Fear Of Suffocation Research Articles

Anxiety and fear at the end of life

Fears and anxieties are a common cause of suffering for patients at the end of life. These are often either fears about dying - for example, fear of unbearable pain or fear of suffocation - or fear of death itself. If unrecognized and untreated, fears and anxieties can contribute to a considerable reduction in the quality of life in the last phase of life. Careful diagnosis of anxiety and fear is therefore crucial. Multimodal treatment, which includes psychotherapy and other non-pharmacological and - if necessary - pharmacological treatments, can provide significant relief.

The unique face of comorbid anxiety and depression: increased interoceptive fearfulness and reactivity.

Anxiety and depression commonly co-occur, yet the underlying brain and behavioral processes are poorly understood. Here we examined the hypothesis that individuals with comorbid anxiety and depression would show increased fearful reactivity to an aversive interoceptive perturbation relative to depressed-only individuals. One-hundred and eighty anxious and/or depressed participants from the Tulsa 1000 study completed multi-level behavioral or functional magnetic resonance imaging assessments of interoception and nociception including breath-hold and cold-pressor challenges, and heartbeat perception and interoceptive attention tasks. One-hundred and four individuals with comorbid depression and anxiety disorders (Dep+Anx) were propensity matched with 52 individuals with depression-only (Dep). Data were analyzed using mixed-effects linear regression. The Dep+Anx group showed significantly greater self-reported fear of suffocation during breath holding (Wilcoxon r = 0.23) and reduced cold pain tolerance (R 2 = 0.027) signified by hand removal during immersion. However, these groups did not differ with respect to neutrally-valenced behavioral indices of heartbeat perception or neural indices of interoceptive attention. Individuals with comorbid depression and anxiety, vs. those with only depression, show increased respiratory fearfulness and nociceptive reactivity during perturbations of these signals, whilst showing similar interoceptive awareness in the absence of perturbation. Our findings suggest that individuals with comorbid anxiety and depression process aversive interoceptive and nociceptive signals differently than those with depression alone, providing support for a process model of increased threat sensitivity and hyperarousal in anxious depression.

Eye movement desensitization and reprocessing (EMDR) and mediative behavioral therapy for the treatment of suffocation related post-traumatic stress disorder (PTSD) in amyotrophic lateral sclerosis (ALS): A case report.

Eye movement desensitization and reprocessing (EMDR) is an established treatment for post-traumatic stress disorders (PTSD). Some patients diagnosed with amyotrophic lateral sclerosis (ALS) experience PTSD following choking or suffocation in the course of progressive loss of the ability to breathe. Although a loss of breathing functions in ALS is relatively common, there are currently no studies available on treatment for the fear of choking following advanced ALS. In this case study, we describe the positive effects of EMDR, an evidence-based form of trauma therapy, in a 48-year-old female, suffering from advanced ALS. As the consequence of ALS, she was not able to speak or breath independently, but could communicate through a speech-generating device. She experienced panic attacks, flashbacks, nightmares, and severe anxiety after her tracheostomy jammed, and she almost suffocated. Mediative treatment was started by instructing the care staff to respond neutrally with step-by-step instructions following tracheostomy jam, resulting in significantly less panic attacks and flashbacks. EMDR was initiated two weeks later, and resulted in full remittance of the trauma symptomatology. The present case study suggests that symptoms of PTSD, namely the strong fear of suffocation, can be successfully treated by means of mediative behavioral therapy combined with EMDR.

Perceptual sensitivity to sensory and affective aspects of dyspnea: Test-retest reliability and effects of fear of suffocation

Perceptual sensitivity for dyspnea (i.e. breathlessness) is often quantified using the slope of magnitude estimations plotted against the physical stimulus intensities of respiratory loads. This study investigated whether this slope and its stability varies as a function of (1) affective versus sensory aspects of dyspnea, and (2) interindividual differences in Fear of Suffocation. Eighty-three healthy women performed a load magnitude estimation task twice one week apart. Resistive loads of increasing magnitude (0–2.4–5–7.4–12.4–20 cmH20/l/s) were repeatedly presented for a single flow-targeted inspiration. One group rated the intensity of loads, another their unpleasantness. Neither slopes nor intercepts differed between sensory versus affective aspects of dyspnea. Intercepts were lower in the second compared to the first session. Fear of Suffocation was associated with flatter slopes. Test-retest reliabilities were low to moderate suggesting that perceptual sensitivity to dyspnea is less stable than commonly assumed.

