Occupational rhinoconjunctivitis caused by the common indoor plant, Hoya compacta

BACKGROUND

Allergic reactions to the common house plant Hoya compacta (HC) have not previously been described.

AIMS

To confirm HC as the cause of rhinoconjunctivitis in three horticultural workers.

METHODS

Greenhouse working conditions were reproduced in our challenge chamber.

RESULTS

All three cases developed rhinoconjunctivitis when working with HC plants. A control challenge was performed in two cases with iceberg lettuce causing no symptoms. Nasal volume measured by acoustic rhinometry (AR) fell after all three active challenges, but also after one of the control challenges.

CONCLUSIONS

Our study confirms that HC may cause occupational rhinoconjunctivitis and asthma through a Type I hypersensitivity reaction. Specific inhalation challenges, nasal nitric oxide measurement and AR may be useful additional tools in supporting such diagnoses for occupational physicians to consider.

Effects of RYGB on energy expenditure, appetite and glycaemic control: a randomized controlled clinical trial

OBJECTIVES

Increased energy expenditure (EE) has been proposed as an important mechanism for weight loss following Roux-en-Y gastric bypass (RYGB). However, this has never been investigated in a controlled setting independent of changes in energy balance. Similarly, only few studies have investigated the effect of RYGB on glycaemic control per se. Here, we investigated the effect of RYGB on EE, appetite, glycaemic control and specific signalling molecules compared with a control group in comparable negative energy balance.

SUBJECTS/METHODS

Obese normal glucose-tolerant participants were randomized to receive RYGB after 8 (n=14) or 12 weeks (n=14). The protocol included a visit at week 0 and three visits (weeks 7, 11 and 78) where 24-h EE, appetite and blood parameters were assessed. Participants followed a low-calorie diet from weeks 0-11, with those operated at week 12 serving as a control group for those operated at week 8.

RESULTS

Compared with controls, RYGB-operated participants had lower body composition-adjusted 24-h EE and basal EE 3 weeks postoperatively (both P<0.05) but EE parameters at week 78 were not different from preoperative values (week 7). Surgery changed the postprandial response of glucagon-like peptide-1 (GLP-1), peptide YY3-36 (PYY), ghrelin, cholecystokinin, fibroblast growth factor-19 and bile acids (all P<0.05). Particularly, increases in GLP-1, PYY and decreases in ghrelin were associated with decreased appetite. None of HOMA-IR (homeostasis model assessment-estimated insulin resistance), Matsuda index, the insulinogenic index, the disposition index and fasting hepatic insulin clearance were different between the groups, but RYGB operated had lower fasting glucose (P<0.05) and the postprandial glucose profile was shifted to the left (P<0.01).

CONCLUSIONS

Our data do not support that EE is increased after RYGB. More likely, RYGB promotes weight loss by reducing appetite, partly mediated by changes in gastrointestinal hormone secretion. Furthermore, we found that the early changes in glycaemic control after RYGB is to a large extent mediated by caloric restriction.

Histological distinction between early allergic and irritant patch test reactions: follicular spongiosis may be characteristic of early allergic contact dermatitis

Comparative light microscopic studies have revealed subtle differences between allergic and irritant reactions in the skin. In the search for specific differences, we focussed on the early inflammatory response. This pilot study was conducted to test the hypothesis that follicular spongiosis can differentiate between early allergic and irritant patch test reactions. 8 patients with known contact allergy to either colophony or quarternium-15 participated in the study. In each patient, allergic and irritant patch tests reactions were elicited, and 4-mm punch biopsies were taken after 6 8 h from clinically equipotent reactions. Paired sets of slides were assessed blindly by 2 pathologists. 1 patient showing a pityrosporum folliculitis was excluded from the study. All biopsies from allergic patch tests were characterized by follicular spongiosis, while biopsies from irritant patch tests showed no recognizable changes except a slight follicular spongiosis in 1 patient. The 2 pathologists agreed independently on the correct classification in 6 out of 7 cases (p=0.0156). We tested an optimized model, selecting non-irritant allergens and a well-known irritant. Further investigations are needed to elucidate the diagnostic significance of the histological classification of allergic and irritant cutaneous reactions in punch biopsies.

