of HCAI. A literature search was conducted across several databases for relevant studies and reports. Stethoscopes were consistently shown to harbour bacteria. The mean rate of stethoscope contamination across 28 studies was 85% (range: 47-100%). The majority of bacteria isolated were deemed to be non-pathogenic. The most frequently isolated organisms were coagulase-negative staphylococci. The mean level of contamination was in excess of the French Normalization standard for cleanliness (which equates to <20 colony-forming units per membrane) in all six studies in which contamination levels were quantified. Potentially pathogenic organisms cultured from stethoscopes included: Staphylococcus aureus, Pseudomonas aeruginosa, vancomycin-resistant enterococci, and Clostridium difficile. There was evidence that bacteria can transfer from the skin of the patient to the stethoscope and from the stethoscope to the skin. However, studies were not designed to detect a correlation between stethoscope contamination and subsequent HCAI. Surveys assessing cleaning practices revealed a suboptimal commitment to stethoscope disinfection among doctors and medical students. The optimum method for stethoscope cleaning has not been defined, although alcohol-based disinfectants are effective in reducing bacterial contamination. In conclusion, a link between contaminated stethoscopes and HCAI has not yet been confirmed, but transfer of bacteria between skin and stethoscope has been shown. The available information would suggest that stethoscopes should be decontaminated between patients.

Stethoscope versus point-of-care ultrasound in the differential diagnosis of dyspnea: a randomized trial.

We aimed to determine the accuracies of point-of-care ultrasound (PoCUS) and stethoscopes as part of the physical examinations of patients with dyspnea. Three emergency medicine specialists in each of two groups of ultrasound and stethoscope performers underwent didactic and hands-on training on PoCUS and stethoscope usage. All the patients enrolled were randomized to one of two predetermined PoCUS or stethoscope groups. The diagnostic performance of ultrasonography was higher than that of the stethoscope in the diagnoses of heart failure (90 vs. 86%, 1.00 vs. 0.89, and 5.00 vs. 4.92, respectively) and pneumonia (90 vs. 86.7%, 0.75 vs. 0.73, and 16.50 vs. 13.82, respectively). No significant differences were observed in the utility parameters of these modalities in these diagnoses. Although some authors argue that it is time to abandon the 'archaic tools' of past centuries, we believe that it is too early to discontinue the use of the stethoscope.

Spectral analysis of the heart sounds in children with and without pulmonary artery hypertension.

BACKGROUND: Pulmonary artery hypertension (PAH) is difficult to recognize clinically. Digital stethoscopes offer an opportunity to re-evaluate the diagnosis of PAH. We hypothesized that spectral analysis of heart sound frequencies using recordings from a digital stethoscope would differ between children with and without PAH. METHODS: We recorded heart sounds using a digital stethoscope from 27 subjects (12 males) with a median age of 7 years (3 months to 19 years) undergoing simultaneous cardiac catheterization. 13 subjects had a mean pulmonary artery pressure (mPAp)<25 mm Hg (8-24 mm Hg). 14 subjects had a mPAp≥25 mm Hg (25-97 mm Hg). We applied the fast Fourier transform, power spectral analysis, separability testing, and linear discriminant analysis with leave-one-out cross-validation to the heart sounds recorded from the cardiac apex and 2nd left intercostal space (LICS) to examine the frequency domain. The significance of the results was determined using a t-test and rank-sum test. RESULTS: The relative power of the frequencies 21-22 Hz of the heart sounds recorded at the 2nd LICS was decreased significantly in subjects mPAp≥25 mm Hg versus<25 mm Hg. CONCLUSIONS: Heart sound signals of patients with PAH contain significantly less relative power in the band 21-22 Hz compared to subjects with normal PAp. Information contained in the frequency domain may be useful in diagnosing PAH and aid the development of auscultation based techniques for diagnosing PAH. In the future, utilizing the diagnostic information contained in heart sounds recordings may require analysis of both the time and frequency domains.

Deafness among physicians and trainees: a national survey.