The impact of unpredictability of dyspnea offset on dyspnea perception, fear, and respiratory neural gating

Dyspnea is a debilitating and threatening symptom in various diseases. Affected patients often report the unpredictability of dyspnea episodes being particularly anxiety-provoking and amplifying the perception of dyspnea. Experimental studies testing dyspnea unpredictability together with related neural processes, physiological fear responses, and dyspnea-related personality traits are sparse. Therefore, we investigated the impact of unpredictability of dyspnea offset on dyspnea perception and fear ratings, respiratory neural gating and physiological fear indices, as well as the influence of interindividual differences in fear of suffocation (FoS). Forty healthy participants underwent a task manipulating the offset predictability of resistive load-induced dyspnea including one unloaded safety condition. Respiratory variables, self-reports of dyspnea intensity, dyspnea unpleasantness, and fear were recorded. Moreover, respiratory neural gating was measured in a paired inspiratory occlusion paradigm using electroencephalography, while electrodermal activity, startle eyeblink, and startle probe N100 were assessed as physiological fear indices. Participants reported higher dyspnea unpleasantness and fear when dyspnea offset was unpredictable compared to being predictable. Individuals with high levels of FoS showed the greatest increase in fear and overall higher levels of fear and physiological arousal across all conditions. Respiratory neural gating, startle eyeblink, and startle probe N100 showed general reductions during dyspnea conditions but no difference between unpredictable and predictable dyspnea conditions. Together, the current results suggest that the unpredictable offset of dyspnea amplifies dyspnea perception and fear, especially in individuals with high levels of FoS. These effects were unrelated to respiratory neural gating or physiological fear responses, requiring future studies on underlying mechanisms.

Knowledge of Malaria and Utilization of Its Preventive Measures among Pregnant Women Attending Antenatal Care at a Tertiary Hospital in Port-Harcourt, Nigeria

Background: Prevention of malaria is a major priority for the roll back malaria partnership which recommends three-pronged approach for reducing the burden of malaria among pregnant women. The WHO framework for malaria prevention during pregnancy in areas of stable malaria transmission recommends IPT, use of ITN, and case management of malaria illness.
 Objective: This study sought to determine the knowledge of malaria and its preventive measures among pregnant women, assess their utilization of malaria preventive measures and attitude to treatment. To ascertain whether there exists any relationship between their knowledge and practice of prevention.
 Methodology: An institutional based, cross-sectional study was carried out. 385 consenting participants, between 18-48 years, were interviewed using a structured questionnaire. Information on socio-demographic characteristics, knowledge of malaria and its preventive measures, use of IPT and ownership/use of ITN, and attitude to treatment were recorded. Data were entered into Excel spreadsheet and analyzed with SPSS version 20. Associations between different variables were determined using Fisher’s exact test or Chi-square test, as appropriate, and logistic regression used to test statistical significance at P<0.05.
 Results: Of the 385 women, 307 (79.7%) had excellent (18.7%) and good (61%) knowledge, while 78 (20.3%) had average (16.6%) and poor (3.6%) knowledge. There was no difference in association of Knowledge with age, marital status, education, occupation, and parity. Of the 385 women, 61.3% were using IPT for chemoprophylaxis, 66.2% were using insecticide spray or repellants and 71.4% owned mosquito net; of these, 84% owned insecticide treated nets, but only 65.8% were using it in this current pregnancy. Reasons for not using nets ranged from unavailable 49.0%, discomfort due to heat 32.9%, fear of suffocation 6.9%, Spouse’s disapproval 3.9% and 1.0% ineffective. There was statistically significant difference between knowledge and use of IPT, ITN and insecticide sprays.
 Conclusion: There was adequate knowledge of malaria in pregnancy and its preventive measures, but utilization of these measures needs improvement. Efforts should be made to address barriers to utilization.

