QTc interval measurement in patients with right bundle branch block: A practical method

Background and Aim

Prolonging the QT interval in the right bundle branch block (RBBB) can create challenges for electrophysiologists in estimating repolarization time and eliminating the effect of depolarization changes on QT interval. In this study, we aimed to develop a practice formula to eliminate the effect of depolarization changes on QT interval in patients with RBBB.

Methods

This prospective study evaluated accidentally induced RBBB in patients undergoing electrophysiological study. Two expert electrophysiologists recorded the ECG parameters, including QRS duration, QT interval, and cycle length, in the patients. The formula was developed based on QT interval differences (with and without RBBB) and its proportion to QRS. Additionally, the Bazzet, Rautaharju, and Hodge formulas were used to evaluate QTc.

Results

We evaluated 96 patients in this study. The mean QT interval without RBBB was 369.39 ± 37.38, reaching 404.22 ± 39.23 after inducing RBBB. ΔQT was calculated as 34.83 ± 17.61, and the ratio of ΔQT/QRS with RBBB was almost 23%. Our formula is: (QT_{with RBBB} − 23% × QRS). Subtraction of 25% instead of 23% seems more straightforward and practical. Our formula could also predict the QTc interval in RBBB based on the Bazzet, Rautaharju, and Hodge formulas.

Conclusion

Previous formulas for QT correction were hard to apply in the clinical setting or were not specified for RBBB. Our new formula allows a rapid and practical method for QT correction in RBBB in clinical practice.     

Tranexamic acid microinjections versus tranexamic acid mesoneedling in the treatment of facial melasma: A randomized assessor-blind split-face controlled trial

Background

Melasma is a hyperpigmentary disorder causing cosmetic disfigurement. We aimed to compare the efficacy and safety of tranexamic acid (TXA) microinjections with TXA mesoneedling for facial melasma.

Methods

This randomized assessor-blind split-face controlled trial included patients with symmetric facial melasma. One side of the face received TXA (100 mg/ml) mesoneedling and the other side intradermal TXA microinjections. The interventions were repeated three times with 4-week intervals (weeks 0, 4, and 8). The primary outcome was improvement in modified Melasma Area and Severity Index (mMASI) 4 weeks after the final treatment session. Secondary outcomes were complications and patient satisfaction with the treatments evaluated by a visual analog scale (VAS).

Results

All 27 patients included in the study were female (mean age: 44.22 ± 8.39 years). Both groups were comparable in terms of mMASI scores before and after treatment (standardized mean difference [SMD] = 0.32, 95% confidence interval [CI] −0.22; 0.85, p = 0.248 and SMD = −0.13, 95% CI −0.66; 0.40, p = 0.633, respectively). The mMASI score change from baseline was not different (SMD = −0.39, 95% CI −0.93; 0.15, p = 0.157). However, patient satisfaction was significantly higher with TXA mesoneedling (SMD = 0.77, 95% CI 0.21; 1.32, p = 0.007). Post-inflammatory hyperpigmentation occurred in one patient in the TXA mesoneedling group. Erythema, scaling, and edema were significantly higher with TXA mesoneedling (p < 0.001).

Conclusions

TXA mesoneedling was comparable with TXA microinjection in the treatment of facial melasma, while patient satisfaction was significantly higher with TXA mesoneedling; however, the high frequency of complications occurring with this treatment should be taken into account.     

Frequency of delirium and its associated factors among COVID-19 inpatients in Iran

Background and aim

Delirium has been presented as the leading cause of sudden change in the mental state of patients with coronavirus disease 2019 (COVID-19). Given that the delayed diagnosis of such a dysfunction is often associated with excess mortality, it seems essential to devote vastly more attention to this significant clinical characteristic.

Materials and methods

This cross-sectional study was performed on 309 patients [viz. 259 cases hospitalized in general wards and 50 individuals admitted to the intensive care unit (ICU)]. For this purpose, a Demographic-Clinical Information Questionnaire, the Confusion Assessment Method (CAM), the Confusion Assessment Method for the ICU (CAM-ICU), the Richmond Agitation-Sedation Scale (RASS) and face-to-face interviews were completed by a trained senior psychiatry resident. The data analysis was further done with the SPSS Statistics V22.0 software package.