PURPOSE: To describe the characteristics of and accommodations used by the deaf and hard-of-hearing (DHoH) physician and trainee population and examine whether these individuals are more likely to care for DHoH patients. METHOD: Multipronged snowball sampling identified 86 potential DHoH physician and trainee participants. In July to September 2010, a Web-based survey investigated accommodations used by survey respondents. The authors analyzed participants' demographics, accommodation and career satisfaction, sense of institutional support, likelihood of recommending medicine as a career, and current/anticipated DHoH patient population size. RESULTS: The response rate was 65% (56 respondents; 31 trainees and 25 practicing physicians). Modified stethoscopes were the most frequently used accommodation (n = 50; 89%); other accommodations included auditory equipment, note-taking, computer-assisted real-time captioning, signed interpretation, and oral interpretation. Most respondents reported that their accommodations met their needs well, although 2 spent up to 10 hours weekly arranging accommodations. Of 25 physicians, 17 reported primary care specialties; 7 of 31 trainees planned to enter primary care specialties. Over 20% of trainees anticipated working with DHoH patients, whereas physicians on average spent 10% of their time with DHoH patients. Physicians' accommodation satisfaction was positively associated with career satisfaction and recommending medicine as a career. CONCLUSIONS: DHoH physicians and trainees seemed satisfied with frequent, multimodal accommodations from employers and educators. These results may assist organizations in planning accommodation provisions. Because DHoH physicians and trainees seem interested in primary care and serving DHoH patients, recruiting and training DHoH physicians has implications for the care of this underserved population.

Cross-sectional study of frequency and factors associated with stethoscope cleaning among medical practitioners in Pakistan.

Stethoscope diaphragms are frequently colonized by bacteria. This cross-sectional study described the frequency and factors associated with reporting ever cleaning stethoscopes among 408 medical students and doctors at a medical college and 2 teaching hospitals in Rawalpindi, Pakistan. A minority of the respondents (37.7%) reported having ever cleaned their stethoscope. Following normal clinical use, wiping with a dry cloth was the most frequently reported method of cleaning (53.2%). After contamination of the diaphragm with blood or secretions, cleaning with an alcoholic swab was the most common method (64.3%). In univariate and multivariate analyses, history of receiving information on stethoscope cleaning, utilization of personal stethoscope at last use and affiliation with internal medicine department were factors strongly associated with ever cleaning of stethoscope. Future research for improving stethoscope cleaning practices should explore educational interventions aimed at health care professionals.

Nurse anesthesia program requirements for esophageal/precordial stethoscope earpieces: a survey.

Student nurse anesthetists are often required to purchase an auscultatory earpiece device for use in the clinical setting. Although the device is required, students have observed that many anesthesia providers in the clinical setting no longer use this piece of equipment. The purpose of this project was to determine the number of anesthesia programs that required mandatory purchase of the auscultatory earpiece by student nurse anesthetists. A brief survey was developed to collect data from the directors of all 105 accredited nurse anesthesia programs in the United States. The survey was completed by 63 (60%) of the program directors, and 62 completed surveys were used in the analysis. Results revealed that 95% of the responding nurse anesthesia programs (59 of 62) require esophageal/ precordial stethoscope earpieces for their students, but 46% (27) of those programs provide the earpieces. Most (76%) of the programs required the use of the earpieces in the clinical setting, but only 45% thought that they should be used for monitoring every anesthetic delivered.

Do general practitioners use what's in their doctor's bag?

OBJECTIVE: To find out what general practitioners (GPs) take with them on house calls and how frequently they use it? DESIGN: A questionnaire about the drugs and medical equipment used during house calls. SETTING: Two peer review groups of GPs in Overijse and Hoeilaart (Belgium). SUBJECTS: 29 GPs. MEAN OUTCOME MEASURES: Availability and use of drugs and medical equipment on house calls. RESULTS: All GPs had a stethoscope, a sphygmomanometer, an otoscope and sterile injection syringes at their disposal on house calls and they used them frequently. Only 57% took a blood glucose sensor with them and 25% took the medical records on home visits. Though only 50% always carried all of the most common emergency drugs with them, almost 100% of GPs had administered all of them in the previous 12 months. Only epinephrine and atropine were not frequently administered. CONCLUSION: Most of the GPs were sufficiently equipped to meet most situations that can occur during house visits and emergency calls. Most of the available drugs and equipment were used during the 12 months preceding the registration. Only the medical records and a blood glucose sensor were insufficiently available.