Breathing as Politics and Generational Transmission: Respiratory Legacies of War, Empire and Chinese Patriarchy in Colonial Hong Kong

Abstract The article draws on biographical, autoethnographic and experimental forms of writing in order to reflect on the intergenerational transmission of war and displacement in the late colonial period of British rule in Hong Kong, and Japanese occupation. Intimate histories across three generations reveal experiences typically neglected by customary Chinese or colonial readings of the period. Specifically, the article privileges breathing as a site for analysing the interplay between body and home, dwelling and displacement, and the corporeal and psychic transmission of Chinese patriarchy and Anglo-Chinese intra-familial relations. It links the body as a dwelling for assaults on the ability to breathe—through tuberculosis, opium smoking, asthma and panic—with the physical home that is, in turn, assaulted by bombs, killing, intimate betrayals and fatal illness. Aptly, the Covid-19 “pandemic of breathlessness,” during which the research was conducted, serves as a mnemonic for the reprisal of fears of suffocation and dying.

Association of Claustrophobia and Anxiety with Cast Intolerance in Patients with Extremity Injuries.

Patients undergoing casting for upper or lower extremity injuries may present with recalcitrant pain without an identifiable physiologic etiology, which increases the likelihood of more frequent or unscheduled office visits, insomnia, decreased patient satisfaction, unnecessary investigative procedures or treatments, and-in some cases-cast intolerance. The exact causes of cast intolerance are not well studied, although claustrophobia and associated fears of suffocation and restriction may be underlying causes. We sought to explore the association between claustrophobic tendencies and cast intolerance. We hypothesized that patients with claustrophobia or claustrophobic tendencies would have a higher rate of cast intolerance. Patients requiring circumferential casting of an upper or lower extremity were prospectively enrolled at the time of cast application. Data were collected at each office visit until cast removal. Pre- and post-casting anxiety were quantified using the Beck Anxiety Inventory® (BAI®). Pain was assessed at each visit using the visual analog scale (VAS). Claustrophobic tendencies were evaluated after cast removal using the Claustrophobia Questionnaire (CLQ). At the completion of the study, patients were assigned to either thecast-tolerant or the cast-intolerance cohort according to predetermined criteria. CLQ, BAI, and VAS scores were compared between cohorts. Out of 199 patients enrolled, 4% (n = 8) met the criteria for cast intolerance. There was no difference in BAI (anxiety)scores between groups at casting, but cast-intolerant patients had significantly lower post-casting BAI scores than the cast-tolerant controls, indicating a decrease in anxiety after cast removal. Taken together, both groups demonstrated significant reduction in VAS scores from casting to cast removal. The tolerant group had a significant reduction in VAS scores, whereasthe intolerant group did not. The intolerant group had a significant negative correlation between initial VAS scores and final BAI scores. The tolerant group had a significant positive correlation between initial VAS scores and final BAI scores, as well as between final VAS scores and final BAI scores. Interestingly, no difference in CLQ scores was seen between groups, although there werepositive correlations between CLQ scores and pre- and post-casting anxiety scores and between CLQ and final VAS scores. Our hypothesis was not supported. Although we did not find a relationship between claustrophobia and cast intolerance, we did find significant correlations between anxiety and pain. The tolerant group's initial and final pain scores had significantly positive correlations to final anxiety, suggesting that pain is likely to cause or increase anxiety; indeed, as pain decreased, so did anxiety. The intolerant group, however, had a significant negative correlation between initial pain and final anxiety scores. It would not be expected that lower pain scores would increase anxiety. This may suggest that cast-intolerant patients experience or report their anxiety as pain. These findings may explain why some patients suffer from pain that cannot be explained by an underlying physiologic process and is resistant to traditional pain management. A multidisciplinary approach, including psychological and psychosocial assessments, may help identify nonphysiologic components to pain. An accurate diagnosis for the cause of pain may lead to nonpharmacological interventions and therefore reduce opioid use and overall costs and improve patient outcomes.

Heightened affective response to perturbation of respiratory but not pain signals in eating, mood, and anxiety disorders.

