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- af Geijerstam, Peder, Doktorand, 1983-
(författare)
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Home Blood Pressure in Health and Disease
- 2024
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Hypertension is the most common preventable cause of premature all-cause mortality, primarily from cardiovascular disease (CVD). Individuals with dysglycemia, including prediabetes and diabetes, are at increased risk. Licorice intake raises blood pressure (BP) through the effects of glycyrrhizic acid (GA), but the true limit of safe intake is uncertain. Home BP has several benefits over BP measured at a clinic, including a higher predictive value for CVD. By combining office and home BP, it is possible to diagnose masked hypertension (MH), in which home but not office BP is elevated, and white coat hypertension (WCH), in which office but not home BP is elevated. The aim of this thesis was to advance our knowledge on home BP in relation to dysglycemia, markers of CVD, and licorice intake. The first 3 papers used data from the Linköping cohort of the prospective Swedish CArdioPulmonary bioImage Study (SCAPIS). Study IV was a randomized controlled cross-over study. Data was obtained from questionnaires, blood samples and office and home BP measurements. In studies I-III, pulse wave velocity (PWV), coronary artery calcium score (CACS), and carotid artery plaques as markers of CVD were also included. In Study I, we examined 5025 men and women aged 50-64 years old for the relation between dysglycemia and home BP. Both the systolic office and home BP measurements were positively as-sociated with dysglycemia. Participants with dysglycemia vs normoglycemia more often had MH. The findings were in line with previous research and strengthened the association between dysglycemia and MH. In Study II, we examined the associations between MH and markers of CVD in 4122 individuals without BP-lowering treatment. Of participants, 4.2% had MH, and these were more often men and had higher BMI than those with normotension. Participants with MH also had higher odds for CACS ≥100, an as-sociation which has previously been suggested as a trend.In Study III, we examined the relation between soluble P-se-lectin (sP-selectin) as a measure of thrombotic activity, plasma high-sensitivity C-reactive protein (hsCRP) as a measure of inflammation, and home BP in 4548 participants. Both markers were higher in each hypertension phenotype compared with sustained normotension. The quartile of participants with the highest sP-se-lectin values had higher odds for CACS ≥100 and carotid artery plaques. The association between sP-selectin and sustained hyper-tension was novel and not affected by adjustments for hsCRP. In Study IV, 28 healthy participants aged 18-30 years old were evaluated for the effects of a daily intake of licorice containing 100 mg of GA compared with a control product for 2 weeks. During the licorice intake period, the systolic home BP increased with 3.1 mmHg, and the suppression of serum aldosterone and plasma renin levels indicated that this was due to the licorice intake. In conclusion, this thesis further strengthens the idea that both home and office BP measurements have values beyond that of the other, and that home BP may be most valuable in individuals with dysglycemia and obesity, and in men. Finally, licorice may be more potent than previously known, suggesting the need for increased awareness.
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| 2. |
- Bengtsson Boström, Kristina
(författare)
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Genetic Factors Contributing to Hypertension. With Emphasis on Hypertension in Type 2 Diabetes
- 2002
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The causes of hypertension (HT) and type 2 diabetes (T2DM) are mainly unknown, but they arise from interplay between several genetic and environmental factors. The aim of this thesis was to investigate whether polymorphisms in putative candidate genes for HT increase the susceptibility to HT and/or T2DM. The DD genotype of the angiotensin converting enzyme (ACE) gene I/D polymorphism was associated with HT in a large population-based study from Skara, Sweden, particularly with HT combined with T2DM in lean patients less than 70 years. Further, the D allele increased mortality in male patients with HT and T2DM. Three polymorphisms in the angiotensinogen gene were not found to be associated with HT and/or T2DM. A novel association between hypertension and the Arg389Arg genotype of the Arg389Gly polymorphism in the beta 1 adrenergic receptor (B1AR) gene was shown in a case-control study from southern Sweden. The Arg389Arg genotype conferred higher diastolic blood pressure levels and increased heart rate in genotype discordant sibling pairs from Finland. Finally, the Arg16 and Gln27 alleles of the Arg16Gly and Gln27Glu polymorphisms in the beta 2 adrenergic receptor (B2AR) gene were shown to be associated with hypertension combined with T2DM. The Arg16 allele conferred higher systolic blood pressure levels and higher body mass index in genotype discordant sibling pairs. In conclusion, the ACE gene DD genotype increases the susceptibility to HT and ID and DD genotypes confer an increased risk of mortality. Genetic variants of B1AR and B2AR genes influence blood pressure and increase susceptibility for HT.