[Contact allergy to local steroids. Contact allergy to corticosteroids among consecutively tested patients with eczema]

We studied the frequency of contact dermatitis to corticosteroids in consecutive eczema patients and the relevance of positive patch test reactions. Of 2,742 patients patch tested at the Dermatology Clinic at Odense University Hospital between June 1991 and December 1995, 65 patients (47 women and 18 men) or 2.4% had a positive reaction to one or more of the corticosteroids tested. Forty (1.45%) had a positive reaction to budesonide 1% pet. in the standard series. For a one-year period 662 consecutive eczema patients were routinely patch tested with a corticosteroid series consisting of five steroid allergens, and 17 had a positive reaction to at least one of these (2.6%). Budesonide allergy was most often encountered, followed by hydrocortisone, tixocortol pivalate and hydrocortisone-17-butyrate. Betamethasone valerate, triamcinolone acetonide and clobetasol propionate rarely caused contact allergy. The corticosteroid allergy was of current relevance in about one third of the cases. Corticosteroid contact allergy is an uncommon adverse effect, in relation to the number of patients with inflammatory skin diseases who are treated with topical corticosteroids. In patients with longstanding eczematous skin disease, who do not improve or deteriorate during topical corticosteroid therapy, contact allergy to these drugs should be suspected and relevant patch tests should be performed to sort out concomitant reactions. Future treatment with corticosteroids must take into account possible cross-reactions.

[Pulmonary edema after intravenous injection of eyedrops containing adrenaline]

A case of adrenaline overdose in a 27 year old male drug addict is reported. Following accidental injection of 20 mg adrenaline he developed pulmonary oedema and severe metabolic acidosis, which responded well to symptomatic treatment.

[Laparoscopic cholecystectomy]

Forty-one patients with uncomplicated gall stone disease were laparoscopied with the object of cholecystectomy. The procedure was accomplished in 36 patients, but the operation had to be transformed to a conventional open operation in five: Fibrosis made dissection of the gall bladder hazardous in four and bleeding during the procedure made immediate laparotomy necessary in one patient, whose postoperative course was uneventful. The median operating time was 100 minutes, range was 60-250 minutes. The only operative complication was bleeding from a trocar puncture hole on the first postoperative day which stopped spontaneously in one patient. Eighteen were sent home on the first postoperative day and 12 patients on the second day. Peroperative cholangiography was performed employing the Olsen-Reddick cholangiography forceps. We have designed a special catheter, which greatly facilitates the procedure. The procedure was accomplished in 27 of 32 planned cases. Two patients had common bile duct or common hepatic duct stones. A trans-sphincteric endoprosthesis was applied through the cholangiography forceps in both patients, to prevent postoperative bile duct outlet obstruction. The endoprosthesis made the following endoscopic sphincterotomy, which was performed at a convenient time rapid and safe. The stones were extracted and the prosthesis removed on the same occasion. A reliable flushing system was developed on the basis of the "Kidde" automatic tourniquet frequently used in orthopaedic surgery. All patients were seen in the outpatient clinic 1 month after the operation. Superficial infection in the trocar holes in ten patients were the only problem the patients had encountered and all had returned to their normal work.(ABSTRACT TRUNCATED AT 250 WORDS)

Cyclic AMP-and beta-agonist-activated chloride conductance of a toad skin epithelium

1. The control by intracellular cyclic AMP and beta-adrenergic stimulation of chloride conductance was studied in toad skin epithelium mounted in a chamber on the stage of an upright microscope. Impalement of identified principal cells from the serosal side with single-barrelled conventional or double-barrelled Cl(-)-sensitive microelectrodes was performed at x500 magnification. For blocking the active sodium current 50 microM-amiloride was present in the mucosal bath. 2. When clamped at transepithelial potential difference V = 0 mV, the preparations generated clamping currents of 0.9 +/- 1 microA/cm2 (mean +/- S.E.M.; number of observations n = 55). The intracellular potential of principal cells (Vb) was -96 +/- 2 mV with a fractional resistance of the basolateral membrane (fRb) of 0.016 +/- 0.003 (n = 54), and an intracellular Cl- activity of 40 +/- 2 mM (n = 24). 3. At V = 0 mV, serosal application of a cyclic AMP analogue, dibutyryl cyclic AMP (500 microM) or a beta-adrenergic agonist, isoprenaline (5 microM) resulted in a sixfold increase in transepithelial Cl- conductance identified by standard 36Cl- tracer technique. 4. The clamping current at V = 0 mV was unaffected by cyclic AMP (short-circuit current Isc = 0.1 +/- 0.3 microA/cm2, n = 16) indicating that subepidermal Cl(-)-secreting glands are not functioning in our preparations obtained by collagenase treatment. 5. Cyclic AMP- or isoprenaline-induced chloride conductance (Gcl) activation (V = 0 mV) was not reflected in membrane potential and intracellular Cl- activity in principal cells. Intracellular chloride activity was constant at approximately 40 mM at membrane potentials between -90 and -100 mV. Therefore, it can be concluded that the principal cells are not contributing to activated Cl- currents. 6. At V = -100 mV where the voltage-dependent chloride conductance of mitochondria-rich (MR) cells was already fully activated, GCl was unaffected by cyclic AMP or isoprenaline. The major effect of these treatments was a rightward displacement of the MR cell-generated GCl-V relationship along the V axis. 7. Our results indicate that the beta-adrenergically controlled cyclic AMP-mediated chloride conductance is localized to the mitochondria-rich cells.