Several studies have recently suggested that an abnormal processing of respiratory interoceptive and nociceptive (painful) stimuli may contribute to eating disorder (ED) pathophysiology. Mood and anxiety disorders (MA) are also characterized by abnormal respiratory symptoms, and show substantial comorbidity with ED. However, no studies have examined both respiratory and pain processing simultaneously within ED and MA. The present study systematically evaluated responses to perturbations of respiratory and nociceptive signals across the levels of physiology, behavior, and symptom report in a transdiagnostic ED sample (n = 51) that was individually matched to MA individuals (n = 51) and healthy comparisons (HC; n = 51). Participants underwent an inspiratory breath-holding challenge as a probe of respiratory interoception and a cold pressor challenge as a probe of pain processing. We expected both clinical groups to report greater stress and fear in response to respiratory and nociceptive perturbation than HCs, in the absence of differential physiological and behavioral responses. During breath-holding, both the ED and MA groups reported significantly more stress, feelings of suffocation, and suffocation fear than HC, with the ED group reporting the most severe symptoms. Moreover, anxiety sensitivity was related to suffocation fear only in the ED group. The heightened affective responses in the current study occurred in the absence of group differences in behavioral (breath hold duration, cold pressor duration) and physiological (end-tidal carbon dioxide, end-tidal oxygen, heart rate, skin conductance) responses. Against our expectations, there were no group differences in the response to cold pain stimulation. A matched-subgroup analysis focusing on individuals with anorexia nervosa (n = 30) produced similar results. These findings underscore the presence of abnormal respiratory interoception in MA and suggest that hyperreactivity to respiratory signals may be a potentially overlooked clinical feature of ED.

A CASE OF SEVERE POST INTUBATION TRACHEAL STENOSIS: BREATHING THROUGH A STRAW

SESSION TITLE: Tuesday Medical Student/Resident Case Report Posters SESSION TYPE: Med Student/Res Case Rep Postr PRESENTED ON: 10/22/2019 01:00 PM - 02:00 PM INTRODUCTION: Post intubation tracheal stenosis (PITS) is a relatively rare but serious complication of intubation. We present a case of severe PITS requiring urgent bronchoscopic intervention. CASE PRESENTATION: A 56 year-old woman former smoker with morbid obesity, obstructive sleep apnea (OSA) and obesity hypoventilation syndrome (OHS), initially admitted for respiratory failure requiring endotracheal intubation and mechanical ventilation for a week. Three weeks after discharge, she returned with increased work of breathing, inability to lie flat and loud stridor. Patient admitted in ICU, in severe respiratory distress, unable to speak more than a few words with fear of suffocation. Imaging of the neck showed severe tracheal stenosis in multiple levels with a minimum diameter of 4.3 mm. Due to severe tracheal stricture, she was not a candidate for endotracheal intubation and her multiple comorbidities made her a poor candidate for surgical treatment. In a team effort by interventional pulmonologist and ENT specialist a bronchoscopy was done which revealed a severe complex tracheal stenosis, 2.5 cm below the vocal cords and 3 cm in length. Balloon dilation was attempted with 50% improvement in lumen size. The intervention provided significant but short-term relief. In the next bronchoscopy sessions, patient underwent laser treatment and gradual tracheal dilation followed by a Dumon silicone hourglass stent placement (16-14-16 mm x 15-20-15 cm). Patient remained stable with significant improvement in functional status for 2 years. She continued to need home oxygen and occasional noninvasive mechanical ventilation partly due to other underlying diseases. Surveillance bronchoscopies ensured a patent airway and no stent complications. The stent was removed upon patient’s agreement after 2years. After a month, dyspnea recurred and bronchoscopy showed narrowing of the trachea but less severe than first time. A silicone stent was placed again after balloon dilation of the trachea. DISCUSSION: Studies of the patients with PITS show they are more likely to be obese females1. Obesity is also associated with EDAC (excessive dynamic airway collapse) and OHS that can lead to respiratory failure and intubation 2,3. Poor functional status and comorbidities associated with morbid obesity often make these patients poor candidates for surgical interventions. Our patient is still at high-risk for tracheal resection. CONCLUSIONS: Bronchoscopic interventions for airway dilation and stents placement can be an effective treatment in patients with tracheal stenosis as a bridge to surgery. More studies are needed to assess the safety of long term placement of silicone stent in patients who are not surgical candidate. Reference #1: Nikolaos Zias, et al. Post tracheostomy and post intubation tracheal stenosis: Report of 31 cases and review of the literature. BMC Pulm Med. 2008; 8:18. Reference #2: Boiselle PM, et al. Dynamic expiratory tracheal collapse in morbidly obese COPD patients. COPD 2013;10:604–610 Reference #3: Lyaker MR, et al. Excessive dynamic airway collapse: An unexpected contributor to respiratory failure in a surgical patient. Case Rep Anesthesiol 2015. 2015:596857 DISCLOSURES: Consultant relationship with Olympus Please note: $1-$1000 Added 03/14/2019 by Ali Sadoughi, source=Web Response, value=Consulting fee Consultant relationship with Olympus Please note: $1-$1000 Added 03/14/2019 by Ali Sadoughi, source=Web Response, value=not yet Consultant relationship with Olympus Please note: $1001 - $5000 Added 03/15/2019 by Ali Sadoughi, source=Web Response, value=not yet No relevant relationships by bradley schiff, source=Web Response No relevant relationships by Neda Valizadeh, source=Web Response