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| 3. |
- Hultstrand, Cecilia, 1990-
(författare)
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Creating access to cancer care : an exploration of patient-provider encounters in primary care, and sociodemographic factors
- 2021
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Background: Access to care is widely discussed in both research and practice. However, previous research about access to care has mainly focused on individual behaviors of seeking care, and theories about access have mostly focused on quantifiable dimensions, such as supply and demand. Thus, the possibility that the patient–provider interaction may have importance for patients’ access to further care has not been thoroughly explored. Additionally, time to diagnosis and treatment is an important outcome measure and quality indicator related to access to care.Aim: The overall aim was to explore how access to cancer care is created through patient–provider encounters in primary care, and whether sociodemographic factors are related to access to care, after the introduction of Standardized Cancer Patient Pathways (CPPs).Methods: A combination of different methodologies was applied for collecting data, such as participant observations and interviews, as well as data collection from medical records reviews and registers. Initially, primary care encounters between patients seeking care for symptoms that cause suspicion of cancer, that is, alarm symptoms, and their physicians were observed (study I). These physicians and patients were then invited to participate in individual interviews (studies II & III). Lastly, medical records reviews were performed and linked with data from the Swedish Cancer Register on patients diagnosed with colorectal cancer (CRC), and with data from Statistics Sweden and Google Maps (study IV). From a social constructivist perspective, the qualitative data were analyzed using grounded theory method (I & II) and thematic analysis (III). The quantitative data were analyzed descriptively, and analytically using Cox regression (IV).Results: Access is created through interaction in the patient–provider encounter, and is mirrored through processes of negotiating, embodying roles, and adhering to norms. Patients and physicians create access by negotiating the legitimacy of symptoms through processes characterized by dependency, credibility, and reciprocity (I). Second, physicians create access while being pulled between patients and standardized templates, which illuminates the tension between the responsibility physicians have towards their patients and the healthcare organization. It is therefore challenging for physicians to engage in person/patient-centered dialogues, interpret presented symptoms, and match them with standardized criteria (II). Third, standardization seems to oversimplify the complexity that underlies patients’ interaction with healthcare, downplaying the individual uniqueness of each person’s health problem, situation, and needs. Patients experience a need to act as both sellers and customers when interacting with physicians in primary care and when negotiating symptoms while creating access (III). Lastly, even though sociodemographic factors might have impact on the interaction during encounters, sociodemographic factors, such as income, education, and distance to hospital, do not seem to be related to time to diagnosis and treatment for patients with CRC in the study regions (IV).Conclusion: Interaction during encounters has importance for patients’ access to care, which illuminates the significance of reconciling the patient and the provider perspectives. Patients perceive demands on themselves when presenting their symptoms and use different strategies in order to legitimize these. This seems particularly challenging if symptoms are diffuse. Physicians have the responsibility to assess these symptoms and match them with criteria for CPP-referrals, criteria which are not always easy to access and apply. Furthermore, access measured as time to diagnosis and treatment among patients diagnosed with CRC in the study regions was not related to differences in sociodemographic factors.Additionally, this thesis demonstrates the importance for physicians to acknowledge the uniqueness of each patient during encounters, to see, listen, and confirm, while operationalizing their medical expertise in order to identify suspected cancer. Such professional skills seem necessary during patient–provider encounters in primary care. Consequently, this thesis contributes to the existing body of literature by recognizing that interaction inevitably affects access to (cancer) care.
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