Results

Out of 259 patients admitted to the general wards and 50 cases in the ICU due to COVID-19, 41 (15.8%) and 11 (22%) individuals were diagnosed with delirium, respectively. As well, a significant relationship was observed between the incidence rate of delirium and age (p < 0.001), level of education (p < 0.001), hypertension (HTN) (p = 0.029), a history of stroke (p = 0.025), a history of ischemic heart disease (IHD) (p = 0.007), a history of psychiatric disorders, a history of cognitive impairment (p < 0.001), use of hypnotic and antipsychotic medications (p < 0.001) and a history of substance abuse (p = 0.023). Among 52 patients with delirium, only 20 cases had received psychiatric consultation by consultation-liaison psychiatry service for the possibility of delirium.

Conclusion

In view of the high frequency of delirium among COVID-19 inpatients, their screening for this important mental state should be a priority in clinical settings.     

A systematic review of medical science students' knowledge and related factors towards burns first aids

This systematic review aims to examine the knowledge of medical science students about burn first aid. A comprehensive, systematic search was performed in different international electronic databases, such as Scopus, PubMed, Web of Science, and Persian electronic databases such as Iranmedex, and Scientific Information Database (SID) using keywords extracted from Medical Subject Headings such as “Knowledge”, “First aid”, “Medical science student” and “Burn” from the earliest to February 1, 2023. The quality of the studies included in this systematic review was evaluated by using the appraisal tool for cross-sectional studies (AXIS tool). Thirteen studies had a total of 5046 students studying medical sciences. Among them, 62.24% were female and 77.67% were medical students. The studies included in this systematic review were conducted in Saudi Arabia, Pakistan, Syria, Egypt, and Malaysia. Medical science students' average knowledge of first aid for burns is 56.92 out of 100, which is considered to be a moderate level of knowledge. Factors such as the experience of first aid training, academic year, clinical experience, and economic status had a significant positive relationship with the knowledge of medical science students about first aid for burns. Also, factors such as age, academic specialisation, academic year, information sources, and fathers' occupation had a significant relationship with the knowledge of medical students about first aid for burns. Therefore, it is suggested that healthcare managers and policymakers make the necessary plans to ensure that first aid training courses are implemented during medical science students' studies as a part of their curriculum.     

A systematic review of nursing students' attitude and related factors towards pressure ulcer prevention

The purpose of this review study is to investigate the attitude of nursing students toward the prevention of pressure ulcers (PUs) and related factors. From February 1, 2023, a comprehensive search was conducted in international and Persian electronic databases such as Web of Science, PubMed, Scopus, Iranmedex, and Scientific information database (SID). The keywords obtained from Medical Subject Headings, including “Attitude”, “Nursing students”, and “Pressure ulcer” were used in this search. The quality assessment of the present studies in this systematic review was based on the appraisal tool for cross-sectional studies (AXIS tool). A total of 6454 nursing students participated in ten cross-sectional studies. All students were studying at the undergraduate level and 81.20% of them were female. Nursing students were in the first (39.27%), second (28.19%), and third and fourth (32.54%) academic years. Among the participants, 49.86% have completed at least 2 clinical units. The mean scores of attitudes toward PU prevention in nursing students based on attitude toward PU prevention (APuP) and researcher-made questionnaires were 75.01% and 68.82%, respectively. The attitude of nursing students was influenced by various factors, including age, sex, academic year, clinical experience, number of clinical units, experience in caring for PU patients, previous courses on PU in the curriculum, and contribution of training to knowledge. Also, in the present study, the positive relationship between the attitude and knowledge of nursing students was shown as the only significant correlation. In sum, the attitude of the majority of nursing students toward the prevention of PUs was at a satisfactory level. Therefore, it is expected to transfer the necessary knowledge to them with proper planning so that preventive actions can be carried out by following the guidelines.