Predictors of behavioral avoidance during respiratory symptom provocation

Excessive anxiety and avoidance during provocation of body symptoms are core features of anxiety-related disorders and might contribute to the development and maintenance of these disorders. Previous studies examined psychological (anxiety sensitivity, fear of suffocation and trait anxiety) and biobehavioral (breath-holding time) predictors of reported anxiety during symptom provocation. However, the role of these predictors on avoidance of feared body symptoms remains unclear. Therefore, the present work aimed at investigating the main and interactive effects of psychological and biobehavioral variables in predicting avoidance during provocation of dyspnea that successively increased in severity. 28 of 69 participants prematurely terminated the provocation sequence, thus preventing further progression of symptom provocation. Logistic regressions revealed that higher anxiety sensitivity and lower breath-holding time were significantly associated with avoidance during exposure. Suffocation fear and trait anxiety were not related to avoidance. Moreover, there was a significant interaction between breath-holding time and anxiety sensitivity in predicting avoidance. Participants with a lower breath-holding time showed more avoidance behavior when reporting high as compared to low anxiety sensitivity. The data suggest that anxiety sensitivity and breath-holding time increase the risk to show avoidance and thus might contribute to the development and maintenance of anxiety-related disorders.

Dyspnea from Neuropsychyatric Perspective: a Narrative Review.

Dyspnea or breathlessness is a term primarily used in respiratory medicine. Nevertheless, in the last fifteen years, studies from other fields focus on the affective component of this complex phenomenon due to the frequent observation that psychological states can cause or be caused by dyspnea. Research so far shows that besides the biological component, dyspnea has a strong emotional and psychosocial determinant. This means that apart from its biological factors, dyspnea and its intensity are affected by emotions, personality, anxiety and depression, etc. Individuals with psychiatric disorders, in the same conditions, will evaluate their dyspnea as more intense and disturbing compared to individuals without psychiatric comorbidity. Emotional states in healthy individuals can amplify the sense of dyspnea which is of extreme importance for clinical practice in order to consider the whole person and not just the symptom which is being presented. Also, dyspnea seems to be frequent complaint in some groups of patients with psychiatric disorders (e.g.panic disorder), where the fear of suffocation is presented as clinical symptom. Futher research of dyspnea as a complex, multicomponent phenomenon, can contribute to better treatment options and better differential diagnosis concerning possible psychiatric background of physical symptoms.

Cue and context conditioning to respiratory threat: Effects of suffocation fear and implications for the etiology of panic disorder

Interoceptive threats play a crucial role in the etiology of panic disorder (PD). While body sensations may become conditioned stimuli (CS) when paired with such interoceptive threats (cue conditioning), the environment in which such interoceptive threats occur may also be learned as a predictor of threat (context conditioning). Suffocation fear (SF) might facilitate these associative learning processes if threats of suffocation become relevant as unconditioned stimuli (US). To investigate whether SF affects associative learning during such respiratory threat, we used mild dyspnea as CS that predicted the occurrence of strong dyspnea (US) in one context (predictable), was not related to the occurrence of the US in another context (unpredictable) or was presented in a different context (safe) in which no US was delivered. Startle eyeblink responses and subjective reports were assessed in 34 participants during learning. Individuals reporting high SF showed a clear potentiation of the startle response during the interoceptive CS predicting the occurrence of interoceptive threat (US). Such startle potentiation was not observed when the CS remained unpaired (safe or unpredictable context). Moreover, high SF persons also showed a significant startle potentiation to the threatening context, when the CS did not predict the onset of the US. No such learning effects were observed for low SF individuals. The data support the view that defensive response mobilization can be triggered by cues but also by contexts that predict the occurrence of interoceptive threats if these threats are relevant for the individuals, supporting learning accounts for the development of PD.

