Solubility-Permeability Interplay in Facilitating the Prediction of Drug Disposition Routes, Extent of Absorption, Food Effects, Brain Penetration and Drug Induced Liver Injury Potential

Here I detail the use of measures of permeability rate and solubility in predicting drug disposition characteristics through the utilization of the Biopharmaceutics Drug Disposition Classification System (BDDCS) and the Extended Clearance Classification System (ECCS) as well as the accuracy of the systems in predicting the major route of elimination and the extent of oral absorption of a new small molecule therapeutics. I compare the BDDCS and ECCS with the FDA Biopharmaceutics Classification System (BCS). I also detail the use of the BCS in predicting food effects and the BDDCS in predicting brain disposition of small molecule therapeutics and in validating DILI predictive metrics. This review provides an update of the current status of these classification systems and their uses in the drug development process.

Recurring paroxysmal positional vertigo: evaluation of the vascular factor

To evaluate the effective incidence of vascular factor in the recurrence of benign paroxysmal positional vertigo (BPPV), we studied 50 subjects, 32 affected by idiopathic recurrent BPPV (study group) and 18 healthy subjects (control group). All subjects underwent complete otoneurological balance and haemodynamic evaluation by extracranial colour-coded duplex sonography (ECCS) of vertebral arteries (VA) with indication of arterial flow in ml/min, and retinal fluorangiography (FAG). The ECCS of 19 patients (59.3%) within the study group presented a reduction in vertebral arterial flow, exceeding the limits established by normative values (< 100 ml/min). In all cases, the same side was affected by BPPV, emphasised by vertebral hypoperfusion. The remaining 13 patients (40.6%) showed an arterial vertebral flow entirely within the normative values. The FAG excluded qualitative alterations of the cerebral microcirculation. The ECCS demonstrated that 59.3% of the study group showed a significant reduction in vertebral arterial flow ipsilateral to the semicircular canal affected by BPPV. This increased to 68.75% when the flow difference (D) between both the vertebral arteries were considered and reached 71.8% when vascular risk factors were evaluated. We conclude that reduced perfusion of the vestibular structures makes an already critical situation even more difficult, which can eventually develop into labyrinth suffering. The absence of fluorangiographic signs suggests that the labyrinthine neuroepithelium is much more sensitive to hypoperfusion than the retina. We hypothesise that this ischaemic situation could degenerate utricular macula, otolith detachment, leading to the development of recurrent BPPV. This risk situation for the labyrinth can also be revealed by the evaluation of three parameters: presence of vascular risk factors, reduction of vertebral flow < 100 ml/min and the difference in flow between the 2 vertebral arteries > 29 ml/min.

The professional interpreter's effect on empathic communication in medical consultations: A qualitative analysis of interaction

OBJECTIVE

To investigate how empathic communication is expressed in interpreter-mediated consultations (IMCs) and the interpreter's effect on it.

METHODS

We coded 20 authentic video-recorded IMCs by using the Empathic Communication Coding System (ECCS). We compared patient-initiated empathic opportunities (EOs) and doctors' responses as expressed by patients and doctors and as rendered by interpreters.

RESULTS

We identified 44 EOs. In 2 of the 44 EOs there was a close match in the way the EOs were expressed by the patient in the first place and in the way they were rendered by the interpreter. Twenty-four of the 44 EOs that were passed on by the interpreter to the doctor and presented the doctor with an opportunity to respond, came with a shift in meaning and/or intensity. Twenty of the 44 EOs were not passed on by the interpreter to the doctor.

CONCLUSION

In IMCs, EOs are subject to the interpreter's renditions and the doctor's actions during interaction.

PRACTICE IMPLICATIONS

Doctors and interpreters require skills to detect patient cues, assess them correctly, render them completely and in an appropriate manner (interpreters) and display communicative behaviours that take into account the intricacies of interpreter-mediated clinical communication and facilitate each other's communicative goals.

Investigating empathy in interpreter-mediated simulated consultations: An explorative study

OBJECTIVE

To explore i) the ways in which empathic communication is expressed in interpreter-mediated consultations; ii) the interpreter's effect on the expression of empathic communication.

METHODS

We coded 9 video-recorded interpreter-mediated simulated consultations by using the Empathic Communication Coding System (ECCS) which we used for each interaction during interpreter-mediated consultations. We compared patients' empathic opportunities and doctors' responses as expressed by the patients and doctors and as rendered by the interpreters.

RESULTS

In 44 of the 70 empathic opportunities there was a match between the empathic opportunities as expressed by the patients and as rendered by the interpreters. In 26 of the 70 empathic opportunities, we identified 5 shift categories (reduced emotion, omitted emotion, emotion transformed into challenge, increased challenge/progress, twisted challenge) in the interpreter's rendition to the doctor. These were accompanied by changes in the level of empathy and in the content of the doctors' empathic responses.

CONCLUSION

The interpreters' renditions had an impact on the patients' empathic opportunities and on the doctors' empathic responses in one third of the coded interactions.

PRACTICE IMPLICATIONS

Curricula with a focus on intercultural communication and/or empathy should consider the complexity of interpreter-mediated interaction and the interpreter's impact on the co-construction of empathy.