Calculating cardiac output from transmitral volume flow using Doppler and M-mode echocardiography

To simplify transmitral volume flow determination by Doppler echocardiography, a formula for calculating mean mitral valve orifice area using M-mode echocardiography without any 2-dimensional measurements was developed and evaluated in this study. The maximal mitral orifice area was assumed to be circular and its diameter was calculated from the maximal M-mode mitral leaflet separation. The maximal area was multiplied by the mean to maximal anterior mitral leaflet excursion ratio to correct for phasic changes in flow orifice area during ventricular filling. This measurement had a high correlation (r = 0.97, standard error of the estimate + 0.26 cm2) with mean mitral valve orifice area calculated from frame-by-frame analysis of short-axis 2-dimensional echoes in a select group of 10 normal volunteers and 10 patients with cardiomyopathy who had very high quality images of the mitral valve leaflet tips. Cardiac output calculated using the new method for orifice area estimation combined with apex view mitral valve Doppler velocities was then validated in 48 consecutive patients undergoing thermodilution cardiac output determinations with a close correlation between Doppler and thermodilution cardiac output (2.3 to 6.1 liter/min, r = 0.93, standard error of the estimate = 362 ml). The correlation improved when 12 patients with mild mitral insufficiency were excluded (r = 0.95). The M-mode echocardiogram-derived mitral valve orifice method combined with Doppler mitral valve velocities is accurate, easy to perform, has a high success rate and should increase the applicability of Doppler echocardiography for estimation of cardiac output.     

Radiological Hazard Evaluation of Some Egyptian Magmatic Rocks Used as Ornamental Stone: Petrography and Natural Radioactivity

Magmatic rocks represent one of the most significant rocks due to their abundance, durability and appearance; they can be used as ornamental stones in the construction of dwellings. The current study is concerned with the detailed petrography and natural radioactivity of seven magmatic rocks. All are commercial granitic rocks and are identified as black Aswan, Nero Aswan, white Halayeb, Karnak, Verdi, red Hurghada and red Aswan. Their respective mineralogical compositions are classified as porpheritic granodiorite, granodiorite, tonalite, monzogranite, syenogranite, monzogranite and syenogranite. A total of nineteen samples were prepared from these seven rock types in order to assess their suitability as ornamental stones. Concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K radionuclides were measured using NaI (Tl) scintillation gamma-ray spectrometry. Among the studied magmatic rocks, white Halayeb had the lowest average values of ²²⁶Ra (15.7 Bq/kg), ²³²Th (4.71 Bq/kg) and ⁴⁰K (~292 Bq/kg), all below the UNSCEAR reported average world values or recommended reference limits. In contrast, the other granitic rocks have higher values than the recommended limit. Except for the absorbed dose rate, other radiological hazard parameters including radium equivalent activity, annual effective dose equivalent, external, and internal hazard indices reflect that the White Halyeb rocks are favorable for use as ornamental stone in the construction of luxurious and high-demand residential buildings.     

Knowledge of cervical cancer and acceptance of HPV vaccination among secondary school students in Sarawak, Malaysia

Cervical cancer is the third most common cancer in women in peninsular Malaysia and very prevalent worldwide. HPV vaccination and routine Pap smear testing are the best preventive measures. The objective of this study was to determine the knowledge level of secondary school students from Sarawak, East Malaysia regarding cervical cancer and its prevention. Multistage random sampling with various methods in each step was employed to select the sample of 76 students. Results showed that 61.8% had poor knowledge level of cervical cancer and its prevention. There were 60.5% of students who were aware of cervical cancer with Chinese and form four students showing significantly the highest awareness (p<0.05). The main source of cervical cancer information was from their parents (25.9%). HPV vaccination acceptance among students was 22.3% and an association was found between knowledge of cervical cancer with race and HPV vaccination acceptance (p<0.05). In conclusion, the students had poor knowledge level of cervical cancer, its prevention and HPV vaccination acceptance. More efforts should be made to improve cervical cancer knowledge and awareness of the public especially secondary school students in Sarawak. This in turn will enhance the practice of prevention against cervical cancer among students.     

Levobupivacaine patient controlled analgesia: Epidural versus blind fascia iliaca compartment analgesia – A comparative study

This study was designed to compare the analgesic efficacy of levobupivacaine patient controlled analgesia epidural versus patient controlled analgesia with fascia lliaca compartment block. In patients undergoing fixation of fracture neck femur.MethodsSixty patients ASA II&III undergoing fixation of fracture neck femur were randomly allocated into two groups (n = 30).Group EEpidural group given levobupivacaine 0.25% 15 ml before induction of general anesthesia, followed by postoperative PCEA with levobupivacaine (0.125%).Group FFascia iliaca block group given levobupivacaine 0.25% 30 ml through the catheter before induction of general anesthesia, followed by postoperative patient controlled fascia illiaca analgesia with levobupivacaine (0.125%).Severity of postoperative pain at rest in 24 h using VAS, number of patients required additional analgesia (tramadol) in 24 h, doses of postoperative 24 h tramadol consumed, postoperative mean arterial blood pressure and heart rate were recorded.ResultsThe severity of postoperative pain was statistically significantly less in E group, number of patients required tramadol in 24 h were statistically significantly less in E group than F group, postoperative tramadol consumed was statistically significantly less in E group than F group.ConclusionPCEA with levobupivacaine (0.125%) was associated with satisfactory analgesia than patient controlled analgesia with fascia iliaca block in patients undergoing fixation of fracture neck femur.