When dyspnea gets worse: Suffocation fear and the dynamics of defensive respiratory responses to increasing interoceptive threat.

In patients with anxiety and/or respiratory diseases, body sensations, particularly from the respiratory system, may increase in intensity and aversiveness and thus lead into defensive action (e.g., escape) or panic. The processes, however, that might contribute to the culmination of symptoms and the switch into defensive action have not been well understood yet. The current study aimed at evaluating an experimental paradigm to characterize the dynamics of defensive mobilization to body sensations increasing in intensity and aversiveness. Persons reporting low and high suffocation fear (SF; N = 69) were exposed to increasingly unpleasant feelings of dyspnea induced by inspiratory resistive loads and a breathing occlusion requiring voluntary breath holding. Respiratory responses were assessed along with subjective reports of anxiety and panic symptoms. Presentation of respiratory loads with increasing physical resistance led to increasingly unpleasant feelings of dyspnea. Twenty-eight participants terminated the exposure prematurely at least once. When dyspnea was severe, high compared to low SF persons exhibited an increased respiratory rate that was accompanied by reports of more intense panic symptoms. Premature terminations of exposure were preceded by a surge in anxiety, breathing frequency, and mouth pressure, and a decrease in tidal volume. We successfully established an experimental paradigm to assess changes in defensive responding with increasing intensity of an interoceptive threat. The current data foster our understanding of behavioral expression patterns observed in patients with anxiety and/or respiratory diseases and the processes involved in the culmination of bodily sensations and anxiety into panic.

Sleep-Related Laryngospasm Caused by Gastroesophageal Reflux

Sleep-related laryngospasm is a rare cause of sleep-related breathing disturbance which produce stridor or interruption of airflow associated with a distinct polysomnography arousal pattern. We report a case of a sixty-five-year-old woman who was referred for awakenings with abrupt respiratory distress and fear of suffocation. A polysomnography showed a total or near-total cessation of airflow, followed by choking and stridor for several minutes with a rapid increase in heart rate. Temporary hoarseness was seen. The esophageal pH monitoring indicated acid reflux, which confirmed gastroesophageal reflux disease. The protonpump inhibitor eliminated the sleep-related laryngospasm. Keywords: Laryngospasm, Gastroesophageal reflux, Polysomnography

Before and after, the impact of available on-demand treatment for HAE.

Availability of effective treatment for acute attacks is expected to transform the care of hereditary angioedema (HAE) patients. We felt that it would be of interest to test these assumptions by examining the perceptions of HAE patients regarding the impact that these therapies have had on their lives. Patients at a United States HAE Association summit meeting were asked to rate the burden of HAE currently and compare by recall with 2009 when these therapies were not available. Questions covered five domains: psychological/emotional status, ability to carry out daily activities, fear of suffocation, worry about their children inheriting HAE, and medication side effects. Data were analyzed using Wilcoxon signed-rank tests or analysis of variance. Responses were obtained from 134 self-identified HAE subjects: 85 type I, 21 type II, and 28 with normal C1 inhibitor (C1INH). Burden of disease showed significant improvement in all domains except worry about children inheriting HAE. With the introduction of newer therapies, subjects with the most severe burden of illness improved more than those with milder burdens. However, significant burden of illness remained. The availability of the current treatments has substantially improved the quality of life for HAE patients in the United States, similar to a survey of Danish HAE patients regarding the introduction of home treatment. Nevertheless, our study shows that a substantial burden of illness remains for HAE patients.

Dimensional structure of bodily panic attack symptoms and their specific connections to panic cognitions, anxiety sensitivity and claustrophobic fears.

Previous studies of the dimensional structure of panic attack symptoms have mostly identified a respiratory and a vestibular/mixed somatic dimension. Evidence for additional dimensions such as a cardiac dimension and the allocation of several of the panic attack symptom criteria is less consistent. Clarifying the dimensional structure of the panic attack symptoms should help to specify the relationship of potential risk factors like anxiety sensitivity and fear of suffocation to the experience of panic attacks and the development of panic disorder. In an outpatient multicentre study 350 panic patients with agoraphobia rated the intensity of each of the ten DSM-IV bodily symptoms during a typical panic attack. The factor structure of these data was investigated with nonlinear confirmatory factor analysis (CFA). The identified bodily symptom dimensions were related to panic cognitions, anxiety sensitivity and fear of suffocation by means of nonlinear structural equation modelling (SEM). CFA indicated a respiratory, a vestibular/mixed somatic and a cardiac dimension of the bodily symptom criteria. These three factors were differentially associated with specific panic cognitions, different anxiety sensitivity facets and suffocation fear. Taking into account the dimensional structure of panic attack symptoms may help to increase the specificity of the associations between the experience of panic attack symptoms and various panic related constructs.

Subjective ratings of prolonged inspiratory resistive loaded breathing in males and females.

Dyspnea and fear of suffocation are burdensome to patients with respiratory disease. Inspiratory resistive loads offer an experimental respiratory stimulus to quantify the discriminative domain of respiratory perception. Resistive (R) load magnitude estimation (ME) and subjective ratings were measured over sustained multiple breaths in healthy subjects. There was no significant group difference between the ME for Breath 1 and 20 for small R loads, but a significant gender difference for large R loads. Subjective responses of fear, fear of suffocation, displeasure, chest pressure, faintness, dizziness, fear of losing control, trembling, and tingling were significantly greater for females. These results demonstrate that ME of large resistive sustained loads elicits nonsignificant increases in ME in females, but a significant decrease in ME for males. The maintenance of ME in females co-occurs with increased aversive processing relative to males.

Experience of anxiety among patients with severe COPD: A qualitative, in-depth interview study

Anxiety often arises in conjunction with dyspnoea in patients with severe COPD. Considering the provoking symptomatology and the high mortality rate for COPD, it is reasonable to believe that these conditions trigger death-related and existential anxiety. Although anxiety causes considerable distress and reduces quality of life, people's experience of anxiety has been studied relatively little. The aim of this study was to explore severely ill COPD patients' experience of anxiety and their strategies to alleviate anxiety. This qualitative, in-depth interview study explored perceptions of anxiety and the alleviation strategies that are adopted. Interviews were analyzed using a thematic content analysis approach, involving interpretive coding and identification of themes. People suffering from COPD (stage III or IV) were recruited from a pulmonary outpatient clinic in the west of Sweden. Purposive sampling was used, and thirty-one (31) patients were included. Most of the patients had experienced anxiety associated with COPD. Analyses revealed three major themes, death anxiety, life anxiety, and counterweights to anxiety. Death anxiety included fear of suffocation, awareness of death, fear of dying and separation anxiety. Life anxiety included fear of living and fear of the future. Counterweights to anxiety concerned coping with suffocation, avoiding strategy, and a sense of joy that defied their vulnerable situation. The majority of patients experienced anxiety, which limited their lives. Although the patients experienced both life anxiety and death anxiety, they were able to cope with the situation and find a defiant joy to some extent.

Induction of dyspnea evokes increased anxiety and maladaptive breathing in individuals with high anxiety sensitivity and suffocation fear

Although respiratory symptoms are relevant for diagnosis and etiology of panic disorder, anxiety responses and breathing behavior evoked by induction of dyspnea have rarely been studied. Therefore, dyspnea sensations and affective evaluations evoked by inspiratory resistive loads of different intensities were first assessed in 23 individuals with high versus 24 participants with low anxiety sensitivity (AS). High AS participants with high fear of suffocation rated loads of the same physical intensity as more unpleasant and reported more intense feelings of dyspnea and more respiratory and panic symptoms than low AS individuals. In the second experiment assessing physiological responses to physically comparable loads, high suffocation fear participants showed an increase in minute ventilation to compensate for fear-induced air hunger. This ventilation behavior results in increased frequency of dyspnea sensations, thus increasing fear of suffocation.